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A model chromatin assembly system. Factors affecting nucleosome spacing.

A Stein, M Bina

Journal of Molecular Biology

|September 15, 1984

Summary

Histone H5 protein facilitates chromatin assembly by aligning nucleosomes on synthetic DNA. This process, aided by polyglutamic acid, mimics natural chromatin structure and spacing, offering insights into repeat length variations.

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Area of Science:

Molecular Biology
Biochemistry
Chromatin Structure

Background:

Chromatin, the complex of DNA and proteins that forms chromosomes, plays a crucial role in genome organization and regulation.
Histones are the primary proteins involved in packaging DNA into nucleosomes, the fundamental repeating units of chromatin.
Histone H5 is a specialized histone found in avian erythrocytes, known to influence chromatin condensation.

Purpose of the Study:

To investigate the role of histone H5 in the assembly of chromatin-like structures using a synthetic DNA polymer.
To understand the mechanism by which histone H5 induces nucleosome alignment and affects nucleosome spacing.
To explore the influence of polyglutamic acid on histone H5-mediated chromatin assembly.

Main Methods:

Reconstitution of synthetic poly[d(A-T)].poly[d(A-T)] with chicken erythrocyte core histones.
Incubation of reconstituted complexes with histone H5 in the presence of polyglutamic acid.
Analysis of nucleosome alignment, spacing, and fiber formation using biophysical techniques.

Main Results:

Histone H5 induced the formation of chromatin-like structures with aligned nucleosomes on the synthetic DNA.
Optimal nucleosome spacing, similar to native chromatin, was achieved with a specific molar ratio of H5 to core octamer.
Polyglutamic acid was found to enhance H5's nucleosome spacing activity by maintaining the solubility of the nucleoprotein complex.

Conclusions:

Histone H5 is capable of inducing physiological nucleosome spacing and chromatin fiber formation on a synthetic DNA template.
The synthetic system provides a valuable model for studying the determinants of nucleosome repeat length and chromatin organization.
This research elucidates the role of histone H5 and polyglutamic acid in chromatin assembly, offering insights into chromatin structure variability.

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