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Nucleic Acids Research, 1977, Vol. 4, No. 1 117-127
© 1977

Articles

The effect of H1 histone on the action of DNA-relaxing enzyme

Minou Bina-Stein and Maxine F. Singer

National Cancer Institute Bethesda, MD 20014, USA

Received September 28, 1976. The action of DNA-relaxing enzyme on Hl-ENA complexes was investigated. Complexes of superhelical and relaxed closed circular duplex DNA with H1 were treated with mammalian relaxing enzyme, deproteinized, and electro-phoresed on agarose gels. At relatively low ratios of H1 to superhelical DNA, molecules of superhelical density intermediate between those of the starting material and relaxed DNA, the normal product, were generated. At relatively high H1 histone concentrations (H1:DNA greater than 0.4 w/w), the superhelical DNA was not relaxed. Further, no superhelical turns were introduced into relaxed closed duplex DNA at any concentration of H1 tested. Thus, the binding of H1 histone to DNA prevents the action of the relaxing enzyme. Moreover, H1 histone does not appear to unwind the DNA duplex upon binding. The implications of these observations and the previously demonstrated specificity of H1 histone for superhelical DNA are discussed in relation to the structure of chromatin.


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[Abstract] [Full Text] [PDF]


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