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. 1983 Sep;80(18):5510–5514. doi: 10.1073/pnas.80.18.5510

Nucleotide-stimulated proteolysis of histone H1.

C S Surowy, N A Berger
PMCID: PMC384287  PMID: 6310579

Abstract

We have identified a proteolytic system that selectively degrades histone H1 in normal human lymphocytes. Treatment of permeabilized human lymphocytes with a series of nucleotides produced a marked decrease in their histone H1 content compared to untreated cells. The nucleotide-stimulated process was selective for histone H1 because gel electrophoresis showed that almost all other lymphocyte protein bands remained constant while histone H1 disappeared. The elimination of histone H1 appears to be the result of proteolysis by a trypsin-like enzyme because it was inhibited by phenylmethylsulfonyl fluoride, antipain, soybean trypsin inhibitor, and diisopropyl fluorophosphate. Proteolysis was stimulated by P1,P4-di(adenosine-5') tetraphosphate, P1,P3-di(adenosine-5') triphosphate, P1,P5-di(adenosine-5') pentaphosphate, adenosine 5'-tetraphosphate, ATP, adenosine 5'-[alpha, beta-methylene]triphosphate, adenosine 5'-[beta, gamma-methylene]triphosphate, ADP, CTP, GTP, UTP, dATP, or pyrophosphate, whereas AMP, adenosine, adenosine diphosphoribose, NAD+, cAMP, or sodium phosphate did not show this stimulation of proteolysis. ATP, [alpha, beta-methylene]ATP, [beta, gamma-methylene]ATP, and pyrophosphate all stimulated proteolysis, suggesting that a pyrophosphate linkage was necessary for this process. Thus, resting human lymphocytes contain a trypsin-like protease that is stimulated by nucleotides or pyrophosphate to selectively degrade histone H1.

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Selected References

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