Key result
Charge neutralization or deletion in the RyR1 K3495-R3502 cluster severely depresses DHPR-coupled Ca2+ transients.
Population
Dyspedic myotubes and in vitro binding models
Comparison
Mutations in the KKKRR_ _R cluster of RyR1 vs Wild-type or unmutated state
Design
Preclinical
Authors
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Disrupts RyR1-DHPR coupling in skeletal muscle models; hypothesis-generating for excitation-contraction mechanisms, pending human validation.
The DHPR beta-subunit interacts directly with RyR1 and is critical for generating high-speed Ca2+ signals coupled to membrane depolarization in skeletal muscle.
Cheng et al. (2005) studied Skeletal muscle excitation-contraction coupling. Mutations in the K(3495)KKRR_ _R(3502) cluster of RyR1 vs. Wild-type RyR1 was evaluated on Magnitude of RyR1-mediated Ca(2+) transients coupled to voltage-dependent activation of the DHPR. Charge neutralization or deletion in the K(3495)KKRR_ _R(3502) cluster of RyR1 severely depressed the magnitude of RyR1-mediated Ca(2+) transients coupled to DHPR activation.
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