JAB1 interacts with both the progesterone receptor and SRC-1 - PubMed (original) (raw)

. 2000 Mar 24;275(12):8540-8.

doi: 10.1074/jbc.275.12.8540.

Affiliations

• PMID: 10722692
• DOI: 10.1074/jbc.275.12.8540

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JAB1 interacts with both the progesterone receptor and SRC-1

A Chauchereau et al. J Biol Chem. 2000.

Free article

Abstract

JAB1 (Jun activation domain-binding protein-1) has previously been described as a coactivator of AP1 transcription factor. We show here, by yeast and mammalian two-hybrid analyses and by pull-down experiments, that JAB1 also interacts with both the progesterone receptor (PR) and the steroid receptor coactivator 1 (SRC-1) and that it stabilizes PR-SRC-1 complexes. We also show that JAB1 potentiates the activity of a variety of transcription factors known to associate with SRC-1 (nuclear receptors, activator protein-1, and nuclear factor kappaB). This occurs without any modification of PR or SRC-1 concentration. JAB1 is a subunit of a large multiprotein complex that has been called the COP9 signalosome. The latter is present in plant and animal cells and has been shown to be involved in a variety of cellular mechanisms including transcription regulation, cell cycle control, and phosphorylation cascades. We now show that it is also involved in the mechanisms of action of nuclear receptors and of their coactivators.

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