... Residues of the catalytic triad are indicated by an asterisk.Secondary structural elements based on knowncrystal structures of PRK are indicated by h(helix) and s (strand) and calcium bindingligands ... i.e. Cys67–Cys99 and Cys163–Cys194 (numbering of VPR from the N-terminal of theproteinase domain (see Fig. 2 or 3). The proteinase domain of VPR additionally contains Cys277 and Cys281, and Cys351 ... Miyamoto, K., Tanaka, K., Kaidzu, Y. , Imada, C.,Okami, Y. & Inamori, Y. (1996) Cloning and sequence analysis of a protease-encoding gene from the marine bacteriumAlteromonas sp. starin...