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Biochim Biophys Acta. 2008 Dec;1779(12):805-10. doi: 10.1016/j.bbagrm.2008.08.001. Epub 2008 Aug 9.

KyoT3, an isoform of murine FHL1, associates with the transcription factor RBP-J and represses the RBP-J-mediated transactivation.

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1
State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an 710032, PR China.

Abstract

Previously, we have shown that KyoT2, an isoform of the four and a half LIM domain protein 1 (FHL1), modulates Notch signaling via repressing RBP-J-mediated transactivation. In this study, we investigated the effect of another isoform of FHL1, KyoT3, on transactivation of a RBP-J-dependent promoter. We found that KyoT3 was expressed widely in a variety of tissues. By constructing EGFP fusion proteins, we showed that KyoT3 locates preferentially in nucleus. KyoT3 interacted with RBP-J, as shown by co-immunoprecipitation assays. Moreover, we demonstrated by a reporter assay that KyoT3 repressed transactivation of a RBP-J-dependent promoter, which was activated by both the Notch intracellular domain and Epstein-Barr virus nuclear antigen 2, an EB virus-encoded oncoprotein. These results suggest a multi-elemental control of the Notch signaling pathway, which is critical for cell differentiation in development.

PMID:
18760388
DOI:
10.1016/j.bbagrm.2008.08.001
[Indexed for MEDLINE]
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