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Updated: May 23, 2025

Real Time Measurements of Membrane Protein:Receptor Interactions Using Surface Plasmon Resonance SPR

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Published on: November 29, 2014

The ABC transporter MsbA in a dozen environments.

Lea Hoffmann¹, Anika Baier¹, Lara Jorde¹

¹Osnabrück University, Department of Biology/Chemistry, Structural Biology Section, 49076 Osnabrück, Germany.

Structure (London, England : 1993)

|March 8, 2025

Summary

This summary is machine-generated.

The membrane environment significantly impacts membrane protein structure and function. This study reveals how different lipid mimetics alter the bacterial transporter MsbA

Keywords:

ABC transporter MsbA cryo-EM membrane protein structural biology

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A Step-by-step Method for the Reconstitution of an ABC Transporter into Nanodisc Lipid Particles

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Published on: August 31, 2012

Area of Science:

Structural Biology
Biochemistry
Membrane Protein Research

Background:

High-resolution membrane protein structure determination often relies on artificial membrane mimics.
The choice of membrane substitute can introduce bias, affecting protein activity, stability, and conformation.
The bacterial ATP-binding cassette transporter MsbA exhibits environment-specific behavior.

Purpose of the Study:

To systematically analyze the conformational spectrum of MsbA across diverse membrane environments.
To investigate the feedback between membrane mimetics and transporter conformation.
To provide a framework for understanding environment-induced structural changes in membrane proteins.

Main Methods:

Cryo-electron microscopy (cryo-EM) was used to determine structures.
MsbA was stabilized in over a dozen different membrane mimetics.
Conformational states were analyzed across these varied environments.

Main Results:

Detergents generally favor wide inward-facing conformations of MsbA.
Nanodiscs tend to induce narrower conformations.
Only a few environments allowed MsbA to sample its full conformational range, including narrow and wide states.

Conclusions:

Membrane mimetics exert a pronounced influence on the conformational landscape of MsbA.
The choice of reconstitution environment is critical for accurate structural and functional analysis of membrane proteins.
This study serves as a model for investigating environment-specific biases in other membrane proteins.