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| | ==Crystal structure of GTB C80S/C196S unliganded== | | ==Crystal structure of GTB C80S/C196S unliganded== |
| - | <StructureSection load='3i0c' size='340' side='right' caption='[[3i0c]], [[Resolution|resolution]] 1.55Å' scene=''> | + | <StructureSection load='3i0c' size='340' side='right'caption='[[3i0c]], [[Resolution|resolution]] 1.55Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3i0c]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3I0C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3I0C FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3i0c]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3I0C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3I0C FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1lz7|1lz7]], [[3i0d|3i0d]], [[3i0e|3i0e]], [[3i0f|3i0f]], [[3i0g|3i0g]], [[3i0h|3i0h]], [[3i0i|3i0i]], [[3i0j|3i0j]], [[3i0k|3i0k]], [[3i0l|3i0l]]</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]] 1.55Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ABO, GTB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=3i0c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3i0c OCA], [https://pdbe.org/3i0c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3i0c RCSB], [https://www.ebi.ac.uk/pdbsum/3i0c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3i0c 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/Fucosylgalactoside_3-alpha-galactosyltransferase Fucosylgalactoside 3-alpha-galactosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.1.37 2.4.1.37] </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=3i0c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3i0c OCA], [http://pdbe.org/3i0c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3i0c RCSB], [http://www.ebi.ac.uk/pdbsum/3i0c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3i0c ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/BGAT_HUMAN BGAT_HUMAN] This protein is the basis of the ABO blood group system. The histo-blood group ABO involves three carbohydrate antigens: A, B, and H. A, B, and AB individuals express a glycosyltransferase activity that converts the H antigen to the A antigen (by addition of UDP-GalNAc) or to the B antigen (by addition of UDP-Gal), whereas O individuals lack such activity. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | ==See Also== | | ==See Also== |
| - | *[[Glycosyltransferase|Glycosyltransferase]] | + | *[[Glycosyltransferase 3D structures|Glycosyltransferase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Fucosylgalactoside 3-alpha-galactosyltransferase]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Human]] | + | [[Category: Large Structures]] |
| - | [[Category: Borisova, S]] | + | [[Category: Borisova S]] |
| - | [[Category: Evans, S V]] | + | [[Category: Evans SV]] |
| - | [[Category: Landry, R C]] | + | [[Category: Landry RC]] |
| - | [[Category: Palcic, M M]] | + | [[Category: Palcic MM]] |
| - | [[Category: Persson, M]] | + | [[Category: Persson M]] |
| - | [[Category: Polakowski, R]] | + | [[Category: Polakowski R]] |
| - | [[Category: Schuman, B]] | + | [[Category: Schuman B]] |
| - | [[Category: Seto, N O.L]] | + | [[Category: Seto NOL]] |
| - | [[Category: Weadge, J T]] | + | [[Category: Weadge JT]] |
| - | [[Category: Abo blood group]]
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| - | [[Category: Glycosyltransferase]]
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| - | [[Category: Gtb]]
| + | |
| - | [[Category: Retaining]]
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| - | [[Category: Transferase]]
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| Structural highlights
Function
BGAT_HUMAN This protein is the basis of the ABO blood group system. The histo-blood group ABO involves three carbohydrate antigens: A, B, and H. A, B, and AB individuals express a glycosyltransferase activity that converts the H antigen to the A antigen (by addition of UDP-GalNAc) or to the B antigen (by addition of UDP-Gal), whereas O individuals lack such activity.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
A common feature in the structures of GT-A-fold-type glycosyltransferases is a mobile polypeptide loop that has been observed to participate in substrate recognition and enclose the active site upon substrate binding. This is the case for the human ABO(H) blood group B glycosyltransferase GTB, where amino acid residues 177-195 display significantly higher levels of disorder in the unliganded state than in the fully liganded state. Structural studies of mutant enzymes GTB/C80S/C196S and GTB/C80S/C196S/C209S at resolutions ranging from 1.93 to 1.40 A display the opposite trend, where the unliganded structures show nearly complete ordering of the mobile loop residues that is lost upon substrate binding. In the liganded states of the mutant structures, while the UDP moiety of the donor molecule is observed to bind in the expected location, the galactose moiety is observed to bind in a conformation significantly different from that observed for the wild-type chimeric structures. Although this would be expected to impede catalytic turnover, the kinetics of the transfer reaction are largely unaffected. These structures demonstrate that the enzymes bind the donor in a conformation more similar to the dominant solution rotamer and facilitate its gyration into the catalytically competent form. Further, by preventing active-site closure, these structures provide a basis for recently observed cooperativity in substrate binding. Finally, the mutation of C80S introduces a fully occupied UDP binding site at the enzyme dimer interface that is observed to be dependent on the binding of H antigen acceptor analog.
Cysteine-to-serine mutants dramatically reorder the active site of human ABO(H) blood group B glycosyltransferase without affecting activity: structural insights into cooperative substrate binding.,Schuman B, Persson M, Landry RC, Polakowski R, Weadge JT, Seto NO, Borisova SN, Palcic MM, Evans SV J Mol Biol. 2010 Sep 17;402(2):399-411. Epub 2010 Jul 23. PMID:20655926[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Schuman B, Persson M, Landry RC, Polakowski R, Weadge JT, Seto NO, Borisova SN, Palcic MM, Evans SV. Cysteine-to-serine mutants dramatically reorder the active site of human ABO(H) blood group B glycosyltransferase without affecting activity: structural insights into cooperative substrate binding. J Mol Biol. 2010 Sep 17;402(2):399-411. Epub 2010 Jul 23. PMID:20655926 doi:10.1016/j.jmb.2010.07.036
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