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==The crystal structure of the D307A mutant of glycoside HYDROLASE (FAMILY 31) from Ruminococcus obeum ATCC 29174 in complex with isomaltose== | |||
<StructureSection load='3mkk' size='340' side='right' caption='[[3mkk]], [[Resolution|resolution]] 1.91Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3mkk]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Ruminococcus_obeum_atcc_29174 Ruminococcus obeum atcc 29174]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MKK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3MKK FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3ffj|3ffj]], [[3m46|3m46]], [[3m6d|3m6d]]</td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">RUMOBE_03919 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=411459 Ruminococcus obeum ATCC 29174])</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=3mkk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mkk OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3mkk RCSB], [http://www.ebi.ac.uk/pdbsum/3mkk 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/mk/3mkk_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 == | |||
The human intestine harbors a large number of microbes forming a complex microbial community that greatly affects the physiology and pathology of the host. In the human gut microbiome, the enrichment in certain protein gene families appears to be widespread. They include enzymes involved in carbohydrate metabolism such as glucoside hydrolases of dietary polysaccharides and glycoconjugates. We report the crystal structures (wild type, 2 mutants, and a mutant/substrate complex) and the enzymatic activity of a recombinant alpha-glucosidase from human gut bacterium Ruminococcus obeum. The first ever protein structures from this bacterium reveal a structural homologue to human intestinal maltase-glucoamylase with a highly conserved catalytic domain and reduced auxiliary domains. The alpha-glucosidase, a member of GH31 family, shows substrate preference for alpha(1-6) over alpha(1-4) glycosidic linkages and produces glucose from isomaltose as well as maltose. The preference can be switched by a single mutation at its active site, suggestive of widespread adaptation to utilization of a variety of polysaccharides by intestinal micro-organisms as energy resources. | |||
Novel alpha-glucosidase from human gut microbiome: substrate specificities and their switch.,Tan K, Tesar C, Wilton R, Keigher L, Babnigg G, Joachimiak A FASEB J. 2010 Oct;24(10):3939-49. Epub 2010 Jun 25. PMID:20581222<ref>PMID:20581222</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Ruminococcus obeum atcc 29174]] | [[Category: Ruminococcus obeum atcc 29174]] | ||
[[Category: Babnigg, G | [[Category: Babnigg, G]] | ||
[[Category: Freeman, L | [[Category: Freeman, L]] | ||
[[Category: Joachimiak, A | [[Category: Joachimiak, A]] | ||
[[Category: | [[Category: Structural genomic]] | ||
[[Category: Tan, K | [[Category: Tan, K]] | ||
[[Category: Tesar, C | [[Category: Tesar, C]] | ||
[[Category: Hydrolase]] | [[Category: Hydrolase]] | ||
[[Category: Isomaltose]] | [[Category: Isomaltose]] | ||
[[Category: Mcsg]] | [[Category: Mcsg]] | ||
[[Category: | [[Category: PSI, Protein structure initiative]] | ||
[[Category: Structural complex]] | [[Category: Structural complex]] | ||
Revision as of 20:13, 18 December 2014
The crystal structure of the D307A mutant of glycoside HYDROLASE (FAMILY 31) from Ruminococcus obeum ATCC 29174 in complex with isomaltoseThe crystal structure of the D307A mutant of glycoside HYDROLASE (FAMILY 31) from Ruminococcus obeum ATCC 29174 in complex with isomaltose
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 PubMedThe human intestine harbors a large number of microbes forming a complex microbial community that greatly affects the physiology and pathology of the host. In the human gut microbiome, the enrichment in certain protein gene families appears to be widespread. They include enzymes involved in carbohydrate metabolism such as glucoside hydrolases of dietary polysaccharides and glycoconjugates. We report the crystal structures (wild type, 2 mutants, and a mutant/substrate complex) and the enzymatic activity of a recombinant alpha-glucosidase from human gut bacterium Ruminococcus obeum. The first ever protein structures from this bacterium reveal a structural homologue to human intestinal maltase-glucoamylase with a highly conserved catalytic domain and reduced auxiliary domains. The alpha-glucosidase, a member of GH31 family, shows substrate preference for alpha(1-6) over alpha(1-4) glycosidic linkages and produces glucose from isomaltose as well as maltose. The preference can be switched by a single mutation at its active site, suggestive of widespread adaptation to utilization of a variety of polysaccharides by intestinal micro-organisms as energy resources. Novel alpha-glucosidase from human gut microbiome: substrate specificities and their switch.,Tan K, Tesar C, Wilton R, Keigher L, Babnigg G, Joachimiak A FASEB J. 2010 Oct;24(10):3939-49. Epub 2010 Jun 25. PMID:20581222[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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