View source for 1smm


==Crystal Structure of Cp Rd L41A mutant in oxidized state==
<StructureSection load='1smm' size='340' side='right'caption='[[1smm]], [[Resolution|resolution]] 1.36&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1smm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Clostridium_pasteurianum Clostridium pasteurianum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SMM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SMM 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]] 1.36&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1smm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1smm OCA], [https://pdbe.org/1smm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1smm RCSB], [https://www.ebi.ac.uk/pdbsum/1smm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1smm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RUBR_CLOPA RUBR_CLOPA] Rubredoxin is a small nonheme, iron protein lacking acid-labile sulfide. Its single Fe, chelated to 4 Cys, functions as an electron acceptor and may also stabilize the conformation of the molecule.
== 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/sm/1smm_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=1smm ConSurf].
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== Publication Abstract from PubMed ==
Rubredoxin is a small iron-sulfur (FeS4) protein involved in oxidation-reduction reactions. The side chain of Leu41 near the iron-sulfur center has two conformations, which we suggested previously serve as a gate for a water molecule during the electron transfer process. To establish the role of residue 41 in electron transfer, an [L41A] mutant of Clostridium pasteurianum rubredoxin was constructed and crystallized in both oxidation states. Despite the lack of the gating side chain in this protein, the structure of the reduced [L41A] rubredoxin reveals a specific water molecule in the same position as observed in the reduced wild-type rubredoxin. In contrast, both the wild-type and [L41A] rubredoxins in the oxidized state do not have water molecules in this location. The reduction potential of the [L41A] variant was approximately 50 mV more positive than wild-type. Based on these observations, it is proposed that the site around the Sgamma of Cys9 serves as a port for an electron acceptor. Lastly, the Fe-S distances of the reduced rubredoxin are expanded, while the hydrogen bonds between Sgamma of the cysteines and the backbone amide nitrogens are shortened compared to its oxidized counterpart. This small structural perturbation in the Fe(II)/Fe(III) transition is closely related to the small energy difference which is important in an effective electron transfer agent.

The unique hydrogen bonded water in the reduced form of Clostridium pasteurianum rubredoxin and its possible role in electron transfer.,Park IY, Youn B, Harley JL, Eidsness MK, Smith E, Ichiye T, Kang C J Biol Inorg Chem. 2004 Jun;9(4):423-8. Epub 2004 Apr 6. PMID:15067525<ref>PMID:15067525</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Rubredoxin 3D structures|Rubredoxin 3D structures]]
*[[Rubredoxin PDB structures|Rubredoxin PDB structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Clostridium pasteurianum]]
[[Category: Large Structures]]
[[Category: Eidsness MK]]
[[Category: Harley JL]]
[[Category: Ichiye T]]
[[Category: Kang C]]
[[Category: Park IY]]
[[Category: Smith E]]
[[Category: Youn B]]