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CR6-Interacting Factor 1 Interacts with Orphan Nuclear Receptor Nur77 and Inhibits Its Transactivation

Laboratory of Endocrine Cell Biology (K.C.P., H.K.C., H.K., D.W.K., J.H.S., E.S.H., H.S.J., S.-H.P., M.S.), Department of Internal Medicine, Chungnam National University College of Medicine, Deajeon 301-721 Korea; Keimyung University School of Medicine (I.K.L.), Jung-Gu, Daegu 700-712, Korea; Hormone Research Center (K.-H.S., H.-S.C.), School of Biological Sciences and Technology, Chonnam National University, Kwangju 500-757, Korea; and Department of Oncology (I.B.), Lombardi Cancer Center, Georgetown University Medical Center, Northwest, Washington, D.C. 20057

Address all correspondence and requests for reprints to: Minho Shong, Laboratory of Endocrine Cell Biology, Department of Internal Medicine, Chungnam National University College of Medicine, 640 Daesadong Chungku Daejeon 301-721, Korea. E-mail: minhos{at}cnu.ac.kr; or Hueng-Sik Choi, Hormone Research Center, Chonnam National University, Kwangju, 500-757 Korea. E-mail: hsc{at}chonnam.ac.kr.

CR6-interacting factor 1 (CRIF1) was recently identified as a nuclear protein that interacts with the Gadd45 (growth arrest and DNA damage inducible 45) family of proteins and participates in the regulation of the G1/S phase of the cell cycle. However, the nuclear action of CRIF1 is largely unknown. In this study, we demonstrate that CRIF1 acts as a novel coregulator of transactivation of the orphan nuclear receptor Nur77. Both in vitro and in vivo studies show that CRIF1 interacts with Nur77 via the Nur77 AB domain and that it dramatically inhibits the AB domain-mediated transactivation of Nur77. Transient transfection assays demonstrate that CRIF1 inhibits steroid receptor coactivator-2-mediated Nur77 transactivation, and silencing of endogenous CRIF1 by small interfering RNA relieves this repression. CRIF1 possesses intrinsic repressor activities that are not affected by the histone deacetylase inhibitor Trichostatin A. In addition, overexpression of CRIF1 inhibits TSH/protein kinase A-induced Nur-responsive element promoter activity. CRIF1 inhibited Nur77-dependent induction of E2F1 promoter activity, mRNA expression, and Nur77-mediated G1/S progression in cell cycle. These results suggest that CRIF1 acts as a repressor of the orphan nuclear receptor Nur77 by inhibiting AB domain-mediated transcriptional activity.

NURSA Molecule Pages Link:

Nuclear Receptors:   knrl  |  TRα  |  CAR  |  RXRα  |  ERRγ  |  GR  |  AR  |  NGFIB  |  SF-1

Coregulators:   CRIF1  |  SRC-1  |  GRIP1  |  SMRT

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