Although several methods of
in vitro directed evolution have been developed, they were applied to globular proteins, but not to membrane proteins. Liposome display is a novel method, which enables the directed evolution of membrane protein
in vitro. Membrane protein was synthesized by the cell-free translation system in a cell-sized liposome, and its function was probed by a fluorescence indicator. Liposome with high fluorescence intensity was selected by a cell sorter, enabling the isolation of DNA encoding the evolved protein. Here, we show the application of this method to α-hemolysin, one of the membrane proteins from
Staphylococcus aureus.
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