Yeast-Based Screening System for the Selection of Functional Light-Driven K⁺ Channels.

Area of Science:

• Biophysics
• Molecular Biology
• Neuroscience

Background:

• Ion channels are crucial for cellular electrical properties, regulating cell function through gating mechanisms.
• Controlling ion channels with external stimuli like light enables precise in vivo manipulation of cellular activities in living organisms.

Purpose of the Study:

• To engineer a synthetic light-gated potassium (K+) channel for remote control of cellular electrical properties.
• To evolve the light-gated channel for full control over pore gating using light stimuli.

Main Methods:

• Engineered a synthetic light-gated K+ channel by fusing an exogenous plant photoreceptor (LOV2 domain) to the Kcv K+ channel pore.
• Employed a combination of rational and random mutagenesis to optimize channel properties.
• Utilized a yeast-based screening system to identify and select for light-activated K+ conductance.

Main Results:

• Successfully created a synthetic K+ channel responsive to light.
• Developed a method to evolve the channel's light-gating properties.
• Demonstrated a yeast-based screening system for identifying light-activated ion channels.

Conclusions:

• The engineered synthetic light-gated K+ channel offers a novel tool for controlling cellular functions remotely.
• The developed methodology facilitates the evolution of ion channels with desired light-gating characteristics.
• This approach holds potential for in vivo applications in neuroscience and other fields requiring precise cellular control.