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Nucleic Acids Research, 2003, Vol. 31, No. 24 7165-7174
© 2003 Oxford University Press

Article

Twist2, a novel ADD1/SREBP1c interacting protein, represses the transcriptional activity of ADD1/SREBP1c

Yun Sok Lee1, Hyoung Ho Lee1, Jiyoung Park1, Eung Jae Yoo1, Carlotta A. Glackin2, Young Il Choi1, Sung Ho Jeon1, Rho Hyun Seong1, Sang Dai Park3 and Jae Bum Kim*,1

1 School of Biological Sciences, Seoul National University, Seoul 151-742, Korea, 2 Division of Molecular Medicine, Beckman Research Institute of the City of Hope, Duarte, CA, USA and 3 International Vaccine Institute, Seoul 151-742, Korea

*To whom correspondence should be addressed. Tel: +82 2 880 5852; Fax: +82 2 878 5852; Email: jaebkim{at}snu.ac.kr

Adipocyte determination and differentiation dependent factor 1 (ADD1)/sterol regulatory element binding protein isoform (SREBP1c) is a key transcription factor in fatty acid metabolism and insulin- dependent gene expression. Although its transcriptional and post-translational regulation has been extensively studied, its regulation by interacting proteins is not well understood. To identify cellular proteins that associate with ADD1/SREBP1c, we employed the yeast two-hybrid system with an adipocyte cDNA library. Using the N-terminal domain of ADD1/SREBP1c as bait, we identified Twist2 (also known as Dermo-1), a basic helix–loop–helix (bHLH) protein, as a novel ADD1/SREBP1c interacting protein. Over-expression of Twist2 strongly repressed the transcriptional activity of ADD1/SREBP1c, primarily by reducing its binding to target sequences. Inhibition of histone deacetylase (HDAC) activity with HDAC inhibitors relieved this repression. Our data suggest that physical interaction between Twist2 and ADD1/SREBP1c attenuates transcriptional activation by ADD1/SREBP1c by inhibiting its binding to DNA, and that this inhibition is at least partly dependent on chromatin modification by HDACs.


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