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1orb

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[[Image:1orb.jpg|left|200px]]<br /><applet load="1orb" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1orb, resolution 2.0&Aring;" />
 
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'''ACTIVE SITE STRUCTURAL FEATURES FOR CHEMICALLY MODIFIED FORMS OF RHODANESE'''<br />
 
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==Overview==
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==ACTIVE SITE STRUCTURAL FEATURES FOR CHEMICALLY MODIFIED FORMS OF RHODANESE==
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In the course of the reaction catalyzed by rhodanese, the enzyme cycles between two catalytic intermediates, the sulfur-free and the sulfur-substituted (persulfide-containing) forms. The crystal structure of sulfur-free rhodanese, which was prepared in solution and then crystallized, is highly similar to that of sulfur-substituted enzyme. The inactivation of sulfur-free rhodanese with a small molar excess of hydrogen peroxide relies essentially on a modification limited to the active site, consisting of the oxidation of the essential sulfhydryl to sulfenyl group (-S-OH). Upon reaction of the sulfur-free enzyme with monoiodoacetate in the crystal, the Cys-247 side chain with the bound carboxymethyl group is forced into a conformation that allows favorable interactions of the carboxylate with the four peptide NH groups that participate in hydrogen bonding interactions with the transferable sulfur atom of the persulfide group in the sulfur-substituted rhodanese. It is concluded that active site-specific chemical modifications of sulfur-free rhodanese do not lead to significant changes of the protein structure, consistent with a high degree of similarity of the structures of the sulfur-free and sulfur-substituted forms of the enzyme both in solution and in the crystal.
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<StructureSection load='1orb' size='340' side='right'caption='[[1orb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1orb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ORB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ORB 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]] 2&#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></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=1orb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1orb OCA], [https://pdbe.org/1orb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1orb RCSB], [https://www.ebi.ac.uk/pdbsum/1orb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1orb ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/THTR_BOVIN THTR_BOVIN] Together with MRPL18, acts as a mitochondrial import factor for the cytosolic 5S rRNA. Only the nascent unfolded cytoplasmic form is able to bind to the 5S rRNA (By similarity). Formation of iron-sulfur complexes and cyanide detoxification. Binds molecular oxygen and sulfur.
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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/or/1orb_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=1orb 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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1ORB is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=ACT:'>ACT</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Thiosulfate_sulfurtransferase Thiosulfate sulfurtransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.8.1.1 2.8.1.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ORB OCA].
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*[[Sulfurtransferase|Sulfurtransferase]]
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__TOC__
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==Reference==
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</StructureSection>
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Active site structural features for chemically modified forms of rhodanese., Gliubich F, Gazerro M, Zanotti G, Delbono S, Bombieri G, Berni R, J Biol Chem. 1996 Aug 30;271(35):21054-61. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8702871 8702871]
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[[Category: Bos taurus]]
[[Category: Bos taurus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Thiosulfate sulfurtransferase]]
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[[Category: Berni R]]
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[[Category: Berni, R.]]
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[[Category: Delbono S]]
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[[Category: Delbono, S.]]
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[[Category: Gazerro M]]
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[[Category: Gazerro, M.]]
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[[Category: Gliubich F]]
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[[Category: Gliubich, F.]]
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[[Category: Zanotti G]]
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[[Category: Zanotti, G.]]
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[[Category: ACT]]
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[[Category: thiosulfate:cyanide sulfurtransferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:20:43 2008''
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Current revision

ACTIVE SITE STRUCTURAL FEATURES FOR CHEMICALLY MODIFIED FORMS OF RHODANESE

PDB ID 1orb

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