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4ba0
From Proteopedia
(Difference between revisions)
(New page: '''Unreleased structure''' The entry 4ba0 is ON HOLD Authors: Larsbrink, J., Izumi, A., Hemsworth, G.R., Davies, G.J., Brumer, H. Description: Crystal Structure of Agd31B, alpha-transg...) |
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| - | '''Unreleased structure''' | ||
| - | + | ==Crystal Structure of Agd31B, alpha-transglucosylase, complexed with 5F-alpha-GlcF== | |
| + | <StructureSection load='4ba0' size='340' side='right'caption='[[4ba0]], [[Resolution|resolution]] 1.85Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[4ba0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Cellvibrio_japonicus Cellvibrio japonicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4BA0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4BA0 FirstGlance]. <br> | ||
| + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.85Å</td></tr> | ||
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5GF:5-FLUORO-BETA-D-GLUCOPYRANOSE'>5GF</scene>, <scene name='pdbligand=ARG:ARGININE'>ARG</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=4ba0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ba0 OCA], [https://pdbe.org/4ba0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ba0 RCSB], [https://www.ebi.ac.uk/pdbsum/4ba0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ba0 ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/OL4AG_CELJU OL4AG_CELJU] Alpha-transglucosylase that specifically transfers single glucosyl units from alpha(1->4)-glucans to the non-reducing terminal 4-OH of glucose and alpha(1->4)- and alpha(1->6)-linked glucosyl residues. Acts on amylose, amylopectin, glycogen and maltooligosaccharides, with the highest activity with maltotriose as a donor, and also accepts maltose. Does not act as a hydrolase: weak hydrolysis activity is only observed on the disaccharide maltose.<ref>PMID:23132856</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The metabolism of the storage polysaccharides glycogen and starch are of vital importance to organisms from all domains of life. In bacteria, utilization of these alpha-glucans requires the concerted action of a variety of enzymes, including glycoside hydrolases, glycoside phosphorylases, and transglycosylases. In particular, transglycosylases from glycoside hydrolase families GH13 and GH77 play well-established roles in alpha-glucan sidechain (de)branching, regulation of oligo- and polysaccharide chain length, and formation of cyclic dextrans. Here, we present the biochemical and tertiary structural characterization of a new type of bacterial 1,4-alpha-glucan 4-alpha-glucosyltransferase from glycoside hydrolase family 31 (GH31). Distinct from 1,4-alpha-glucan 6-alpha-glucosyltransferases (EC 2.4.1.24) and 4-alpha-glucanotransferases (EC 2.4.1.25), this enzyme strictly transferred one glucosyl residue from alpha(1 -->4) glucans in disproportionation reactions. Substrate hydrolysis was undetectable for a series of malto-oligosaccharides, except maltose, for which transglycosylation nonetheless dominated across a range of substrate concentrations. Crystallographic analysis of the enzyme in apo, acarbose-complexed, and trapped 5-beta-fluoroglucosyl-enzyme intermediate forms revealed extended substrate interactions across one negative and up to three positive subsites, thus providing structural rationalization for the unique, single-monosaccharide transferase activity of the enzyme. | ||
| - | + | Structural enzymology of Cellvibrio japonicus Agd31B reveals alpha-transglucosylase activity in glycoside hydrolase family 31.,Larsbrink J, Izumi A, Hemsworth GR, Davies GJ, Brumer H J Biol Chem. 2012 Nov 6. PMID:23132856<ref>PMID:23132856</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| + | </div> | ||
| + | <div class="pdbe-citations 4ba0" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Cellvibrio japonicus]] | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Brumer H]] | ||
| + | [[Category: Davies GJ]] | ||
| + | [[Category: Hemsworth GR]] | ||
| + | [[Category: Izumi A]] | ||
| + | [[Category: Larsbrink J]] | ||
Current revision
Crystal Structure of Agd31B, alpha-transglucosylase, complexed with 5F-alpha-GlcF
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