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| ==Crystal Structure of a Family GH19 chitinase from Bryum coronatum in complex with (GlcNAc)4== | | ==Crystal Structure of a Family GH19 chitinase from Bryum coronatum in complex with (GlcNAc)4== |
| <StructureSection load='4ij4' size='340' side='right'caption='[[4ij4]], [[Resolution|resolution]] 1.58Å' scene=''> | | <StructureSection load='4ij4' size='340' side='right'caption='[[4ij4]]' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[4ij4]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IJ4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IJ4 FirstGlance]. <br> | | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IJ4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IJ4 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=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | | </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=4ij4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ij4 OCA], [https://pdbe.org/4ij4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ij4 RCSB], [https://www.ebi.ac.uk/pdbsum/4ij4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ij4 ProSAT]</span></td></tr> |
| <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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| <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3wh1|3wh1]]</div></td></tr>
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| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Chitinase Chitinase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.14 3.2.1.14] </span></td></tr>
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| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4ij4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ij4 OCA], [https://pdbe.org/4ij4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ij4 RCSB], [https://www.ebi.ac.uk/pdbsum/4ij4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ij4 ProSAT]</span></td></tr> | |
| </table> | | </table> |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| DESCRIPTIONS: The structure of a GH19 chitinase from the moss Bryum coronatum (BcChi-A) in complex with the substrate was examined by X-ray crystallography and NMR spectroscopy in solution. The X-ray crystal structure of the inactive mutant of BcChi-A (BcChi-A-E61A) liganded with chitin tetramer (GlcNAc)4 revealed a clear electron density of the tetramer bound to subsites -2, -1, +1, and +2. Individual sugar residues were recognized by several amino acids at these subsites through a number of hydrogen bonds. This is the first crystal structure of GH19 chitinase liganded with oligosaccharide spanning the catalytic center. NMR titration experiments of chitin oligosaccharides into the BcChi-A-E61A solution showed that the binding mode observed in the crystal structure is similar to that in solution. The C-1 carbon of -1 GlcNAc, the Oepsilon1 atom of the catalytic base (Glu70), and the Ogamma atom of Ser102 form a "triangle" surrounding the catalytic water, and the arrangement structurally validated the proposed catalytic mechanism of GH19 chitinases. The glycosidic linkage between -1 and +1 sugars was found to be twisted and under strain. This situation may contribute to the reduction of activation energy for hydrolysis. The complex structure revealed a more refined mechanism of the chitinase catalysis.
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| Crystal structure of a "loopless" GH19 chitinase in complex with chitin tetrasaccharide spanning the catalytic center.,Ohnuma T, Umemoto N, Nagata T, Shinya S, Numata T, Taira T, Fukamizo T Biochim Biophys Acta. 2014 Feb 25;1844(4):793-802. doi:, 10.1016/j.bbapap.2014.02.013. PMID:24582745<ref>PMID:24582745</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 4ij4" style="background-color:#fffaf0;"></div>
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| ==See Also== | | ==See Also== |
| *[[Chitinase 3D structures|Chitinase 3D structures]] | | *[[Chitinase 3D structures|Chitinase 3D structures]] |
| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Chitinase]]
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| [[Category: Large Structures]] | | [[Category: Large Structures]] |
| [[Category: Fukamizo, T]] | | [[Category: Fukamizo T]] |
| [[Category: Numata, T]] | | [[Category: Numata T]] |
| [[Category: Ohnuma, T]] | | [[Category: Ohnuma T]] |
| [[Category: Umemoto, N]] | | [[Category: Umemoto N]] |
| [[Category: Carbohydrate]]
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| [[Category: Hydrolase]]
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