View source for 1val


==CONCANAVALIN A COMPLEX WITH 4'-NITROPHENYL-ALPHA-D-GLUCOPYRANOSIDE==
<StructureSection load='1val' size='340' side='right'caption='[[1val]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1val]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Canavalia_ensiformis Canavalia ensiformis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VAL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VAL FirstGlance]. <br>
</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=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=PNG:4-NITROPHENYL-ALPHA-D-GLUCOPYRANOSIDE'>PNG</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=1val FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1val OCA], [https://pdbe.org/1val PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1val RCSB], [https://www.ebi.ac.uk/pdbsum/1val PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1val ProSAT]</span></td></tr>
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== Function ==
[[https://www.uniprot.org/uniprot/CONA_CANEN CONA_CANEN]] D-mannose specific lectin. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
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    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/va/1val_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1val ConSurf].
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== Publication Abstract from PubMed ==
Concanavalin A (Con A) is the best-known plant lectin and has important in vitro biological activities arising from its specific saccharide-binding ability. Its exact biological role still remains unknown. The complexes of Con A with 4'-nitrophenyl-alpha-D-mannopyranoside (alpha-PNM) and 4'-nitrophenyl-alpha-D-glucopyranoside (alpha-PNG) have been crystallized in space group P2(1)2(1)2 with cell dimensions a = 135.19 A, b = 155.38 A, c = 71.25 A and a = 134.66 A, b = 155.67 A, and c = 71.42 A, respectively. X-ray diffraction intensities to 2.75 A for the alpha-PNM and to 3.0 A resolution for the alpha-PNG complex have been collected. The structures of the complexes were solved by molecular replacement and refined by simulated annealing methods to crystallographic R-factor values of 0.185/0.186 and free-R-factor values of 0.260/0.274, respectively. In both structures, the asymmetric unit contains four molecules arranged as a tetramer, with approximate 222 symmetry. A saccharide molecule is bound in the sugar-binding site near the surface of each monomer. The nonsugar (aglycon) portion of the compounds used helps to identify the exact orientation of the saccharide in the sugar-binding pocket and is involved in major interactions between tetramers. The hydrogen bonding network in the region of the binding site has been analyzed, and only minor differences with the previously reported Con A-methyl-alpha-D-mannopyranoside complex structure have been observed. Structural differences that may contribute to the slight preference of the lectin for mannosides over glucosides are discussed. Calculations indicate a negative electrostatic surface potential for the saccharide binding site of Con A, which may be important for its biological activity. It is also shown in detail how a particular class of hydrophobic ligands interact with one of the three so-called characteristic hydrophobic sites of the lectins.

The crystal structure of the complexes of concanavalin A with 4'-nitrophenyl-alpha-D-mannopyranoside and 4'-nitrophenyl-alpha-D-glucopyranoside.,Kanellopoulos PN, Pavlou K, Perrakis A, Agianian B, Vorgias CE, Mavrommatis C, Soufi M, Tucker PA, Hamodrakas SJ J Struct Biol. 1996 May-Jun;116(3):345-55. PMID:8812993<ref>PMID:8812993</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Concanavalin 3D structures|Concanavalin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Canavalia ensiformis]]
[[Category: Large Structures]]
[[Category: Hamodrakas, S J]]
[[Category: Kanellopoulos, P N]]
[[Category: Tucker, P A]]
[[Category: Lectin]]
[[Category: Legume lectin]]