What question did this study set out to answer?

To investigate the structural changes in troponin C due to calcium binding and its implications for muscle contraction.

September 28, 2007

Calcium Binding to Skeletal Muscle Troponin C and the Regulation of Muscle Contraction

Q: What is the clinical evidence from this study?

Study design: Other. Population: Skeletal muscle contraction. Intervention: Three-dimensional structure determination of turkey skeletal troponin C. Primary outcome: Molecular structure and conformational changes of troponin C.

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Key result

Three-dimensional structure determination of turkey skeletal troponin C revealed an extended molecule with two domains, providing a model for Ca2+-induced conformational changes during muscle contraction.

Population

Turkey skeletal troponin C (TnC)

Design

Preclinical

Authors

OHOsnat HerzbergUniversity of Maryland, Baltimore JMJohn MoultResearch Institute for Bioscience and Biotechnology MJMichael N.G. JamesUniversity of Alberta

Discussion

Member takes

Implication

Does not change clinical practice; leaves open translation of troponin C structure to human cardiac regulation.

Key Points

To investigate the structural changes in troponin C due to calcium binding and its implications for muscle contraction.
Determined the three-dimensional structure of turkey skeletal troponin C at 2.8 A resolution
Refined the structure at 2.2 A resolution to analyze hydrogen-bonded networks and conformational changes
Identified two bound Ca2+ ions in the C-terminal domain and characterized the Ca2+-free N-terminal regulatory domain
Proposed a conformational transition when Ca2+ binds to the regulatory domain leading to exposure of a hydrophobic site for interaction with troponin I
Demonstrated that the Ca2+-bound conformation can be achieved without large energy barriers from the Ca2+-free state

Structured PICO

Population

Turkey skeletal troponin C (TnC)

Exposure

Three-dimensional structure determination at 2.8 A and 2.2 A resolution

Outcome

Three-dimensional structure of TnC and conformational changes upon Ca2+ bindingsurrogate

The study provides a structural basis for the regulation of skeletal muscle contraction by detailing the conformational changes in troponin C upon calcium binding.

Cite This Study

Herzberg et al. (2007) studied Skeletal muscle contraction. Three-dimensional structure determination of turkey skeletal troponin C was evaluated on Molecular structure and conformational changes of troponin C. Three-dimensional structure determination of turkey skeletal troponin C revealed an extended molecule with two domains, providing a model for Ca2+-induced conformational changes during muscle contraction.

synapsesocial.com/papers/6a21c82e78057b574207bfbb https://doi.org/10.1002/9780470513347.ch8

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Calcium Binding to Skeletal Muscle Troponin C and the Regulation of Muscle Contraction

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Calcium Binding to Skeletal Muscle Troponin C and the Regulation of Muscle Contraction

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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