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The α2δ-1 Subunit Remodels CaV1.2 Voltage Sensors, Allowing for Ca2+ Influx at Physiological Membrane Potentials
Department of Anesthesiology, Division of Molecular Medicine, David Geffen School of Medicine, University of California, Los Angeles, USA.
Department of Anesthesiology, Division of Molecular Medicine, David Geffen School of Medicine, University of California, Los Angeles, USA.
dPET, Spokane, USA.
Department of Medicine (Cardiology), and Department of Physiology, and Cardiovascular Research Laboratories, David Geffen School of Medicine, University of California, Los Angeles, USA.
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2016 (English)In: The Journal of General Physiology, ISSN 0022-1295, E-ISSN 1540-7748, Vol. 148, no 2, p. 147-159Article in journal (Refereed) Published
Abstract [en]

Excitation-evoked calcium influx across cellular membranes is strictly controlled by voltage-gated calcium channels (CaV), which possess four distinct voltage-sensing domains (VSDs) that direct the opening of a central pore. The energetic interactions between the VSDs and the pore are critical for tuning the channel’s voltage dependence. The accessory α2δ-1 subunit is known to facilitate CaV1.2 voltage-dependent activation, but the underlying mechanism is unknown. In this study, using voltage clamp fluorometry, we track the activation of the four individual VSDs in a human L-type CaV1.2 channel consisting of α1C and β3 subunits. We find that, without α2δ-1, the channel complex displays a right-shifted voltage dependence such that currents mainly develop at nonphysiological membrane potentials because of very weak VSD–pore interactions. The presence of α2δ-1 facilitates channel activation by increasing the voltage sensitivity (i.e., the effective charge) of VSDs I–III. Moreover, the α2δ-1 subunit also makes VSDs I–III more efficient at opening the channel by increasing the coupling energy between VSDs II and III and the pore, thus allowing Ca influx within the range of physiological membrane potentials.

Place, publisher, year, edition, pages
Rockefeller University Press, 2016. Vol. 148, no 2, p. 147-159
National Category
Biophysics Physiology
Identifiers
URN: urn:nbn:se:liu:diva-162185DOI: 10.1085/jgp.201611586OAI: oai:DiVA.org:liu-162185DiVA, id: diva2:1371978
Available from: 2019-11-21 Created: 2019-11-21 Last updated: 2019-11-26Bibliographically approved

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