Glutathione hydrolase 5 proenzyme
Definition:
Cleaves the gamma-glutamyl peptide bond of glutathione and glutathione-S-conjugate such as leukotriene C4. Does not cleaves gamma-glutamyl compounds such as gamma-glutamyl leucine. May also catalyze a transpeptidation reaction in addition to the hydrolysis reaction, transferring the gamma-glutamyl moiety to an acceptor amino acid to form a new gamma-glutamyl compound. Acts as a negative regulator of geranylgeranyl glutathione bioactivity by cleaving off its gamma-glutamyl group, playing a role in adaptive immune responses.
References:
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[1]. Erick Lu, et al. S-Geranylgeranyl-L-glutathione is a ligand for human B cell-confinement receptor P2RY8. Nature. 2019 Mar;567(7747):244-248. [Content Brief]
[2]. Stephanie Wickham, et al. Gamma-glutamyl compounds: substrate specificity of gamma-glutamyl transpeptidase enzymes. Anal Biochem. 2011 Jul 15;414(2):208-14. [Content Brief]
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