Acetylation stabilises calmodulin-regulated calcium signalling

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Calmodulin is a crucial calcium-binding protein regulating diverse cellular processes.
• Amino-terminal acetylation is a widespread post-translational modification affecting protein stability and function.

Purpose of the Study:

• To investigate the impact of amino-terminal acetylation on the structure and calcium signaling function of fission yeast calmodulin.
• To determine if this modification affects human calmodulin's calcium-binding capacity.

Main Methods:

• Structural analysis of acetylated and non-acetylated Schizosaccharomyces pombe calmodulin.
• Assessment of calmodulin's interaction with myosin at endocytic sites.
• Calcium-binding assays for yeast and human calmodulins.

Main Results:

• NatA-dependent acetylation stabilizes the helical structure of Schizosaccharomyces pombe calmodulin.
• Acetylation impacts calmodulin's association with myosin at endocytic foci.
• This modification alters the calcium-binding capacity of both yeast and human calmodulins.

Conclusions:

• Amino-terminal acetylation is a significant regulator of calmodulin structure and function.
• The findings highlight the functional importance of this conserved post-translational modification in calcium signaling.
• Implications for understanding calmodulin's role in cellular processes and disease.