A solid-supported membrane electrophysiology assay for efficient characterization of ion-coupled transport.

A solid-supported membrane electrophysiology assay for efficient characterization of ion-coupled transport.
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DOI:
10.1016/j.jbc.2021.101220
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发表时间:
2021-10
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
Henzler-Wildman KA
Henzler-Wildman KA
中科院分区:
其他
文献类型:
--
作者:
Thomas NE;Feng W;Henzler-Wildman KA

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Transport stoichiometry determination can provide great insight into the mechanism and function of ion-coupled transporters. Traditional reversal potential assays are a reliable, general method for determining the transport stoichiometry of ion-coupled transporters, but the time and material costs of this technique hinder investigations of transporter behavior under multiple experimental conditions. Solid-supported membrane electrophysiology (SSME) allows multiple recordings of liposomal or membrane samples adsorbed onto a sensor and is sensitive enough to detect transport currents from moderate-flux transporters that are inaccessible to traditional electrophysiology techniques. Here, we use SSME to develop a new method for measuring transport stoichiometry with greatly improved throughput. Using this technique, we were able to verify the recent report of a fixed 2:1 stoichiometry for the proton:guanidinium antiporter Gdx, reproduce the 1H+:2Cl− antiport stoichiometry of CLC-ec1, and confirm loose proton:nitrate coupling for CLC-ec1. Furthermore, we were able to demonstrate quantitative exchange of internal contents of liposomes adsorbed onto SSME sensors to allow multiple experimental conditions to be tested on a single sample. Our SSME method provides a fast, easy, general method for measuring transport stoichiometry, which will facilitate future mechanistic and functional studies of ion-coupled transporters.
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