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| | <StructureSection load='6dht' size='340' side='right'caption='[[6dht]], [[Resolution|resolution]] 1.42Å' scene=''> | | <StructureSection load='6dht' size='340' side='right'caption='[[6dht]], [[Resolution|resolution]] 1.42Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6dht]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Baco1 Baco1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6DHT OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6DHT FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6dht]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacteroides_ovatus_ATCC_8483 Bacteroides ovatus ATCC 8483]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6DHT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6DHT FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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]] 1.42Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">BACOVA_02649 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=411476 BACO1])</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Xyloglucan-specific_endo-beta-1,4-glucanase Xyloglucan-specific endo-beta-1,4-glucanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.151 3.2.1.151] </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=6dht FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6dht OCA], [https://pdbe.org/6dht PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6dht RCSB], [https://www.ebi.ac.uk/pdbsum/6dht PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6dht ProSAT]</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=6dht FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6dht OCA], [http://pdbe.org/6dht PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6dht RCSB], [http://www.ebi.ac.uk/pdbsum/6dht PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6dht ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/BGH9A_BACO1 BGH9A_BACO1]] Catalyzes endohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan with retention of the beta-configuration of the glycosyl residues in xyloglucan degradation. Cleaves the backbone of the 3 major types of natural xyloglucans (seed galactoxyloglucan from tamarind kernel, dicot fucogalactoxyloglucan from lettuce leaves, and solanaceous arabinogalactoxyloglucan from tomato fruit), to produce xyloglucan oligosaccharides. May be superfluous in xyloglucan degradation compared to BoGH5A (AC A7LXT7), the other Xyloglucan-specific endo-beta-1,4-glucanase.<ref>PMID:24463512</ref> | + | [https://www.uniprot.org/uniprot/BGH9A_BACO1 BGH9A_BACO1] Catalyzes endohydrolysis of 1,4-beta-D-glucosidic linkages in xyloglucan with retention of the beta-configuration of the glycosyl residues in xyloglucan degradation. Cleaves the backbone of the 3 major types of natural xyloglucans (seed galactoxyloglucan from tamarind kernel, dicot fucogalactoxyloglucan from lettuce leaves, and solanaceous arabinogalactoxyloglucan from tomato fruit), to produce xyloglucan oligosaccharides. May be superfluous in xyloglucan degradation compared to BoGH5A (AC A7LXT7), the other Xyloglucan-specific endo-beta-1,4-glucanase.<ref>PMID:24463512</ref> |
| - | <div style="background-color:#fffaf0;">
| + | |
| - | == Publication Abstract from PubMed ==
| + | |
| - | Dietary fiber is an important food source for members of the human gut microbiome. Members of the dominant Bacteroidetes phylum capture diverse polysaccharides via the action of multiple cell surface proteins encoded within polysaccharide utilization loci (PUL). The independent activities of PUL-encoded glycoside hydrolases (GHs) and surface glycan-binding proteins (SGBPs) for the harvest of various glycans have been studied in detail, but how these proteins work together to coordinate uptake is poorly understood. Here, we combine genetic and biochemical approaches to discern the interplay between the BoGH9 endoglucanase and the xyloglucan-binding proteins SGBP-A and SGBP-B from the Bacteroides ovatus xyloglucan utilization locus (XyGUL). The expression of BoGH9, a weakly active xyloglucanase in isolation, is required in a strain that expresses a non-binding version of SGBP-A (SGBP-A*). The crystal structure of the BoGH9 enzyme suggests the molecular basis for its robust activity on mixed-linkage beta-glucan compared to xyloglucan. However, catalytically inactive site-directed mutants of BoGH9 fail to complement the deletion of the active BoGH9 in a SGBP-A* strain. We also find that SGBP-B is needed in an SGBP-A* background to support growth on xyloglucan, but that the non-binding SGBP-B* protein acts in a dominant negative manner to inhibit growth on xyloglucan. We postulate a model whereby the SGBP-A, SGBP-B, and BoGH9 work together at the cell surface, likely within a discrete complex, and that xyloglucan binding by SGBP-B and BoGH9 may facilitate the orientation of the xyloglucan for transfer across the outer membrane.
| + | |
| - | | + | |
| - | A Cell-Surface GH9 Endo-Glucanase Coordinates with Surface Glycan-Binding Proteins to Mediate Xyloglucan Uptake in the Gut Symbiont Bacteroides ovatus.,Foley MH, Dejean G, Hemsworth GR, Davies GJ, Brumer H, Koropatkin NM J Mol Biol. 2019 Mar 1;431(5):981-995. doi: 10.1016/j.jmb.2019.01.008. Epub 2019 , Jan 19. PMID:30668971<ref>PMID:30668971</ref>
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| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 6dht" style="background-color:#fffaf0;"></div>
| + | |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Baco1]] | + | [[Category: Bacteroides ovatus ATCC 8483]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Xyloglucan-specific endo-beta-1,4-glucanase]]
| + | [[Category: Foley MH]] |
| - | [[Category: Foley, M H]] | + | [[Category: Koropatkin NM]] |
| - | [[Category: Koropatkin, N M]] | + | |
| - | [[Category: Cellulase]]
| + | |
| - | [[Category: Gh9]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
