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Molecular and Cellular Biology, September 2007, p. 6506-6519, Vol. 27, No. 18
0270-7306/07/$08.00+0     doi:10.1128/MCB.01515-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Tip60 Histone Acetyltransferase Acts as a Negative Regulator of Notch1 Signaling by Means of Acetylation{triangledown}

Mi-Yeon Kim, Eun-Jung Ann, Jin-Young Kim, Jung-Soon Mo, Ji-Hye Park, Sun-Yee Kim, Mi-Sun Seo, and Hee-Sae Park*

Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Yongbong-dong, Buk-ku, Gwangju 500-757, Republic of Korea

Received 15 August 2006/ Returned for modification 14 December 2006/ Accepted 29 June 2007

The Notch signaling pathway appears to perform an important function in a wide variety of organisms and cell types. In our present study, we provide evidence that UV irradiation-induced Tip60 proteins reduced Notch1 activity to a marked degree. Accumulated UV irradiation-induced Tip60 suppresses Notch1 transcriptional activity via the dissociation of the Notch1-IC-CSL complex. The binding between endogenous Tip60 and Notch1-IC in UV radiation-exposed cells was verified in this study by coimmunoprecipitation. Interestingly, the physical interaction of Tip60 with Notch1-IC occurs to a more profound degree in the presence of CSL but does not exist in a trimeric complex. Using Notch1-IC and Tip60 deletion mutants, we also determined that the N terminus, which harbors the RAM domain and seven ankyrin repeats of Notch1-IC, interacts with the zinc finger and acetyl coenzyme A domains of Tip60. Furthermore, here we report that Notch1-IC is a direct target of the acetyltransferase activity of Tip60. Collectively, our data suggest that Tip60 is an inhibitor of the Notch1 signaling pathway and that Tip60-dependent acetylation of Notch1-IC may be relevant to the mechanism by which Tip60 suppresses Notch1 signaling.

* Corresponding author. Mailing address: School of Biological Sciences and Technology, Chonnam National University, Yongbong-dong, Buk-ku, Gwangju 500-757, South Korea. Phone: 82-62-530-0021. Fax: 82-62-530-2199. E-mail: proteome{at}jnu.ac.kr

{triangledown} Published ahead of print on 16 July 2007.

Molecular and Cellular Biology, September 2007, p. 6506-6519, Vol. 27, No. 18
0270-7306/07/$08.00+0     doi:10.1128/MCB.01515-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Gomez, E. B., Nugent, R. L., Laria, S., Forsburg, S. L. (2008). Schizosaccharomyces pombe Histone Acetyltransferase Mst1 (KAT5) Is an Essential Protein Required for Damage Response and Chromosome Segregation. Genetics 179: 757-771 [Abstract] [Full Text]  


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