Biodegradation mechanism of poly amino acid

27 Proposed mechanisms of nylon degradation by peroxidase (adapted 

Poly(7-glutamic acid) (7-PGA) is a homopolymer consisting of glutamic acid with 7-linkages (Fig. 14.20). 7-PGA is microbially synthesized by various Bacillus strains (Ivanovics and Erdos, 1937) and is now industrially available. The microbial 7-PGA is generally a copolymer of two enantiomers of L- and D-glutamic acids, but pure 7-L-PGA and 7-D-PGA are also found. Relatively few examples have been reported for the biosynthesis of a-linked a-PGA. 

Biodegradable polymers for industrial applications Hydrolysis by PAsp hydrolase-1 

22 A proposed mechanism on the enzymatic hydrolysis of PAsp by PAsp hydrolase-1 and PAsp hydrolase-2 in the cell of Sphingomonas sp. KT-1 (adapted from Hiraishi etal., 2004). 

---