Dynamic Distribution of ASIC1a Channels and Other Proteins within Cells Detected through Fractionation

Area of Science:

• Cell Biology
• Biochemistry
• Molecular Biology

Background:

• Eukaryotic proteins localize to distinct cellular compartments.
• Understanding intracellular protein distribution and dynamic changes is crucial for biological studies.
• Existing protein fractionation methods can be complex or time-consuming.

Purpose of the Study:

• To develop a simple, rapid, and equipment-efficient method for cell fractionation.
• To enable the identification and quantification of proteins within specific cellular compartments.
• To validate the method for studying dynamic protein translocation.

Main Methods:

• Utilized a tabletop centrifuge and differential detergent treatment for cell fractionation.
• Obtained fractions enriched in cytosolic (Cyt), plasma membrane (PM), membranous organelle (MO), and nuclear (Nu) proteins.
• Validated the protocol using HEK293T cells expressing targeted endogenous and exogenous proteins.

Main Results:

• Successfully fractionated cell compartments, enriching for specific protein types.
• Identified transmembrane and membrane-associated proteins within fractions.
• Quantified the translocation of an ion channel (ASIC1a) and a kinase between cellular compartments upon stimulation.

Conclusions:

• The developed method provides a fast and accessible approach for cell fractionation and protein localization studies.
• This protocol is suitable for identifying various protein types, including transmembrane proteins.
• The method effectively captures dynamic protein trafficking events within cells.