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  Subjects -> BIOLOGY (Total: 3193 journals)
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BIOTECHNOLOGY (244 journals)                  1 2 | Last

Showing 1 - 200 of 244 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
Advanced Biomedical Research     Open Access  
Advances in Bioscience and Biotechnology     Open Access   (Followers: 17)
Advances in Genetic Engineering & Biotechnology     Hybrid Journal   (Followers: 9)
Advances in Regenerative Medicine     Open Access   (Followers: 3)
African Journal of Biotechnology     Open Access   (Followers: 6)
Algal Research     Partially Free   (Followers: 11)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 69)
American Journal of Bioinformatics Research     Open Access   (Followers: 7)
American Journal of Polymer Science     Open Access   (Followers: 33)
Amylase     Open Access  
Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access  
Animal Biotechnology     Hybrid Journal   (Followers: 8)
Annales des Sciences Agronomiques     Full-text available via subscription  
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 45)
Applied Biosafety     Hybrid Journal  
Applied Food Biotechnology     Open Access   (Followers: 3)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 67)
Applied Mycology and Biotechnology     Full-text available via subscription   (Followers: 4)
Arthroplasty Today     Open Access   (Followers: 1)
Artificial Cells, Nanomedicine and Biotechnology     Hybrid Journal   (Followers: 1)
Asia Pacific Biotech News     Hybrid Journal   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Pacific Journal of Tropical Biomedicine     Open Access   (Followers: 2)
Australasian Biotechnology     Full-text available via subscription   (Followers: 1)
Banat's Journal of Biotechnology     Open Access  
BBR : Biochemistry and Biotechnology Reports     Open Access   (Followers: 5)
Beitr?ge zur Tabakforschung International/Contributions to Tobacco Research     Open Access   (Followers: 3)
Bio-Algorithms and Med-Systems     Hybrid Journal   (Followers: 2)
Bio-Research     Full-text available via subscription   (Followers: 4)
Bioactive Materials     Open Access   (Followers: 1)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 4)
Biocybernetics and Biological Engineering     Full-text available via subscription   (Followers: 5)
Bioethics UPdate     Hybrid Journal   (Followers: 1)
Biofuels     Hybrid Journal   (Followers: 11)
Biofuels Engineering     Open Access   (Followers: 1)
Biological & Pharmaceutical Bulletin     Full-text available via subscription   (Followers: 4)
Biological Cybernetics     Hybrid Journal   (Followers: 10)
Biomarkers and Genomic Medicine     Open Access   (Followers: 3)
Biomaterials Research     Open Access   (Followers: 4)
BioMed Research International     Open Access   (Followers: 4)
Biomédica     Open Access  
Biomedical and Biotechnology Research Journal     Open Access  
Biomedical Engineering Research     Open Access   (Followers: 6)
Biomedical Glasses     Open Access  
Biomedical Reports     Full-text available via subscription  
BioMedicine     Open Access  
Biomedika     Open Access  
Bioprinting     Hybrid Journal   (Followers: 1)
Bioresource Technology Reports     Hybrid Journal   (Followers: 1)
Bioscience, Biotechnology, and Biochemistry     Hybrid Journal   (Followers: 21)
Biosensors Journal     Open Access  
Biosimilars     Open Access   (Followers: 1)
Biosurface and Biotribology     Open Access  
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
BioTechniques : The International Journal of Life Science Methods     Full-text available via subscription   (Followers: 28)
Biotechnologia Acta     Open Access   (Followers: 1)
Biotechnologie, Agronomie, Société et Environnement     Open Access   (Followers: 2)
Biotechnology     Open Access   (Followers: 8)
Biotechnology & Biotechnological Equipment     Open Access   (Followers: 4)
Biotechnology Advances     Hybrid Journal   (Followers: 34)
Biotechnology and Applied Biochemistry     Hybrid Journal   (Followers: 44)
Biotechnology and Bioengineering     Hybrid Journal   (Followers: 159)
Biotechnology and Bioprocess Engineering     Hybrid Journal   (Followers: 6)
Biotechnology and Genetic Engineering Reviews     Hybrid Journal   (Followers: 13)
Biotechnology and Health Sciences     Open Access   (Followers: 1)
Biotechnology and Molecular Biology Reviews     Open Access   (Followers: 2)
Biotechnology Annual Review     Full-text available via subscription   (Followers: 5)
Biotechnology for Biofuels     Open Access   (Followers: 10)
Biotechnology Frontier     Open Access   (Followers: 2)
Biotechnology Journal     Hybrid Journal   (Followers: 17)
Biotechnology Law Report     Hybrid Journal   (Followers: 4)
Biotechnology Letters     Hybrid Journal   (Followers: 34)
Biotechnology Progress     Hybrid Journal   (Followers: 41)
Biotechnology Reports     Open Access  
Biotechnology Research International     Open Access   (Followers: 1)
Biotechnology Techniques     Hybrid Journal   (Followers: 10)
Biotecnología Aplicada     Open Access  
Bioteknologi (Biotechnological Studies)     Open Access  
BIOTIK : Jurnal Ilmiah Biologi Teknologi dan Kependidikan     Open Access  
Biotribology     Hybrid Journal   (Followers: 1)
BMC Biotechnology     Open Access   (Followers: 17)
Cell Biology and Development     Open Access  
Chinese Journal of Agricultural Biotechnology     Full-text available via subscription   (Followers: 4)
Communications in Mathematical Biology and Neuroscience     Open Access  
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computer Methods and Programs in Biomedicine     Hybrid Journal   (Followers: 8)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biotechnology     Hybrid Journal   (Followers: 20)
Crop Breeding and Applied Biotechnology     Open Access   (Followers: 3)
Current Bionanotechnology     Hybrid Journal  
Current Biotechnology     Hybrid Journal   (Followers: 4)
Current Opinion in Biomedical Engineering     Hybrid Journal   (Followers: 1)
Current Opinion in Biotechnology     Hybrid Journal   (Followers: 55)
Current Pharmaceutical Biotechnology     Hybrid Journal   (Followers: 9)
Current Research in Bioinformatics     Open Access   (Followers: 13)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Current trends in Biotechnology and Pharmacy     Open Access   (Followers: 8)
DNA and RNA Nanotechnology     Open Access  
EBioMedicine     Open Access  
Electronic Journal of Biotechnology     Open Access  
Entomologia Generalis     Full-text available via subscription   (Followers: 1)
Environmental Science : Processes & Impacts     Full-text available via subscription   (Followers: 4)
Experimental Biology and Medicine     Hybrid Journal   (Followers: 3)
Folia Medica Indonesiana     Open Access  
Food Bioscience     Hybrid Journal  
Food Biotechnology     Hybrid Journal   (Followers: 9)
Food Science and Biotechnology     Hybrid Journal   (Followers: 8)
Frontiers in Bioengineering and Biotechnology     Open Access   (Followers: 6)
Frontiers in Systems Biology     Open Access   (Followers: 2)
Fungal Biology and Biotechnology     Open Access   (Followers: 2)
GM Crops and Food: Biotechnology in Agriculture and the Food Chain     Full-text available via subscription   (Followers: 1)
GSTF Journal of BioSciences     Open Access  
HAYATI Journal of Biosciences     Open Access  
Horticultural Biotechnology Research     Open Access  
Horticulture, Environment, and Biotechnology     Hybrid Journal   (Followers: 11)
IEEE Transactions on Molecular, Biological and Multi-Scale Communications     Hybrid Journal   (Followers: 1)
IET Nanobiotechnology     Hybrid Journal   (Followers: 2)
IN VIVO     Full-text available via subscription   (Followers: 4)
Indian Journal of Biotechnology (IJBT)     Open Access   (Followers: 2)
Indonesia Journal of Biomedical Science     Open Access   (Followers: 2)
Indonesian Journal of Biotechnology     Open Access   (Followers: 1)
Indonesian Journal of Medicine     Open Access  
Industrial Biotechnology     Hybrid Journal   (Followers: 18)
International Biomechanics     Open Access  
International Journal of Bioinformatics Research and Applications     Hybrid Journal   (Followers: 14)
International Journal of Biomechatronics and Biomedical Robotics     Hybrid Journal   (Followers: 4)
International Journal of Biomedical Research     Open Access   (Followers: 2)
International Journal of Biotechnology     Hybrid Journal   (Followers: 5)
International Journal of Biotechnology and Molecular Biology Research     Open Access   (Followers: 4)
International Journal of Biotechnology for Wellness Industries     Partially Free   (Followers: 1)
International Journal of Environment, Agriculture and Biotechnology     Open Access   (Followers: 5)
International Journal of Functional Informatics and Personalised Medicine     Hybrid Journal   (Followers: 4)
International Journal of Medicine and Biomedical Research     Open Access   (Followers: 1)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 3)
International Journal of Radiation Biology     Hybrid Journal   (Followers: 4)
Iranian Journal of Biotechnology     Open Access  
ISABB Journal of Biotechnology and Bioinformatics     Open Access  
Italian Journal of Food Science     Open Access   (Followers: 1)
JMIR Biomedical Engineering     Open Access  
Journal of Biometrics & Biostatistics     Open Access   (Followers: 3)
Journal of Bioterrorism & Biodefense     Open Access   (Followers: 6)
Journal of Petroleum & Environmental Biotechnology     Open Access   (Followers: 1)
Journal of Advanced Therapies and Medical Innovation Sciences     Open Access  
Journal of Advances in Biotechnology     Open Access   (Followers: 5)
Journal Of Agrobiotechnology     Open Access  
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 7)
Journal of Animal Science and Biotechnology     Open Access   (Followers: 4)
Journal of Applied Biomedicine     Open Access   (Followers: 2)
Journal of Applied Biotechnology     Open Access   (Followers: 2)
Journal of Applied Biotechnology Reports     Open Access   (Followers: 2)
Journal of Applied Mathematics & Bioinformatics     Open Access   (Followers: 5)
Journal of Biologically Active Products from Nature     Hybrid Journal   (Followers: 1)
Journal of Biomaterials and Nanobiotechnology     Open Access   (Followers: 6)
Journal of Biomedical Photonics & Engineering     Open Access  
Journal of Biomedical Practitioners     Open Access  
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Bioprocessing & Biotechniques     Open Access  
Journal of BioScience and Biotechnology     Open Access  
Journal of Biosecurity Biosafety and Biodefense Law     Hybrid Journal   (Followers: 3)
Journal of Biotechnology     Hybrid Journal   (Followers: 63)
Journal of Biotechnology and Strategic Health Research     Open Access   (Followers: 1)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 9)
Journal of Chitin and Chitosan Science     Full-text available via subscription   (Followers: 1)
Journal of Colloid Science and Biotechnology     Full-text available via subscription  
Journal of Commercial Biotechnology     Full-text available via subscription   (Followers: 6)
Journal of Crop Science and Biotechnology     Hybrid Journal   (Followers: 3)
Journal of Ecobiotechnology     Open Access  
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Experimental Biology     Full-text available via subscription   (Followers: 25)
Journal of Genetic Engineering and Biotechnology     Open Access   (Followers: 5)
Journal of Ginseng Research     Open Access  
Journal of Industrial Microbiology and Biotechnology     Hybrid Journal   (Followers: 18)
Journal of Integrative Bioinformatics     Open Access  
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Molecular Biology and Biotechnology     Open Access  
Journal of Molecular Microbiology and Biotechnology     Full-text available via subscription   (Followers: 13)
Journal of Nano Education     Full-text available via subscription  
Journal of Nanobiotechnology     Open Access   (Followers: 4)
Journal of Nanofluids     Full-text available via subscription   (Followers: 1)
Journal of Organic and Biomolecular Simulations     Open Access  
Journal of Plant Biochemistry and Biotechnology     Hybrid Journal   (Followers: 4)
Journal of Science and Applications : Biomedicine     Open Access  
Journal of the Mechanical Behavior of Biomedical Materials     Hybrid Journal   (Followers: 13)
Journal of Trace Elements in Medicine and Biology     Hybrid Journal   (Followers: 1)
Journal of Tropical Microbiology and Biotechnology     Full-text available via subscription  
Journal of Yeast and Fungal Research     Open Access   (Followers: 1)
Marine Biotechnology     Hybrid Journal   (Followers: 4)
Meat Technology     Open Access  
Messenger     Full-text available via subscription  
Metabolic Engineering Communications     Open Access   (Followers: 4)
Metalloproteinases In Medicine     Open Access  
Microbial Biotechnology     Open Access   (Followers: 10)
MicroMedicine     Open Access   (Followers: 3)
Molecular and Cellular Biomedical Sciences     Open Access   (Followers: 1)
Molecular Biotechnology     Hybrid Journal   (Followers: 13)
Molecular Genetics and Metabolism Reports     Open Access   (Followers: 3)
Nanobiomedicine     Open Access  
Nanobiotechnology     Hybrid Journal   (Followers: 2)

        1 2 | Last

Journal Cover
Journal of Industrial Microbiology and Biotechnology
Journal Prestige (SJR): 1.107
Citation Impact (citeScore): 3
Number of Followers: 18  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1476-5535 - ISSN (Online) 1367-5435
Published by Springer-Verlag Homepage  [2352 journals]
  • Dynamic kinetic resolution of Vince lactam catalyzed by γ-lactamases:
           a mini-review
    • Authors: Shaozhou Zhu; Guojun Zheng
      Pages: 1017 - 1031
      Abstract: γ-Lactamases are versatile enzymes used for enzymatic kinetic resolution of racemic Vince lactam (2-azabicyclo[2.2.1]hept-5-en-3-one) in the industry. Optically pure enantiomers and their hydrolytic products are widely employed as key chemical intermediates for developing a wide range of carbocyclic nucleoside medicines, including US FDA-approved drugs peramivir and abacavir. Owing to the broad applications in the healthcare industry, the resolution process of Vince lactam has witnessed tremendous progress during the past decades. Some of the most important advances are the enzymatic strategies involving γ-lactamases. The strong industrial demand drives the progress in various strategies for discovering novel biocatalysts. In the past few years, several new scientific breakthroughs, including the genome-mining strategy and elucidation of several crystal structures, boosted the research on γ-lactamases. So far, several families of γ-lactamases for resolution of Vince lactam have been discovered, and their number is continuously increasing. The purpose of this mini-review is to describe the discovery strategy and classification of these intriguing enzymes and to cover our current knowledge on their potential biological functions. Moreover, structural properties are described in addition to their possible catalytic mechanisms. Additionally, recent advances in the newest approaches, such as immobilization to increase stability, and other engineering efforts are introduced.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2093-6
      Issue No: Vol. 45, No. 12 (2018)
       
  • Insight into the surfactin production of Bacillus velezensis B006 through
           metabolomics analysis
    • Authors: Junqiang Wang; Rongjun Guo; Wenchao Wang; Guizhen Ma; Shidong Li
      Pages: 1033 - 1044
      Abstract: Bacillus velezensis B006 is a biocontrol agent which functions through effective colonization and surfactin production. To reveal the surfactin-producing mechanism, gas chromatography–mass spectrometry based untargeted metabolomics was performed to compare the metabolite profiles of strain B006 grown in industrial media M3 and M4. Based on the statistical and pathway topology analyses, a total of 31 metabolites with a fold change of less than − 1.0 were screened as the significantly altered metabolites, which distributed in 15 metabolic pathways. Fourteen amino acids involving in the metabolisms of alanine/aspartate/glutamate, glycine/serine/threonine, arginine/proline, glutathione/cysteine/methionine and valine/leucine/isoleucine as well as succinic acid in TCA cycle were identified to be the hub metabolites. Aminoacyl-tRNA biosynthesis, glycerolipid metabolism, and pantothenate/CoA biosynthesis also contributed to surfactin production. To the best of our knowledge, this study is the first to investigate the metabolic pathways of B. velezensis on surfactin production, and will benefit the optimization of commercial fermentation for higher surfactin yield.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2076-7
      Issue No: Vol. 45, No. 12 (2018)
       
  • Enhanced microbial lipid production by Cryptococcus albidus in
           the high-cell-density continuous cultivation with membrane cell recycling
           and two-stage nutrient limitation
    • Authors: Rongzhan Fu; Qiang Fei; Longan Shang; Christopher J. Brigham; Ho Nam Chang
      Pages: 1045 - 1051
      Abstract: As a potential feedstock for biofuel production, a high-cell-density continuous culture for the lipid production by Cryptococcus albidus was investigated in this study. The influences of dilution rates in the single-stage continuous cultures were explored first. To reach a high-cell-density culture, a single-stage continuous culture coupled with a membrane cell recycling system was carried out at a constant dilution rate of 0.36/h with varied bleeding ratios. The maximum lipid productivity of 0.69 g/L/h was achieved with the highest bleeding ratio of 0.4. To reach a better lipid yield and content, a two-stage continuous cultivation was performed by adjusting the C/N ratio in two different stages. Finally, a lipid yield of 0.32 g/g and lipid content of 56.4% were obtained. This two-stage continuous cultivation, which provided a higher lipid production performance, shows a great potential for an industrial-scale biotechnological production of microbial lipids and biofuel production.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2081-x
      Issue No: Vol. 45, No. 12 (2018)
       
  • Media studies to enhance the production of verticillins facilitated by in
           situ chemical analysis
    • Authors: Chiraz Soumia M. Amrine; Huzefa A. Raja; Blaise A. Darveaux; Cedric J. Pearce; Nicholas H. Oberlies
      Pages: 1053 - 1065
      Abstract: Verticillins are a group of epipolythiodioxopiperazine alkaloids that have displayed potent cytotoxicity. To evaluate their potential further, a larger supply of these compounds was needed for both in vivo studies and analogue development via semisynthesis. To optimize the biosynthesis of these secondary metabolites, their production was analyzed in two different fungal strains (MSX59553 and MSX79542) under a suite of fermentation conditions. These studies were facilitated by the use of the droplet-liquid microjunction-surface sampling probe (droplet probe), which enables chemical analysis in situ directly from the surface of the cultures. These experiments showed that the production of verticillins was greatly affected by growth conditions; a significantly higher quantity of these alkaloids was noted when the fungal strains were grown on an oatmeal-based medium. Using these technologies to select the best among the tested growth conditions, the production of the verticillin analogues was increased while concomitantly decreasing the time required for fermentations from 5 weeks to about 11 days. Importantly, where we could previously supply 5–10 mg every 6 weeks, we are now able to supply 50–150 mg quantities of key analogues per month via laboratory scale fermentation. Graphical abstract
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2083-8
      Issue No: Vol. 45, No. 12 (2018)
       
  • A comprehensive catalogue of polyketide synthase gene clusters in
           lichenizing fungi
    • Authors: Robert L. Bertrand; John L. Sorensen
      Pages: 1067 - 1081
      Abstract: Lichens are fungi that form symbiotic partnerships with algae. Although lichens produce diverse polyketides, difficulties in establishing and maintaining lichen cultures have prohibited detailed studies of their biosynthetic pathways. Creative, albeit non-definitive, methods have been developed to assign function to biosynthetic gene clusters in lieu of techniques such as gene knockout and heterologous expressions that are commonly applied to easily cultivatable organisms. We review a total of 81 completely sequenced polyketide synthase (PKS) genes from lichenizing fungi, comprising to our best efforts all complete and reported PKS genes in lichenizing fungi to date. This review provides an overview of the approaches used to locate and sequence PKS genes in lichen genomes, current approaches to assign function to lichen PKS gene clusters, and what polyketides are proposed to be biosynthesized by these PKS. We conclude with remarks on prospects for genomics-based natural products discovery in lichens. We hope that this review will serve as a guide to ongoing research efforts on polyketide biosynthesis in lichenizing fungi.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2080-y
      Issue No: Vol. 45, No. 12 (2018)
       
  • Streptomyces albulus yields ε-poly- l -lysine and other products from
           salt-contaminated glycerol waste
    • Authors: Amanda Dodd; Dirk Swanevelder; Nerve Zhou; Dean Brady; John E. Hallsworth; Karl Rumbold
      Pages: 1083 - 1090
      Abstract: Actinomycetes are the most important microorganisms for the industrial production of secondary metabolites with antimicrobial and anticancer properties. However, they have not been implicated in biorefineries. Here, we study the ability of the ε-poly-l-lysine producing Streptomyces albulus BCRC 11814 to utilize biodiesel-derived crude glycerol. S. albulus was cultured in a mineral medium supplemented with up to 10% w/v sodium chloride or potassium chloride, and with crude glycerol as the sole carbohydrate source. Under these conditions, the strain produced 0.1 g ε-poly-l-lysine per 1 g of biomass. RNA sequencing revealed upregulation of the ectoine biosynthetic pathway of S. albulus, which provides proof of halotolerance. S. albulus has several silent secondary metabolite biosynthetic clusters predicted within the genome. Based on the results, we conclude that S. albulus BCRC 11814 is a halotolerant microorganism capable of utilizing biodiesel-derived crude glycerol better than other actinomycetes included in the present study. S. albulus has the potential to be established as microbial platform production host for a range of high-value biological products.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2082-9
      Issue No: Vol. 45, No. 12 (2018)
       
  • Improved acid-stress tolerance of Lactococcus lactis NZ9000 and
           Escherichia coli BL21 by overexpression of the anti-acid component recT
    • Authors: Zhengming Zhu; Xiaomei Ji; Zhimeng Wu; Juan Zhang; Guocheng Du
      Pages: 1091 - 1101
      Abstract: Acid accumulation caused by carbon metabolism severely affects the fermentation performance of microbial cells. Here, different sources of the recT gene involved in homologous recombination were functionally overexpressed in Lactococcus lactis NZ9000 and Escherichia coli BL21, and their acid-stress tolerances were investigated. Our results showed that L. lactis NZ9000 (ERecT and LRecT) strains showed 1.4- and 10.4-fold higher survival rates against lactic acid (pH 4.0), respectively, and that E. coli BL21 (ERecT) showed 16.7- and 9.4-fold higher survival rates than the control strain against lactic acid (pH 3.8) for 40 and 60 min, respectively. Additionally, we found that recT overexpression in L. lactis NZ9000 improved their growth under acid-stress conditions, as well as increased salt- and ethanol-stress tolerance and intracellular ATP concentrations in L. lactis NZ9000. These findings demonstrated the efficacy of recT overexpression for enhancing acid-stress tolerance and provided a promising strategy for insertion of anti-acid components in different hosts.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2075-8
      Issue No: Vol. 45, No. 12 (2018)
       
  • Diacetyl control during brewery fermentation via adaptive laboratory
           engineering of the lager yeast Saccharomyces pastorianus
    • Authors: Brian Gibson; Virve Vidgren; Gopal Peddinti; Kristoffer Krogerus
      Pages: 1103 - 1112
      Abstract: Diacetyl contributes to the flavor profile of many fermented products. Its typical buttery flavor is considered as an off flavor in lager-style beers, and its removal has a major impact on time and energy expenditure in breweries. Here, we investigated the possibility of lowering beer diacetyl levels through evolutionary engineering of lager yeast for altered synthesis of α-acetolactate, the precursor of diacetyl. Cells were exposed repeatedly to a sub-lethal level of chlorsulfuron, which inhibits the acetohydroxy acid synthase responsible for α-acetolactate production. Initial screening of 7 adapted isolates showed a lower level of diacetyl during wort fermentation and no apparent negative influence on fermentation rate or alcohol yield. Pilot-scale fermentation was carried out with one isolate and results confirmed the positive effect of chlorsulfuron adaptation. Diacetyl levels were over 60% lower at the end of primary fermentation relative to the non-adapted lager yeast and no significant change in fermentation performance or volatile flavor profile was observed due to the adaptation. Whole-genome sequencing revealed a non-synonymous SNP in the ILV2 gene of the adapted isolate. This mutation is known to confer general tolerance to sulfonylurea compounds, and is the most likely cause of the improved tolerance. Adaptive laboratory evolution appears to be a natural, simple and cost-effective strategy for diacetyl control in brewing.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2087-4
      Issue No: Vol. 45, No. 12 (2018)
       
  • Nitrate boosts anaerobic ethanol production in an acetate-dependent manner
           in the yeast Dekkera bruxellensis
    • Authors: Irina Charlot Peña-Moreno; Denise Castro Parente; Jackeline Maria da Silva; Allyson Andrade Mendonça; Lino Angel Valcarcel Rojas; Marcos Antonio de Morais Junior; Will de Barros Pita
      Abstract: In the past few years, the yeast Dekkera bruxellensis has gained much of attention among the so-called non-conventional yeasts for its potential in the biotechnological scenario, especially in fermentative processes. This yeast has been regarded as an important competitor to Saccharomyces cerevisiae in bioethanol production plants in Brazil and several studies have reported its capacity to produce ethanol. However, our current knowledge concerning D. bruxellensis is restricted to its aerobic metabolism, most likely because wine and beer strains cannot grow in full anaerobiosis. Hence, the present work aimed to fulfil a gap regarding the lack of information on the physiology of Dekkera bruxellensis growing in the complete absence of oxygen and the relationship with assimilation of nitrate as nitrogen source. The ethanol strain GDB 248 was fully capable of growing anaerobically and produces ethanol at the same level of S. cerevisiae. The presence of nitrate in the medium increased this capacity. Moreover, nitrate is consumed faster than ammonium and this increased rate coincided with a higher speed of glucose consumption. The profile of gene expression helped us to figure out that even in anaerobiosis, the presence of nitrate drives the yeast cells to an oxidative metabolism that ultimately incremented both biomass and ethanol production. These results finally provide the clues to explain most of the success of this yeast in industrial processes of ethanol production.
      PubDate: 2018-12-11
      DOI: 10.1007/s10295-018-2118-1
       
  • Modification of isoprene synthesis to enable production of
           curcurbitadienol synthesis in Saccharomyces cerevisiae
    • Authors: Jing Qiao; Zuliang Luo; Shengrong Cui; Huan Zhao; Qi Tang; Changming Mo; Xiaojun Ma; Zimian Ding
      Abstract: Cucurbitane-type triterpenoids such as mogrosides and cucurbitacins that are present in the plants of Cucurbitaceae are widely used in Asian traditional medicine. Cucurbitadienol is the skeleton of cucurbitane-type triterpenoids. As an alternative production strategy, we developed baker’s yeast Saccharomyces cerevisiae as a microbial host for the eventual transformation of cucurbitadienol. The synthetic pathway of cucurbitadienol was constructed in Saccharomyces cerevisiae by introducing the cucurbitadienol synthase gene from different plants, resulting in 7.80 mg cucurbitadienol from 1 L of fermentation broth. Improving supplies of isoprenoid precursors was then investigated for increasing cucurbitadienol production. Cucurbitadienol production increased to 21.47 mg/L through the overexpression of a global regulatory factor (UPC2) gene of triterpenoid synthase. In addition, knockout of the ERG7 gene increased cucurbitadienol production from 21.47 to 61.80 mg/L. Finally, fed-batch fermentation was performed, and 63.00 mg/L cucurbitadienol was produced. This work is an important step towards the total biosynthesis of valuable cucurbitane-type triterpenoids and demonstrates the potential for developing a sustainable and secure yeast biomanufacturing platform for triterpenoids.
      PubDate: 2018-12-10
      DOI: 10.1007/s10295-018-2116-3
       
  • Genome mining reveals uncommon alkylpyrones as type III PKS products from
           myxobacteria
    • Authors: Joachim J. Hug; Fabian Panter; Daniel Krug; Rolf Müller
      Abstract: Type III polyketide synthases (PKSs) are comparatively small homodimeric enzymes affording natural products with diverse structures and functions. While type III PKS biosynthetic pathways have been studied thoroughly in plants, their counterparts from bacteria and fungi are to date scarcely characterized. This gap is exemplified by myxobacteria from which no type III PKS-derived small molecule has previously been isolated. In this study, we conducted a genomic survey of myxobacterial type III PKSs and report the identification of uncommon alkylpyrones as the products of type III PKS biosynthesis from the myxobacterial model strain Myxococcus xanthus DK1622 through a self-resistance-guided screening approach focusing on genes encoding pentapetide repeat proteins, proficient to confer resistance to topoisomerase inhibitors. Using promoter-induced gene expression in the native host as well as heterologous expression of biosynthetic type III PKS genes, sufficient amounts of material could be obtained for structural elucidation and bioactivity testing, revealing potent topoisomerase activity in vitro.
      PubDate: 2018-12-01
      DOI: 10.1007/s10295-018-2105-6
       
  • Activation of silent biosynthetic pathways and discovery of novel
           secondary metabolites in actinomycetes by co-culture with mycolic
           acid-containing bacteria
    • Authors: Shotaro Hoshino; Hiroyasu Onaka; Ikuro Abe
      Abstract: Bacterial secondary metabolites (SM) are rich sources of drug leads, and in particular, numerous metabolites have been isolated from actinomycetes. It was revealed by recent genome sequence projects that actinomycetes harbor much more secondary metabolite-biosynthetic gene clusters (SM-BGCs) than previously expected. Nevertheless, large parts of SM-BGCs in actinomycetes are dormant and cryptic under the standard culture conditions. Therefore, a widely applicable methodology for cryptic SM-BGC activation is required to obtain novel SM. Recently, it was discovered that co-culturing with mycolic-acid-containing bacteria (MACB) widely activated cryptic SM-BGCs in actinomycetes. This “combined-culture” methodology (co-culture methodology using MACB as the partner of actinomycetes) is easily applicable for a broad range of actinomycetes, and indeed, 33 novel SM have been successfully obtained from 12 actinomycetes so far. In this review, the development, application, and mechanistic analysis of the combined-culture method were summarized.
      PubDate: 2018-11-28
      DOI: 10.1007/s10295-018-2100-y
       
  • Improvement of thermotolerance in Lachancea thermotolerans using a
           bacterial selection pressure
    • Authors: Nerve Zhou; Olena P. Ishchuk; Wolfgang Knecht; Concetta Compagno; Jure Piškur
      Abstract: The use of thermotolerant yeast strains is an important attribute for a cost-effective high temperature biofermentation processes. However, the availability of thermotolerant yeast strains remains a major challenge. Isolation of temperature resistant strains from extreme environments or the improvements of current strains are two major strategies known to date. We hypothesised that bacteria are potential “hurdles” in the life cycle of yeasts, which could influence the evolution of extreme phenotypes, such as thermotolerance. We subjected a wild-type yeast, Lachancea thermotolerans to six species of bacteria sequentially for several generations. After coevolution, we observed that three replicate lines of yeasts grown in the presence of bacteria grew up to 37 °C whereas the controls run in parallel without bacteria could only grow poorly at 35 °C retaining the ancestral mesophilic trait. In addition to improvement of thermotolerance, our results show that the fermentative ability was also elevated, making the strains more ideal for the alcoholic fermentation process because the overall productivity and ethanol titers per unit volume of substrate consumed during the fermentation process was increased. Our unique method is attractive for the development of thermotolerant strains or to augment the available strain development approaches for high temperature industrial biofermentation.
      PubDate: 2018-11-28
      DOI: 10.1007/s10295-018-2107-4
       
  • Discovery of caerulomycin/collismycin-type 2,2′-bipyridine natural
           products in the genomic era
    • Authors: Dandan Chen; Qunfei Zhao; Wen Liu
      Abstract: 2,2′-Bipyridine (2,2′-BP) is the unique molecular scaffold of the bioactive natural products represented by caerulomycins (CAEs) and collismycins (COLs). CAEs and COLs are highly similar in the chemical structures in which their 2,2′-BP cores typically contain a di- or tri-substituted ring A and an unmodified ring B. Here, we summarize the CAE and COL-type 2,2′-BP natural products known or hypothesized to date: (1) isolated using methods traditional for natural product characterization, (2) created by engineering the biosynthetic pathways of CAEs or COLs, and (3) predicted upon bioinformatics-guided genome mining. The identification of these CAE and COL-type 2,2′-BP natural products not only demonstrates the development of research techniques and methods in the field of natural product chemistry but also reflects the general interest in the discovery of CAE and COL-type 2,2′-BP natural products.
      PubDate: 2018-11-27
      DOI: 10.1007/s10295-018-2092-7
       
  • Systematic investigation of CRISPR–Cas9 configurations for flexible and
           efficient genome editing in Corynebacterium glutamicum NRRL-B11474
    • Authors: R. Cameron Coates; Stephen Blaskowski; Shawn Szyjka; Harmen M. van Rossum; Jim Vallandingham; Kedar Patel; Zach Serber; Jed Dean
      Abstract: This study details a reliable and efficient method for CRISPR–Cas9 genome engineering in the high amino acid-producing strain of Corynebacterium glutamicum, NRRL-B11474. Our investigation demonstrates that a plasmid-encoded single-guide RNA paired with different edit-encoding fragments is sufficient to generate edits without the addition of an exogenous recombinase. This approach leverages a genome-integrated copy of the cas9 gene for reduced toxicity, in combination with a single plasmid carrying the targeting guide RNA and matching edit fragment. Our study systematically investigated the impact of homology arm length on editing efficiency and demonstrates genome editing with homology arm lengths as small as 25 bp for single-nucleotide polymorphisms and 75 bp for 100 bp sequence swaps. These homology arm lengths are smaller than previously reported for other strains of C. glutamicum. Our study finds that C. glutamicum NRRL-B11474 is not amenable to efficient transformation with plasmids containing the BL1, NG2, or CC1 origins of replication. This finding differs from all previously reported approaches to plasmid-based CRISPR–Cas9 or Cpf1 editing in other strains of C. glutamicum. Two alternative origins of replication (CG1 and CASE1) can be used to successfully introduce genome edits; furthermore, our data demonstrate improved editing efficiency when guide RNAs and edit fragments are encoded on plasmids carrying the CASE1 origin of replication (compared to plasmids carrying CG1). In addition, this study demonstrates that efficient editing can be done using an integrated Cas9 without the need for a recombinase. We demonstrate that the specifics of CRISPR–Cas9 editing configurations may need to be tailored to enable different edit types in a particular strain background. Refining configuration parameters such as edit type, homology arm length, and plasmid origin of replication enables robust, flexible, and efficient CRISPR–Cas9 editing in differing genetic strain contexts.
      PubDate: 2018-11-27
      DOI: 10.1007/s10295-018-2112-7
       
  • Natural product drug discovery in the genomic era: realities, conjectures,
           misconceptions, and opportunities
    • Authors: Richard H. Baltz
      Abstract: Natural product discovery from microorganisms provided important sources for antibiotics, anti-cancer agents, immune-modulators, anthelminthic agents, and insecticides during a span of 50 years starting in the 1940s, then became less productive because of rediscovery issues, low throughput, and lack of relevant new technologies to unveil less abundant or not easily detected drug-like natural products. In the early 2000s, it was observed from genome sequencing that Streptomyces species encode about ten times as many secondary metabolites as predicted from known secondary metabolomes. This gave rise to a new discovery approach—microbial genome mining. As the cost of genome sequencing dropped, the numbers of sequenced bacteria, fungi and archaea expanded dramatically, and bioinformatic methods were developed to rapidly scan whole genomes for the numbers, types, and novelty of secondary metabolite biosynthetic gene clusters. This methodology enabled the identification of microbial taxa gifted for the biosynthesis of drug-like secondary metabolites. As genome sequencing technology progressed, the realities relevant to drug discovery have emerged, the conjectures and misconceptions have been clarified, and opportunities to reinvigorate microbial drug discovery have crystallized. This perspective addresses these critical issues for drug discovery.
      PubDate: 2018-11-27
      DOI: 10.1007/s10295-018-2115-4
       
  • CylA is a sequence-specific protease involved in toxin biosynthesis
    • Authors: Weixin Tang; Silvia C. Bobeica; Li Wang; Wilfred A. van der Donk
      Abstract: CylA is a subtilisin-like protein belonging to a recently expanded serine protease family related to class II lanthipeptide biosynthesis. As a leader peptidase, CylA is responsible for maturation of the enterococcal cytolysin, a lantibiotic important for Enterococcus faecalis virulence. In vitro reconstitution of CylA reveals that it accepts both linear and modified cytolysin peptides with a preference for cyclized peptides. Further characterization indicates that CylA activates itself by removing its N-terminal 95 amino acids. CylA achieves sequence-specific traceless cleavage of non-cognate peptides even if they are post-translationally modified, which makes the peptidase a powerful tool for mining novel lanthipeptides by providing a general strategy for leader peptide removal. Knowledge about the substrate specificity of CylA may also facilitate the development of protease inhibitors targeting cytolysin biosynthesis as a potential therapeutic approach for enterococcal infections.
      PubDate: 2018-11-27
      DOI: 10.1007/s10295-018-2110-9
       
  • A3 foresight network on natural products
    • Authors: Linquan Bai; Yasuo Ohnishi; Eung-Soo Kim
      Abstract: Discovery and development of natural products (NPs) have played important roles in the fields of human medicine and other biotechnology fields for the past several decades. Recent genome-mining approaches for the isolation of novel and cryptic NP biosynthetic gene clusters (BGCs) have led to the growing interest in NP research communities including Asian NP researchers from China, Japan, and Korea. Recently, a three-nation government-sponsored program named ‘A3 Foresight Network on Chemical and Synthetic Biology of NPs’ has been launched with a goal of establishing an Asian hub for NP research-&-personnel exchange program. This brief commentary describes introduction, main researchers, and future perspective of A3 NP network program.
      PubDate: 2018-11-24
      DOI: 10.1007/s10295-018-2111-8
       
  • Multiple-step chromosomal integration of divided segments from a large DNA
           fragment via CRISPR/Cas9 in Escherichia coli
    • Authors: Yanjun Li; Fangqing Yan; Heyun Wu; Guoliang Li; Yakun Han; Qian Ma; Xiaoguang Fan; Chenglin Zhang; Qingyang Xu; Xixian Xie; Ning Chen
      Abstract: Although CRISPR/Cas9-mediated gene editing technology has developed vastly in Escherichia coli, the chromosomal integration of large DNA fragment is still challenging compared with gene deletion and small fragment integration. Moreover, to guarantee sufficient Cas9-induced double-strand breaks, it is usually necessary to design several gRNAs to select the appropriate one. Accordingly, we established a practical daily routine in the laboratory work, involving multiple-step chromosomal integration of the divided segments from a large DNA fragment. First, we introduced and optimized the protospacers from Streptococcus pyogenes in E. coli W3110. Next, the appropriate fragment size for each round of integration was optimized to be within 3–4 kb. Taking advantage of the optimized protospacer/gRNA pairs, a DNA fragment with a total size of 15.4 kb, containing several key genes for uridine biosynthesis, was integrated into W3110 chromosome, which produced 5.6 g/L uridine in shake flask fermentation. Using this strategy, DNA fragments of virtually any length can be integrated into a suitable genomic site, and two gRNAs can be alternatively used, avoiding the tedious construction of gRNA-expressing plasmids. This study thus presents a useful strategy for large DNA fragment integration into the E. coli chromosome, which can be easily adapted for use in other bacteria.
      PubDate: 2018-11-23
      DOI: 10.1007/s10295-018-2114-5
       
  • Discovery, properties, and biosynthesis of pseudouridimycin, an
           antibacterial nucleoside-analog inhibitor of bacterial RNA polymerase
    • Authors: Sonia I. Maffioli; Margherita Sosio; Richard H. Ebright; Stefano Donadio
      Abstract: Pseudouridimycin (PUM) is a novel pseudouridine-containing peptidyl-nucleoside antibiotic that inhibits bacterial RNA polymerase (RNAP) through a binding site and mechanism different from those of clinically approved RNAP inhibitors of the rifamycin and lipiarmycin (fidaxomicin) classes. PUM was discovered by screening microbial fermentation extracts for RNAP inhibitors. In this review, we describe the discovery and characterization of PUM. We also describe the RNAP-inhibitory and antibacterial properties of PUM. Finally, we review available information on the gene cluster and pathway for PUM biosynthesis and on the potential for discovering additional novel pseudouridine-containing nucleoside antibiotics by searching bacterial genome and metagenome sequences for sequences similar to pumJ, the pseudouridine-synthase gene of the PUM biosynthesis gene cluster.
      PubDate: 2018-11-21
      DOI: 10.1007/s10295-018-2109-2
       
 
 
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