InterPro domain: IPR023833

This entry describes an N-terminal domain found regularly in proteins encoded near a variant form of signal peptidase I such as the SipW protein of Bacillus subtilis. Many though not all members are homologues of camelysin (a casein-cleaving metalloprotease) and TasA (CotN), a metalloprotease that is secreted, along with extracellular polysaccharide (EPS), to be the major protein constituent of the Bacillus subtilis biofilm matrix. Sequencing from several known TasA/CotN proteins shows the cleavage location to be near the centre of the alignment and typical of type I signal peptidases, with small residues at -3 and -1.