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Nucleic Acids Research, 1980, Vol. 8, No. 22 5255-5266
© 1980

MOLECULAR BIOLOGY

An examination of models for chromatin transcription

H.J. Gould, G.J. Cowling, N.R. Harborne and J. Allan

Department of Biophysics, King's College London UK

Received September 12, 1980. Structural studies have revealed that chromatin is composed of repeating units or nucleosomes having two distinct domains, the nucleosome core and the linker region. The nucleosome core comprises 146 base pairs of DNA wound in one and three quarter turns around an octamer of histonee made up of two symmetrical tetramers (1) . It may be inferred on topological grounds that this structure must be perturbed during chromatin transcription and replication since the histone core bridges the supercoil which blocks the passage of polymerase along the template and prevents the unwinding of DNA required for enzymatic copying. A number of mechanisms for freeing the DNA template may be envisaged, and one detailed model, based on symmetrical dissociation of the histone tetraisers, has been proposed (2) . Here we present evidence against such unpairing or indeed any detachment of histones from the octamer during chromatin transcription, and we give reasons for favouring a transcriptional mechanism based upon the separation of the octamer from at least one strand of the DNA.


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