View source for 1hqs


==CRYSTAL STRUCTURE OF ISOCITRATE DEHYDROGENASE FROM BACILLUS SUBTILIS==
<StructureSection load='1hqs' size='340' side='right'caption='[[1hqs]], [[Resolution|resolution]] 1.55&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1hqs]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HQS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HQS 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]] 1.55&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=CME:S,S-(2-HYDROXYETHYL)THIOCYSTEINE'>CME</scene>, <scene name='pdbligand=PGO:S-1,2-PROPANEDIOL'>PGO</scene>, <scene name='pdbligand=PGR:R-1,2-PROPANEDIOL'>PGR</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=1hqs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hqs OCA], [https://pdbe.org/1hqs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hqs RCSB], [https://www.ebi.ac.uk/pdbsum/1hqs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hqs ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IDH_BACSU IDH_BACSU] 
== 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/hq/1hqs_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=1hqs ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Isocitrate dehydrogenase from Bacillus subtilis (BsIDH) is a member of a family of metal-dependent decarboxylating dehydrogenases. Its crystal structure was solved to 1.55 A and detailed comparisons with the homologue from Escherichia coli (EcIDH), the founding member of this family, were made. Although the two IDHs are structurally similar, there are three notable differences between them. First, a mostly nonpolar beta-strand and two connecting loops in the small domain of EcIDH are replaced by two polar alpha-helices in BsIDH. Because of a 13-residue insert in this region of BsIDH, these helices protrude over the active site cleft of the opposing monomer. Second, a coil leading into this cleft, the so-called "phosphorylation" loop, is bent inward in the B. subtilis enzyme, narrowing the entrance to the active site from about 12 to 4 A. Third, although BsIDH is a homodimer, the two unique crystallographic subunits of BsIDH are not structurally identical. The two monomers appear to differ by a domain shift of the large domain relative to the small domain/clasp region, reminiscent of what has been observed in the open/closed conformations of EcIDH. In Escherichia coli, IDH is regulated by reversible phosphorylation by the bifunctional enzyme IDH kinase/phosphatase (IDH-K/P). The site of phosphorylation is Ser(113), which lies deep within the active site crevice. Structural differences between EcIDH and BsIDH may explain disparities in their abilities to act as substrates for IDH-K/P.

Crystal structure of Bacillus subtilis isocitrate dehydrogenase at 1.55 A. Insights into the nature of substrate specificity exhibited by Escherichia coli isocitrate dehydrogenase kinase/phosphatase.,Singh SK, Matsuno K, LaPorte DC, Banaszak LJ J Biol Chem. 2001 Jul 13;276(28):26154-63. Epub 2001 Apr 4. PMID:11290745<ref>PMID:11290745</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 1hqs" style="background-color:#fffaf0;"></div>

==See Also==
*[[Isocitrate dehydrogenase 3D structures|Isocitrate dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus subtilis]]
[[Category: Large Structures]]
[[Category: Banaszak LJ]]
[[Category: LaPorte DC]]
[[Category: Matsuno K]]
[[Category: Singh SK]]