Into the Membrane and Beyond
Improving Membrane Protein Over-Expression in Escherichia coli
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Membrane proteins fulfil a wide variety of essential functions in the cell and many are (potential) drug targets. Since their natural abundance is usually very low, most membrane proteins have to be over-expressed for functional and structural studies. Unfortunately, over-expression of membrane proteins in E. coli is usually toxic. I have studied the effects of the expression of membrane proteins, including the human KDEL receptor, on BL21(DE3) and its derivatives. Saturation of the Sec translocon, a cytoplasmic membrane associated protein conducting channel that mediates the insertion/ biogen...
Membrane proteins fulfil a wide variety of essential functions in the cell and many are (potential) drug targets. Since their natural abundance is usually very low, most membrane proteins have to be over-expressed for functional and structural studies. Unfortunately, over-expression of membrane proteins in E. coli is usually toxic. I have studied the effects of the expression of membrane proteins, including the human KDEL receptor, on BL21(DE3) and its derivatives. Saturation of the Sec translocon, a cytoplasmic membrane associated protein conducting channel that mediates the insertion/ biogenesis of membrane proteins, appeared to be the prime reason for the toxicity of membrane protein over-expression. The obtained data have resulted in many leads and ideas to further improve membrane protein over-expression yields in E. coli, e.g. we have engineered a plasmid (pLemo) that helps avoiding saturation of the Sec translocon upon membrane protein over-expression in E. coli.
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