Reaction: 4-(L-γ-glutamylamino)butanoate + H2O = 4-aminobutanoate + L-glutamate
Glossary: 4-aminobutanoate = γ-aminobutyrate = GABA
Other name(s): γ-glutamyl-GABA hydrolase; PuuD; YcjL; 4-(γ-glutamylamino)butanoate amidohydrolase
Systematic name: 4-(L-γ-glutamylamino)butanoate amidohydrolase
Comments: Forms part of a putrescine-utilizing pathway in Escherichia coli, in which it has been hypothesized that putrescine is first glutamylated to form γ-glutamylputrescine, which is oxidized to 4-(γ-glutamylamino)butanal and then to 4-(γ-glutamylamino)butanoate. The enzyme can also catalyse the reactions of EC 188.8.131.52 (D-glutaminase) and EC 184.108.40.206 (theanine hydrolase).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Kurihara, S., Oda, S., Kato, K., Kim, H.G., Koyanagi, T., Kumagai, H. and Suzuki, H. A novel putrescine utilization pathway involves γ-glutamylated intermediates of Escherichia coli K-12. J. Biol. Chem. 280 (2005) 4602-4608. [PMID: 15590624]