This family contains metallopeptidases. It also contains non-peptidase homologues such as the N terminal domain of Spt16 which is a histone H3-H4 binding module [3].

1: Structure of the cobalt-dependent methionine aminopeptidase from Escherichia coli: a new type of proteolytic enzyme. Roderick SL, Matthews BW Biochemistry 1993;32:3907-3912. PMID:8471602

2: Evolutionary families of metallopeptidases. Rawlings ND, Barrett AJ; Meth Enzymol 1995;248:183-228. PMID:7674922

3: The FACT Spt16 "peptidase" domain is a histone H3-H4 binding module. Stuwe T, Hothorn M, Lejeune E, Rybin V, Bortfeld M, Scheffzek K, Ladurner AG; Proc Natl Acad Sci U S A. 2008;105:8884-8889. PMID:18579787