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. 1977 Jan 15;162(1):171–181. doi: 10.1042/bj1620171

Phosphorylation of rat thymus histones, its control and the effects thereon of gamma-irradiation.

A Fónagy, M G Ord, L A Stocken
PMCID: PMC1164580  PMID: 192208

Abstract

The phosphate content of rat thymus histones was determined. As expected for a replicating tissue, histones 1 and 2B were more phosphorylated and had higher 32P uptakes than did histones from resting liver nuclei; the other histones all showed 32P uptake, but the phosphate content and uptake of histone 2A was about half that for liver histone 2A. When thymus nuclei were incubated in a slightly hypo-osmotic medium, non-histone proteins and phosphorylated histones were released into solution; this was enhanced if ATP was present in the medium. [gamma-32P]ATP was incorporated into non-histone proteins, including protein P1, and into the ADP-ribosylated form of histone 1; negligible 32P was incprporated into the other, bound, histones. Histones 1 and 2B added to the incubation medium were extensively, and histones 2A and 4 slightly, phosphorylated. Histones released by increasing the ionic strength of the medium were phosphorylated. Added lysozyme and cytochrome c were neither bound nor phosphorylated, but added non-histone protein P1 was phosphorylated, causing other histones to be released from the nuclei, especially histones 2A and 3. The released histones were phosphorylated. gamma-Irradiation decreased 32P uptake into the non-ADP-ribosylated histones 1 and 4; phosphorylation of histone 1 in vitro was unaffected. The importance of non-histone proteins, ATP availability and nuclear protein kinases to the control of histone phosphorylation in vivo is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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