Crenomytilus grayanus 40kDa calponin-like protein: cDNA cloning, sequence analysis, tissue expression, and...

Area of Science:

• Marine biology
• Molecular biology
• Biochemistry

Background:

• Calponin-like protein (CaP-40) is a significant component of Ca2+-regulated thin filaments in mussel Crenomytilus grayanus.
• CaP-40 shares structural and biochemical similarities with vertebrate smooth muscle calponin.

Purpose of the Study:

• To characterize the full-length cDNA sequence of CaP-40.
• To investigate the expression patterns of CaP-40 at mRNA and protein levels.
• To analyze CaP-40 post-translational modifications and protein-protein interactions.

Main Methods:

• Full-length cDNA sequencing.
• Gene expression analysis (mRNA and protein levels).
• Mass spectrometry for proteome analysis.
• Protein-protein interaction network construction.

Main Results:

• The CaP-40 cDNA sequence comprises 398 amino acids with high homology to other molluscan calponins.
• CaP-40 gene is broadly expressed across mussel tissues, notably in the adductor and mantle muscles.
• High mRNA levels correlate with high protein abundance in adductor smooth muscles.
• CaP-40 undergoes N- and C-terminal acetylation at specific sites (N127, G229, G349), suggesting functional regulation.

Conclusions:

• CaP-40 is a widely distributed protein in mussel tissues, particularly abundant in adductor and mantle muscles.
• Post-translational modifications, such as acetylation, likely play a role in regulating CaP-40 function in vivo.
• The study provides insights into the functional role and interactions of CaP-40 within the mussel contractile system.