2jkp: Difference between revisions
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==Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with castanospermine== | |||
<StructureSection load='2jkp' size='340' side='right' caption='[[2jkp]], [[Resolution|resolution]] 1.99Å' scene=''> | <StructureSection load='2jkp' size='340' side='right' caption='[[2jkp]], [[Resolution|resolution]] 1.99Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2jke|2jke]], [[2jka|2jka]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2jke|2jke]], [[2jka|2jka]]</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-glucosidase Alpha-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.20 3.2.1.20] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-glucosidase Alpha-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.20 3.2.1.20] </span></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=2jkp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jkp OCA], [http://pdbe.org/2jkp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2jkp RCSB], [http://www.ebi.ac.uk/pdbsum/2jkp PDBsum]</span></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=2jkp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jkp OCA], [http://pdbe.org/2jkp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2jkp RCSB], [http://www.ebi.ac.uk/pdbsum/2jkp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2jkp ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/jk/2jkp_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/jk/2jkp_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
Revision as of 10:09, 11 July 2018
Structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with castanospermineStructure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron in complex with castanospermine
Structural highlights
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 PubMedEnzymatic cleavage of the glycosidic bond yields products in which the anomeric configuration is either retained or inverted. Each mechanism reflects the dispositions of the enzyme functional groups; a facet of which is essentially conserved in 113 glycoside hydrolase (GH) families. We show that family GH97 has diverged significantly, as it contains both inverting and retaining alpha-glycosidases. This reflects evolution of the active center; a glutamate acts as a general base in inverting members, exemplified by Bacteroides thetaiotaomicron alpha-glucosidase BtGH97a, whereas an aspartate likely acts as a nucleophile in retaining members. The structure of BtGH97a and its complexes with inhibitors, coupled to kinetic analysis of active-site variants, reveals an unusual calcium ion dependence. 1H NMR analysis shows an inversion mechanism for BtGH97a, whereas another GH97 enzyme from B. thetaiotaomicron, BtGH97b, functions as a retaining alpha-galactosidase. Divergence of catalytic mechanism within a glycosidase family provides insight into evolution of carbohydrate metabolism by human gut flora.,Gloster TM, Turkenburg JP, Potts JR, Henrissat B, Davies GJ Chem Biol. 2008 Oct 20;15(10):1058-67. Epub 2008 Oct 9. PMID:18848471[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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