This family of archaebacterial proteins, formerly known as DUF114, has been found to be a serine dehydrogenase proteinase distantly related to ClpP proteinases that belong to the serine proteinase superfamily. The family has a catalytic triad of Ser, Asp, His residues, which shows an altered residue ordering compared with the ClpP proteinases but similar to that of the carboxypeptidase clan [1].

1: Identification and analysis of a new family of bacterial serine proteinases. Pandit SB, Srinivasan N; In Silico Biol. 2004;4:563-572. PMID:15752073