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. 1980 Jan;77(1):127–131. doi: 10.1073/pnas.77.1.127

Points of contact between histone H1 and the histone octamer.

T Boulikas, J M Wiseman, W T Garrard
PMCID: PMC348221  PMID: 6928607

Abstract

The topography of the interaction between histone H1 and the histone octamer has been investigated. Bovine thymus nuclei or enzymatically fragmented chromatin were treated 1-ethyl-3(3-dimethylaminopropyl)carbodiimide, which catalyzes the formation of covalent bonds between residues of proteins in electrostatic contact. Histone H1-core histone dimers were identified and the segments of molecules participating in crosslinking were elucidated. The results demonstrate that the major histone H1-core histone dimer generated upon carbodiimide crosslinking of intact nuclei, chromatin, or mononucleosomes consists of the segment of histone H1 containing amino acids 74-106 crosslinked to the segment of histone H2A containing amino acids 58-129. Thus, the central globular region of histone H1 intimately contacts the histone octamer. Besides histone H1-H2 dimers, two other histone H1-containing crosslinked products were detected. In these instances, the segments of histone H1 molecules containing amino acids 1-72 were shown to participate in crosslinking. The histone H1 contact points defined here all occur within mononucleosomes and not between nucleosomes. These results permit the formulation of a testable model for the arrangement of histone H1 along polynucleosome chains.

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