View source for 1xad


==CHIMERA ISOPROPYLMALATE DEHYDROGENASE BETWEEN BACILLUS SUBTILIS (M) AND THERMUS THERMOPHILUS (T) FROM N-TERMINAL: 20% T MIDDLE 20% M RESIDUAL 60% T, MUTATED AT S82R. LOW TEMPERATURE (150K) STRUCTURE.==
<StructureSection load='1xad' size='340' side='right' caption='[[1xad]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1xad]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Thet8 Thet8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XAD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1XAD FirstGlance]. <br>
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/3-isopropylmalate_dehydrogenase 3-isopropylmalate dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.85 1.1.1.85] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1xad FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xad OCA], [http://pdbe.org/1xad PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1xad RCSB], [http://www.ebi.ac.uk/pdbsum/1xad PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1xad ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/LEU3_THETH LEU3_THETH]] Catalyzes the oxidation of 3-carboxy-2-hydroxy-4-methylpentanoate (3-isopropylmalate) to 3-carboxy-4-methyl-2-oxopentanoate. The product decarboxylates to 4-methyl-2 oxopentanoate. 
== 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/xa/1xad_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=1xad ConSurf].
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== Publication Abstract from PubMed ==
The crystal structures of thermostable enzyme, 3-isopropylmalate dehydrogenase of Thermus thermophilus (10T) and a chimeric enzyme between T. thermophilus and Bacillus subtilus with one point mutation (cS82R), were determined at both 100 and 150 K. At the cryogenic condition, the volume of the unit cell decreased by 5% as a result of a contraction in the solvent region. Although the overall structures of both enzymes at low temperature were the same as that of 10T at room temperature, interactions between two domains and between two subunits in a functional dimer of cS82R were significantly altered. The decrease in the average temperature factor of 10T at low temperature and no significant decrease for cS82R suggested that the structure of the engineered enzyme (cS82R) may have many conformational substates even at low temperature, while the native enzyme (10T) at low temperature has a more definite conformation than that at room temperature. The location of water molecules around the enzyme molecule and the calculation of the radii of gyration suggested that cS82R had a weaker hydration than 10T.

Cryocrystallography of 3-Isopropylmalate dehydrogenase from Thermus thermophilus and its chimeric enzyme.,Nagata C, Moriyama H, Tanaka N, Nakasako M, Yamamoto M, Ueki T, Oshima T Acta Crystallogr D Biol Crystallogr. 1996 Jul 1;52(Pt 4):623-30. PMID:15299625<ref>PMID:15299625</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Isopropylmalate dehydrogenase|Isopropylmalate dehydrogenase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: 3-isopropylmalate dehydrogenase]]
[[Category: Thet8]]
[[Category: Moriyama, H]]
[[Category: Nagata, C]]
[[Category: Tanaka, N]]
[[Category: Chimera]]
[[Category: Oxidoreductase]]