A model for chromatin structure
Copyright policy )A model for chromatin structure
A model for chromatin structure is presented. (a) Each of four histone species, H2A (IIbl or f2a2), H2B (IIb2 or f2b), H3 (III or f3) and H4 (IV or f2al) can form a parallel dimer. (b) These dimers can form two tetramers, (H2A)2(H2b)2 and (H3)2(H4)2. (C) These two tetramers bind a segment of DNA and condense it into a "C" segments. (d) The adjacent segments, termed extended or "E" segments, are bound by histone H1 (I or fl) for the major fraction of chromatin; the other "E" regions can be either bound by non-histone proteins or free of protein binding. (e) The binding of histones causes a structural distortion of the DNA which, depending upon the external conditions, may generate the formation of either an open structure with a heterogeneous and non-uniform supercoil or a compact structure with a string of beads. The model is supported by experimental data on histone-histone interaction, histone-DNA interaction and histone subunit-DNA interaction.
- King’s University United States
- City University of New York United States
- Brooklyn College United States
- Lynn University United States
Binding Sites, Macromolecular Substances, Protein Conformation, DNA, Chromatin, Histones, Models, Structural, Nucleoproteins, X-Ray Diffraction, Nucleic Acid Conformation, Trypsin, Protein Binding
Binding Sites, Macromolecular Substances, Protein Conformation, DNA, Chromatin, Histones, Models, Structural, Nucleoproteins, X-Ray Diffraction, Nucleic Acid Conformation, Trypsin, Protein Binding
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