Key result
Coexpression of beta4 in Xenopus oocytes produces a reduced hyperpolarizing shift in the I-V curve of the alpha1A channel compared with beta3, an effect abolished by replacing the amino terminus.
Population
Xenopus oocytes
Comparison
Coexpression of beta4 subunit with alpha1A… vs Coexpression of beta3 subunit with alpha1A…
Design
Preclinical
Authors
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Identifies novel Ss1 interaction site in alpha1A; extends subtype-specific beta modulation mapping but leaves clinical relevance open.
The study identifies a new subtype-specific interaction between the amino-terminal domain of alpha1A and the carboxyl terminus of beta4 that controls P/Q-type calcium channel activation.
Walker et al. (1999) studied this question. Coexpression of beta4 in Xenopus oocytes vs. beta3 was evaluated on Hyperpolarizing shift in the I-V curve of the alpha1A channel. Coexpression of beta4 in Xenopus oocytes produces a reduced hyperpolarizing shift in the I-V curve of the alpha1A channel compared with beta3, an effect abolished by replacing the amino terminus.
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