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PMID:10879525

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Citation

Koronakis, V, Sharff, A, Koronakis, E, Luisi, B and Hughes, C (2000) Crystal structure of the bacterial membrane protein TolC central to multidrug efflux and protein export. Nature 405:914-9

Abstract

Diverse molecules, from small antibacterial drugs to large protein toxins, are exported directly across both cell membranes of gram-negative bacteria. This export is brought about by the reversible interaction of substrate-specific inner-membrane proteins with an outer-membrane protein of the TolC family, thus bypassing the intervening periplasm. Here we report the 2.1-A crystal structure of TolC from Escherichia coli, revealing a distinctive and previously unknown fold. Three TolC protomers assemble to form a continuous, solvent-accessible conduit--a 'channel-tunnel' over 140 A long that spans both the outer membrane and periplasmic space. The periplasmic or proximal end of the tunnel is sealed by sets of coiled helices. We suggest these could be untwisted by an allosteric mechanism, mediated by protein-protein interactions, to open the tunnel. The structure provides an explanation of how the cell cytosol is connected to the external environment during export, and suggests a general mechanism for the action of bacterial efflux pumps.

Links

PubMed Online version:10.1038/35016007

Keywords

Amino Acid Sequence; Bacterial Outer Membrane Proteins/chemistry; Bacterial Outer Membrane Proteins/metabolism; Biological Transport; Cloning, Molecular; Crystallography, X-Ray; Escherichia coli; Escherichia coli Proteins; Membrane Transport Proteins; Models, Molecular; Molecular Sequence Data; Protein Conformation; Protein Structure, Tertiary

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:TOLC

located_in

GO:0030288: outer membrane-bounded periplasmic space

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ECOLI:TOLC

located_in

GO:0045203: integral component of cell outer membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ECOLI:TOLC

enables

GO:0042802: identical protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P02930

F

Seeded From UniProt

complete

Notes

See also

References

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