Key result
Hydrophobic residue mutations in troponin C drastically affected calcium binding, but sensitizing isolated TnC to calcium did not necessarily increase calcium sensitivity of the troponin complex.
Population
Isolated troponin C and increasingly complex biochemical systems
Comparison
Individual substitution of five hydrophobic… vs Unmutated/wild-type troponin C (implied)
Design
Preclinical
Authors
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Isolated TnC findings may not predict complex behavior; leaves open optimal systems for troponin-targeted research.
Both the intrinsic properties of troponin C and its interactions with other contractile proteins are crucial in modulating calcium binding in complex biochemical systems.
Tikunova et al. (2010) studied this question. Substitution of hydrophobic residues with polar Gln in troponin C was evaluated on Calcium binding and exchange with TnC and calcium sensitivity of actomyosin ATPase. Hydrophobic residue mutations in troponin C drastically affected calcium binding, but sensitizing isolated TnC to calcium did not necessarily increase calcium sensitivity of the troponin complex.
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