1z7f: Difference between revisions

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[[Image:1z7f.gif|left|200px]]
{{Seed}}
[[Image:1z7f.png|left|200px]]


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{{STRUCTURE_1z7f|  PDB=1z7f  |  SCENE=  }}  
{{STRUCTURE_1z7f|  PDB=1z7f  |  SCENE=  }}  


'''Crystal structure of 16 base pair RNA duplex containing a C-A mismatch'''
===Crystal structure of 16 base pair RNA duplex containing a C-A mismatch===




==Overview==
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Ribose 2'-amine substitutions are broadly useful as structural probes in nucleic acids. In addition, structure-selective chemical reaction at 2'-amine groups is a robust technology for interrogating local nucleotide flexibility and conformational changes in RNA and DNA. We analyzed crystal structures for several RNA duplexes containing 2'-amino cytidine (C(N)) residues that form either C(N)-G base pairs or C(N)-A mismatches. The 2'-amine substitution is readily accommodated in an A-form RNA helix and thus differs from the C2'-endo conformation observed for free nucleosides. The 2'-amide product structure was visualized directly by acylating a C(N)-A mismatch in intact crystals and is also compatible with A-form geometry. To visualize conformations able to facilitate formation of the amide-forming transition state, in which the amine nucleophile carries a positive partial charge, we analyzed crystals of the C(N)-A duplex at pH 5, where the 2'-amine is protonated. The protonated amine moves to form a strong electrostatic interaction with the 3'-phosphodiester. Taken together with solution-phase experiments, 2'-amine acylation is likely facilitated by either of two transition states, both involving precise positioning of the adjacent 3'-phosphodiester group.
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{{ABSTRACT_PUBMED_16190727}}


==About this Structure==
==About this Structure==
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[[Category: Mismatch]]
[[Category: Mismatch]]
[[Category: Rna]]
[[Category: Rna]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 17:16:22 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 21:08:27 2008''

Revision as of 18:08, 27 July 2008

File:1z7f.png

Template:STRUCTURE 1z7f

Crystal structure of 16 base pair RNA duplex containing a C-A mismatch

Template:ABSTRACT PUBMED 16190727

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structures, reactivity and inferred acylation transition states for 2'-amine substituted RNA., Gherghe CM, Krahn JM, Weeks KM, J Am Chem Soc. 2005 Oct 5;127(39):13622-8. PMID:16190727

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