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. 1979 Apr;76(4):1628–1632. doi: 10.1073/pnas.76.4.1628

Nucleosome periodicity in HeLa cell chromatin as probed by micrococcal nuclease.

T R Butt, D B Jump, M E Smulson
PMCID: PMC383443  PMID: 109831

Abstract

When HeLa cell nuclei were treated with micrococcal nuclease (nucleate 3-oligonucleotidohydrolase, EC 3.1.4.7), lysed, and centrifuged, the supernatant from early digests contained two predominant classes of polynucleosomes of repeat size 8N and 16N. With increasing digestion time, the 16 N polynucleosome appeared to be cleaved to the 8N species and finally to the basic subunit of chromatin. The size of the polynucleosomes has been determined by DNA analysis and on polyacrylamide electrophoretic gels of native chromatin particles. The 16N polynucleosome appears to be a unique higher ordered structural component of HeLa cell chromatin. Our recent report, showing that the nuclear protein-modifying enzyme poly(ADP-ribose) polymerase increases in specific activity progressively with increasing nucleosome repeat size up to 8-10N, has been extended in the present study. Activity was also elevated in the polynucleosomes of the 16N structure preferentially cleaved by micrococcal nuclease, although specific activity of the enzyme was highest in octanucleosomes. Acceptors for poly(ADP-ribose) have also been determined in these particles.

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