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| | ==Crystal structure of a mutant beta-glucosidase in wheat complexed with DIMBOA-Glc== | | ==Crystal structure of a mutant beta-glucosidase in wheat complexed with DIMBOA-Glc== |
| - | <StructureSection load='3ais' size='340' side='right' caption='[[3ais]], [[Resolution|resolution]] 2.20Å' scene=''> | + | <StructureSection load='3ais' size='340' side='right'caption='[[3ais]], [[Resolution|resolution]] 2.20Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3ais]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Canadian_hard_winter_wheat Canadian hard winter wheat]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AIS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3AIS FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3ais]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Triticum_aestivum Triticum aestivum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AIS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AIS 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=HBK:(2S)-2,4-DIHYDROXY-7-METHOXY-2H-1,4-BENZOXAZIN-3(4H)-ONE'>HBK</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]] 2.2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2dga|2dga]], [[3aiq|3aiq]], [[3air|3air]], [[3aiu|3aiu]], [[3aiv|3aiv]], [[3aiw|3aiw]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=HBK:(2S)-2,4-DIHYDROXY-7-METHOXY-2H-1,4-BENZOXAZIN-3(4H)-ONE'>HBK</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TaGlu1b ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4565 Canadian hard winter wheat])</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=3ais FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ais OCA], [https://pdbe.org/3ais PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ais RCSB], [https://www.ebi.ac.uk/pdbsum/3ais PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ais ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-glucosidase Beta-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.21 3.2.1.21] </span></td></tr>
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| - | <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=3ais FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ais OCA], [http://pdbe.org/3ais PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3ais RCSB], [http://www.ebi.ac.uk/pdbsum/3ais PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3ais ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/HGL1B_WHEAT HGL1B_WHEAT]] Acts in defense of young plant parts against pests via the production of hydroxamic acids from hydroxamic acid glucosides. Enzymatic activity is highly correlated with plant growth. The preferred substrate is DIMBOA-beta-D-glucoside.<ref>PMID:10750901</ref> <ref>PMID:16751439</ref> | + | [https://www.uniprot.org/uniprot/HGL1B_WHEAT HGL1B_WHEAT] Acts in defense of young plant parts against pests via the production of hydroxamic acids from hydroxamic acid glucosides. Enzymatic activity is highly correlated with plant growth. The preferred substrate is DIMBOA-beta-D-glucoside.<ref>PMID:10750901</ref> <ref>PMID:16751439</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| - | *[[Beta-glucosidase|Beta-glucosidase]] | + | *[[Beta-glucosidase 3D structures|Beta-glucosidase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Beta-glucosidase]] | + | [[Category: Large Structures]] |
| - | [[Category: Canadian hard winter wheat]] | + | [[Category: Triticum aestivum]] |
| - | [[Category: Miyamoto, T]] | + | [[Category: Miyamoto T]] |
| - | [[Category: Nakamura, C]] | + | [[Category: Nakamura C]] |
| - | [[Category: Sue, M]] | + | [[Category: Sue M]] |
| - | [[Category: Yajima, S]] | + | [[Category: Yajima S]] |
| - | [[Category: Hydrolase]]
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| - | [[Category: Tim barrel]]
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| Structural highlights
Function
HGL1B_WHEAT Acts in defense of young plant parts against pests via the production of hydroxamic acids from hydroxamic acid glucosides. Enzymatic activity is highly correlated with plant growth. The preferred substrate is DIMBOA-beta-D-glucoside.[1] [2]
Publication Abstract from PubMed
The beta-D-glucosidases from wheat (Triticum aestivum) and rye (Secale cereale) hydrolyze benzoxazinone-glucose conjugates. Although wheat and rye glucosidases have high sequence identity, they have different substrate preferences; the wheat enzyme favors DIMBOA-Glc (2-O-beta-D-glucopyranosyl-4-hydroxy-7-methoxy-1,4-benzoxazin-3-one) over DIBOA-Glc (7-demethoxy-DIMBOA-Glc), whereas the rye enzyme preference is the opposite. To investigate the mechanism of substrate binding, we analyzed crystal structures of an inactive mutant of the wheat glucosidase complexed with the natural substrate DIMBOA-Glc, wheat and rye glucosidases complexed with an aglycone DIMBOA, and wheat and rye glucosidases complexed with an inhibitor 2-fluoro-2-deoxy-beta-D-glucose. The binding position of substrate in the active site was determined but interaction between the substrate and Ser-464 or Leu-465 was not observed, although amino acid residues at these two positions are the only structural distinctions between wheat and rye glucosidase catalytic pockets. Variation at these two positions alters the width of the pocket entrance, which may relate to observed differences in substrate specificity. The side chain of Glu-462 that forms hydrogen bonds with the glucose moiety of DIMBOA-Glc moved deeper into the pocket upon substrate binding, and mutation of this residue dramatically decreased enzyme activity.
Active-site architecture of benzoxazinone-glucoside beta-D-glucosidases in Triticeae.,Sue M, Nakamura C, Miyamoto T, Yajima S Plant Sci. 2011 Feb;180(2):268-75. Epub 2010 Sep 19. PMID:21421370[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Sue M, Ishihara A, Iwamura H. Purification and characterization of a hydroxamic acid glucoside beta-glucosidase from wheat (Triticum aestivum L.) seedlings. Planta. 2000 Feb;210(3):432-8. PMID:10750901
- ↑ Sue M, Yamazaki K, Yajima S, Nomura T, Matsukawa T, Iwamura H, Miyamoto T. Molecular and structural characterization of hexameric beta-D-glucosidases in wheat and rye. Plant Physiol. 2006 Aug;141(4):1237-47. Epub 2006 Jun 2. PMID:16751439 doi:10.1104/pp.106.077693
- ↑ Sue M, Nakamura C, Miyamoto T, Yajima S. Active-site architecture of benzoxazinone-glucoside beta-D-glucosidases in Triticeae. Plant Sci. 2011 Feb;180(2):268-75. Epub 2010 Sep 19. PMID:21421370 doi:10.1016/j.plantsci.2010.09.001
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