View source for 4esi


==Structure of ricin A chain bound with N-((1H-1,2,3-triazol-4-yl)methyl-2-amino-4-oxo-3,4-dihydropteridine-7-carboxamide==
<StructureSection load='4esi' size='340' side='right'caption='[[4esi]], [[Resolution|resolution]] 1.87&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4esi]] 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=4ESI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ESI 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]] 1.87&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0RB:2-AMINO-4-OXO-N-(1H-1,2,3-TRIAZOL-5-YLMETHYL)-1,4-DIHYDROPTERIDINE-7-CARBOXAMIDE'>0RB</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=4esi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4esi OCA], [https://pdbe.org/4esi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4esi RCSB], [https://www.ebi.ac.uk/pdbsum/4esi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4esi 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).

==See Also==
*[[Ricin 3D structures|Ricin 3D structures]]
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Ricinus communis]]
[[Category: Anslyn EV]]
[[Category: Jasheway KR]]
[[Category: Kamat I]]
[[Category: Manzano LA]]
[[Category: Monzingo AF]]
[[Category: Pruet JM]]
[[Category: Robertus JD]]
[[Category: Ryoto S]]
[[Category: Wiget PA]]