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. 1981 Aug 11;9(15):3873–3885. doi: 10.1093/nar/9.15.3873

Cell-cycle-dependent dissociation of histone H1 from chromatin in nuclei of P. polycephalum.

H M Cruickshank, I O Walker
PMCID: PMC327398  PMID: 7279675

Abstract

The dissociation curves of histone H1 from chromatin in interphase and metaphase nuclei from Physarum polycephalum have been determined using CaCl2 as dissociating agent. H1 is less strongly bound to metaphase chromosomes than to interphase chromatin. However, no differences could be detected in the binding of Hl to early S, late S or G2 phase chromatin. The number of CaCl2 molecules involved in binding one H1 molecule to chromatin was reduced from 5 in interphase to 4 in metaphase. The non-electrostatic contribution to the free-energy of binding was small in both cases. A comparison of the binding properties of H1 to sheared chromatin, native chromatin and metaphase chromosomes suggests that the electrostatic binding functions of H1 are completely satisfied within the nucleosome and that further electrostatic interactions are not involved in folding the nucleosomal fibre into the 300 A "solenoid" or the more tightly folded metaphase chromosome.

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Selected References

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