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- W2066843563 abstract "Poly(γ-glutamic acid) (γ-PGA) is a natural, biodegradable polyamide that is mostly produced by glutamate-dependent microorganisms such as Bacillus licheniformis, Bacillus amyloliquefaciens and Bacillus subtilis. In this study, a γ-PGA-producing glutamate-independent strain, SK19.001, was screened and characterized as Bacillus methylotrophicus. The effects of various carbon and nitrogen sources on the γ-PGA productivity of this strain were investigated. Many carbon sources, such as sodium glutamate, glucose, glycerol, soluble starch, α-lactose, maltose, sucrose, citric acid and fructose, proved suitable for SK19.001 to synthesize γ-PGA with high molecular weight. Compared with the previously reported production from glutamate-independent strains, a high level of production of γ-PGA (33.84–35.34 g/L) was obtained when SK19.001 was grown in a medium containing 30 g/L glycerol, 15 g/L sodium citrate and 50 g/L peptone. The γ-PGA product showed an ultra-high molecular weight of over 10,000 kDa. The genome of B. methylotrophicus SK19.001 was sequenced and a comparative investigation revealed that the PgsB, PgsC, and PgsA protein sequences were almost identical between the glutamate-independent strains and less identical between the glutamate-independent and glutamate-dependent strains. This study is the first to demonstrate high levels of γ-PGA production using B. methylotrophicus. The results suggest a promising new approach for γ-PGA production." @default.
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- W2066843563 date "2015-03-01" @default.
- W2066843563 modified "2023-10-17" @default.
- W2066843563 title "High-level production of poly(γ-glutamic acid) by a newly isolated glutamate-independent strain, Bacillus methylotrophicus" @default.
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- W2066843563 doi "https://doi.org/10.1016/j.procbio.2014.12.024" @default.
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