1g1a

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[[Image:1g1a.png|left|200px]]
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==THE CRYSTAL STRUCTURE OF DTDP-D-GLUCOSE 4,6-DEHYDRATASE (RMLB)FROM SALMONELLA ENTERICA SEROVAR TYPHIMURIUM==
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<StructureSection load='1g1a' size='340' side='right' caption='[[1g1a]], [[Resolution|resolution]] 2.47&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1g1a]] is a 4 chain structure with 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=1G1A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1G1A FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">RMLB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=90371 Salmonella enterica subsp. enterica serovar Typhimurium])</td></tr>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/dTDP-glucose_4,6-dehydratase dTDP-glucose 4,6-dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.46 4.2.1.46] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1g1a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g1a OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1g1a RCSB], [http://www.ebi.ac.uk/pdbsum/1g1a PDBsum]</span></td></tr>
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<table>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/g1/1g1a_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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l-Rhamnose is a 6-deoxyhexose that is found in a variety of different glycoconjugates in the cell walls of pathogenic bacteria. The precursor of l-rhamnose is dTDP-l-rhamnose, which is synthesised from glucose- 1-phosphate and deoxythymidine triphosphate (dTTP) via a pathway requiring four enzymes. Significantly this pathway does not exist in humans and all four enzymes therefore represent potential therapeutic targets. dTDP-D-glucose 4,6-dehydratase (RmlB; EC 4.2.1.46) is the second enzyme in the dTDP-L-rhamnose biosynthetic pathway. The structure of Salmonella enterica serovar Typhimurium RmlB had been determined to 2.47 A resolution with its cofactor NAD(+) bound. The structure has been refined to a crystallographic R-factor of 20.4 % and an R-free value of 24.9 % with good stereochemistry.RmlB functions as a homodimer with monomer association occurring principally through hydrophobic interactions via a four-helix bundle. Each monomer exhibits an alpha/beta structure that can be divided into two domains. The larger N-terminal domain binds the nucleotide cofactor NAD(+) and consists of a seven-stranded beta-sheet surrounded by alpha-helices. The smaller C-terminal domain is responsible for binding the sugar substrate dTDP-d-glucose and contains four beta-strands and six alpha-helices. The two domains meet to form a cavity in the enzyme. The highly conserved active site Tyr(167)XXXLys(171) catalytic couple and the GlyXGlyXXGly motif at the N terminus characterise RmlB as a member of the short-chain dehydrogenase/reductase extended family.The quaternary structure of RmlB and its similarity to a number of other closely related short-chain dehydrogenase/reductase enzymes have enabled us to propose a mechanism of catalysis for this important enzyme.
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{{STRUCTURE_1g1a| PDB=1g1a | SCENE= }}
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The crystal structure of dTDP-D-Glucose 4,6-dehydratase (RmlB) from Salmonella enterica serovar Typhimurium, the second enzyme in the dTDP-l-rhamnose pathway.,Allard ST, Giraud MF, Whitfield C, Graninger M, Messner P, Naismith JH J Mol Biol. 2001 Mar 16;307(1):283-95. PMID:11243820<ref>PMID:11243820</ref>
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===THE CRYSTAL STRUCTURE OF DTDP-D-GLUCOSE 4,6-DEHYDRATASE (RMLB)FROM SALMONELLA ENTERICA SEROVAR TYPHIMURIUM===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_11243820}}
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== References ==
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<references/>
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==About this Structure==
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__TOC__
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[[1g1a]] is a 4 chain structure with 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=1G1A OCA].
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</StructureSection>
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==Reference==
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<ref group="xtra">PMID:011243820</ref><references group="xtra"/>
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[[Category: Salmonella enterica subsp. enterica serovar typhimurium]]
[[Category: Salmonella enterica subsp. enterica serovar typhimurium]]
[[Category: DTDP-glucose 4,6-dehydratase]]
[[Category: DTDP-glucose 4,6-dehydratase]]

Revision as of 12:33, 28 September 2014

THE CRYSTAL STRUCTURE OF DTDP-D-GLUCOSE 4,6-DEHYDRATASE (RMLB)FROM SALMONELLA ENTERICA SEROVAR TYPHIMURIUM

1g1a, resolution 2.47Å

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