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New page: left|200px<br /><applet load="1bwu" size="450" color="white" frame="true" align="right" spinBox="true" caption="1bwu, resolution 2.80Å" /> '''MANNOSE-SPECIFIC AGG... |
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== | ==MANNOSE-SPECIFIC AGGLUTININ (LECTIN) FROM GARLIC (ALLIUM SATIVUM) BULBS COMPLEXED WITH ALPHA-D-MANNOSE== | ||
A mannose-specific agglutinin, isolated from garlic bulbs, has been | <StructureSection load='1bwu' size='340' side='right'caption='[[1bwu]], [[Resolution|resolution]] 2.80Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1bwu]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Allium_sativum Allium sativum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BWU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BWU FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene></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=1bwu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bwu OCA], [https://pdbe.org/1bwu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bwu RCSB], [https://www.ebi.ac.uk/pdbsum/1bwu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bwu ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q38789_ALLSA Q38789_ALLSA] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bw/1bwu_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bwu ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
A mannose-specific agglutinin, isolated from garlic bulbs, has been crystallized in the presence of a large excess of alpha-d-mannose, in space group C2 and cell dimensions, a=203.24, b=43.78, c=79.27 A, beta=112.4 degrees, with two dimers in the asymmetric unit. X-ray diffraction data were collected up to a nominal resolution of 2.4 A and the structure was solved by molecular replacement. The structure, refined to an R-factor of 22.6 % and an Rfree of 27.8 % reveals a beta-prism II fold, similar to that in the snowdrop lectin, comprising three antiparallel four-stranded beta-sheets arranged as a 12-stranded beta-barrel, with an approximate internal 3-fold symmetry. This agglutinin is, however, a dimer unlike snowdrop lectin which exists as a tetramer, despite a high degree of sequence similarity between them. A comparison of the two structures reveals a few substitutions in the garlic lectin which stabilise it into a dimer and prevent tetramer formation. Three mannose molecules have been identified on each subunit. In addition, electron density is observed for another possible mannose molecule per dimer resulting in a total of seven mannose molecules in each dimer. Although the mannose binding sites and the overall structure are similar in the subunits of snowdrop and garlic lectin, their specificities to glycoproteins such as GP120 vary considerably. These differences appear, in part, to be a direct consequence of the differences in oligomerisation, implying that variation in quaternary association may be a mode of achieving oligosaccharide specificity in bulb lectins. | |||
Crystal structure of a dimeric mannose-specific agglutinin from garlic: quaternary association and carbohydrate specificity.,Chandra NR, Ramachandraiah G, Bachhawat K, Dam TK, Surolia A, Vijayan M J Mol Biol. 1999 Jan 22;285(3):1157-68. PMID:9887270<ref>PMID:9887270</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1bwu" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Agglutinin 3D structures|Agglutinin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Allium sativum]] | [[Category: Allium sativum]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Bachhawat | [[Category: Bachhawat K]] | ||
[[Category: Chandra | [[Category: Chandra NR]] | ||
[[Category: Dam | [[Category: Dam TK]] | ||
[[Category: Ramachandraiah | [[Category: Ramachandraiah G]] | ||
[[Category: Surolia | [[Category: Surolia A]] | ||
[[Category: Vijayan | [[Category: Vijayan M]] | ||
Latest revision as of 10:12, 9 October 2024
MANNOSE-SPECIFIC AGGLUTININ (LECTIN) FROM GARLIC (ALLIUM SATIVUM) BULBS COMPLEXED WITH ALPHA-D-MANNOSEMANNOSE-SPECIFIC AGGLUTININ (LECTIN) FROM GARLIC (ALLIUM SATIVUM) BULBS COMPLEXED WITH ALPHA-D-MANNOSE
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedA mannose-specific agglutinin, isolated from garlic bulbs, has been crystallized in the presence of a large excess of alpha-d-mannose, in space group C2 and cell dimensions, a=203.24, b=43.78, c=79.27 A, beta=112.4 degrees, with two dimers in the asymmetric unit. X-ray diffraction data were collected up to a nominal resolution of 2.4 A and the structure was solved by molecular replacement. The structure, refined to an R-factor of 22.6 % and an Rfree of 27.8 % reveals a beta-prism II fold, similar to that in the snowdrop lectin, comprising three antiparallel four-stranded beta-sheets arranged as a 12-stranded beta-barrel, with an approximate internal 3-fold symmetry. This agglutinin is, however, a dimer unlike snowdrop lectin which exists as a tetramer, despite a high degree of sequence similarity between them. A comparison of the two structures reveals a few substitutions in the garlic lectin which stabilise it into a dimer and prevent tetramer formation. Three mannose molecules have been identified on each subunit. In addition, electron density is observed for another possible mannose molecule per dimer resulting in a total of seven mannose molecules in each dimer. Although the mannose binding sites and the overall structure are similar in the subunits of snowdrop and garlic lectin, their specificities to glycoproteins such as GP120 vary considerably. These differences appear, in part, to be a direct consequence of the differences in oligomerisation, implying that variation in quaternary association may be a mode of achieving oligosaccharide specificity in bulb lectins. Crystal structure of a dimeric mannose-specific agglutinin from garlic: quaternary association and carbohydrate specificity.,Chandra NR, Ramachandraiah G, Bachhawat K, Dam TK, Surolia A, Vijayan M J Mol Biol. 1999 Jan 22;285(3):1157-68. PMID:9887270[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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