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1qq3

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[[Image:1qq3.gif|left|200px]]
 
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==THE SOLUTION STRUCTURE OF THE HEME BINDING VARIANT ARG98CYS OF OXIDIZED ESCHERICHIA COLI CYTOCHROME B562==
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The line below this paragraph, containing "STRUCTURE_1qq3", creates the "Structure Box" on the page.
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<StructureSection load='1qq3' size='340' side='right'caption='[[1qq3]]' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1qq3]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QQ3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QQ3 FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=HEB:HEME+B/C'>HEB</scene></td></tr>
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{{STRUCTURE_1qq3| PDB=1qq3 | SCENE= }}
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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=1qq3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qq3 OCA], [https://pdbe.org/1qq3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qq3 RCSB], [https://www.ebi.ac.uk/pdbsum/1qq3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qq3 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/C562_ECOLX C562_ECOLX] Electron-transport protein of unknown function.
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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/qq/1qq3_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=1qq3 ConSurf].
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<div style="clear:both"></div>
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'''THE SOLUTION STRUCTURE OF THE HEME BINDING VARIANT ARG98CYS OF OXIDIZED ESCHERICHIA COLI CYTOCHROME B562'''
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==See Also==
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*[[Cytochrome b5 3D structures|Cytochrome b5 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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An NMR characterization of the 98Arg --&gt; Cys variant of iron (III)-containing cytochrome b562 from Escherichia coli has been performed and the solution structure obtained. This variant has a covalent bond between the heme and Cys 98, thus mimicking the heme binding in cytochrome c. The R98C cytochrome is shown to have a significantly increased stability, compared to that of wild type, toward thermal and chemical denaturation. In water at 20 degrees C it is 5.60 kJ mol-1 more stable than the WT protein, measured by equilibrium guanidine hydrochloride denaturation. The structure has been obtained through two-dimensional total correlation spectroscopy (TOCSY) and nuclear Overhauser effect spectroscopy (NOESY) experiments and through three-dimensional NOESY-15N heteronuclear multiple quantum coherence (HMQC). By these methods, 85% of protons and 100% of backbone nitrogens were assigned. 2145 meaningful nuclear Overhauser effects (NOEs) (20 NOEs per residue), 45 backbone 3J values, and 397 pseudocontact shifts were used to obtain a family of 35 members, which were then energy-minimized. The root-mean-square deviation (RMSD) with respect to the average structure is 0.50 +/- 0.07 for the backbone and 1.01 +/- 0.08 for the heavy atoms. The magnetic anisotropy resulting from analysis of the pseudocontact shifts indicates an anisotropy that is an intermediate between that of the wild-type, which is the smallest, and cytochrome c. The g values confirm a higher anisotropy of the variant with respect to the wild-type protein. The chirality of the heme 2 alpha carbon is the same as that in all naturally occurring cytochromes c. The overall secondary structure and tertiary structure are very similar to the wild type. The removal of Arg 98 causes a change in the pH-dependent properties. The pKa, proposed to be due to deprotonation of the coordinated histidine, is 1.5 units higher than in the wild type, consistent with the lack of the positive charge of Arg 98 close to the ionizable group. This is further support for the coordinated histidine being the titratable group with an alkaline pKa in the wild-type protein. The pattern of the shifts of the heme methyl groups is different than in the wild-type protein, presumably due to alteration of the electronic structure by the presence of the covalent bond between the protein and the heme. The difference in stability between the variant and wild-type protein is discussed in terms of the structural information.
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==About this Structure==
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1QQ3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QQ3 OCA].
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==Reference==
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Structural consequences of b- to c-type heme conversion in oxidized Escherichia coli cytochrome b562., Arnesano F, Banci L, Bertini I, Ciofi-Baffoni S, Woodyear TL, Johnson CM, Barker PD, Biochemistry. 2000 Feb 15;39(6):1499-514. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10684632 10684632]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Arnesano, F.]]
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[[Category: Arnesano F]]
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[[Category: Banci, L.]]
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[[Category: Banci L]]
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[[Category: Barker, P D.]]
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[[Category: Barker PD]]
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[[Category: Bertini, I.]]
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[[Category: Bertini I]]
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[[Category: Ciofi-Baffoni, S.]]
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[[Category: Ciofi-Baffoni S]]
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[[Category: Woodyear, T.]]
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[[Category: Woodyear T]]
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[[Category: Electron transport]]
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[[Category: Four helix bundle]]
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[[Category: Hemoprotein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:34:34 2008''
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Current revision

THE SOLUTION STRUCTURE OF THE HEME BINDING VARIANT ARG98CYS OF OXIDIZED ESCHERICHIA COLI CYTOCHROME B562

PDB ID 1qq3

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