By Gerald Litwack (Eds.)
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Extra info for Biochemical Actions of Hormones. Volume 5
The high activity of the chromatin in the diffuse state is not an artifact of isolation because the results have been verified by high-resolution electron microscope autoradiography (Littau et al, 1964). Similar correlations between the diffuse state of chromatin and its activity in RNA synthesis have been observed for mouse cells in tissue culture (Hsu, 1962), in kidney cells (Granboulan and Granboulan, 1965), and in plant tissues (Kemp, 1966). Comparisons of histone acetylation in the "active" and "inactive" fractions of calf thymus chromatin have shown a direct proportionality with the activity of the fractions in RNA synthesis.
These positively charged regions of the histone molecule are most likely to interact with the negatively charged phosphate groups of the DNA helix which envelops the nucleosome "core" (Boublik et al, 1971; Li and Bonner, 1971; Ziccardi and Schumaker, 1973; Weintraub and van Lente, 1974; Adler et al, 1974a; Baldwins al, 1975). Acetylation of one to four lysine residues would diminish the positive charge in the DNAbinding sequences of the histone chain, and would be expected to destabilize the histone-DNA complex.
The effects of estradiol-17/3 on the acetylation of uterine histones have been studied by Libby (1972), who found an increase in [3H]acetate incorporation into histone H4 within 2-5 minutes after injection of the hormone. , 1966), the administration of estradiol-17/3 did not stimulate acetate incorporation into the histone fraction (Libby, 1972). Other estrogens, such as stilbestrol and estriol, were also found to stimulate histone acetylation in the uterus, but testosterone had no such effect (Libby, 1972).
Biochemical Actions of Hormones. Volume 5 by Gerald Litwack (Eds.)