The founder member of this family is S. aureus sortase, a transpeptidase that attaches surface proteins by the threonine of an LPXTG motif to the cell wall [1].

1: Staphylococcus aureus sortase, an enzyme that anchors surface proteins to the cell wall. Mazmanian SK, Liu G, Ton-That H, Schneewind O; Science 1999;285:760-763. PMID:10427003

2: An embarrassment of sortases - a richness of substrates? Pallen MJ, Lam AC, Antonio M, Dunbar K; Trends Microbiol 2001;9:97-102. PMID:11239768