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Updated: Jun 15, 2026

Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli

Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli

Published on: January 6, 2015

Cell-free expression profiling of E. coli inner membrane proteins.

Daniel Schwarz¹, Daniel Daley, Tobias Beckhaus

¹Center for Biomolecular Magnetic Resonance, Goethe-University of Frankfurt/Main, Frankfurt/Main, Germany.

|March 4, 2010

Summary

Cell-free expression systems efficiently produce bacterial membrane proteins. This study optimized methods, achieving high production rates and validating sample quality for future research.

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Published on: May 23, 2021

Area of Science:

Biochemistry
Molecular Biology
Proteomics

Background:

Cell-free expression systems offer adaptable environments for protein production.
Optimizing expression conditions is crucial for challenging targets like membrane proteins.

Purpose of the Study:

To evaluate cell-free expression strategies for 134 alpha-helical integral membrane proteins from E. coli.
To compare co-translational and post-translational solubilization approaches.

Main Methods:

Utilized cell-free expression reactions with varying conditions.
Employed green fluorescent protein fusions to monitor proteomicelle formation.
Implemented robotic semi-throughput and individual reaction designs.

Main Results:

Verified production for 87% of the target membrane proteins.
Achieved preparative scale synthesis for approximately 50% of targets.
Successfully scaled up expression to milligram quantities and purified flavocytochrome YedZ.

Conclusions:

Cell-free expression is a versatile tool for producing diverse membrane proteins.
Optimized strategies significantly enhance expression efficiency and yield.
Demonstrated the potential for large-scale membrane protein production using cell-free systems.