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Functional expression of eukaryotic membrane proteins in Lactococcus lactis.
Magnus Monné1, Ka Wai Chan, Dirk-Jan Slotboom
1The Medical Research Council, Dunn Human Nutrition Unit, Hills Road, Wellcome Trust/MRC Building, Cambridge CB2 2XY, UK.
Protein Science : a Publication of the Protein Society
|November 2, 2005
Summary
Overproducing eukaryotic membrane proteins for research is challenging. This study successfully used Lactococcus lactis to overproduce yeast mitochondrial transporters, enabling structural and functional studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Eukaryotic membrane protein overproduction hinders structural and functional analysis.
- High-throughput characterization requires efficient expression systems.
Purpose of the Study:
- To overproduce yeast mitochondrial transport proteins using Lactococcus lactis.
- To optimize expression levels for structural and functional studies.
Main Methods:
- Utilized the nisin-inducible expression system of Lactococcus lactis.
- Expressed 11 yeast mitochondrial transport proteins.
- Modified N-terminal regions and added signal peptides to enhance expression.
Main Results:
- Achieved high-level, functional expression of yeast mitochondrial transporters in the cytoplasmic membrane.
- Identified N-terminal regions as key factors influencing expression levels.
- Improved expression levels >10-fold through protein engineering.
Conclusions:
- The Lactococcus lactis system facilitates high-level eukaryotic membrane protein production.
- Optimized expression levels are suitable for crystallization and structural genomics.
- This system supports high-throughput functional characterization of membrane proteins.