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| | <StructureSection load='4b9z' size='340' side='right'caption='[[4b9z]], [[Resolution|resolution]] 2.00Å' scene=''> | | <StructureSection load='4b9z' size='340' side='right'caption='[[4b9z]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4b9z]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4B9Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4B9Z FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4b9z]] 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=4B9Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4B9Z FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=OXL:OXALATE+ION'>OXL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </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='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=AC1:6-METHYL-5-(4,5,6-TRIHYDROXY-3-HYDROXYMETHYL-CYCLOHEX-2-ENYLAMINO)-TETRAHYDRO-PYRAN-2,3,4-TRIOL'>AC1</scene></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AC1:6-METHYL-5-(4,5,6-TRIHYDROXY-3-HYDROXYMETHYL-CYCLOHEX-2-ENYLAMINO)-TETRAHYDRO-PYRAN-2,3,4-TRIOL'>AC1</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=OXL:OXALATE+ION'>OXL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PRD_900007:alpha-acarbose'>PRD_900007</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[4b9y|4b9y]], [[4ba0|4ba0]]</div></td></tr> | + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Alpha-glucosidase Alpha-glucosidase], with EC number [https://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'>[https://proteopedia.org/fgij/fg.htm?mol=4b9z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b9z OCA], [https://pdbe.org/4b9z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4b9z RCSB], [https://www.ebi.ac.uk/pdbsum/4b9z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4b9z ProSAT]</span></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=4b9z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b9z OCA], [https://pdbe.org/4b9z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4b9z RCSB], [https://www.ebi.ac.uk/pdbsum/4b9z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4b9z ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == 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>
| + | [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;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Alpha-glucosidase]] | + | [[Category: Cellvibrio japonicus]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Brumer, H]] | + | [[Category: Brumer H]] |
| - | [[Category: Davies, G J]] | + | [[Category: Davies GJ]] |
| - | [[Category: Hemsworth, G R]] | + | [[Category: Hemsworth GR]] |
| - | [[Category: Izumi, A]] | + | [[Category: Izumi A]] |
| - | [[Category: Larsbrink, J]] | + | [[Category: Larsbrink J]] |
| - | [[Category: Hydrolase]]
| + | |
| Structural highlights
4b9z is a 1 chain structure with sequence from Cellvibrio japonicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 2Å |
| Ligands: | , , , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
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.[1]
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[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Larsbrink J, Izumi A, Hemsworth GR, Davies GJ, Brumer H. Structural enzymology of Cellvibrio japonicus Agd31B reveals alpha-transglucosylase activity in glycoside hydrolase family 31. J Biol Chem. 2012 Nov 6. PMID:23132856 doi:http://dx.doi.org/10.1074/jbc.M112.416511
- ↑ Larsbrink J, Izumi A, Hemsworth GR, Davies GJ, Brumer H. Structural enzymology of Cellvibrio japonicus Agd31B reveals alpha-transglucosylase activity in glycoside hydrolase family 31. J Biol Chem. 2012 Nov 6. PMID:23132856 doi:http://dx.doi.org/10.1074/jbc.M112.416511
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