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The Multifaceted Benefits of Protein Co-expression in Escherichia coli

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Published on: February 5, 2015

A versatile selection system for folding competent proteins using genetic complementation in a eukaryotic host.

Christina Lyngsø¹, Søren Kjaerulff, Sven Müller

¹The Laboratory for Molecular Cardiology, The Danish National Research Foundation Centre for Cardiac Arrhythmia, Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen N, Denmark. lyngsoe@sund.ku.dk

Protein Science : a Publication of the Protein Society

|January 19, 2010

Summary

This summary is machine-generated.

This study introduces a novel eukaryotic in vivo selection system for identifying properly folded proteins. The system uses a yeast growth marker to efficiently screen protein libraries, enabling discovery of functional protein variants.

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Area of Science:

Biochemistry
Molecular Biology
Protein Engineering

Background:

Recombinant protein expression is crucial for research and industry but often hindered by improper protein folding.
Eukaryotic protein folding relies on complex quality-control systems within the endoplasmic reticulum (ER).

Purpose of the Study:

To develop a robust and widely applicable eukaryotic in vivo system for selecting correctly folded proteins.
To identify functional protein variants from complex libraries using a novel screening approach.

Main Methods:

A genetic complementation system in Schizosaccharomyces pombe was established, fusing a protein library to the invertase growth marker gene.
The system leverages the ER protein quality-control machinery to retain misfolded proteins and allow secretion of properly folded ones.
Autotrophic colony growth served as a selectable phenotype, directly correlating with protein folding competence.

Main Results:

The system successfully identified folding-competent mutant proteins from a complex insertion mutant library of Tumor Necrosis Factor-alpha (TNF-alpha).
Demonstrated the broad applicability and stringency of the in vivo selection system for diverse protein folding studies.

Conclusions:

The developed eukaryotic in vivo selection system provides an efficient method for identifying properly folded proteins.
This approach facilitates structural and functional studies, as well as the production of therapeutic and industrial proteins.