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[[Image:2cmd.gif|left|200px]]


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==THE CRYSTAL STRUCTURE OF E.COLI MALATE DEHYDROGENASE: A COMPLEX OF THE APOENZYME AND CITRATE AT 1.87 ANGSTROMS RESOLUTION==
The line below this paragraph, containing "STRUCTURE_2cmd", creates the "Structure Box" on the page.
<StructureSection load='2cmd' size='340' side='right'caption='[[2cmd]], [[Resolution|resolution]] 1.87&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[2cmd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CMD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2CMD FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.87&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene></td></tr>
{{STRUCTURE_2cmd|  PDB=2cmd |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2cmd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2cmd OCA], [https://pdbe.org/2cmd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2cmd RCSB], [https://www.ebi.ac.uk/pdbsum/2cmd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2cmd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MDH_ECOLI MDH_ECOLI] Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_01516]
== 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/cm/2cmd_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=2cmd ConSurf].
<div style="clear:both"></div>


'''THE CRYSTAL STRUCTURE OF E.COLI MALATE DEHYDROGENASE: A COMPLEX OF THE APOENZYME AND CITRATE AT 1.87 ANGSTROMS RESOLUTION'''
==See Also==
 
*[[Malate Dehydrogenase 3D structures|Malate Dehydrogenase 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
The crystal structure of malate dehydrogenase from Escherichia coli has been determined with a resulting R-factor of 0.187 for X-ray data from 8.0 to 1.87 A. Molecular replacement, using the partially refined structure of porcine mitochondrial malate dehydrogenase as a probe, provided initial phases. The structure of this prokaryotic enzyme is closely homologous with the mitochondrial enzyme but somewhat less similar to cytosolic malate dehydrogenase from eukaryotes. However, all three enzymes are dimeric and form the subunit-subunit interface through similar surface regions. A citrate ion, found in the active site, helps define the residues involved in substrate binding and catalysis. Two arginine residues, R81 and R153, interacting with the citrate are believed to confer substrate specificity. The hydroxyl of the citrate is hydrogen-bonded to a histidine, H177, and similar interactions could be assigned to a bound malate or oxaloacetate. Histidine 177 is also hydrogen-bonded to an aspartate, D150, to form a classic His.Asp pair. Studies of the active site cavity indicate that the bound citrate would occupy part of the site needed for the coenzyme. In a model building study, the cofactor, NAD, was placed into the coenzyme site which exists when the citrate was converted to malate and crystallographic water molecules removed. This hypothetical model of a ternary complex was energy minimized for comparison with the structure of the binary complex of porcine cytosolic malate dehydrogenase. Many residues involved in cofactor binding in the minimized E. coli malate dehydrogenase structure are homologous to coenzyme binding residues in cytosolic malate dehydrogenase. In the energy minimized structure of the ternary complex, the C-4 atom of NAD is in van der Waals' contact with the C-3 atom of the malate. A catalytic cycle involves hydride transfer between these two atoms.
 
==About this Structure==
2CMD is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CMD OCA].
 
==Reference==
Crystal structure of Escherichia coli malate dehydrogenase. A complex of the apoenzyme and citrate at 1.87 A resolution., Hall MD, Levitt DG, Banaszak LJ, J Mol Biol. 1992 Aug 5;226(3):867-82. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1507230 1507230]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Malate dehydrogenase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Banaszak LJ]]
[[Category: Banaszak, L J.]]
[[Category: Hall MD]]
[[Category: Hall, M D.]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 22:30:19 2008''

Latest revision as of 12:18, 14 February 2024

THE CRYSTAL STRUCTURE OF E.COLI MALATE DEHYDROGENASE: A COMPLEX OF THE APOENZYME AND CITRATE AT 1.87 ANGSTROMS RESOLUTIONTHE CRYSTAL STRUCTURE OF E.COLI MALATE DEHYDROGENASE: A COMPLEX OF THE APOENZYME AND CITRATE AT 1.87 ANGSTROMS RESOLUTION

Structural highlights

2cmd is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.87Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MDH_ECOLI Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_01516]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

2cmd, resolution 1.87Å

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