ISDA

Deposition Date 1999-11-03

Release Date 2000-03-06

Last Version Date 2024-02-07

Entry Detail

PDB ID:

1DC0

Keywords:

DNA

Title:

CRYSTAL STRUCTURE OF AN A/B-DNA INTERMEDIATE CATGGGCCCATG

Biological Source:

Source Organism:

(Taxon ID: ) (Taxon ID: )

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.30 Å

R-Value Free:

0.19

R-Value Work:

0.16

R-Value Observed:

0.17

Space Group:

P 41 21 2

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*CP*AP*TP*GP*GP*GP*CP*CP*CP*AP*TP*G)-3')
Chain IDs:A, B
Chain Length:12
Number of Molecules:2
Biological Source:

Primary Citation

The structure of a stable intermediate in the A ;-> B DNA helix transition

Ng, H.L, Kopka, M.L, Dickerson, R.E.Show

Proc.Natl.Acad.Sci.USA 97 2035 2039 (2000)

PMID: 10688897 DOI: 10.1073/pnas.040571197

Abstact

The DNA dodecamer CATGGGCCCATG in a crystal structure of resolution 1.3 A has a conformation intermediate between A and B DNA. This trapping of a stable intermediate suggests that the A and B DNA families are not discrete, as previously believed. The structure supports a base-centered rather than a backbone-centered mechanism for the A <--> B transition mediated by guanine tracts. Interconversion between A and B DNA provides another means for regulating protein-DNA recognition.

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Primary Citation of related structures