Key result
DHPR alpha1S II-III loop drives skeletal-specific tetrad arrangement while the cardiac loop inhibits it.
Population
Dysgenic (alpha(1S)-null) myotubes
Comparison
Reconstitution with distinct alpha subunit… vs Reconstitution with alpha and chimeras with a…
Design
Preclinical
Authors
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Distinguishes skeletal from cardiac DHPR arrangement mechanisms; hypothesis-generating for targeted interventions in excitation-contraction coupling disorders.
The organization of DHPRs in tetrads is necessary but not sufficient for skeletal-type excitation-contraction coupling, and the cardiac II-III loop has an inhibitory role in tetrad formation.
Takekura et al. (2004) studied Skeletal muscle excitation-contraction coupling. alpha(1S) subunit isoforms and II-III loop chimeras vs. alpha(1C) and cardiac II-III loop chimeras was evaluated on Arrangement of DHPRs in arrays of tetrads and skeletal-type e-c coupling. The essential II-III loop sequence (L720-L764) of the DHPR alpha(1S) subunit is necessary for the skeletal-specific arrangement of DHPRs in arrays of tetrads, while the cardiac loop inhibits it.
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