2n6j

Structural highlights

Function

PPEP1_CLOD6 Zinc-dependent endoprotease with a unique preference for proline residues surrounding the scissile bond. Exhibits a high preference for an asparagine at the P2 position and hydrophobic residues (Val, Ile, Leu) at the P3 position. Efficiently cleaves the LPXTG cell surface proteins CD630_28310 and CD630_32460 at multiple cleavage sites in vivo. Has a role in the regulation of C.difficile adhesion versus motility by cleaving surface adhesion proteins such as the collagen binding protein CD630_28310, and is important for efficient infection. Is also able to cleave fibronectin and fibrinogen in vitro; cleaves at the N-terminus of the beta-chain of fibrinogen. Destabilizes the fibronectin network produced by human fibroblasts. Therefore, may be important in key steps of clostridial pathogenesis by degrading extracellular matrix components associated with the gut epithelial cells. To a lesser extent, IgA1, IgA2, and human HSP 90-beta, but not HSP 90-alpha, are also substrates for the enzyme. Is not active on different collagen types, casein and gelatin.^{[1] [2] [3] [4]}

References

1. ↑ Cafardi V, Biagini M, Martinelli M, Leuzzi R, Rubino JT, Cantini F, Norais N, Scarselli M, Serruto D, Unnikrishnan M. Identification of a novel zinc metalloprotease through a global analysis of Clostridium difficile extracellular proteins. PLoS One. 2013 Nov 26;8(11):e81306. doi: 10.1371/journal.pone.0081306., eCollection 2013. PMID:24303041 doi:http://dx.doi.org/10.1371/journal.pone.0081306
2. ↑ Hensbergen PJ, Klychnikov OI, Bakker D, van Winden VJ, Ras N, Kemp AC, Cordfunke RA, Dragan I, Deelder AM, Kuijper EJ, Corver J, Drijfhout JW, van Leeuwen HC. A novel secreted metalloprotease (CD2830) from Clostridium difficile cleaves specific proline sequences in LPXTG cell surface proteins. Mol Cell Proteomics. 2014 May;13(5):1231-44. doi: 10.1074/mcp.M113.034728. Epub, 2014 Mar 12. PMID:24623589 doi:http://dx.doi.org/10.1074/mcp.M113.034728
3. ↑ Peltier J, Shaw HA, Couchman EC, Dawson LF, Yu L, Choudhary JS, Kaever V, Wren BW, Fairweather NF. Cyclic diGMP regulates production of sortase substrates of Clostridium difficile and their surface exposure through ZmpI protease-mediated cleavage. J Biol Chem. 2015 Oct 2;290(40):24453-69. doi: 10.1074/jbc.M115.665091. Epub 2015, Aug 17. PMID:26283789 doi:http://dx.doi.org/10.1074/jbc.M115.665091
4. ↑ Hensbergen PJ, Klychnikov OI, Bakker D, Dragan I, Kelly ML, Minton NP, Corver J, Kuijper EJ, Drijfhout JW, van Leeuwen HC. Clostridium difficile secreted Pro-Pro endopeptidase PPEP-1 (ZMP1/CD2830) modulates adhesion through cleavage of the collagen binding protein CD2831. FEBS Lett. 2015 Dec 21;589(24 Pt B):3952-8. doi: 10.1016/j.febslet.2015.10.027., Epub 2015 Oct 29. PMID:26522134 doi:http://dx.doi.org/10.1016/j.febslet.2015.10.027