3vw5: Difference between revisions
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==Crystal structure of sugar epimerase from ruminal bacterium== | |||
=== | <StructureSection load='3vw5' size='340' side='right' caption='[[3vw5]], [[Resolution|resolution]] 2.60Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3vw5]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Ruminococcus_albus Ruminococcus albus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VW5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3VW5 FirstGlance]. <br> | |||
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1264 Ruminococcus albus])</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cellobiose_epimerase Cellobiose epimerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.1.3.11 5.1.3.11] </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=3vw5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vw5 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3vw5 RCSB], [http://www.ebi.ac.uk/pdbsum/3vw5 PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Enzymatic epimerization is an important modification for carbohydrates to acquire diverse functions attributable to their stereoisomers. Cellobiose 2-epimerase (CE) catalyzes interconversion between d-glucose and d-mannose residues at the reducing end of beta-1,4-linked oligosaccharides. Here, we solved the structure of Ruminococcus albus CE (RaCE). The structure of RaCE showed strong similarity to those of N-acetyl-D-glucosamine 2-epimerase and aldose-ketose isomerase YihS with a high degree of conservation of residues around the catalytic center, although sequence identity between them is low. Based on structural comparison, we found that His184 is required for RaCE activity as the third histidine added to two essential histidines in other sugar epimerases/isomerases. This finding was confirmed by mutagenesis, suggesting a new catalytic mechanism for CE involving three histidines. | |||
Crystal structure of Ruminococcus albus cellobiose 2-epimerase: structural insights into epimerization of unmodified sugar.,Fujiwara T, Saburi W, Inoue S, Mori H, Matsui H, Tanaka I, Yao M FEBS Lett. 2013 Apr 2;587(7):840-6. doi: 10.1016/j.febslet.2013.02.007. Epub 2013, Feb 24. PMID:23462136<ref>PMID:23462136</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Cellobiose epimerase]] | [[Category: Cellobiose epimerase]] | ||
[[Category: Ruminococcus albus]] | [[Category: Ruminococcus albus]] | ||
[[Category: Fujiwara, T | [[Category: Fujiwara, T]] | ||
[[Category: Saburi, W | [[Category: Saburi, W]] | ||
[[Category: Tanaka, I | [[Category: Tanaka, I]] | ||
[[Category: Yao, M | [[Category: Yao, M]] | ||
[[Category: Carbohydrate/sugar binding]] | [[Category: Carbohydrate/sugar binding]] | ||
[[Category: Epimerase]] | [[Category: Epimerase]] | ||
[[Category: Epimerization]] | [[Category: Epimerization]] | ||
[[Category: Isomerase]] | [[Category: Isomerase]] | ||
Revision as of 10:29, 21 December 2014
Crystal structure of sugar epimerase from ruminal bacteriumCrystal structure of sugar epimerase from ruminal bacterium
Structural highlights
Publication Abstract from PubMedEnzymatic epimerization is an important modification for carbohydrates to acquire diverse functions attributable to their stereoisomers. Cellobiose 2-epimerase (CE) catalyzes interconversion between d-glucose and d-mannose residues at the reducing end of beta-1,4-linked oligosaccharides. Here, we solved the structure of Ruminococcus albus CE (RaCE). The structure of RaCE showed strong similarity to those of N-acetyl-D-glucosamine 2-epimerase and aldose-ketose isomerase YihS with a high degree of conservation of residues around the catalytic center, although sequence identity between them is low. Based on structural comparison, we found that His184 is required for RaCE activity as the third histidine added to two essential histidines in other sugar epimerases/isomerases. This finding was confirmed by mutagenesis, suggesting a new catalytic mechanism for CE involving three histidines. Crystal structure of Ruminococcus albus cellobiose 2-epimerase: structural insights into epimerization of unmodified sugar.,Fujiwara T, Saburi W, Inoue S, Mori H, Matsui H, Tanaka I, Yao M FEBS Lett. 2013 Apr 2;587(7):840-6. doi: 10.1016/j.febslet.2013.02.007. Epub 2013, Feb 24. PMID:23462136[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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