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1c52

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[[Image:1c52.gif|left|200px]]<br /><applet load="1c52" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1c52, resolution 1.28&Aring;" />
 
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'''THERMUS THERMOPHILUS CYTOCHROME-C552: A NEW HIGHLY THERMOSTABLE CYTOCHROME-C STRUCTURE OBTAINED BY MAD PHASING'''<br />
 
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==Overview==
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==THERMUS THERMOPHILUS CYTOCHROME-C552: A NEW HIGHLY THERMOSTABLE CYTOCHROME-C STRUCTURE OBTAINED BY MAD PHASING==
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The three-dimensional structure of cytochrome-c552 from Thermus thermophilus has been determined by the multiple anomalous dispersion technique using synchrotron radiation and refined to a resolution of 1.28 A. Data collection at 90 K and the recording of three data sets (f'-minimum: 7125 eV, f"-maximum: 7138 eV and reference for scaling: 10,077 eV) resulted in an initial electron density of very high quality at 2.1 A, which was readily interpretable for model building. The model was refined to an R value of 19.1% (Rfree=22.4%) at 1.28 A resolution using a fourth data set collected at a photon energy of 11,810 eV. Comparison of this thermophilic cytochrome with its mesophilic mitochondrial or bacterial counterparts reveals significant structural differences which are discussed with respect to their importance for thermostability and binding between this cytochrome and its corresponding ba3-oxidase. Amino acid sequence similarities to other class I cytochromes are very weak and entirely limited to the region around the CXXCH motif close to the N terminus. The N-terminal two-thirds of cytochrome-c552 cover spatial regions around the heme prosthetic group that are similar to those observed for other cytochromes. The actual secondary structural elements that are responsible for that shielding do not, however, correlate well to other structures. Only the N-terminal helix (containing the heme binding cysteine residues) aligns reasonably well with other class I cytochromes. The most striking differences that distinguish the present structure from all other class I cytochromes is the C-terminal one-third of the molecule that wraps around the remainder of the structure as a stabilizing clamp, the existence of an extended beta-sheet covering one edge of the heme and the lack of any internal water molecule.
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<StructureSection load='1c52' size='340' side='right'caption='[[1c52]], [[Resolution|resolution]] 1.28&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1c52]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1C52 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1C52 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]] 1.28&#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=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</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=1c52 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1c52 OCA], [https://pdbe.org/1c52 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1c52 RCSB], [https://www.ebi.ac.uk/pdbsum/1c52 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1c52 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CY552_THETH CY552_THETH] This monoheme basic protein appears to function as an electron donor to cytochrome oxidase in T.thermophilus.
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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/c5/1c52_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=1c52 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1C52 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus] with <scene name='pdbligand=HEM:'>HEM</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1C52 OCA].
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*[[Cytochrome c nitrite reductase|Cytochrome c nitrite reductase]]
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__TOC__
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==Reference==
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</StructureSection>
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Thermus thermophilus cytochrome-c552: A new highly thermostable cytochrome-c structure obtained by MAD phasing., Than ME, Hof P, Huber R, Bourenkov GP, Bartunik HD, Buse G, Soulimane T, J Mol Biol. 1997 Aug 29;271(4):629-44. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9281430 9281430]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Thermus thermophilus]]
[[Category: Thermus thermophilus]]
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[[Category: Bartunik, H D.]]
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[[Category: Bartunik HD]]
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[[Category: Bourenkov, G P.]]
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[[Category: Bourenkov GP]]
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[[Category: Buse, G.]]
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[[Category: Buse G]]
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[[Category: Hof, P.]]
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[[Category: Hof P]]
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[[Category: Huber, R.]]
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[[Category: Huber R]]
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[[Category: Soulimane, T.]]
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[[Category: Soulimane T]]
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[[Category: Than, M E.]]
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[[Category: Than ME]]
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[[Category: HEM]]
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[[Category: cytochrome-c552]]
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[[Category: electron transport protein]]
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[[Category: mad]]
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[[Category: thermostability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:02:29 2008''
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Current revision

THERMUS THERMOPHILUS CYTOCHROME-C552: A NEW HIGHLY THERMOSTABLE CYTOCHROME-C STRUCTURE OBTAINED BY MAD PHASING

PDB ID 1c52

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