1eq2: Difference between revisions
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==THE CRYSTAL STRUCTURE OF ADP-L-GLYCERO-D-MANNOHEPTOSE 6-EPIMERASE== | ==THE CRYSTAL STRUCTURE OF ADP-L-GLYCERO-D-MANNOHEPTOSE 6-EPIMERASE== | ||
<StructureSection load='1eq2' size='340' side='right' caption='[[1eq2]], [[Resolution|resolution]] 2.00Å' scene=''> | <StructureSection load='1eq2' size='340' side='right'caption='[[1eq2]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1eq2]] is a 10 chain structure with sequence from [ | <table><tr><td colspan='2'>[[1eq2]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQ2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EQ2 FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2Å</td></tr> | ||
<tr id=' | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADQ:ADENOSINE-5-DIPHOSPHATE-GLUCOSE'>ADQ</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</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=1eq2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eq2 OCA], [https://pdbe.org/1eq2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eq2 RCSB], [https://www.ebi.ac.uk/pdbsum/1eq2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eq2 ProSAT]</span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/HLDD_ECOLI HLDD_ECOLI] Catalyzes the interconversion between ADP-D-glycero-beta-D-manno-heptose and ADP-L-glycero-beta-D-manno-heptose via an epimerization at carbon 6 of the heptose.<ref>PMID:6337148</ref> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eq/1eq2_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eq/1eq2_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/ | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
</jmolCheckbox> | </jmolCheckbox> | ||
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</div> | </div> | ||
<div class="pdbe-citations 1eq2" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1eq2" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Escherichia coli]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Coleman | [[Category: Coleman Jr WG]] | ||
[[Category: Deacon | [[Category: Deacon AM]] | ||
[[Category: Ealick | [[Category: Ealick SE]] | ||
[[Category: Ni | [[Category: Ni YS]] | ||
Latest revision as of 07:29, 17 October 2024
THE CRYSTAL STRUCTURE OF ADP-L-GLYCERO-D-MANNOHEPTOSE 6-EPIMERASETHE CRYSTAL STRUCTURE OF ADP-L-GLYCERO-D-MANNOHEPTOSE 6-EPIMERASE
Structural highlights
FunctionHLDD_ECOLI Catalyzes the interconversion between ADP-D-glycero-beta-D-manno-heptose and ADP-L-glycero-beta-D-manno-heptose via an epimerization at carbon 6 of the heptose.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBACKGROUND: ADP-L-glycero--mannoheptose 6-epimerase (AGME) is required for lipopolysaccharide (LPS) biosynthesis in most genera of pathogenic and non-pathogenic Gram-negative bacteria. It catalyzes the interconversion of ADP-D-glycero-D-mannoheptose and ADP-L-glycero-D-mannoheptose, a precursor of the seven-carbon sugar L-glycero-mannoheptose (heptose). Heptose is an obligatory component of the LPS core domain; its absence results in a truncated LPS structure resulting in susceptibility to hydrophobic antibiotics. Heptose is not found in mammalian cells, thus its biosynthetic pathway in bacteria presents a unique target for the design of novel antimicrobial agents. RESULTS: The structure of AGME, in complex with NADP and the catalytic inhibitor ADP-glucose, has been determined at 2.0 A resolution by multiwavelength anomalous diffraction (MAD) phasing methods. AGME is a homopentameric enzyme, which crystallizes with two pentamers in the asymmetric unit. The location of 70 crystallographically independent selenium sites was a key step in the structure determination process. Each monomer comprises two domains: a large N-terminal domain, consisting of a modified seven-stranded Rossmann fold that is associated with NADP binding; and a smaller alpha/beta C-terminal domain involved in substrate binding. CONCLUSIONS: The first structure of an LPS core biosynthetic enzyme leads to an understanding of the mechanism of the conversion between ADP-D-glycero--mannoheptose and ADP-L-glycero-D-mannoheptose. On the basis of its high structural similarity to UDP-galactose epimerase and the three-dimensional positions of the conserved residues Ser116, Tyr140 and Lys144, AGME was classified as a member of the short-chain dehydrogenase/reductase (SDR) superfamily. This study should prove useful in the design of mechanistic and structure-based inhibitors of the AGME catalyzed reaction. The crystal structure of ADP-L-glycero-D-mannoheptose 6-epimerase: catalysis with a twist.,Deacon AM, Ni YS, Coleman WG Jr, Ealick SE Structure. 2000 May 15;8(5):453-62. PMID:10896473[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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