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. 1978 May;5(5):1487–1499. doi: 10.1093/nar/5.5.1487

DNA-binding nonhistone proteins: DNA site reassociation.

L L Jagodzinski, J C Chilton, J S Sevall
PMCID: PMC342098  PMID: 662691

Abstract

The DNA-binding nonhistone proteins (NHP) have been demonstrated to fractionate the rat genome into protein-bound and unbound DNA sequences. Twenty percent of highly sheared rat DNA [approximately 350 base pair (bp)] can be retained on membrane filters as protein complexes. When extracted from the filter and retitrated with the NHP, a 4- to 5-fold enrichment of binding sites is present in the bound DNA with few, if any, sites detected in the unbound DNA. Rat DNA restricted by EcoRI endonuclease can be fractionated by its DNA-binding NHP retention characteristics. Reassociation kinetics of the bound restricted sequences indicate that 45.6% is a subset of total single-copy sequence of the rat genome an 26.9% is repetitive sequences. Cross hybridization studies indicate the repetitive sequences of the bound DNA are not enriched as much as the slow component of the rat genome. Thus a 4-fold enrichment of a subset of the rat genome has been observed via NHP-DNA interactions.

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Selected References

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