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Nuclear matrix localization and specific matrix DNA binding by receptor binding factor 1 of the avian oviduct progesterone receptor.

Abstract：

:A chromatin acceptor protein for the avian oviduct progesterone receptor (PR), termed receptor binding factor 1 (RBF-1), has recently been shown to (1) be a component of the nuclear binding sites (acceptor sites) for PR and (2) generate high-affinity binding sites (termed the RBF-1 class of sites) on avian genomic DNA [Schuchard et al. (1991) Biochemistry 30, 4535-4542]. A second class of sites and its associated protein (termed RBF-2) were also identified. This paper demonstrates that RBF-1 and also the PR nuclear binding sites are localized in the oviduct nuclear matrix. RBF-1 is found in abundance in the nuclear matrix of liver but only in traces in the nuclear matrix of spleen. Extraction of the nuclear matrix with 4.0 M Gdn-HCl results in the complete removal of RBF-1 as occurs with whole chromatin. Interestingly, a second class of specific PR binding, termed RBF-2, remains on the nuclear matrix after the removal of all RBF-1. Southern blot analysis indicates that the nuclear matrix DNA contains sequences homologous with the 5'-flanking domains of the rapidly steroid regulated c-myc and c-jun protooncogenes and the beta-actin gene, but not genomic sequences of the late sex steroid regulated gene, ovalbumin, or the alpha-actin gene. A specific, small region in the 5'-flanking domain of the c-myc gene appears to be associated with the nuclear matrix. Southwestern blot analysis using partially purified RBF-1 shows a marked affinity and specificity of the RBF-1 for the nuclear matrix DNA.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Schuchard M,Subramaniam M,Ruesink T,Spelsberg TC

doi

10.1021/bi00103a019

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

9516-22

issue

39

eissn

0006-2960

issn

1520-4995

journal_volume

30

pub_type

杂志文章

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