Complexes of DNA with histones f2a2 and f3. Circular dichroism studies.

Biochemistry
A J AdlerG D Fasman

Abstract

Two histones from calf thymus, the slightly lysine-rich histone f2a2 and the arginine-rich f3, were combined separately, with homologous DNA. The complexes were reconstituted by means of guanidine hydrochloride gradient dialysis, and their circular dichroic (CD) spectra were examined in 0.14 M NaCl. The CD spectra of f2a2-DNA complexes are characterized by a positive band at 272 nm which is blue-shifted and greatly enhanced relative to the corresponding band for native DNA. This type of CD change was noted previously with f2a1-DNA and f2b-DNA complexes. In contrast, f3 histone causes only minor distortions in the DNA CD spectrum, and their character depends upon the state of the two sulfhydryl groups in f3. When the cysteines are reduced, f3-DNA complexes have a slightly increased positive band with a small blue shift; when oxidized disulfide is the predominant form, this CD band becomes slightly smaller than native DNA value. This laboratory has now examined complexes reconstituted from DNA and all five histones of calf thymus. The sum of the CD spectra of these complexes, although very similar to the CD curve for reconstituted complexes containing whole histone, does not approximate that of chromatin; the consequence of this ...Continue Reading

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