View source for 2hyq


==Crystal structure of a complex of griffithsin with 6alpha-mannobiose==
<StructureSection load='2hyq' size='340' side='right'caption='[[2hyq]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2hyq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Griffithsia Griffithsia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HYQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2HYQ 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2hyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hyq OCA], [https://pdbe.org/2hyq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2hyq RCSB], [https://www.ebi.ac.uk/pdbsum/2hyq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2hyq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GRFIN_GRISQ GRFIN_GRISQ] 
== 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/hy/2hyq_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=2hyq ConSurf].
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== Publication Abstract from PubMed ==
The mode of binding of oligosaccharides to griffithsin, an antiviral lectin from the red alga Griffithsia sp., was investigated by a combination of X-ray crystallography, isothermal titration calorimetry, and molecular modeling. The structures of complexes of griffithsin with 1--&gt;6alpha-mannobiose and with maltose were solved and refined at the resolution of 2.0 and 1.5 A, respectively. The thermodynamic parameters of binding of 1--&gt;6alpha-mannobiose, maltose, and mannose to griffithsin were determined. Binding profiles of 1--&gt;6alpha-mannobiose and mannose were similar with Kd values of 83.3 microM and 102 microM, respectively. The binding of maltose to griffithsin was significantly weaker, with a fourfold lower affinity (Kd = 394 microM). In all cases the binding at 30 degrees C was entropically rather than enthalpically driven. On the basis of the experimental crystal structures, as well as on previously determined structures of complexes with monosaccharides, it was possible to create a model of a tridentate complex of griffithsin with Man9GlcNAc2, a high mannose oligosaccharide commonly found on the surface of viral glycoproteins. All shorter oligomannoses could be modeled only as bidentate or monodentate complexes with griffithsin. The ability to mediate tight multivalent and multisite interactions with high-mannose oligosaccharides helps to explain the potent antiviral activity of griffithsin.

Crystallographic, thermodynamic, and molecular modeling studies of the mode of binding of oligosaccharides to the potent antiviral protein griffithsin.,Ziolkowska NE, Shenoy SR, O'Keefe BR, McMahon JB, Palmer KE, Dwek RA, Wormald MR, Wlodawer A Proteins. 2007 May 15;67(3):661-70. PMID:17340634<ref>PMID:17340634</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2hyq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Griffithsia]]
[[Category: Large Structures]]
[[Category: Wlodawer A]]
[[Category: Ziolkowska NE]]