Nucleic Acids Research, 1981, Vol. 9, No. 22 5883-5894
© 1981
MOLECULAR BIOLOGY |
Histories H1 and H5: one or two molecules per nucleosome?
Department of Biochemistry, University of Cambridge Tennis Court Road, Cambridge CB2 1QW, UK
Received September 29, 1981. We have determined histone stoichiometries in nuclei from several sources by a direct chemical method, with the particular aim of quantitating histone H1 and, in chicken erythrocytes, H5, and of distinguishing between one and two molecules per nucleosome. The four histones H3, H4, H2A and H2B are found in equimolar amounts, as expected for the core histone octamer. The molar ratio of H1 in lymphocyte and glial nuclei is 1.0 per octamer, and in liver nuclei from three species 0.8 per octamer. These results suggest that each nucleosome has one H1 molecule; nucleosomes could acquire two molecules of H1 only at the expense of others containing none. The stoichiometry of H5 in chicken erythrocyte nuclei is similar to that of H1 in other nuclei, being about 0.9 molecules per nucleosome; the H1 also present in these nuclei amounts to 0.4 molecules per nucleosome.
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