Organelle membrane derived patches: reshaping classical methods for new targets

Area of Science:

• Cell Biology
• Biophysics
• Molecular Signaling

Background:

• Intracellular ion channels regulate vital cellular processes like motility and fate.
• Intracellular organelles constitute 95% of cellular membrane, highlighting the importance of their ion channels.
• Existing methods lack a unified approach for characterizing intracellular ion channel activity and protein regulation.

Purpose of the Study:

• To present a universal patch clamp approach for studying intracellular ion channels.
• To enable characterization of channel activity in their endogenous protein environment.
• To investigate the regulation of intracellular ion channels by partner proteins.

Main Methods:

• Extraction of intracellular membrane fractions.
• Preparation of patchable substrates from organelle membranes.
• Single-channel electrophysiological recordings and analysis.

Main Results:

• Validated the method by characterizing multiple intracellular ion channels across different organelles.
• Provided detailed electrophysiological data on the regulation of IP3R by Bcl-2.
• Demonstrated the capability to assess ion channels from arbitrary cellular membranes.

Conclusions:

• The developed organelle membrane-derived patch clamp is a universal tool for single-channel assessment.
• This method allows for studying intracellular ion channels in their native context and protein interactions.
• Facilitates a deeper understanding of ion channel function and regulation in cellular signaling.