A comparison of staphostatin B with standard mechanism serine protease inhibitors.Filipek, R., Potempa, J., Bochtler, M.
(2005) J Biol Chem 280: 14669-14674
- PubMed: 15644332
- DOI: 10.1074/jbc.M411792200
- Primary Citation of Related Structures:
- PubMed Abstract:
- The Staphostatin-staphopain complex: a forward binding inhibitor in complex with its target cysteine protease.
Filipek, R., Rzychon, M., Oleksy, A., Gruca, M., Dubin, A., Potempa, J., Bochtler, M.
(2003) J Biol Chem 278: 40959
- Staphostatins resemble lipocalins, not cystatins in fold.
Rzychon, M., Filipek, R., Sabat, A., Kosowska, K., Dubin, A., Potempa, J., Bochtler, M.
(2003) Protein Sci 12: 2252
- Staphostatins: an expanding new group of proteinase inhibitors with a unique specificity for the regulation of staphopains, Staphylococcus spp. cysteine proteinases.
Rzychon, M., Sabat, A., Kosowska, K., Potempa, J., Dubin, A.
(2003) Mol Microbiol 49: 1051
- Prostaphopain B structure: a comparison of proregion-mediated and staphostatin-mediated protease inhibition.
Filipek, R., Szczepanowski, R., Sabat, A., Potempa, J., Bochtler, M.
(2004) Biochemistry 43: 14306
Staphostatins are the endogenous, highly specific inhibitors of staphopains, the major secreted cysteine proteases from Staphylococcus aureus. We have previously shown that staphostatins A and B are competitive, active site-directed inhibitors that s ...
Staphostatins are the endogenous, highly specific inhibitors of staphopains, the major secreted cysteine proteases from Staphylococcus aureus. We have previously shown that staphostatins A and B are competitive, active site-directed inhibitors that span the active site clefts of their target proteases in the same orientation as substrates. We now report the crystal structure of staphostatin B in complex with wild-type staphopain B at 1.9 A resolution. In the complex structure, the catalytic residues are found in exactly the positions that would be expected for uncomplexed papain-type proteases. There is robust, continuous density for the staphostatin B binding loop and no indication for cleavage of the peptide bond that comes closest to the active site cysteine of staphopain B. The carbonyl carbon atom C of this peptide bond is 4.1 A away from the active site cysteine sulfur Sgamma atom. The carbonyl oxygen atom O of this peptide bond points away from the putative oxyanion hole and lies almost on a line from the Sgamma atom to the C atom. The arrangement is strikingly similar to the "ionmolecule" arrangement for the complex of papain-type enzymes with their substrates but differs significantly from the arrangement conventionally assumed for the Michaelis complex of papain-type enzymes with their substrates and also from the arrangement that is crystallographically observed for complexes of standard mechanism inhibitors and their target serine proteases.
International Institute of Molecular and Cell Biology, ul. Trojdena 4, 02-109 Warsaw, Poland.