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A Technique for Stabilizing Membrane Proteins in Nanodiscs

A Technique for Stabilizing Membrane Proteins in Nanodiscs

Published on: April 30, 2026

Micelles protect membrane complexes from solution to vacuum.

Nelson P Barrera¹, Natalie Di Bartolo, Paula J Booth

¹Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB21EW, UK.

Science (New York, N.Y.)

|June 17, 2008

Summary

This summary is machine-generated.

Mass spectrometry now preserves membrane protein complexes in gas phase. This method reveals subunit stoichiometry and ligand binding for membrane protein studies.

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Area of Science:

Biochemistry
Analytical Chemistry
Structural Biology

Background:

Soluble protein interactions are well-studied using mass spectrometry.
Membrane protein complexes typically dissociate in the gas phase, hindering analysis.

Purpose of the Study:

To develop a mass spectrometry method for analyzing intact membrane protein complexes.
To determine the subunit stoichiometry and ligand-binding properties of membrane proteins.

Main Methods:

Utilized nanoelectrospray ionization mass spectrometry.
Applied the technique to a micellar solution of the adenosine 5'-triphosphate (ATP)-binding cassette transporter BtuC2D2.
Protected the complex within a n-dodecyl-beta-d-maltoside micelle.

Main Results:

Maintained the intact membrane protein complex in the gas phase.
Observed dissociation of transmembrane (BtuC) or cytoplasmic (BtuD) subunits.
Uncovered modifications to transmembrane subunits and cooperative ATP binding.

Conclusions:

Nanoelectrospray mass spectrometry enables direct analysis of membrane protein complexes.
This method allows precise determination of subunit stoichiometry and ligand binding.
Provides a powerful strategy for studying membrane protein complexes.