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Human spot 14 protein interacts physically and functionally with the thyroid receptor

Wei-Yuan Chou1, Yi-Shan Cheng, Ching-Liang Ho

  • 1Department of Biochemistry, National Defense Medical Center, Taipei 114, Taiwan, ROC.

Biochemical and Biophysical Research Communications
|April 10, 2007
PubMed

Insights

Spot 14 (S14) protein may form homodimers and interact with the thyroid hormone receptor (TR). This interaction suggests S14 acts as a cofactor in TR-mediated gene regulation, potentially impacting lipogenesis in cancer.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Spot 14 (S14) is an acidic protein with unknown function.
  • Human S14 (hS14) is found in the nucleus and amplified in some cancers, suggesting a role in tumorigenesis.
  • hS14 may regulate lipogenic enzymes.

Purpose of the Study:

  • To elucidate the biochemical function and interactions of human S14 (hS14).
  • To investigate the potential role of hS14 in cancer and gene regulation.

Main Methods:

  • Purification of untagged hS14 protein.
  • Analytical ultracentrifugation to assess protein dimerization.
  • Biochemical assays to identify interactions with thyroid hormone receptor (TR).

Main Results:

  • hS14 was purified and shown to potentially form homodimers.
  • Evidence suggests physical and functional interactions between hS14 and TR.
  • hS14 exhibits cell-type-dependent functions, acting as a cofactor for TR.

Conclusions:

  • hS14 may function as a cofactor for the thyroid hormone receptor (TR).
  • hS14 regulates malic enzyme gene expression in a TR-dependent manner.
  • These findings provide a molecular basis for hS14's role in TR-mediated gene transcription.

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