ISDA: 402D

Deposition Date 1998-06-04

Release Date 1998-06-16

Last Version Date 2024-02-28

Entry Detail

PDB ID:

402D

Keywords:

RNA

Title:

5'-R(*CP*GP*CP*CP*AP*GP*CP*G)-3'

Biological Source:

Source Organism:

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.30 Å

R-Value Free:

0.26

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

H 3 2

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Macromolecular Entities

Polymer Type:polyribonucleotide
Molecule:RNA(5'-R(*CP*GP*CP*CP*AP*GP*CP*G)-3')
Chain IDs:A, B
Chain Length:8
Number of Molecules:2
Biological Source:

Primary Citation

Structure of an RNA internal loop consisting of tandem C-A+ base pairs.

Jang, S.B, Hung, L.W, Chi, Y.I, Holbrook, E.L, Carter, R.J, Holbrook, S.R.Show

Biochemistry 37 11726 11731 (1998)

PMID: 9718295 DOI: 10.1021/bi980758j

Abstact

The crystal structure of the RNA octamer 5'-CGC(CA)GCG-3' has been determined from X-ray diffraction data to 2.3 A resolution. In the crystal, this oligomer forms a self-complementary double helix in the asymmetric unit. Tandem non-Watson-Crick C-A and A-C base pairs comprise an internal loop in the middle of the duplex, which is incorporated with little distortion of the A-form double helix. From the geometry of the C-A base pairs, it is inferred that the adenosine imino group is protonated and donates a hydrogen bond to the carbonyl group of the cytosine. The wobble geometry of the C-A+ base pairs is very similar to that of the common U-G non-Watson-Crick pair.

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Primary Citation of related structures

Abstact

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