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| | <StructureSection load='3ej6' size='340' side='right'caption='[[3ej6]], [[Resolution|resolution]] 2.30Å' scene=''> | | <StructureSection load='3ej6' size='340' side='right'caption='[[3ej6]], [[Resolution|resolution]] 2.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3ej6]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Neurospora_crassa Neurospora crassa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3EJ6 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=3EJ6 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3ej6]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Neurospora_crassa Neurospora crassa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3EJ6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3EJ6 FirstGlance]. <br> |
| - | </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>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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]] 2.3Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1sy7|1sy7]], [[1gge|1gge]], [[2iuf|2iuf]]</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>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></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='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3ej6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ej6 OCA], [https://pdbe.org/3ej6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ej6 RCSB], [https://www.ebi.ac.uk/pdbsum/3ej6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ej6 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=3ej6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ej6 OCA], [http://pdbe.org/3ej6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3ej6 RCSB], [http://www.ebi.ac.uk/pdbsum/3ej6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3ej6 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CAT3_NEUCR CAT3_NEUCR]] Occurs in almost all aerobically respiring organisms and serves to protect cells from the toxic effects of hydrogen peroxide (By similarity). | + | [https://www.uniprot.org/uniprot/CAT3_NEUCR CAT3_NEUCR] Occurs in almost all aerobically respiring organisms and serves to protect cells from the toxic effects of hydrogen peroxide (By similarity). |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Catalase]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Neurospora crassa]] | | [[Category: Neurospora crassa]] |
| - | [[Category: Diaz, A]] | + | [[Category: Diaz A]] |
| - | [[Category: Hansberg, W]] | + | [[Category: Hansberg W]] |
| - | [[Category: Horjales, E]] | + | [[Category: Horjales E]] |
| - | [[Category: Rudino-Pinera, E]] | + | [[Category: Rudino-Pinera E]] |
| - | [[Category: Valdes, V J]] | + | [[Category: Valdes V-J]] |
| - | [[Category: Heme]]
| + | |
| - | [[Category: Hydrogen peroxide]]
| + | |
| - | [[Category: Iron]]
| + | |
| - | [[Category: Large catalase structure]]
| + | |
| - | [[Category: Metal-binding]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| - | [[Category: Peroxidase]]
| + | |
| Structural highlights
Function
CAT3_NEUCR Occurs in almost all aerobically respiring organisms and serves to protect cells from the toxic effects of hydrogen peroxide (By similarity).
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
Neurospora crassa has two large-subunit catalases, CAT-1 and CAT-3. CAT-1 is associated with non-growing cells and accumulates particularly in asexual spores; CAT-3 is associated with growing cells and is induced under different stress conditions. It is our interest to elucidate the structure-function relationships in large-subunit catalases. Here we have determined the CAT-3 crystal structure and compared it with the previously determined CAT-1 structure. Similar to CAT-1, CAT-3 hydrogen peroxide (H(2)O(2)) saturation kinetics exhibited two components, consistent with the existence of two active sites: one saturated in the millimolar range and the other in the molar range. In the CAT-1 structure, we found three interesting features related to its unusual kinetics: (a) a constriction in the channel that conveys H(2)O(2) to the active site; (b) a covalent bond between the tyrosine, which forms the fifth coordination bound to the iron of the heme, and a vicinal cysteine; (c) oxidation of the pyrrole ring III to form a cis-hydroxyl group in C5 and a cis-gamma-spirolactone in C6. The site of heme oxidation marks the starts of the central channel that communicates to the central cavity and the shortest way products can exit the active site. CAT-3 has a similar constriction in its major channel, which could function as a gating system regulated by the H(2)O(2) concentration before the gate. CAT-3 functional tyrosine is not covalently bonded, but has instead the electron relay mechanism described for the human catalase to divert electrons from it. Pyrrole ring III in CAT-3 is not oxidized as it is in other large-subunit catalases whose structure has been determined. Different in CAT-3 from these enzymes is an occupied central cavity. Results presented here indicate that CAT-3 and CAT-1 enzymes represent a functional group of catalases with distinctive structural characteristics that determine similar kinetics.
Structure-function relationships in fungal large-subunit catalases.,Diaz A, Valdes VJ, Rudino-Pinera E, Horjales E, Hansberg W J Mol Biol. 2009 Feb 13;386(1):218-32. Epub 2008 Dec 14. PMID:19109972[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Diaz A, Valdes VJ, Rudino-Pinera E, Horjales E, Hansberg W. Structure-function relationships in fungal large-subunit catalases. J Mol Biol. 2009 Feb 13;386(1):218-32. Epub 2008 Dec 14. PMID:19109972 doi:10.1016/j.jmb.2008.12.019
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