3dr4
From Proteopedia
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| - | [[ | + | ==GDP-perosamine synthase K186A mutant from Caulobacter crescentus with bound sugar ligand== |
| + | <StructureSection load='3dr4' size='340' side='right' caption='[[3dr4]], [[Resolution|resolution]] 1.60Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[3dr4]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Caulobacter_vibrioides Caulobacter vibrioides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DR4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3DR4 FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=G4M:[(2R,3S,4R,5R)-5-(2-AMINO-6-OXO-1,6-DIHYDRO-9H-PURIN-9-YL)-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL]METHYL+(2R,3S,4S,5S,6R)-3,4-DIHYDROXY-5-[({3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYL)AMINO]-6-METHYLTETRAHYDRO-2H-PYRAN-2-YL+DIHYDROGEN+DIPHOSPHATE'>G4M</scene></td></tr> | ||
| + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bn1|3bn1]], [[3dr7|3dr7]]</td></tr> | ||
| + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">per ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=155892 Caulobacter vibrioides])</td></tr> | ||
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3dr4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3dr4 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3dr4 RCSB], [http://www.ebi.ac.uk/pdbsum/3dr4 PDBsum]</span></td></tr> | ||
| + | </table> | ||
| + | == 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/dr/3dr4_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/chain_selection.php?pdb_ID=2ata ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Perosamine (4-amino-4,6-dideoxy- d-mannose), or its N-acetylated form, is one of several dideoxy sugars found in the O-antigens of such infamous Gram-negative bacteria as Vibrio cholerae O1 and Escherichia coli O157:H7. It is added to the bacterial O-antigen via a nucleotide-linked version, namely GDP-perosamine. Three enzymes are required for the biosynthesis of GDP-perosamine starting from mannose 1-phosphate. The focus of this investigation is GDP-perosamine synthase from Caulobacter crescentus, which catalyzes the final step in GDP-perosamine synthesis, the conversion of GDP-4-keto-6-deoxymannose to GDP-perosamine. The enzyme is PLP-dependent and belongs to the aspartate aminotransferase superfamily. It contains the typically conserved active site lysine residue, which forms a Schiff base with the PLP cofactor. Two crystal structures were determined for this investigation: a site-directed mutant protein (K186A) complexed with GDP-perosamine and the wild-type enzyme complexed with an unnatural ligand, GDP-3-deoxyperosamine. These structures, determined to 1.6 and 1.7 A resolution, respectively, revealed the manner in which products, and presumably substrates, are accommodated within the active site pocket of GDP-perosamine synthase. Additional kinetic analyses using both the natural and unnatural substrates revealed that the K m for the unnatural substrate was unperturbed relative to that of the natural substrate, but the k cat was lowered by a factor of approximately 200. Taken together, these studies shed light on why GDP-perosamine synthase functions as an aminotransferase whereas another very similar PLP-dependent enzyme, GDP-4-keto-6-deoxy- d-mannose 3-dehydratase or ColD, catalyzes a dehydration reaction using the same substrate. | ||
| - | + | Accommodation of GDP-linked sugars in the active site of GDP-perosamine synthase.,Cook PD, Carney AE, Holden HM Biochemistry. 2008 Oct 7;47(40):10685-93. Epub 2008 Sep 17. PMID:18795799<ref>PMID:18795799</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
| - | + | == References == | |
| - | + | <references/> | |
| - | + | __TOC__ | |
| - | + | </StructureSection> | |
| - | + | ||
| - | == | + | |
| - | < | + | |
[[Category: Caulobacter vibrioides]] | [[Category: Caulobacter vibrioides]] | ||
| - | [[Category: Carney, A E | + | [[Category: Carney, A E]] |
| - | [[Category: Cook, P D | + | [[Category: Cook, P D]] |
| - | [[Category: Holden, H M | + | [[Category: Holden, H M]] |
[[Category: Aspartate aminotransferase]] | [[Category: Aspartate aminotransferase]] | ||
[[Category: Deoxysugar]] | [[Category: Deoxysugar]] | ||
Revision as of 08:07, 12 November 2014
GDP-perosamine synthase K186A mutant from Caulobacter crescentus with bound sugar ligand
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