Key result
Substituting hydrophobic residues in troponin C with glutamine altered calcium affinities up to 243-fold, with Phe26Gln and Ile62Gln mutations drastically reducing force recovery.
Specific hydrophobic residue mutations in troponin C significantly alter calcium binding affinity and exchange with troponin I, directly impacting muscle force production.
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These troponin C mutations affect Ca2+ affinity and force in animals; leaves open human cardiomyopathy relevance.
Davis et al. (2004) studied this question. Substitution of hydrophobic residues in troponin C with polar Gln was evaluated on Calcium binding, dynamics, and calcium sensitivity of force production. Substituting hydrophobic residues in troponin C with glutamine altered calcium affinities up to 243-fold, with Phe26Gln and Ile62Gln mutations drastically reducing force recovery.
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