What is the clinical evidence from this study?

Study design: Other. Intervention: Substitution of hydrophobic residues with polar Gln in TnC(F29W). Primary outcome: Ca2+ binding affinities, association rates, and dissociation rates.

May 1, 2002Biochemistry

Effect of Hydrophobic Residue Substitutions with Glutamine on Ca2+Binding and Exchange with the N-Domain of Troponin C

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Key result

Substituting hydrophobic residues with glutamine in the N-domain of Troponin C altered Ca2+ affinities up to 2340-fold, primarily by changing Ca2+ dissociation and association rates.

Population

Fluorescent TnC(F29W) protein model

Design

Preclinical

Authors

STSvetlana B. TikunovaThe Ohio State University JRJack A. RallThe Ohio State University JDJonathan P. DavisThe Ohio State University Wexner Medical Center

Discussion

Member takes

Implication

Does not warrant clinical changes in Ca2+ handling; leaves open TnC engineering for cardiac research.

Key Points

This research investigates how substituting hydrophobic residues with glutamine affects calcium binding in troponin C.
Systematic substitution of 27 hydrophobic residues in troponin C with polar glutamine.
Measurement of calcium affinities and rates of association and dissociation for TnC(F29W) mutants.
Analysis of the effects of mutations on binding properties in different structural states.
A range of 2340-fold variability in calcium affinities among TnC(F29W) mutants was observed.
Greater than 2-fold increases in calcium affinities were attributed mainly to slower calcium dissociation rates.
Contextual effects of hydrophobic mutations indicate important contributions to calcium binding despite no direct correlation with solvent accessibility.

Structured PICO

Population

Fluorescent TnC(F29W) protein model

Intervention

Individual substitution of 27 Phe, Ile, Leu, Val, and Met residues with polar Gln

Outcome

Ca(2+) binding and exchange properties (affinity, association rates, dissociation rates)surrogate

Single hydrophobic residues in Troponin C that do not directly ligate Ca2+ play a crucial role in controlling Ca2+ binding and exchange within the EF-hand system.

Cite This Study

Tikunova et al. (2002) studied this question. Substitution of hydrophobic residues with polar Gln in TnC(F29W) was evaluated on Ca2+ binding affinities, association rates, and dissociation rates. Substituting hydrophobic residues with glutamine in the N-domain of Troponin C altered Ca2+ affinities up to 2340-fold, primarily by changing Ca2+ dissociation and association rates.

synapsesocial.com/papers/6a56cf0e7d812fb23aa363dc https://doi.org/10.1021/bi011763h

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Effect of Hydrophobic Residue Substitutions with Glutamine on Ca2+Binding and Exchange with the N-Domain of Troponin C

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Effect of Hydrophobic Residue Substitutions with Glutamine on Ca2+Binding and Exchange with the N-Domain of Troponin C

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider