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1il4

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Revision as of 09:21, 10 January 2018

STRUCTURE OF RICIN A CHAIN BOUND WITH INHIBITOR 9-DEAZAGUANINE

Structural highlights

1il4 is a 1 chain structure with sequence from Castor bean. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1rtc, 1br6, 1br5, 1fmp, 1il3, 1il5, 1il9
Activity:	rRNA N-glycosylase, with EC number 3.2.2.22
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Ribosome inhibiting proteins, RIPs, are a widespread family of toxic enzymes. Ricin is a plant toxin used as a poison and biological warfare agent; shiga toxin is a homologue expressed by pathogenic strains of E. coli. There is interest in creating effective antidote inhibitors to this class of enzymes. RIPs act by binding and hydrolyzing a specific adenine base from rRNA. Previous virtual screens revealed that pterins could bind in the specificity pocket of ricin and inhibit the enzyme. In this paper we explore a range of compounds that could serve as better platforms for inhibitor design. This establishes the importance of key hydrogen bond donors and acceptors for active-site complementarity. 8-Methyl-9-oxoguanine is a soluble compound that has the best inhibitory properties of any platform tested. The X-ray structure of this complex revealed that the inhibitor binds in an unexpected way that provides insight for future design. Several inhibitors of ricin were also shown to be inhibitors of shiga toxin, suggesting this program has the potential to develop effective antidotes to an important form of food poisoning.

Structure-based design and characterization of novel platforms for ricin and shiga toxin inhibition.,Miller DJ, Ravikumar K, Shen H, Suh JK, Kerwin SM, Robertus JD J Med Chem. 2002 Jan 3;45(1):90-8. PMID:11754581^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Miller DJ, Ravikumar K, Shen H, Suh JK, Kerwin SM, Robertus JD. Structure-based design and characterization of novel platforms for ricin and shiga toxin inhibition. J Med Chem. 2002 Jan 3;45(1):90-8. PMID:11754581

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1il4"

@@ Line 1: / Line 1: @@
 ==STRUCTURE OF RICIN A CHAIN BOUND WITH INHIBITOR 9-DEAZAGUANINE==
 <StructureSection load='1il4' size='340' side='right' caption='[[1il4]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1rtc|1rtc]], [[1br6|1br6]], [[1br5|1br5]], [[1fmp|1fmp]], [[1il3|1il3]], [[1il5|1il5]], [[1il9|1il9]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/rRNA_N-glycosylase rRNA N-glycosylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.22 3.2.2.22] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1il4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1il4 OCA], [http://pdbe.org/1il4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1il4 RCSB], [http://www.ebi.ac.uk/pdbsum/1il4 PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1il4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1il4 OCA], [http://pdbe.org/1il4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1il4 RCSB], [http://www.ebi.ac.uk/pdbsum/1il4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1il4 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 14: / Line 15: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/il/1il4_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/il/1il4_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1il4

From Proteopedia

Revision as of 09:21, 10 January 2018

STRUCTURE OF RICIN A CHAIN BOUND WITH INHIBITOR 9-DEAZAGUANINE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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