2plb

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Revision as of 08:42, 23 January 2008

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spinqualitylabelsall models 2plb, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

D(GTATACC) under hydrostatic pressure of 1.39 GPa

Overview

The behaviour of the d(GGTATACC) oligonucleotide has been investigated by, X-ray crystallography at 295 K in the range from ambient pressure to 2 GPa, ( approximately 20 000 atm). Four 3D-structures of the A-DNA form (at, ambient pressure, 0.55, 1.09 and 1.39 GPa) were refined at 1.60 or 1.65 A, resolution. In addition to the diffraction pattern of the A-form, the, broad meridional streaks previously explained by occluded B-DNA octamers, within the channels of the crystalline A-form matrix were observed up to, at least 2 GPa. This work highlights an important property of nucleic, acids, their capability to withstand very high pressures, while keeping in, such conditions a nearly invariant geometry of base pairs that store and, carry genetic information. The double-helix base-paired architecture, behaves as a molecular spring, which makes it especially adapted to very, harsh conditions. These features may have contributed to the emergence of, a RNA World at prebiotic stage.

About this Structure

2PLB is a Protein complex structure of sequences from [1] with as ligand. Known structural/functional Site: . Full crystallographic information is available from OCA.

Reference

Adaptation of the base-paired double-helix molecular architecture to extreme pressure., Girard E, Prange T, Dhaussy AC, Migianu-Griffoni E, Lecouvey M, Chervin JC, Mezouar M, Kahn R, Fourme R, Nucleic Acids Res. 2007 Jul 7;. PMID:17617642

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