View source for 3hcq


==Structural analysis of the choline binding protein ChoX in a semi-closed and ligand-free conformation==
<StructureSection load='3hcq' size='340' side='right'caption='[[3hcq]], [[Resolution|resolution]] 2.89&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3hcq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Sinorhizobium_meliloti Sinorhizobium meliloti]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HCQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HCQ 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]] 2.89&#8491;</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=3hcq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hcq OCA], [https://pdbe.org/3hcq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hcq RCSB], [https://www.ebi.ac.uk/pdbsum/3hcq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hcq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q92N37_RHIME Q92N37_RHIME] 
== 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/hc/3hcq_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=3hcq ConSurf].
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== Publication Abstract from PubMed ==
The periplasmic ligand-binding protein ChoX is part of the ABC transport system ChoVWX that imports choline as a nutrient into the soil bacterium Sinorhizobium meliloti. We have recently reported the crystal structures of ChoX in complex with its ligands choline and acetylcholine and the structure of a fully closed but substrate-free state of ChoX. This latter structure revealed an architecture of the ligand-binding site that is superimposable to the closed, ligand-bound form of ChoX. We report here the crystal structure of ChoX in an unusual, ligand-free conformation that represents a semi-closed form of ChoX. The analysis revealed a subdomain movement in the N-lobe of ChoX. Comparison with the two well-characterized substrate binding proteins, MBP and HisJ, suggests the presence of a similar subdomain in these proteins.

Structural analysis of the choline-binding protein ChoX in a semi-closed and ligand-free conformation.,Oswald C, Smits SH, Hoing M, Bremer E, Schmitt L Biol Chem. 2009 Nov;390(11):1163-70. PMID:19642870<ref>PMID:19642870</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3hcq" style="background-color:#fffaf0;"></div>

==See Also==
*[[ABC transporter 3D structures|ABC transporter 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sinorhizobium meliloti]]
[[Category: Bremer E]]
[[Category: Hoeing M]]
[[Category: Oswald C]]
[[Category: Schmitt L]]
[[Category: Smits SHJ]]