Outer membrane porin D is a protein family containing bacterial outer membraneporins which are involved in transport of cationic amino acids, peptides, antibiotics and other compounds.
It was also described as having some serine protease activity.[1] However many of these proteins are not peptidases and are classified as non-peptidase homologues as they either have been found experimentally to be without peptidase activity, or lack amino acidresidues that are believed to be essential for the catalytic activity of peptidases in the S43 family.
References
^Yoshihara E, Yoneyama H, Ono T, Nakae T (June 1998). "Identification of the catalytic triad of the protein D2 protease in Pseudomonas aeruginosa". Biochem. Biophys. Res. Commun. 247 (1): 142–5. doi:10.1006/bbrc.1998.8745. PMID9636669.{{cite journal}}: CS1 maint: multiple names: authors list (link)
