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Ciz, a transcription factor with a nucleocytoplasmic shuttling activity, interacts with C-propeptides of type I

Tadayoshi Hayata1, Tetsuya Nakamoto, Yoichi Ezura

  • 1Department of Molecular Pharmacology, Medical Research Institute, Tokyo Medical and Dental University, 3-10 Kanda-Surugadai 2-Chome, Chiyoda-ku, Tokyo 101-0062, Japan.

Biochemical and Biophysical Research Communications
|January 24, 2008
PubMed

Insights

The Ciz protein interacts with type I collagen's C-propeptides within the cell nucleus. This finding sheds light on how Ciz influences bone formation and mass.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Ciz is a zinc finger transcription factor known for nucleocytoplasmic shuttling.
  • Ciz-deficient mice exhibit a high bone mass phenotype, suggesting Ciz suppresses bone formation.

Purpose of the Study:

  • To identify binding partners of Ciz to understand its role in bone formation suppression.
  • To investigate the interaction between Ciz and extracellular matrix proteins.

Main Methods:

  • Yeast two-hybrid screening to identify Ciz binding partners.
  • In vitro co-immunoprecipitation assays with in vitro translated proteins.
  • In vivo immunoprecipitation in COS-7 cells to confirm protein associations and localization.

Main Results:

  • Yeast two-hybrid screening identified extracellular matrix proteins, including Col1a1 and Col1a2, as Ciz binding partners.
  • In vitro and in vivo experiments confirmed direct binding of Ciz to the C-propeptides of type I collagen (Col1a1 and Col1a2).
  • Overexpressed Ciz and type I collagen C-propeptides were found to co-localize in the nucleus.

Conclusions:

  • Ciz directly interacts with the C-propeptides of type I collagen.
  • This interaction occurs within the cell nucleus, suggesting a novel regulatory mechanism for bone formation involving Ciz and collagen processing.

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