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Enhanced membrane protein expression by engineering increased intracellular membrane production

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Abstract
Background: Membrane protein research is frequently hampered by the low natural abundance of these proteins in cells and typically relies on recombinant gene expression. Different expression systems, like mammalian cells, insect cells, bacteria and yeast are being used, but very few research efforts have been directed towards specific host cell customization for enhanced expression of membrane proteins. Here we show that by increasing the intracellular membrane production by interfering with a key enzymatic step of lipid synthesis, enhanced expression of membrane proteins in yeast is achieved. Results: We engineered the oleotrophic yeast, Yarrowia lipolytica, by deleting the phosphatidic acid phosphatase, PAH1, which led to massive proliferation of endoplasmic reticulum (ER) membranes. For all eight tested representatives of different integral membrane protein families, we obtained enhanced protein accumulation levels and in some cases enhanced proteolytic integrity in the Delta pah1 strain. We analysed the adenosine A2AR G-protein coupled receptor case in more detail and found that concomitant induction of the unfolded protein response in the Delta pah1 strain enhanced the specific ligand binding activity of the receptor. These data indicate an improved quality control mechanism for membrane proteins accumulating in yeast cells with proliferated ER. Conclusions: We conclude that redirecting the metabolic flux of fatty acids away from triacylglycerol-and sterylester-storage towards membrane phospholipid synthesis by PAH1 gene inactivation, provides a valuable approach to enhance eukaryotic membrane protein production. Complementary to this improvement in membrane protein quantity, UPR co-induction further enhances the quality of the membrane protein in terms of its proper folding and biological activity. Importantly, since these pathways are conserved in all eukaryotes, it will be of interest to investigate similar engineering approaches in other cell types of biotechnological interest, such as insect cells and mammalian cells.
Keywords
CRYSTAL-STRUCTURE, RECEPTOR, SACCHAROMYCES-CEREVISIAE, YEAST YARROWIA-LIPOLYTICA, GENE, PURIFICATION, METABOLISM, LIPIDS

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Citation

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MLA
Guerfal, Mouna et al. “Enhanced Membrane Protein Expression by Engineering Increased Intracellular Membrane Production.” MICROBIAL CELL FACTORIES 12 (2013): n. pag. Print.
APA
Guerfal, M., Claes, K., Knittelfelder, O., De Rycke, R., Kohlwein, S. D., & Callewaert, N. (2013). Enhanced membrane protein expression by engineering increased intracellular membrane production. MICROBIAL CELL FACTORIES, 12.
Chicago author-date
Guerfal, Mouna, Katrien Claes, Oskar Knittelfelder, Riet De Rycke, Sepp D Kohlwein, and Nico Callewaert. 2013. “Enhanced Membrane Protein Expression by Engineering Increased Intracellular Membrane Production.” Microbial Cell Factories 12.
Chicago author-date (all authors)
Guerfal, Mouna, Katrien Claes, Oskar Knittelfelder, Riet De Rycke, Sepp D Kohlwein, and Nico Callewaert. 2013. “Enhanced Membrane Protein Expression by Engineering Increased Intracellular Membrane Production.” Microbial Cell Factories 12.
Vancouver
1.
Guerfal M, Claes K, Knittelfelder O, De Rycke R, Kohlwein SD, Callewaert N. Enhanced membrane protein expression by engineering increased intracellular membrane production. MICROBIAL CELL FACTORIES. 2013;12.
IEEE
[1]
M. Guerfal, K. Claes, O. Knittelfelder, R. De Rycke, S. D. Kohlwein, and N. Callewaert, “Enhanced membrane protein expression by engineering increased intracellular membrane production,” MICROBIAL CELL FACTORIES, vol. 12, 2013.
@article{4252147,
  abstract     = {{Background: Membrane protein research is frequently hampered by the low natural abundance of these proteins in cells and typically relies on recombinant gene expression. Different expression systems, like mammalian cells, insect cells, bacteria and yeast are being used, but very few research efforts have been directed towards specific host cell customization for enhanced expression of membrane proteins. Here we show that by increasing the intracellular membrane production by interfering with a key enzymatic step of lipid synthesis, enhanced expression of membrane proteins in yeast is achieved.
Results: We engineered the oleotrophic yeast, Yarrowia lipolytica, by deleting the phosphatidic acid phosphatase, PAH1, which led to massive proliferation of endoplasmic reticulum (ER) membranes. For all eight tested representatives of different integral membrane protein families, we obtained enhanced protein accumulation levels and in some cases enhanced proteolytic integrity in the Delta pah1 strain. We analysed the adenosine A2AR G-protein coupled receptor case in more detail and found that concomitant induction of the unfolded protein response in the Delta pah1 strain enhanced the specific ligand binding activity of the receptor. These data indicate an improved quality control mechanism for membrane proteins accumulating in yeast cells with proliferated ER.
Conclusions: We conclude that redirecting the metabolic flux of fatty acids away from triacylglycerol-and sterylester-storage towards membrane phospholipid synthesis by PAH1 gene inactivation, provides a valuable approach to enhance eukaryotic membrane protein production. Complementary to this improvement in membrane protein quantity, UPR co-induction further enhances the quality of the membrane protein in terms of its proper folding and biological activity. Importantly, since these pathways are conserved in all eukaryotes, it will be of interest to investigate similar engineering approaches in other cell types of biotechnological interest, such as insect cells and mammalian cells.}},
  articleno    = {{122}},
  author       = {{Guerfal, Mouna and Claes, Katrien and Knittelfelder, Oskar and De Rycke, Riet and Kohlwein, Sepp D and Callewaert, Nico}},
  issn         = {{1475-2859}},
  journal      = {{MICROBIAL CELL FACTORIES}},
  keywords     = {{CRYSTAL-STRUCTURE,RECEPTOR,SACCHAROMYCES-CEREVISIAE,YEAST YARROWIA-LIPOLYTICA,GENE,PURIFICATION,METABOLISM,LIPIDS}},
  language     = {{eng}},
  pages        = {{10}},
  title        = {{Enhanced membrane protein expression by engineering increased intracellular membrane production}},
  url          = {{http://dx.doi.org/10.1186/1475-2859-12-122}},
  volume       = {{12}},
  year         = {{2013}},
}

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