1q29: Difference between revisions

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[[Image:1q29.gif|left|200px]]
{{Seed}}
[[Image:1q29.png|left|200px]]


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{{STRUCTURE_1q29|  PDB=1q29  |  SCENE=  }}  
{{STRUCTURE_1q29|  PDB=1q29  |  SCENE=  }}  


'''Hammerhead Ribozyme with 5'-5' G-G linkage: Conformational change experiment'''
===Hammerhead Ribozyme with 5'-5' G-G linkage: Conformational change experiment===




==Overview==
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We have captured the structure of a pre-catalytic conformational intermediate of the hammerhead ribozyme using a phosphodiester tether formed between I and Stem II. This phosphodiester tether appears to mimic interactions in the wild-type hammerhead RNA that enable switching between nuclease and ligase activities, both of which are required in the replicative cycles of the satellite RNA viruses from which the hammerhead ribozyme is derived. The structure of this conformational intermediate reveals how the attacking nucleophile is positioned prior to cleavage, and demonstrates how restricting the ability of Stem I to rotate about its helical axis, via interactions with Stem II, can inhibit cleavage. Analogous covalent crosslinking experiments have demonstrated that imposing such restrictions on interhelical movement can change the hammerhead ribozyme from a nuclease to a ligase. Taken together, these results permit us to suggest that switching between ligase and nuclease activity is determined by the helical orientation of Stem I relative to Stem II.
The line below this paragraph, {{ABSTRACT_PUBMED_12948485}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 12948485 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12948485}}


==About this Structure==
==About this Structure==
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[[Category: Hammerhead ribozyme]]
[[Category: Hammerhead ribozyme]]
[[Category: Rna]]
[[Category: Rna]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:46:38 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:06:07 2008''

Revision as of 06:06, 29 July 2008

File:1q29.png

Template:STRUCTURE 1q29

Hammerhead Ribozyme with 5'-5' G-G linkage: Conformational change experiment

Template:ABSTRACT PUBMED 12948485

About this Structure

Full crystallographic information is available from OCA.

Reference

A helical twist-induced conformational switch activates cleavage in the hammerhead ribozyme., Dunham CM, Murray JB, Scott WG, J Mol Biol. 2003 Sep 12;332(2):327-36. PMID:12948485

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