Members of this family are predicted to be bacterial transglutaminase-like cysteine proteinases. They contain a conserved Cys-His-Asp catalytic triad. Their structure is predicted to be similar to that of Salmonella typhimurium N-hydroxyarylamine O-acetyltransferase Swiss:Q00267, in Pfam:PF00797, however they lack the sub-domain which is important for arylamine recognition [1].

1: BTLCP proteins: a novel family of bacterial transglutaminase-like cysteine proteinases. Ginalski K, Kinch L, Rychlewski L, Grishin NV; Trends Biochem Sci. 2004;29:392-395. PMID:15288868