View source for 8i7p


==Crystal structure of Ricin A chain bound with N2-(2-amino-4-oxo-3,4-dihydropteridine-7-carbonyl)glycyl-L-tyrosine==
<StructureSection load='8i7p' size='340' side='right'caption='[[8i7p]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8i7p]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ricinus_communis Ricinus communis] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8I7P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8I7P 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]] 1.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=OV9:2-azanyl-4-oxidanylidene-3~{H}-pteridine-7-carboxylic+acid'>OV9</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=8i7p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8i7p OCA], [https://pdbe.org/8i7p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8i7p RCSB], [https://www.ebi.ac.uk/pdbsum/8i7p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8i7p ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Ricin toxin A chain (RTA), from Ricinus communis, is a deadly protein that inactivates ribosomes by degrading an adenine residue at position 4324 in 28S rRNA. Recently, we have demonstrated that pterin-7-carboxamides with peptide pendants were potent RTA inhibitors. Among these, N-(pterin-7-carbonyl)glycyl-L-tyrosine (7PCGY) is the most potent RTA inhibitor as a small organic molecule. However, despite this fascinating inhibitory activity, the mode of interaction of 7PCGY with RTA remains elusive. This study aimed to elucidate the factors responsible for the high RTA inhibitory activity of 7PCGY based on X-ray crystallographic analysis. Herein, we report the successfully resolved X-ray crystal structure of 7PCGY/RTA complexes, revealing that the interaction between the phenolic hydroxy group in 7PCGY and Asn78 of RTA through a hydrogen bonding and the conformational change of Tyr80 and Asn122 are responsible for the high RTA inhibitory activity of 7PCGY.

Crystal structure of ricin toxin A chain complexed with a highly potent pterin-based small-molecular inhibitor.,Goto M, Sakamoto N, Higashi S, Kawata R, Nagatsu K, Saito R J Enzyme Inhib Med Chem. 2023 Dec;38(1):2219038. doi: , 10.1080/14756366.2023.2219038. PMID:37259593<ref>PMID:37259593</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8i7p" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ricin 3D structures|Ricin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Ricinus communis]]
[[Category: Synthetic construct]]
[[Category: Goto M]]
[[Category: Higashi S]]
[[Category: Kawata R]]
[[Category: Nagatsu K]]
[[Category: Saito R]]
[[Category: Sakamoto N]]