Mouse NIPK interacts with ATF4 and affects its transcriptional activity

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  • 1Institute of Molecular and Cell Biology, Tartu University, Tartu, Estonia.

Experimental Cell Research
|May 17, 2003
PubMed

Insights

Neuronal cell death-inducible putative kinase (NIPK) regulates activating transcription factor 4 (ATF4) activity. This study identifies NIPK as a novel nuclear protein that binds ATF4, modulating its transcriptional function in neuronal cells.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Neuronal cell death-inducible putative kinase (NIPK) is a protein involved in neuronal cell death under stress conditions.
  • The function of NIPK remains largely unknown.
  • Activating transcription factor 4 (ATF4) is a transcription factor implicated in cellular stress responses.

Purpose of the Study:

  • To identify proteins that interact with mouse NIPK (mNIPK).
  • To elucidate the functional relationship between mNIPK and its interacting partners.
  • To investigate the role of mNIPK in regulating ATF4 transcriptional activity.

Main Methods:

  • Yeast two-hybrid screening of an embryonic mouse cDNA library.
  • Co-immunoprecipitation assays to confirm protein complex formation.
  • Transient transfection assays to assess transcriptional activity and protein localization.

Main Results:

  • Activating transcription factor 4 (ATF4) was identified as a binding partner of mNIPK.
  • The interaction domain was mapped to a 72-amino acid region in the N-terminus of ATF4.
  • mNIPK and ATF4 expression are upregulated in neuronal cells under calcium homeostasis disruption.
  • mNIPK inhibits ATF4-dependent transcriptional activation without affecting ATF4 degradation.
  • mNIPK and ATF4 form a complex in the nucleus and bind to CRE.

Conclusions:

  • mNIPK is a novel regulator of ATF4 transcriptional activity.
  • The interaction between mNIPK and ATF4 occurs in the nucleus.
  • mNIPK modulates ATF4 function by inhibiting its transcriptional activation, providing new insights into neuronal stress response pathways.

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