ISDA

Entry Detail

PDB ID:

1LJX

Keywords:

DNA

Title:

THE STRUCTURE OF D(TPGPCPGPCPA)2 AT 293K: COMPARISON OF THE EFFECT OF SEQUENCE AND TEMPERATURE

Biological Source:

Source Organism:

PDB Version:

Deposition Date:

2002-04-23

Release Date:

2002-05-03

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.64 Å

R-Value Free:

0.26

R-Value Work:

0.21

Space Group:

P 21 21 21

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Description:5'-D(*TP*GP*CP*GP*CP*A)-3'
Chain IDs:A, B
Chain Length:6
Number of Molecules:2
Biological Source:

Ligand Molecules

Primary Citation

Structure of d(TGCGCA)2 at 293 K: comparison of the effects of sequence and temperature.

Thiyagarajan, S, Satheesh Kumar, P, Rajan, S.S, Gautham, N.Show

Acta Crystallogr.,Sect.D 58 1381 1384 (2002)

PMID: 12136163 DOI: 10.1107/S090744490200896X

Abstact

The crystal structure of a hexameric DNA fragment with the sequence d(TGCGCA)(2) has been solved and refined at 293 K at a resolution of 1.64 A. The molecule adopts a left-handed Z-type helical conformation which is common in alternating pyrimidine-purine sequences. The presence of A.T base pairs at the two terminals does not perturb the structure to any great degree. However, several sequence-specific microstructural changes are noticeable. The structure of the identical sequence determined at 120 K involving somewhat different crystallization conditions has been reported previously [Harper et al. (1998), Acta Cryst. D54, 1273-1284]. A comparison of the present structure with that at low temperature and with that of d(CGCGCG)(2) shows that the effect of the change in sequence is greater than the combined effect of changes in temperature and environment.

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