420d

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{{STRUCTURE_420d| PDB=420d | SCENE= }}
{{STRUCTURE_420d| PDB=420d | SCENE= }}
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'''CRYSTAL STRUCTURE OF A 16-MER RNA DUPLEX WITH NON-ADJACENT A(ANTI).G(SYN) MISMATCHES'''
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===CRYSTAL STRUCTURE OF A 16-MER RNA DUPLEX WITH NON-ADJACENT A(ANTI).G(SYN) MISMATCHES===
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==Overview==
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G.A mispairs are one of the most common noncanonical structural motifs of RNA. The 1.9 A resolution crystal structure of the RNA 16-mer r(GCAGAGUUAAAUCUGC)2 has been determined with two isolated or nonadjacent G.A mispairs. The molecule crystallizes with one duplex in the asymmetric unit in space group R3 and unit cell dimensions a = b = c = 49.24 A and alpha = beta = gamma = 51.2 degrees. It is the longest known oligonucleotide duplex at this resolution and isomorphous to the 16-mer duplex with the C.A+ mispairs [Pan, et al., (1998) J. Mol. Biol. 283, 977-984]. The C.A+ mispair behaves like a wobble pair while the G.A+ does not. The G.A mispairs are protonated at N1 of the adenines as in the C.A+ mispairs, and two hydrogen bonds in the G(syn).A+(anti) conformation are formed. The syn guanine is stabilized by an intranucleotide hydrogen bond between the 2-amino and the 5'-phosphate groups. The G(syn).A+(anti) conformation can provide a different surface for recognition in the grooves compared to other G.A hydrogen bonding schemes. The major groove is widened between the two mispairs allowing access to ligands. One of the 3-fold axes is occupied by a sodium ion and a water molecule, while a second is occupied by another water molecule.
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{{ABSTRACT_PUBMED_10052954}}
==About this Structure==
==About this Structure==
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[[Category: Mismatch a rna]]
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Revision as of 10:17, 3 July 2008

Image:420d.png

Template:STRUCTURE 420d

CRYSTAL STRUCTURE OF A 16-MER RNA DUPLEX WITH NON-ADJACENT A(ANTI).G(SYN) MISMATCHES

Template:ABSTRACT PUBMED 10052954

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of an RNA 16-mer duplex R(GCAGAGUUAAAUCUGC)2 with nonadjacent G(syn).A+(anti) mispairs., Pan B, Mitra SN, Sundaralingam M, Biochemistry. 1999 Mar 2;38(9):2826-31. PMID:10052954

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