Chromosomal Proteins and Gene Expression pp 37-53 | Cite as
Structural Studies on the Second Order of Chromatin Organization
Abstract
In the presence of histones of the H1 family, an increase in salt concentration to the region of 60–140 mM NaC1 leads to a folding of 10 nm filaments of nucleosomes (which exist at 1–10 mM NaCl) into “thick” fibers of ∿30 nm diameter (1). It is this folding -- the next order above that of the nucleosome -- that we refer to as “second order chromatin structure.” The second order structure is not uniform. At the level of the core particle (146 bp of DNA and the core histones), there is clearly a unique structure, although even at this level modifications of histones (and possibly DNA) may influence the higher order structure. Variability is found above the level of the core particles among chromatins from different sources. For example, species specific and cell-type specific differences in linker DNA length are observed: the nucleosomal repeat lengths reported vary from 154 base pairs in Aspergillus (2) up to 248 base pairs for sea urchin sperm (3). Most chromatins have repeat lengths between 180 and 210 base pairs. Also, differences are observed in H1 stoichiometry and the occurrence of different H1 subtypes and post-synthetical modifications (4).These sorts of variability can be expected to introduce variation into the second order organization of chromatin.
Keywords
Sucrose Gradient Core Particle High Order Structure Chromatin Fiber Chicken ErythrocytePreview
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References
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