Does calcium bind to troponin or tropomyosin?
Understand the Problem
The question is asking about the interaction between calcium ions and specific proteins (troponin and tropomyosin) in muscle contraction. It seeks to clarify which of these two proteins calcium binds to during the physiological process.
Answer
Calcium binds to troponin.
The final answer is calcium binds to troponin.
Answer for screen readers
The final answer is calcium binds to troponin.
More Information
Calcium binds specifically to the troponin C subunit of troponin, initiating a conformational change that leads to the movement of tropomyosin and the exposure of myosin-binding sites on actin filaments.
Sources
- Mechanism of the calcium-regulation of muscle contraction - NCBI - ncbi.nlm.nih.gov
- Troponin and tropomyosin regulate contraction via calcium binding - nature.com
- Calcium Regulation Of Contraction - MCAT Content - Jack Westin - jackwestin.com
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