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New page: left|200px<br /><applet load="1itk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1itk, resolution 2.0Å" /> '''Crystal structure of ... |
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== | ==Crystal structure of catalase-peroxidase from Haloarcula marismortui== | ||
Catalase-peroxidase is a member of the class I peroxidase superfamily. The | <StructureSection load='1itk' size='340' side='right'caption='[[1itk]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1itk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Haloarcula_marismortui Haloarcula marismortui]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ITK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ITK FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=UNX:UNKNOWN+ATOM+OR+ION'>UNX</scene></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=1itk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1itk OCA], [https://pdbe.org/1itk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1itk RCSB], [https://www.ebi.ac.uk/pdbsum/1itk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1itk ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/KATG2_HALMA KATG2_HALMA] Bifunctional enzyme with both catalase and broad-spectrum peroxidase activity.[HAMAP-Rule:MF_01961] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/it/1itk_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1itk ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Catalase-peroxidase is a member of the class I peroxidase superfamily. The enzyme exhibits both catalase and peroxidase activities to remove the harmful peroxide molecule from the living cell. The 2.0 A crystal structure of the catalase-peroxidase from Haloarcula marismortui (HmCP) reveals that the enzyme is a dimer of two identical subunits. Each subunit is composed of two structurally homologous domains with a topology similar to that of class I peroxidase. The active site of HmCP is in the N-terminal domain. Although the arrangement of the catalytic residues and the cofactor heme b in the active site is virtually identical to that of class I peroxidases, the heme moiety is buried inside the domain, similar to that in a typical catalase. In the vicinity of the active site, novel covalent bonds are formed among the side chains of three residues, including that of a tryptophan on the distal side of the heme. Together with the C-terminal domain, these covalent bonds fix two long loops on the surface of the enzyme that cover the substrate access channel to the active site. These features provide an explanation for the dual activities of this enzyme. | |||
The 2.0 A crystal structure of catalase-peroxidase from Haloarcula marismortui.,Yamada Y, Fujiwara T, Sato T, Igarashi N, Tanaka N Nat Struct Biol. 2002 Sep;9(9):691-5. PMID:12172540<ref>PMID:12172540</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
[[ | <div class="pdbe-citations 1itk" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Catalase 3D structures|Catalase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Haloarcula marismortui]] | [[Category: Haloarcula marismortui]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Fujiwara | [[Category: Fujiwara T]] | ||
[[Category: Igarashi | [[Category: Igarashi N]] | ||
[[Category: Sato | [[Category: Sato T]] | ||
[[Category: Tanaka | [[Category: Tanaka N]] | ||
[[Category: Yamada | [[Category: Yamada Y]] | ||
Latest revision as of 02:36, 28 December 2023
Crystal structure of catalase-peroxidase from Haloarcula marismortuiCrystal structure of catalase-peroxidase from Haloarcula marismortui
Structural highlights
FunctionKATG2_HALMA Bifunctional enzyme with both catalase and broad-spectrum peroxidase activity.[HAMAP-Rule:MF_01961] 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 PubMedCatalase-peroxidase is a member of the class I peroxidase superfamily. The enzyme exhibits both catalase and peroxidase activities to remove the harmful peroxide molecule from the living cell. The 2.0 A crystal structure of the catalase-peroxidase from Haloarcula marismortui (HmCP) reveals that the enzyme is a dimer of two identical subunits. Each subunit is composed of two structurally homologous domains with a topology similar to that of class I peroxidase. The active site of HmCP is in the N-terminal domain. Although the arrangement of the catalytic residues and the cofactor heme b in the active site is virtually identical to that of class I peroxidases, the heme moiety is buried inside the domain, similar to that in a typical catalase. In the vicinity of the active site, novel covalent bonds are formed among the side chains of three residues, including that of a tryptophan on the distal side of the heme. Together with the C-terminal domain, these covalent bonds fix two long loops on the surface of the enzyme that cover the substrate access channel to the active site. These features provide an explanation for the dual activities of this enzyme. The 2.0 A crystal structure of catalase-peroxidase from Haloarcula marismortui.,Yamada Y, Fujiwara T, Sato T, Igarashi N, Tanaka N Nat Struct Biol. 2002 Sep;9(9):691-5. PMID:12172540[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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