View source for 1pj2


==Crystal structure of human mitochondrial NAD(P)+-dependent malic enzyme in a pentary complex with natural substrate malate, cofactor NADH, Mn++, and allosteric activator fumarate==
<StructureSection load='1pj2' size='340' side='right'caption='[[1pj2]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1pj2]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PJ2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PJ2 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FUM:FUMARIC+ACID'>FUM</scene>, <scene name='pdbligand=LMR:(2S)-2-HYDROXYBUTANEDIOIC+ACID'>LMR</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=NAI:1,4-DIHYDRONICOTINAMIDE+ADENINE+DINUCLEOTIDE'>NAI</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=1pj2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pj2 OCA], [https://pdbe.org/1pj2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pj2 RCSB], [https://www.ebi.ac.uk/pdbsum/1pj2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pj2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MAOM_HUMAN MAOM_HUMAN] 
== 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/pj/1pj2_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=1pj2 ConSurf].
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== Publication Abstract from PubMed ==
Malic enzymes catalyze the oxidative decarboxylation of L-malate to pyruvate and CO(2) with the reduction of the NAD(P)(+) cofactor in the presence of divalent cations. We report the crystal structures at up to 2.1 A resolution of human mitochondrial NAD(P)(+)-dependent malic enzyme in different pentary complexes with the natural substrate malate or pyruvate, the dinucleotide cofactor NAD(+) or NADH, the divalent cation Mn(2+), and the allosteric activator fumarate. Malate is bound deep in the active site, providing two ligands for the cation, and its C4 carboxylate group is out of plane with the C1-C2-C3 atoms, facilitating decarboxylation. The divalent cation is positioned optimally to catalyze the entire reaction. Lys183 is the general base for the oxidation step, extracting the proton from the C2 hydroxyl of malate. Tyr112-Lys183 functions as the general acid-base pair to catalyze the tautomerization of the enolpyruvate product from decarboxylation to pyruvate.

Crystal structures of substrate complexes of malic enzyme and insights into the catalytic mechanism.,Tao X, Yang Z, Tong L Structure. 2003 Sep;11(9):1141-50. PMID:12962632<ref>PMID:12962632</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 1pj2" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Tao X]]
[[Category: Tong L]]
[[Category: Yang Z]]