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| | ==Structure of the mutant VAL169CYS of catalase HPII from Escherichia coli== | | ==Structure of the mutant VAL169CYS of catalase HPII from Escherichia coli== |
| - | <StructureSection load='1cf9' size='340' side='right' caption='[[1cf9]], [[Resolution|resolution]] 1.80Å' scene=''> | + | <StructureSection load='1cf9' size='340' side='right'caption='[[1cf9]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1cf9]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CF9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CF9 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1cf9]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CF9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CF9 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8Å</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Catalase Catalase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.6 1.11.1.6] </span></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1cf9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cf9 OCA], [http://pdbe.org/1cf9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1cf9 RCSB], [http://www.ebi.ac.uk/pdbsum/1cf9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1cf9 ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1cf9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cf9 OCA], [https://pdbe.org/1cf9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cf9 RCSB], [https://www.ebi.ac.uk/pdbsum/1cf9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cf9 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CATE_ECOLI CATE_ECOLI]] Decomposes hydrogen peroxide into water and oxygen; serves to protect cells from the toxic effects of hydrogen peroxide. | + | [https://www.uniprot.org/uniprot/CATE_ECOLI CATE_ECOLI] Decomposes hydrogen peroxide into water and oxygen; serves to protect cells from the toxic effects of hydrogen peroxide. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | ==See Also== | | ==See Also== |
| - | *[[Catalase|Catalase]] | + | *[[Catalase 3D structures|Catalase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bacillus coli migula 1895]] | + | [[Category: Escherichia coli]] |
| - | [[Category: Catalase]] | + | [[Category: Large Structures]] |
| - | [[Category: Fita, I]] | + | [[Category: Fita I]] |
| - | [[Category: Loewen, P C]] | + | [[Category: Loewen PC]] |
| - | [[Category: Mate, M J]] | + | [[Category: Mate MJ]] |
| - | [[Category: Covalent modification]]
| + | |
| - | [[Category: Hydrogen peroxide]]
| + | |
| - | [[Category: Oxidoreductase]]
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| Structural highlights
Function
CATE_ECOLI Decomposes hydrogen peroxide into water and oxygen; serves to protect cells from the toxic effects of hydrogen peroxide.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The three-dimensional structures of two HPII variants, V169C and H392Q, have been determined at resolutions of 1.8 and 2.1 A, respectively. The V169C variant contains a new type of covalent bond between the sulfur atom of Cys(169) and a carbon atom on the imidazole ring of the essential His(128). This variant enzyme has only residual catalytic activity and contains heme b. The chain of water molecules visible in the main channel may reflect the organization of the hydrogen peroxide substrates in the active enzyme. Two alternative mechanisms, involving either compound I or free radical intermediates, are presented to explain the formation of the Cys-His covalent bond. The H392Q and H392E variants exhibit 75 and 25% of native catalytic activity, respectively. The Gln(392) variant contains only heme b, whereas the Glu(392) variant contains a mixture of heme b and cis and trans isomers of heme d, suggesting of a role for this residue in heme conversion. Replacement of either Gln(419) and Ser(414), both of which interact with the heme, affected the cis:trans ratio of spirolactone heme d. Implications for the heme oxidation mechanism and the His-Tyr bond formation in HPII are considered.
Mutants that alter the covalent structure of catalase hydroperoxidase II from Escherichia coli.,Mate MJ, Sevinc MS, Hu B, Bujons J, Bravo J, Switala J, Ens W, Loewen PC, Fita I J Biol Chem. 1999 Sep 24;274(39):27717-25. PMID:10488114[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Mate MJ, Sevinc MS, Hu B, Bujons J, Bravo J, Switala J, Ens W, Loewen PC, Fita I. Mutants that alter the covalent structure of catalase hydroperoxidase II from Escherichia coli. J Biol Chem. 1999 Sep 24;274(39):27717-25. PMID:10488114
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