1k7g
From Proteopedia
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|PDB= 1k7g |SIZE=350|CAPTION= <scene name='initialview01'>1k7g</scene>, resolution 2.0Å | |PDB= 1k7g |SIZE=350|CAPTION= <scene name='initialview01'>1k7g</scene>, resolution 2.0Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand= | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= prtC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=556 Erwinia chrysanthemi]) | |GENE= prtC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=556 Erwinia chrysanthemi]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1kap|1KAP]], [[1sat|1SAT]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1k7g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k7g OCA], [http://www.ebi.ac.uk/pdbsum/1k7g PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1k7g RCSB]</span> | ||
}} | }} | ||
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[[Category: Baumann, U.]] | [[Category: Baumann, U.]] | ||
[[Category: Hege, T.]] | [[Category: Hege, T.]] | ||
| - | [[Category: CA]] | ||
| - | [[Category: PO4]] | ||
| - | [[Category: ZN]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: metalloprotease]] | [[Category: metalloprotease]] | ||
[[Category: protease]] | [[Category: protease]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:44:29 2008'' |
Revision as of 18:44, 30 March 2008
| |||||||
| , resolution 2.0Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , | ||||||
| Gene: | prtC (Erwinia chrysanthemi) | ||||||
| Related: | 1KAP, 1SAT
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
PrtC from Erwinia chrysanthemi
Overview
PrtC, a metallo-protease secreted by Erwinia chrysanthemi, is a member of the serralysin family and hence belongs to the metzincin superfamily. While the crystal structures of representatives of all metzincin subfamilies have been elucidated in the past, there is still some controversy about the reaction mechanism and the role of certain characteristic amino acids in the active centre. In this study, we probed the role of Tyr228 and Glu189 by site-directed mutagenesis and X-ray crystallography. There is evidence that these residues participate in catalysis, although conflicting hypotheses have been proposed. The crystal structures of wild-type and mutants have been refined to an R(free) of about 0.20 at resolutions of 2.0 A or better. Exchange of Glu189 versus alanine reduces the catalytic efficiency to less than 0.5 % using resorufin casein as substrate and to about 3 % using an assay utilising the thiol ester Ac-Pro-Leu-Gly-[(S)Leu]-Leu-Gly-OEt. The drop in activity is caused by a reduction in k(cat) while the K(M) values are virtually the same. In the resorufin casein assay, the mutant Y228F shows about 3 % of the wild-type activity and in the thiol ester assay this increases to about 56 %. In the latter case, the K(M) value of the mutant is increased from 5.3 mM to 9.0 mM with only little reduction in k(cat). The different behaviour of this mutant with respect to the two substrates can be explained by a switch in the rate-determining step during catalysis. The study presented here provides clear evidence that Glu189 of the HEXXHXXGXXH motif is the catalytic base, while Tyr228 is more likely involved in substrate binding and the stabilisation of the tetrahedral transition state.
About this Structure
1K7G is a Single protein structure of sequence from Erwinia chrysanthemi. Full crystallographic information is available from OCA.
Reference
Protease C of Erwinia chrysanthemi: the crystal structure and role of amino acids Y228 and E189., Hege T, Baumann U, J Mol Biol. 2001 Nov 23;314(2):187-93. PMID:11718553
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