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Voltage sensor for excitation-contraction coupling
- Molecular classification
- Ion channel, Voltage-gated calcium channel, Membrane protein
01
Overview
The voltage sensor responsible for excitation-contraction (EC) coupling in skeletal muscle is a specialized molecular module within the CaV1.1 L-type calcium channel (also known as the dihydropyridine receptor, DHPR). This sensor detects changes in membrane potential and transduces this electrical signal into mechanical activation of ryanodine receptor 1 (RyR1) channels on the sarcoplasmic reticulum, leading to rapid calcium release and muscle contraction. The voltage-sensing domains (VSDs) within CaV1.1, particularly VSD-I, undergo conformational rearrangements upon membrane depolarization, triggering RyR1 opening. Divalent cations, especially Ca2+, are essential for the sensor's function by binding at a "priming" site.
- Other names
- Dihydropyridine receptor (DHPR)CaV1.1 L-type calcium channelVoltage-sensing domains (VSDs) of CaV1.1
02
Mechanism of action
Voltage-dependent modulation of calcium channel activity; direct interaction with ryanodine receptor (RyR1)
03
Biological functions
Excitation-contraction couplingCalcium signalingVoltage sensingMuscle contraction
04
Disease associations
Malignant hyperthermiaHypokalemic periodic paralysisHyperkalemic periodic paralysisMuscle disorders
05
Safety considerations
Potential for altered muscle contractilityCardiac effects due to L-type calcium channel modulation in other tissues
06
Interacting drugs
Dihydropyridines (e.g., nifedipine, amlodipine)
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