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A eukaryotic transcriptional represser with carboxypeptidase activity

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Abstract

ADIPOCYTE differentiation involves the transcriptional activation of several genes in triglyceride metabolism, including the adipose P2 (aP2 or 422) gene that encodes the adipocyte lipid-binding protein ALBP1–3. Within the mouse aP2 promoter region, the AE-1 sequence functions as either a positive or a negative element in the regulation of aP2 gene expression4–8. The AE-1 sequence is the binding site for the positive murine (3T3) adipocyte factor C/ EBP-α5,6, several human preadipocyte factors7, and a 3T3 pre-adipocyte factor(s) that has been implicated as a repressor of aP2 gene expression4,5,7,8. Here we report the cloning of new complementary DNAs that encode the 3T3 preadipocyte factor (termed AEBP1), and demonstrate that AEBP1 expression is abolished during adipocyte differentiation. Furthermore, we show that an activity of a carboxypeptidase associated with AEBP1 is important in the transcriptional repression function of AEBP1. Thus AEBP1 might represent a new type of transcription factor that regulates transcription by cleavage of factors involved in transcription.

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Author notes

  1. Hyo-Sung Ro: To whom correspondence should be addressed.

Authors and Affiliations

  1. Department of Biochemistry, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, B3H 4H7, Canada

    Gong-Ping He, Aleixo Muise, Audrey Wu Li & Hyo-Sung Ro

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  1. Gong-Ping He
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  2. Aleixo Muise
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  3. Audrey Wu Li
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  4. Hyo-Sung Ro
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He, GP., Muise, A., Li, A. et al. A eukaryotic transcriptional represser with carboxypeptidase activity. Nature 378, 92–96 (1995). https://doi.org/10.1038/378092a0

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