In vitro chromatin assembly promoted by the Xenopus laevis S-150 cell-free extract is enhanced by treatment with RNase A.

Abstract:

:Cell-free extracts employed as chromatin assembly systems contain a myriad of proteins, polyanions and nucleic acids. The roles of ATP, MgCl2 and other cofactors in the catalysis of nucleosome formation by the Xenopus laevis oocyte S-150 have yet to be established unequivocally. In this study we examine the influence of RNA in the assembly process. Under reaction conditions that inhibit nucleosome formation (+ EDTA), pretreatment of the extract with RNase A revives the chromatin assembly machinery while the rate of DNA supercoiling is stimulated significantly. Addition of purified RNA blocks DNA supercoiling. Taken together, these data suggest that the parameters surrounding in vitro chromatin assembly are variable and subject to modulation by endogenous factors.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Sekiguchi JM,Kmiec EB

doi

10.1093/nar/20.4.889

keywords:

subject

Has Abstract

pub_date

1992-02-25 00:00:00

pages

889-95

issue

4

eissn

0305-1048

issn

1362-4962

journal_volume

20

pub_type

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