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Membrane proteins reside in lipid bilayers and are typically extracted from this environment for study, which often compromises their integrity. In this work, we ejected intact assemblies from membranes, without chemical disruption, and used mass spectrometry to define their composition. From Escherichia coli outer membranes, we identified a chaperone-porin association and lipid interactions in the β-barrel assembly machinery. We observed efflux pumps bridging inner and outer membranes, and from inner membranes we identified a pentameric pore of TonB, as well as the protein-conducting channel SecYEG in association with F1FO adenosine triphosphate (ATP) synthase. Intact mitochondrial membranes from Bos taurus yielded respiratory complexes and fatty acid-bound dimers of the ADP (adenosine diphosphate)/ATP translocase (ANT-1). These results highlight the importance of native membrane environments for retaining small-molecule binding, subunit interactions, and associated chaperones of the membrane proteome.

Original publication

DOI

10.1126/science.aau0976

Type

Journal article

Journal

Science

Publication Date

16/11/2018

Volume

362

Pages

829 - 834

Keywords

Adenine Nucleotide Translocator 1, Animals, Bacterial Outer Membrane Proteins, Bacterial Proteins, Cattle, Escherichia coli Proteins, Lipid Bilayers, Mass Spectrometry, Membrane Proteins, Mitochondrial Membranes, Mitochondrial Proton-Translocating ATPases, Molecular Chaperones, Porins, Protein Conformation, beta-Strand, Proteome, SEC Translocation Channels