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The interaction of KCTD1 with transcription factor AP-2alpha inhibits its transactivation

Xiaofeng Ding1, Chang Luo, Jianlin Zhou

  • 1Model Animal Research Center, Nanjing University, Nanjing 210089, PR China.

Journal of Cellular Biochemistry
|December 31, 2008
PubMed

Insights

Potassium channel tetramerization domain-containing 1 (KCTD1) interacts with the AP-2 transcription factor. KCTD1 specifically represses AP-2alpha

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Transcription factor AP-2 (Activating Protein-2) is crucial for mammalian development, cell proliferation, apoptosis, and carcinogenesis.
  • Identifying AP-2 interacting partners is key to understanding its regulatory mechanisms.

Purpose of the Study:

  • To identify novel AP-2alpha interacting proteins.
  • To characterize the functional interaction between KCTD1 and AP-2alpha.

Main Methods:

  • Yeast two-hybrid screen using a human brain cDNA library.
  • In vitro GST pull-down and in vivo co-immunoprecipitation assays.
  • Mammalian cell co-localization studies and transient transfection assays with AP-2-binding site promoters.
  • siRNA-mediated knockdown of KCTD1.

Main Results:

  • KCTD1 was identified as an AP-2alpha interacting partner.
  • The interaction was confirmed in vitro and in vivo, with binding domains mapped to the N-termini of both proteins.
  • KCTD1 specifically repressed AP-2alpha-mediated transactivation, and this repression was relieved by KCTD1 siRNA.
  • KCTD1 also inhibited the transcriptional activity of other AP-2 family members.

Conclusions:

  • KCTD1 functions as a novel transcriptional repressor for the AP-2 family, particularly AP-2alpha.
  • This interaction provides new insights into the regulation of AP-2 transcriptional activity.

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