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Year: 2013  |  Volume: 12  |  Issue: 5  |  Page No.: 209 - 212

Poly-γ-glutamic Acid Biosynthesis by a Novel γ-glutamyltranspeptidase from Bacillus cereus

Mao Ye, Maocheng Deng and Yuanping Zhang    

Abstract: A novel γ-glutamyltranspeptidases (GGT) for the synthesis of poly-γ-glutamic acid (γ-PGA) is presented. Soil samples from the mangrove sediment were collected. One strain designated L-12 was identified whose cell extract could convert glutamine into γ-PGA. The 16S rDNA gene analysis of L-12 revealed its phylogenetic relatedness to Bacillus cereus. The GGT produced by L-12 was purified 20.3-fold. The optimum pH and temperature for γ-PGA synthesis by this GGT were 7.5 and 20°C, respectively. The results indicated that L-12 could be used as a novel bacterial GGT source for synthesizing γ-PGA production. To our knowledge, this is the first report for GGT to γ-PGA biosynthesis.

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