Journal
CURRENT OPINION IN STRUCTURAL BIOLOGY
Volume 21, Issue 3, Pages 348-357Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.sbi.2011.03.006
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- U.S.P.H.S. [GM34809]
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Condensation of DNA in the nucleosome takes advantage of its double-helical architecture. The DNA deforms at sites where the base pairs face the histone octamer. The largest so-called kink-and-slide deformations occur in the vicinity of arginines that penetrate the minor groove. Nucleosome structures formed from the 601 positioning sequence differ subtly from those incorporating an AT-rich human a-satellite DNA. Restraints imposed by the histone arginines on the displacement of base pairs can modulate the sequence-dependent deformability of DNA and potentially contribute to the unique features of the different nucleosomes. Steric barriers mimicking constraints found in the nucleosome induce the simulated large-scale rearrangement of canonical B DNA to kink-and-slide states. The pathway to these states shows nonharmonic behavior consistent with bending profiles inferred from AFM measurements.
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