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Biophysical Journal 73: 966-971 (1997)
© 1997 the Biophysical Society

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Cooperative chiral order in the B-Z transition in random sequences of DNA.

J V Selinger and J M Schnur

Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA. selinger@karma.nrl.navy.mil

ABSTRACT

We present a theory for cooperative chiral order in the transition between right-handed B-DNA and left-handed Z-DNA. This theory, based on the random-field Ising model, predicts the characteristic length scale of Z-DNA segments. This length scale depends on whether the DNA is a homopolymer or a random sequence: it is approximately 4000 nucleotides in a homopolymer but only approximately 25 nucleotides in a random sequence. These theoretical results are consistent with experiments on DNA homopolymers and random sequences.






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Copyright © 1997 by the Biophysical Society.