View source for 1guz


==Structural Basis for Thermophilic Protein Stability: Structures of Thermophilic and Mesophilic Malate Dehydrogenases==
<StructureSection load='1guz' size='340' side='right'caption='[[1guz]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1guz]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Chlorobaculum_tepidum Chlorobaculum tepidum] and [https://en.wikipedia.org/wiki/Prosthecochloris_vibrioformis Prosthecochloris vibrioformis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GUZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1GUZ 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</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=1guz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1guz OCA], [https://pdbe.org/1guz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1guz RCSB], [https://www.ebi.ac.uk/pdbsum/1guz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1guz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MDH_CHLTE MDH_CHLTE] Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_00487][https://www.uniprot.org/uniprot/MDH_PROVB MDH_PROVB] Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_00487]
== 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/gu/1guz_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=1guz ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The three-dimensional structure of four malate dehydrogenases (MDH) from thermophilic and mesophilic phototropic bacteria have been determined by X-ray crystallography and the corresponding structures compared. In contrast to the dimeric quaternary structure of most MDHs, these MDHs are tetramers and are structurally related to tetrameric malate dehydrogenases from Archaea and to lactate dehydrogenases. The tetramers are dimers of dimers, where the structures of each subunit and the dimers are similar to the dimeric malate dehydrogenases. The difference in optimal growth temperature of the corresponding organisms is relatively small, ranging from 32 to 55 degrees C. Nevertheless, on the basis of the four crystal structures, a number of factors that are likely to contribute to the relative thermostability in the present series have been identified. It appears from the results obtained, that the difference in thermostability between MDH from the mesophilic Chlorobium vibrioforme on one hand and from the moderate thermophile Chlorobium tepidum on the other hand is mainly due to the presence of polar residues that form additional hydrogen bonds within each subunit. Furthermore, for the even more thermostable Chloroflexus aurantiacus MDH, the use of charged residues to form additional ionic interactions across the dimer-dimer interface is favored. This enzyme has a favorable intercalation of His-Trp as well as additional aromatic contacts at the monomer-monomer interface in each dimer. A structural alignment of tetrameric and dimeric prokaryotic MDHs reveal that structural elements that differ among dimeric and tetrameric MDHs are located in a few loop regions.

Structural basis for thermophilic protein stability: structures of thermophilic and mesophilic malate dehydrogenases.,Dalhus B, Saarinen M, Sauer UH, Eklund P, Johansson K, Karlsson A, Ramaswamy S, Bjork A, Synstad B, Naterstad K, Sirevag R, Eklund H J Mol Biol. 2002 May 3;318(3):707-21. PMID:12054817<ref>PMID:12054817</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 1guz" style="background-color:#fffaf0;"></div>

==See Also==
*[[Malate Dehydrogenase 3D structures|Malate Dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Chlorobaculum tepidum]]
[[Category: Large Structures]]
[[Category: Prosthecochloris vibrioformis]]
[[Category: Bjork A]]
[[Category: Dalhus B]]
[[Category: Eklund H]]
[[Category: Eklund P]]
[[Category: Johansson K]]
[[Category: Karlsson A]]
[[Category: Naterstad K]]
[[Category: Ramaswamy S]]
[[Category: Sarinen M]]
[[Category: Sauer UH]]
[[Category: Sirevag R]]
[[Category: Synstad B]]