View source for 1ipd


==THREE-DIMENSIONAL STRUCTURE OF A HIGHLY THERMOSTABLE ENZYME, 3-ISOPROPYLMALATE DEHYDROGENASE OF THERMUS THERMOPHILUS AT 2.2 ANGSTROMS RESOLUTION==
<StructureSection load='1ipd' size='340' side='right'caption='[[1ipd]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ipd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"flavobacterium_thermophilum"_yoshida_and_oshima_1971 "flavobacterium thermophilum" yoshida and oshima 1971]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IPD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IPD FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1ipd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ipd OCA], [http://pdbe.org/1ipd PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ipd RCSB], [http://www.ebi.ac.uk/pdbsum/1ipd PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ipd ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/LEU3_THET8 LEU3_THET8]] 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.[HAMAP-Rule:MF_01033] 
== 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/ip/1ipd_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=1ipd ConSurf].
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== Publication Abstract from PubMed ==
The three-dimensional structure of the highly thermostable 3-isopropylmalate dehydrogenase (IPMDH) from Thermus thermophilus has been determined by the multiple isomorphous replacement method and refined to 2.2 A resolution. The final R-factor is 0.185 for 20,307 reflections. The crystal asymmetric unit has one subunit consisting of 345 amino acid residues. The polypeptide chain of this subunit is folded into two domains (first and second domains) with parallel alpha/beta motifs. The domains are similar in their conformations and folding topologies, but differ from those of the NAD-binding domains of such well-known enzymes as the alcohol and lactate dehydrogenases. A beta-strand that is a part of the long arm-like polypeptide protruding from the second domain comes into contact with another subunit and contributes to the formation of an isologous dimer with a crystallographic 2-fold symmetry. Close subunit contacts are also present at two alpha-helices in the second domain. These helices strongly interact hydrophobically with the corresponding helices of the other subunit to form a hydrophobic core at the center of the dimer. Two large pockets that exist between the first domain of one subunit and the second domain of the other include the amino acid residues responsible for substrate binding. These results indicate that the dimeric form is essential for the IPMDH to express enzymatic activity and that the close subunit contact at the hydrophobic core is important for the thermal stability of the enzyme.

Three-dimensional structure of a highly thermostable enzyme, 3-isopropylmalate dehydrogenase of Thermus thermophilus at 2.2 A resolution.,Imada K, Sato M, Tanaka N, Katsube Y, Matsuura Y, Oshima T J Mol Biol. 1991 Dec 5;222(3):725-38. PMID:1748999<ref>PMID:1748999</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 1ipd" style="background-color:#fffaf0;"></div>

==See Also==
*[[Isopropylmalate dehydrogenase|Isopropylmalate dehydrogenase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Flavobacterium thermophilum yoshida and oshima 1971]]
[[Category: 3-isopropylmalate dehydrogenase]]
[[Category: Large Structures]]
[[Category: Imada, K]]
[[Category: Katsube, Y]]
[[Category: Matsuura, Y]]
[[Category: Oshima, T]]
[[Category: Sato, M]]
[[Category: Tanaka, N]]
[[Category: Oxidoreductase]]