What question did this study set out to answer?

To investigate the binding properties of ryanodine to calcium release channels in heart and skeletal muscle and its functional implications.

February 21, 1989Biochemistry

Positive cooperativity of ryanodine binding to the calcium release channel of sarcoplasmic reticulum from heart and skeletal muscle

Q: What is the clinical evidence from this study?

Intervention: Ryanodine. Primary outcome: Ryanodine binding characteristics (KD1, KD2, dissociation rates).

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Key result

Ryanodine binding to the low-affinity site decreases the dissociation rate constant of the high-affinity site, demonstrating positive cooperativity in heart and skeletal muscle sarcoplasmic reticulum.

Authors

SMSusan G. McGrewMonroe Carell Jr. Children's Hospital CWCharles D. WollebenMerck & Co., Inc., Rahway, NJ, USA (United States)PSPeter K. S. SieglAstraZeneca (United Kingdom)

Discussion

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Implication

Characterizes dual ryanodine affinities in skeletal SR; extends Ca2+ release channel insights but leaves open cardiac disease relevance.

Key Points

To investigate the binding properties of ryanodine to calcium release channels in heart and skeletal muscle and its functional implications.
Compared the binding affinity of ryanodine in the sarcoplasmic reticulum of heart and skeletal muscle.
Measured dissociation rates for high-affinity ryanodine binding in both muscle types.
Analyzed the relationship between binding sites and dissociation rates using equilibrium binding techniques.
Identified high-affinity (KD1 approximately 5-10 nM) and low-affinity (KD2 approximately 3 microM) binding sites in skeletal muscle.
Measured high-affinity dissociation rates for both heart and skeletal muscle (t1/2 approximately 30-40 min).
Established that ryanodine binding to low-affinity sites locks high-affinity sites, demonstrating positive cooperativity.

PICO

Exposure / Comparator

Ryanodine

Primary Outcome

Ryanodine binding characteristics (KD1, KD2, dissociation rates)

Cite This Study

McGrew et al. (1989) studied this question. Ryanodine was evaluated on Ryanodine binding characteristics (KD1, KD2, dissociation rates). Ryanodine binding to the low-affinity site decreases the dissociation rate constant of the high-affinity site, demonstrating positive cooperativity in heart and skeletal muscle sarcoplasmic reticulum.

synapsesocial.com/papers/6a6f21876c240de38cdb6519 https://doi.org/10.1021/bi00430a039

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Positive cooperativity of ryanodine binding to the calcium release channel of sarcoplasmic reticulum from heart and skeletal muscle

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

Positive cooperativity of ryanodine binding to the calcium release channel of sarcoplasmic reticulum from heart and skeletal muscle

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

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Also Consider