Members of this family are surface lipoprotein zinc metalloproteases, from the family that includes accessory colonization factor AcfD from Vibrio cholerae, SslE (YghJ ) from E. coli (Secreted and Surface-associated Lipoprotein from E. coli), and VPA1376 from Vibrio parahaemolyticus. Each is about 1500 amino acids long, and SslE is a known substrate of a type II secretion system (T2SS). SslE is known to have mucinase activity.