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[[Image:1kew.jpg|left|200px]]
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{{STRUCTURE_1kew|  PDB=1kew  |  SCENE=  }}
'''The crystal structure of dTDP-D-glucose 4,6-dehydratase (RmlB) from Salmonella enterica serovar Typhimurium with thymidine diphosphate bound'''


==The crystal structure of dTDP-D-glucose 4,6-dehydratase (RmlB) from Salmonella enterica serovar Typhimurium with thymidine diphosphate bound==
<StructureSection load='1kew' size='340' side='right'caption='[[1kew]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1kew]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_Typhimurium Salmonella enterica subsp. enterica serovar Typhimurium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KEW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KEW 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]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=TYD:THYMIDINE-5-DIPHOSPHATE'>TYD</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=1kew FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kew OCA], [https://pdbe.org/1kew PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kew RCSB], [https://www.ebi.ac.uk/pdbsum/1kew PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kew ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RMLB_SALTY RMLB_SALTY] Catalyzes the dehydration of dTDP-D-glucose to form dTDP-6-deoxy-D-xylo-4-hexulose via a three-step process involving oxidation, dehydration and reduction.<ref>PMID:11796113</ref>
== 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/ke/1kew_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=1kew ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
dTDP-D-glucose 4,6-dehydratase (RmlB) was first identified in the L-rhamnose biosynthetic pathway, where it catalyzes the conversion of dTDP-D-glucose into dTDP-4-keto-6-deoxy-D-glucose. The structures of RmlB from Salmonella enterica serovar Typhimurium in complex with substrate deoxythymidine 5'-diphospho-D-glucose (dTDP-D-glucose) and deoxythymidine 5'-diphosphate (dTDP), and RmlB from Streptococcus suis serotype 2 in complex with dTDP-D-glucose, dTDP, and deoxythymidine 5'-diphospho-D-pyrano-xylose (dTDP-xylose) have all been solved at resolutions between 1.8 A and 2.4 A. The structures show that the active sites are highly conserved. Importantly, the structures show that the active site tyrosine functions directly as the active site base, and an aspartic and glutamic acid pairing accomplishes the dehydration step of the enzyme mechanism. We conclude that the substrate is required to move within the active site to complete the catalytic cycle and that this movement is driven by the elimination of water. The results provide insight into members of the SDR superfamily.


==Overview==
Toward a structural understanding of the dehydratase mechanism.,Allard ST, Beis K, Giraud MF, Hegeman AD, Gross JW, Wilmouth RC, Whitfield C, Graninger M, Messner P, Allen AG, Maskell DJ, Naismith JH Structure. 2002 Jan;10(1):81-92. PMID:11796113<ref>PMID:11796113</ref>
dTDP-D-glucose 4,6-dehydratase (RmlB) was first identified in the L-rhamnose biosynthetic pathway, where it catalyzes the conversion of dTDP-D-glucose into dTDP-4-keto-6-deoxy-D-glucose. The structures of RmlB from Salmonella enterica serovar Typhimurium in complex with substrate deoxythymidine 5'-diphospho-D-glucose (dTDP-D-glucose) and deoxythymidine 5'-diphosphate (dTDP), and RmlB from Streptococcus suis serotype 2 in complex with dTDP-D-glucose, dTDP, and deoxythymidine 5'-diphospho-D-pyrano-xylose (dTDP-xylose) have all been solved at resolutions between 1.8 A and 2.4 A. The structures show that the active sites are highly conserved. Importantly, the structures show that the active site tyrosine functions directly as the active site base, and an aspartic and glutamic acid pairing accomplishes the dehydration step of the enzyme mechanism. We conclude that the substrate is required to move within the active site to complete the catalytic cycle and that this movement is driven by the elimination of water. The results provide insight into members of the SDR superfamily.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1KEW is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_typhimurium Salmonella enterica subsp. enterica serovar typhimurium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KEW OCA].
</div>
<div class="pdbe-citations 1kew" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Toward a structural understanding of the dehydratase mechanism., Allard ST, Beis K, Giraud MF, Hegeman AD, Gross JW, Wilmouth RC, Whitfield C, Graninger M, Messner P, Allen AG, Maskell DJ, Naismith JH, Structure. 2002 Jan;10(1):81-92. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11796113 11796113]
*[[DTDP-glucose 4%2C6-dehydratase|DTDP-glucose 4%2C6-dehydratase]]
[[Category: Salmonella enterica subsp. enterica serovar typhimurium]]
== References ==
[[Category: Single protein]]
<references/>
[[Category: DTDP-glucose 4,6-dehydratase]]
__TOC__
[[Category: Allard, S T.M.]]
</StructureSection>
[[Category: Allen, A G.]]
[[Category: Large Structures]]
[[Category: Beis, K.]]
[[Category: Salmonella enterica subsp. enterica serovar Typhimurium]]
[[Category: Giraud, M F.]]
[[Category: Allard STM]]
[[Category: Graninger, M.]]
[[Category: Allen AG]]
[[Category: Gross, J W.]]
[[Category: Beis K]]
[[Category: Hegeman, A D.]]
[[Category: Giraud M-F]]
[[Category: Messner, P.]]
[[Category: Graninger M]]
[[Category: Naismith, J H.]]
[[Category: Gross JW]]
[[Category: Whitfield, C.]]
[[Category: Hegeman AD]]
[[Category: Rossmann fold]]
[[Category: Messner P]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 22:39:35 2008''
[[Category: Naismith JH]]
[[Category: Whitfield C]]

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