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Concentrating membrane proteins using asymmetric traps and AC electric fields.

Matthew R Cheetham¹, Jonathan P Bramble, Duncan G G McMillan

¹School of Physics & Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.

Journal of the American Chemical Society

|April 12, 2011

Summary

Researchers developed a new method using patterned lipid bilayers and electric fields to concentrate and trap charged membrane proteins within their native environment. This technique significantly increases protein concentration, aiding in their study and structure-function determination.

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Area of Science:

Biochemistry
Cell Biology
Biophysics

Background:

Membrane proteins are crucial for cellular functions, including transport and signaling.
30% of human genes encode membrane proteins, and many drugs target them.
Studying membrane proteins is challenging due to difficulties in purification and handling.

Purpose of the Study:

To develop a method for manipulating membrane components within their native environment.
To enable efficient concentration and trapping of charged membrane proteins.
To facilitate structure-function relationship studies of membrane proteins.

Main Methods:

Utilized asymmetrically patterned supported lipid bilayers.
Applied AC electric fields for manipulation of charged components.
Employed a "nested trap" design for concentration and trapping.

Main Results:

Achieved efficient manipulation and trapping of charged membrane components.
Demonstrated an approximately 30-fold increase in average protein concentration.
Showcased that trapped components remain for hours due to restricted diffusion.

Conclusions:

The developed method effectively concentrates and traps charged membrane components in situ.
This approach offers a powerful tool for the manipulation and study of membrane proteins.
Anticipated widespread application in membrane protein research and drug discovery.