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Calmodulin binds to inv protein: implication for the regulation of inv function.
1Laboratory of Molecular Embryology, Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Development, Growth & Differentiation
|December 12, 2001
Summary
Calmodulin binding to the inv protein regulates left-right asymmetry in vertebrates. The IQ2 site is crucial for this process, impacting embryonic development and gene expression patterns.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Left-right asymmetry is vital for vertebrate organ development.
- The mouse inv mutant exhibits reversed asymmetry, but its gene function remains unclear.
Purpose of the Study:
- To elucidate the biochemical and cell biological functions of the mouse inv gene.
- To investigate the role of calmodulin in regulating inv protein function.
- To understand the molecular mechanisms underlying left-right asymmetry determination.
Main Methods:
- Calmodulin binding assays to identify interaction sites on the mouse inv protein.
- mRNA injection into Xenopus embryos to assess inv function in vivo.
- Analysis of gene expression patterns (Xnr-1, Pitx2) following inv mRNA injection.
Main Results:
- Calmodulin binds to mouse inv protein at two sites, IQ1 and IQ2.
- Binding to the IQ2 site is calcium-independent.
- Injection of inv mRNA randomized left-right asymmetry in Xenopus embryos.
- A specific region (IQ2 site) of inv is essential for this randomization effect.
Conclusions:
- Calmodulin binding, particularly at the IQ2 site, is critical for regulating inv protein function in establishing left-right asymmetry.
- A model for calcium-calmodulin regulation of inv is proposed.
- These findings offer insights into the molecular basis of vertebrate organ development.