View source for 3hio


==Crystal structure of Ricin A-chain in complex with the cyclic tetranucleotide inhibitor, a transition state analogue==
<StructureSection load='3hio' size='340' side='right'caption='[[3hio]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3hio]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Ricinus_communis Ricinus communis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HIO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HIO 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=C2X:9,9-{(2R,3R,3AR,5S,7AR,9R,10R,10AR,12S,23R,25AR,27R,28R,28AR,30S,32AR,35AR,37S,39AR)-9-(6-AMINO-9H-PURIN-9-YL)-34-[(4-AMINO-5H-PYRROLO[3,2-D]PYRIMIDIN-7-YL)METHYL]-5,12,23,30,37-PENTAHYDROXY-3,10,28-TRIMETHOXY-5,12,23,30,37-PENTAOXIDOTETRACOSAHYDRO-2H,7H,25H-TRIFURO[3,2-F 3,2-L 3,2-X]PYRROLO[3,4-R][1,3,5,9,11,15,17,21,23,27,29,2,4,10,16,22,28]UNDECAOXAZAPENTAPHOSPHACYCLOPENTATRIACONTINE-2,27-DIYL}BIS(2-AMINO-3,9-DIHYDRO-6H-PURIN-6-ONE)'>C2X</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=3hio FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hio OCA], [https://pdbe.org/3hio PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hio RCSB], [https://www.ebi.ac.uk/pdbsum/3hio PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hio ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RICI_RICCO RICI_RICCO] Ricin is highly toxic to animal cells and to a lesser extent to plant cells. The A chain acts as a glycosidase that removes a specific adenine residue from an exposed loop of the 28S rRNA (A4324 in mammals), leading to rRNA breakage. As this loop is involved in elongation factor binding, modified ribosomes are catalytically inactive and unable to support protein synthesis. The A chain can inactivate a few thousand ribosomes per minute, faster than the cell can make new ones. Therefore a single A chain molecule can kill an animal cell. The B chain binds to beta-D-galactopyranoside moieties on cell surface glycoproteins and glycolipids and facilitates the entry into the cell of the A chain; B chains are also responsible for cell agglutination (Lectin activity).
== 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/hi/3hio_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=3hio ConSurf].
<div style="clear:both"></div>

==See Also==
*[[Ricin 3D structures|Ricin 3D structures]]
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Ricinus communis]]
[[Category: Almo SC]]
[[Category: Goldman JD]]
[[Category: Ho M]]
[[Category: Schramm VL]]
[[Category: Sturm MB]]