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M. Ashiuchi, K. Soda, H. Misono (1999)
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Glutamic acid BCEOC (BCEOC)2 70 80 min Fig. 3. Chromatogram for hydrolysate of γ PGA derivated with BCEOC
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Bacillus licheniformis WBL-3, one of poly-γ-glutamic acid (γ-PGA) producers, depends on the existence of glutamate in the medium. In this paper, γ-PGA synthetase complex gene (pgsBCA) was cloned from Bacillus licheniformis WBL-3. pgsBCA gene of B. licheniformis WBL-3 was highly homologous with pgs-BCA gene of B. licheniformis 14580. The similarity was 97%, but the similarity of pgsBCA gene between B. licheniformis WBL-3 and Bacillus subtilis IFO3336 was only 74%. However, when pgsBCA was expressed in Escherichia coli, the E. coli clone produced γ-PGA extracellularly. The yield of γ-PGA was 8.624 g/l. This result infers that B. licheniformis and B. subtilis has the similar γ-PGA biosynthesis mechanism, namely, glutamic acid is catalyzed by an ATP-dependent amide ligase to synthesize γ-PGA.
Applied Biochemistry and Microbiology – Springer Journals
Published: Jul 5, 2011
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