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Updated: Jul 26, 2026

Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

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Published on: July 27, 2016

The alpha1S N-terminus is not essential for bi-directional coupling with RyR1.

R A Bannister¹, K G Beam

¹Department of Biomedical Sciences, Neurosciences Division, Colorado State University, Fort Collins, CO 80523, USA.

Biochemical and Biophysical Research Communications

|September 6, 2005

Summary

The N-terminus of the dihydropyridine receptor (DHPR) is crucial for its function in skeletal muscle. Specifically, the proximal N-terminus is essential for sarcolemmal expression and excitation-contraction coupling.

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Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

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Functional Characterization of Endogenously Expressed Human RYR1 Variants

Functional Characterization of Endogenously Expressed Human RYR1 Variants

Published on: June 9, 2021

Area of Science:

Muscle physiology
Molecular biology
Calcium channel research

Background:

The dihydropyridine receptor (DHPR) alpha(1S) II-III loop is vital for skeletal muscle excitation-contraction (EC) coupling.
The role of other cytoplasmic regions, particularly the N-terminus (residues 1-51), in DHPR function remains largely unknown.

Purpose of the Study:

To investigate the importance of the N-terminal residues of the DHPR alpha(1S) subunit for its function in EC coupling.
To determine the specific regions within the N-terminus critical for Ca(2+) channel activity and sarcolemmal targeting.

Main Methods:

Site-directed mutagenesis to delete specific N-terminal residues of the alpha(1S) subunit.
Confocal microscopy to assess sarcolemmal insertion of the DHPR.
Measurement of charge movement to evaluate voltage-sensing capabilities.

Main Results:

Deletion of residues 2-37, weakly conserved in other L-type Ca(2+) channels, had minimal impact on Ca(2+) channel or voltage-sensing function.
Removal of residues 2-47, including conserved regions, led to a complete loss of DHPR function.
Confocal microscopy and charge movement assays revealed that deletion of residues 2-47 resulted in failed sarcolemmal insertion of the DHPR.

Conclusions:

The distal, weakly conserved N-terminus of DHPR alpha(1S) is not essential for EC coupling or Ca(2+) channel activity.
The integrity of the proximal N-terminus of DHPR alpha(1S) is indispensable for its proper expression at the sarcolemma.