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Studying integral membrane protein by SANS using stealth reconstitution systems.

Inokentijs Josts¹, Dominique-Maurice Kehlenbeck², Julius Nitsche³

¹The Hamburg Advanced Research Center for Bioorganic Chemistry (HARBOR), Hamburg, Germany; Department of Chemistry, Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.

Methods in Enzymology

|November 21, 2022

Summary

Researchers developed stealth nanodiscs to study integral membrane proteins (IMPs) like MsbA using small-angle neutron scattering (SANS). This method removes carrier system interference, enabling direct observation of protein structures and conformational changes.

Keywords:

ATP-binding cassette (ABC) transporter Integral membrane protein MsbA Small-angle neutron scattering (SANS)Stealth carrier system

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Area of Science:

Structural Biology
Biophysics
Membrane Protein Research

Background:

Integral membrane proteins (IMPs) require a native lipid environment for stability and activity, complicating structural studies.
Reconstitution into carriers like nanodiscs aids solution-based structural analysis but introduces carrier signal interference in scattering techniques.
Carrier system contributions challenge data analysis in scattering studies of membrane proteins.

Purpose of the Study:

To detail the reconstitution of the ABC transporter MsbA into stealth nanodiscs for structural studies.
To demonstrate the application of small-angle neutron scattering (SANS) with stealth nanodiscs for IMP structural analysis.
To enable direct observation of IMPs by eliminating carrier system scattering contributions.

Main Methods:

Reconstitution of the integral membrane protein MsbA into stealth nanodiscs.
Utilizing small-angle neutron scattering (SANS) with specifically deuterated stealth nanodiscs and solvent contrast variation.
Applying protocols adaptable to other stealth carrier systems like stealth Salipro.

Main Results:

Successful reconstitution of MsbA into stealth nanodiscs.
SANS data analysis revealed the scattering signal of MsbA without interference from the nanodisc carrier system.
Detection of distinct conformational states of the MsbA protein was achieved.

Conclusions:

Stealth nanodiscs provide a powerful tool for structural studies of IMPs using SANS.
This method allows for direct observation of IMPs, overcoming challenges associated with carrier system interference.
The approach facilitates the detection of dynamic conformational changes in membrane proteins.