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Cell Growth & Differentiation Vol. 13, 69-75, February 2002
© 2002 American Association for Cancer Research

Interaction between the Hematopoietic Ets Transcription Factor Spi-B and the Coactivator CREB-binding Protein Associated with Negative Cross-talk with c-Myb1

Hitomi Yamamoto, Fumiko Kihara-Negishi, Toshiyuki Yamada, Mitsuhiro Suzuki, Tohru Nakano and Tsuneyuki Oikawa2

Department of Cell Genetics, Sasaki Institute, Tokyo 101-0062, Japan [H. Y., F. K-N., T. Y., M. S., T. O.], and Department of Molecular Cell Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan [T. N.]

We have previously shown that the hematopoietic Ets transcription factor PU.1 interacts with the transcriptional coactivator CREB-binding protein (CBP). In this study, we further investigated whether Spi-B, another hematopoietic Ets transcription factor, also interacts with CBP. Direct physical interaction of Spi-B with CBP was demonstrated by glutathione S-transferase binding assay. Analysis using several deletion mutants of Spi-B and CBP revealed that the NH2-terminal region including the activation domain of Spi-B interacted with the region spanning amino acid residues 1283–1915 of CBP in vitro. The interaction of Spi-B with CBP was also observed in vivo. CBP potentiated Spi-B-mediated transcription of the reporter gene driven by the multimerized PU.1/Spi-B binding sites. This transcriptional activation by Spi-B and CBP was inhibited by expression of c-Myb, and the transcriptional activation by c-Myb and CBP was inhibited by expression of Spi-B, suggesting competition for CBP between these two transcription factors. Our results suggest that CBP acts as a transcriptional coactivator of Spi-B and mediates synergistic or antagonistic interactions between other transcription factors.




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Molecular Cancer Research Cell Growth & Differentiation
Copyright © 2002 by the American Association of Cancer Research.