Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1859, Issue 12, Pages 2373-2380Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbamem.2017.09.002
Keywords
K-v channels; DIB; Oxonol VI; Proteoliposomes
Categories
Funding
- FRISBI [ANR-10-INSB-05-02]
- GRAL within the Grenoble Partnership for Structural Biology (PSB) [ANR-10-LABX-49-01]
- ANR VenomPicoScreen [ANR-11-RPIB-022-04]
- Labex Ion Channels, Science and Therapeutics [ANR-11-LABX-0015]
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The study of ion channel activity and the screening of possible inhibitor molecules require reliable methods for production of active channel proteins, their insertion into artificial membranes and for the measurement of their activity. Here we report on cell-free expression of soluble and active K(v)1.1 and K(v)1.3 channels and their efficient insertion into liposomes. Two complementary methods for the determination of the electrical activity of the proteoliposome-embedded channels were compared using K(v)1.1 as a model system: (1) single channel recordings in droplet interface bilayers (DIB) and (2) measurement of the membrane voltage potential generated by a potassium ion diffusion potential using the voltage-sensitive fluorescent dye oxonol VI. Single channel recordings in DIBs proved unreliable because of the non-reproducible fusion of proteoliposomes with an artificial membrane. Therefore, the use of the optical indicator oxonol VI was adapted for 96 well microtiter plates using the ionophore valinomycin as a positive control. The activity of K(v)1.1 and K(v)1.3 channels was then monitored in the absence and presence of different venom toxins, demonstrating that fluorescent dyes can be used very efficiently when screening small molecules for their channel blocking activity.
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