Members of this family are functionally uncharacterised. However it has been predicted that these proteins are functionally equivalent to the UmuD subunit of polymerase V from gram-negative bacteria [1]. This family has been shown to belong to the WYL-like superfamily [2].

1: Damage-repair error-prone polymerases of eubacteria: association with mobile genome elements. Permina EA, Mironov AA, Gelfand MS; Gene. 2002;293:133-140. PMID:12137951

2: CARF and WYL domains: ligand-binding regulators of prokaryotic defense systems. Makarova KS, Anantharaman V, Grishin NV, Koonin EV, Aravind L; Front Genet. 2014;5:102. PMID:24817877