This entry represents a domain of the type II secretion system protein GspA from E. coli, which has a papain-like fold similar to that in peptidase C39 family [1,2].

1: Structure of a periplasmic domain of the EpsAB fusion protein of the Vibrio vulnificus type II secretion system. Martynowski D, Grochulski P, Howard PS; Acta Crystallogr D Biol Crystallogr. 2013;69:142-149. PMID:23385451

2: Involvement of the GspAB complex in assembly of the type II secretion system secretin of Aeromonas and Vibrio species. Strozen TG, Stanley H, Gu Y, Boyd J, Bagdasarian M, Sandkvist M, Howard SP; J Bacteriol. 2011;193:2322-2331. PMID:21378198