View source for 2a85


==Crystal Structure of the G81A mutant of the Active Chimera of (S)-Mandelate Dehydrogenase in complex with its substrate 2-hydroxyoctanoate==
<StructureSection load='2a85' size='340' side='right'caption='[[2a85]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2a85]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_putida Pseudomonas putida] and [https://en.wikipedia.org/wiki/Spinacia_oleracea Spinacia oleracea]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A85 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2A85 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=HOC:(2S)-2-HYDROXYOCTANOIC+ACID'>HOC</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</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=2a85 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2a85 OCA], [https://pdbe.org/2a85 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2a85 RCSB], [https://www.ebi.ac.uk/pdbsum/2a85 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2a85 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MDLB_PSEPU MDLB_PSEPU] Reduction of (S)-mandelate to benzoylformate.[https://www.uniprot.org/uniprot/GOX_SPIOL GOX_SPIOL] 
== 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/a8/2a85_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=2a85 ConSurf].
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== Publication Abstract from PubMed ==
(S)-Mandelate dehydrogenase (MDH) from Pseudomonas putida, a membrane-associated flavoenzyme, catalyzes the oxidation of (S)-mandelate to benzoylformate. Previously, the structure of a catalytically similar chimera, MDH-GOX2, rendered soluble by the replacement of its membrane-binding segment with the corresponding segment of glycolate oxidase (GOX), was determined and found to be highly similar to that of GOX except within the substituted segments. Subsequent attempts to cocrystallize MDH-GOX2 with substrate proved unsuccessful. However, the G81A mutants of MDH and of MDH-GOX2 displayed approximately 100-fold lower reactivity with substrate and a modestly higher reactivity towards molecular oxygen. In order to understand the effect of the mutation and to identify the mode of substrate binding in MDH-GOX2, a crystallographic investigation of the G81A mutant of the MDH-GOX2 enzyme was initiated. The structures of ligand-free G81A mutant MDH-GOX2 and of its complexes with the substrates 2-hydroxyoctanoate and 2-hydroxy-3-indolelactate were determined at 1.6, 2.5 and 2.2 A resolution, respectively. In the ligand-free G81A mutant protein, a sulfate anion previously found at the active site is displaced by the alanine side chain introduced by the mutation. 2-Hydroxyoctanoate binds in an apparently productive mode for subsequent reaction, while 2-hydroxy-3-indolelactate is bound to the enzyme in an apparently unproductive mode. The results of this investigation suggest that a lowering of the polarity of the flavin environment resulting from the displacement of nearby water molecules caused by the glycine-to-alanine mutation may account for the lowered catalytic activity of the mutant enzyme, which is consistent with the 30 mV lower flavin redox potential. Furthermore, the altered binding mode of the indolelactate substrate may account for its reduced activity compared with octanoate, as observed in the crystalline state.

Structures of the G81A mutant form of the active chimera of (S)-mandelate dehydrogenase and its complex with two of its substrates.,Sukumar N, Dewanti A, Merli A, Rossi GL, Mitra B, Mathews FS Acta Crystallogr D Biol Crystallogr. 2009 Jun;65(Pt 6):543-52. Epub 2009, May 15. PMID:19465768<ref>PMID:19465768</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Mandelate dehydrogenase|Mandelate dehydrogenase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudomonas putida]]
[[Category: Spinacia oleracea]]
[[Category: Mathews FS]]
[[Category: Mitra B]]
[[Category: Sukumar N]]
[[Category: Xu Y]]