Histone-dependent reconstitution and nucleosomal localization of a nonhistone chromosomal protein: the H2A-specific protease.

Abstract:

:We have described earlier a chromatin-bound protease with unique specificity for histone H2A [Eickbush, T. H., Watson, D. K., & Moudrianakis, E. N. (1976) Cell (Cambridge, Mass.) 9, 785--792]. In the present study, we explore the nature of interactions that form and stabilize the enzyme-chromatin system by using the activity of the protease to monitor its binding to DNA and DNA-histone complexes. During salt extraction of chromatin, the protease is released at an ionic strength between that required for the extraction of the slightly lysine-rich histones (H2A and H2B) and the arginine-rich histones (H3 and H4). The reassociation of this nonhistone protein to DNA has an absolute requirement for the H3--H4 tetramer and is only enhanced by the H2A--H2B dimer in the presence of the tetramer. We believe that the binding of the enzyme onto DNA requires some histone-elicited compaction of the helix. We have also examined the distribution of this enzyme within the chromatin fiber by isolating pools of monomer nucleosomes from micrococcal nuclease digests of 0.6 M NaCl extracted chromatin and from reconstituted DNA-protein complexes. The H2A-protease is found with these monomer nucleosome pools, and no activity can be detected in the low molecular weight products released during the digestion. Thus, by virtue of its extraction characteristics from chromatin and its association with isolated nucleosomes, this nonhistone protein exhibits properties hitherto assigned only to the inner histones.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Watson DK,Moudrianakis EN

doi

10.1021/bi00531a008

subject

Has Abstract

pub_date

1982-01-19 00:00:00

pages

248-56

issue

2

eissn

0006-2960

issn

1520-4995

journal_volume

21

pub_type

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