DNA bending and sugar switching.

Abstract:

:Abstract Using high frequency antiphase NMR spectroscopy and computer simulations of the antiphase spectra, we studied the equlibria in the sugar conformations in the DNA duplex 11-mer containing the AAA tract surrounded by cytosines. We demonstrate that at the 3'-end of the A-tract, the sugar switches from the common S-conformer (B-like form) to the N-conformer (A-like form) with the probability of 50-60%, thus creating a purine-pyrimidine step with heteronomous characteristics. The presence of this local B-A junction in one strand leads to compression of the interphosphate distance in this strand. We calculate the effect of this sugar switch on the helical parameters that are related to DNA bending. Finally, we suggest that the heteronomous deformation present in the A(n)C motif of unbound DNA duplexes might be the initial recognition site for proteins which bind to such junctions; and that in A(n)C stretches, DNA bending is a complicated dynamic process, i.e., locally noncanonical N conformers of the sugar phosphate backbone mix in with the B-like S conformers leading to bending.

journal_name

J Biomol Struct Dyn

authors

Kamath S,Sarma MH,Zhurkin VB,Turner CJ,Sarma RH

doi

10.1080/07391102.2000.10506637

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

317-25

eissn

0739-1102

issn

1538-0254

journal_volume

17 Suppl 1

pub_type

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