Membrane isolation on polylysine-coated beads. Plasma membrane from HeLa cells

Area of Science:

• Cell Biology
• Biochemistry
• Membrane Biology

Background:

• Plasma membrane isolation is crucial for studying cellular functions.
• Conventional methods can be time-consuming and may damage membrane integrity.
• A need exists for efficient and effective membrane purification techniques.

Purpose of the Study:

• To develop a novel, rapid method for purifying HeLa cell plasma membranes.
• To optimize conditions for cell attachment and membrane recovery.
• To assess the purity and integrity of isolated membranes.

Main Methods:

• HeLa cells were attached to polylysine-coated polyacrylamide beads.
• Membrane purification was performed using a sucrose-acetate buffer (pH 5.0) at 25°C.
• Purity was assessed by measuring NaK-adenosine triphosphatase activity, 125I-wheat germ agglutinin binding, and chemical analyses.

Main Results:

• Optimal cell attachment and membrane recovery were achieved under specific buffer conditions.
• Isolated membranes exhibited purity comparable to or greater than conventionally isolated membranes.
• The procedure was rapid, completing in approximately 2.5 hours.

Conclusions:

• This bead-based method provides a fast and efficient way to isolate high-purity HeLa cell plasma membranes.
• The technique yields membranes with fully exposed protoplasmic surfaces.
• This method serves as a valuable supplement to existing membrane isolation techniques.