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1yfv

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{{STRUCTURE_1yfv| PDB=1yfv | SCENE= }}
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'''STRUCTURE OF (5'-R(GP*GP*CP*GP*AP*GP*CP*C)-3')2 BY 2-D NMR, 1 STRUCTURE'''
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===STRUCTURE OF (5'-R(GP*GP*CP*GP*AP*GP*CP*C)-3')2 BY 2-D NMR, 1 STRUCTURE===
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==Overview==
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The duplex (rGGCGAGCC)2 contains tandem G x A mismatches--a common motif in the secondary structures of biological RNAs. The three-dimensional structure of (rGGCGAGCC)2 was derived using molecular dynamics and energy minimization with NMR-derived restraints for 78 interproton distances (per strand), 18 hydrogen bonds for the six Watson-Crick G x C pairs, and 26 dihedral angles (per strand). The G x A mismatch structures are similar to those observed in a DNA duplex [Li, Y., Zon, G., &amp; Wilson, W. D. (1991) Proc. Natl. Acad. Sci. U.S.A. 80, 26-30] and an RNA hairpin [Heus, H. A., &amp; Pardi, A. (1991) Science 253, 191-193], with hydrogen bonds from guanine 2-amino and N3 to adenine N7 and 6-amino, respectively. The other G 2-amino and A 6-amino protons are within hydrogen-bonding distance of a phosphate oxygen and 2'-oxygen, respectively. Strong interstrand A-A and G-G stacking is observed between the G x A mismatches. This contrasts with the poor stacking observed between the G x A mismatches and closing G x C base pairs. The stems are basically A-form with all bases in the anti conformation and all nonterminal sugars in the C3'-endo conformation. The structure rationalizes previous thermodynamic, circular dichroism, and imino proton NMR results and suggests tandem G x A mismatches in RNA may provide a contact site for tertiary interactions.
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(as it appears on PubMed at http://www.pubmed.gov), where 8251479 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8251479}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YFV OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YFV OCA].
==Reference==
==Reference==
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[[Category: G:a mismatch]]
[[Category: G:a mismatch]]
[[Category: Ribonucleic acid]]
[[Category: Ribonucleic acid]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:16:10 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 00:56:55 2008''

Revision as of 21:56, 27 July 2008

Image:1yfv.png

Template:STRUCTURE 1yfv

STRUCTURE OF (5'-R(GP*GP*CP*GP*AP*GP*CP*C)-3')2 BY 2-D NMR, 1 STRUCTURE

Template:ABSTRACT PUBMED 8251479

About this Structure

Full experimental information is available from OCA.

Reference

Structure of (rGGCGAGCC)2 in solution from NMR and restrained molecular dynamics., SantaLucia J Jr, Turner DH, Biochemistry. 1993 Nov 30;32(47):12612-23. PMID:8251479

Page seeded by OCA on Mon Jul 28 00:56:55 2008

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