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1ifu

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[[Image:1ifu.jpg|left|200px]]
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{{STRUCTURE_1ifu| PDB=1ifu | SCENE= }}
{{STRUCTURE_1ifu| PDB=1ifu | SCENE= }}
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'''RICIN A-CHAIN (RECOMBINANT) COMPLEX WITH FORMYCIN'''
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===RICIN A-CHAIN (RECOMBINANT) COMPLEX WITH FORMYCIN===
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==Overview==
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Ricin is a potent plant toxin which acts by removing a specific adenine residue from the ribosome. The X-ray crystal structure of a new, tetragonal crystal form of the recombinant ricin A-chain diffracting to 1.8 A resolution has been determined via molecular replacement methods and refined to a crystallographic R-factor of 18.6%. The higher resolution electron density allowed improvements to be made upon previously published models, resulting in an increase in the assigned secondary structure of the protein. The enzyme adopts the same global conformation in this crystal form with differences in detail due only partly to crystal packing. The active site superimposes closely with those of previously published models but the locations of the active-site water molecules differ in this structure. To address the current mechanistic model, an additional two structures are presented: recombinant ricin A-chain complexed with the substrate analogue formycin monophosphate as well as with adenosine monophosphate, which is cleaved by the crystalline enzyme. The formycin monophosphate displaces a putative catalytic water molecule. This supports the notion that the analogue does not bind in a transition state conformation and that contacts from other elements of the 28 S RNA natural substrate are required to achieve full reactivity. The structure of the adenosine monophosphate complex suggests a mechanism for the release of the adenine product via of the side-chain Tyr80. The structures suggest that Glu177 is better positioned for the activation of the catalytic water molecule than Arg180.
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(as it appears on PubMed at http://www.pubmed.gov), where 7990130 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7990130}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Toxin]]
[[Category: Toxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:57:17 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:54:34 2008''

Revision as of 07:54, 1 July 2008

Image:1ifu.png

Template:STRUCTURE 1ifu

RICIN A-CHAIN (RECOMBINANT) COMPLEX WITH FORMYCIN

Template:ABSTRACT PUBMED 7990130

About this Structure

1IFU is a Single protein structure of sequence from Ricinus communis. Full crystallographic information is available from OCA.

Reference

X-ray structure of recombinant ricin A-chain at 1.8 A resolution., Weston SA, Tucker AD, Thatcher DR, Derbyshire DJ, Pauptit RA, J Mol Biol. 1994 Dec 9;244(4):410-22. PMID:7990130

Page seeded by OCA on Tue Jul 1 10:54:34 2008

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