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1cxp

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[[Image:1cxp.jpg|left|200px]]<br /><applet load="1cxp" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1cxp, resolution 1.80&Aring;" />
 
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'''CRYOGENIC CRYSTAL STRUCTURE OF HUMAN MYELOPEROXIDASE ISOFORM C'''<br />
 
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==Overview==
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==CRYOGENIC CRYSTAL STRUCTURE OF HUMAN MYELOPEROXIDASE ISOFORM C==
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The x-ray crystal structure of human myeloperoxidase has been extended to, 1.8 A resolution, using x-ray data recorded at -180 degrees C (r = 0.197, free r = 0.239). Results confirm that the heme is covalently attached to, the protein via two ester linkages between the carboxyl groups of Glu(242), and Asp(94) and modified methyl groups on pyrrole rings A and C of the, heme as well as a sulfonium ion linkage between the sulfur atom of, Met(243) and the beta-carbon of the vinyl group on pyrrole ring A. In the, native enzyme a bound chloride ion has been identified at the amino, terminus of the helix containing the proximal His(336). Determination of, the x-ray crystal structure of a myeloperoxidase-bromide complex (r =, 0.243, free r = 0.296) has shown that this chloride ion can be replaced by, bromide. Bromide is also seen to bind, at partial occupancy, in the distal, heme cavity, in close proximity to the distal His(95), where it replaces, the water molecule hydrogen bonded to Gln(91). The bromide-binding site in, the distal cavity appears to be the halide-binding site responsible for, shifts in the Soret band of the absorption spectrum of myeloperoxidase. It, is proposed that halide binding to this site inhibits the enzyme by, effectively competing with H(2)O(2) for access to the distal histidine, whereas in compound I, the same site may be the halide substrate-binding, site.
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<StructureSection load='1cxp' size='340' side='right'caption='[[1cxp]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1cxp]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CXP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CXP FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1cxp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cxp OCA], [https://pdbe.org/1cxp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cxp RCSB], [https://www.ebi.ac.uk/pdbsum/1cxp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cxp ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/PERM_HUMAN PERM_HUMAN] Defects in MPO are the cause of myeloperoxidase deficiency (MPOD) [MIM:[https://omim.org/entry/254600 254600]. A disorder characterized by decreased myeloperoxidase activity in neutrophils and monocytes that results in disseminated candidiasis.<ref>PMID:8142659</ref> <ref>PMID:7904599</ref> <ref>PMID:8621627</ref> <ref>PMID:9637725</ref> <ref>PMID:9354683</ref>
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== Function ==
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[https://www.uniprot.org/uniprot/PERM_HUMAN PERM_HUMAN] Part of the host defense system of polymorphonuclear leukocytes. It is responsible for microbicidal activity against a wide range of organisms. In the stimulated PMN, MPO catalyzes the production of hypohalous acids, primarily hypochlorous acid in physiologic situations, and other toxic intermediates that greatly enhance PMN microbicidal activity.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cx/1cxp_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1cxp ConSurf].
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<div style="clear:both"></div>
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==Disease==
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==See Also==
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Known diseases associated with this structure: Alzheimer disease, susceptibility to OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=606989 606989]], Lung cancer, protection against, in smokers OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=606989 606989]], Myeloperoxidase deficiency OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=606989 606989]]
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*[[Myeloperoxidase|Myeloperoxidase]]
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*[[Sandbox WWC11|Sandbox WWC11]]
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==About this Structure==
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== References ==
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1CXP is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=NAG:'>NAG</scene>, <scene name='pdbligand=CA:'>CA</scene>, <scene name='pdbligand=CL:'>CL</scene>, <scene name='pdbligand=SO4:'>SO4</scene>, <scene name='pdbligand=ACT:'>ACT</scene> and <scene name='pdbligand=HEM:'>HEM</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Peroxidase Peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.7 1.11.1.7] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CXP OCA].
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<references/>
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__TOC__
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==Reference==
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</StructureSection>
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X-ray crystal structure and characterization of halide-binding sites of human myeloperoxidase at 1.8 A resolution., Fiedler TJ, Davey CA, Fenna RE, J Biol Chem. 2000 Apr 21;275(16):11964-71. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10766826 10766826]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Peroxidase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Fenna RE]]
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[[Category: Fenna, R.E.]]
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[[Category: Fiedler TJ]]
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[[Category: Fiedler, T.J.]]
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[[Category: ACT]]
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[[Category: CA]]
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[[Category: CL]]
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[[Category: HEM]]
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[[Category: NAG]]
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[[Category: SO4]]
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[[Category: heme-protein]]
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[[Category: oxidoreductase]]
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[[Category: peroxidase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 15:37:47 2008''
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Current revision

CRYOGENIC CRYSTAL STRUCTURE OF HUMAN MYELOPEROXIDASE ISOFORM C

PDB ID 1cxp

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