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The Lipid Bilayer Modulates the Structure and Function of an ATP-binding Cassette Exporter.

J Biol Chem. 2016 Feb 26;291(9):4453-61. Epub 2016 Jan 02
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摘要


ATP-binding cassette exporters use the energy of ATP hydrolysis to transport substrates across membranes by switching between inward- and outward-facing conformations. Essentially all structural studies of these proteins have been performed with the proteins in detergent micelles, locked in specific conformations and/or at low temperature. Here, we used luminescence resonance energy transfer spectroscopy to study the prototypical ATP-binding cassette exporter MsbA reconstituted in nanodiscs at 37 °C while it performs ATP hydrolysis. We found major differences when comparing MsbA in these native-like conditions with double electron-electron resonance data and the crystal structure of MsbA in the open inward-facing conformation. The most striking differences include a significantly smaller separation between the nucleotide-binding domains and a larger fraction of molecules with associated nucleotide-binding domains in the nucleotide-free apo state. These studies stress the importance of studying membrane proteins in an environment that approaches physiological conditions.

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