PMID- 10722692 OWN - NLM STAT- MEDLINE DCOM- 20000427 LR - 20210209 IS - 0021-9258 (Print) IS - 0021-9258 (Linking) VI - 275 IP - 12 DP - 2000 Mar 24 TI - JAB1 interacts with both the progesterone receptor and SRC-1. PG - 8540-8 AB - 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. FAU - Chauchereau, A AU - Chauchereau A AD - INSERM U 135 Hormones, Genes et Reproduction, Hopital de Bicetre, 78 rue du General Leclerc, 94275 Le Kremlin Bicetre, France. FAU - Georgiakaki, M AU - Georgiakaki M FAU - Perrin-Wolff, M AU - Perrin-Wolff M FAU - Milgrom, E AU - Milgrom E FAU - Loosfelt, H AU - Loosfelt H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Biol Chem JT - The Journal of biological chemistry JID - 2985121R RN - 0 (DNA-Binding Proteins) RN - 0 (Receptors, Cytoplasmic and Nuclear) RN - 0 (Receptors, Glucocorticoid) RN - 0 (Receptors, Progesterone) RN - 0 (Recombinant Proteins) RN - 0 (Transcription Factor AP-1) RN - 0 (Transcription Factors) RN - EC 2.3.1.48 (Histone Acetyltransferases) RN - EC 2.3.1.48 (Nuclear Receptor Coactivator 1) RN - EC 3.4.- (Peptide Hydrolases) SB - IM MH - Binding Sites MH - DNA-Binding Proteins/genetics/*metabolism MH - Histone Acetyltransferases MH - Nuclear Receptor Coactivator 1 MH - Peptide Hydrolases MH - Protein Binding MH - Receptors, Cytoplasmic and Nuclear/metabolism MH - Receptors, Glucocorticoid/metabolism MH - Receptors, Progesterone/*metabolism MH - Recombinant Proteins/metabolism MH - Signal Transduction MH - Transcription Factor AP-1/metabolism MH - Transcription Factors/genetics/*metabolism MH - Two-Hybrid System Techniques EDAT- 2000/03/18 09:00 MHDA- 2000/04/29 09:00 CRDT- 2000/03/18 09:00 PHST- 2000/03/18 09:00 [pubmed] PHST- 2000/04/29 09:00 [medline] PHST- 2000/03/18 09:00 [entrez] AID - S0021-9258(18)30158-3 [pii] AID - 10.1074/jbc.275.12.8540 [doi] PST - ppublish SO - J Biol Chem. 2000 Mar 24;275(12):8540-8. doi: 10.1074/jbc.275.12.8540.