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Vitamin B12 transport in Escherichia coli: energy coupling between membranes
Abstract
Summary: Cells of Escherichia coli possess high‐affinity active transport systems of vitamin B 12 and iron‐siderophore complexes. Specific outer‐membrane proteins carry out the energy‐dependent transport across the outer membrane, in conjunction with the TonB coupling protein. Mutagenesis experiments have identified a conserved region near the amino‐terminus of the outer‐membrane transporters that is necessary for energy‐coupled transport. The ability of extragenic suppressor mutations in tonB to correct the transport defect indicates that TonB couples the proton‐motive force to the outer‐membrane proteins by direct contact.
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Citations
Cited by
Crystal structure of the outer membrane active transporter FepA from Escherichia coli.
Buchanan (1999) · Nature Structural Biology · doi:10.1038/4931 · Cited by 591
Chemical aspects of siderophore mediated iron transport
Boukhalfa, H., & Crumbliss, A. L. (2002) · Biometals · doi:10.1023/a:1020218608266 · Cited by 547
Transmembrane Signaling across the Ligand-Gated FhuA Receptor
Locher, K. P., Rees, B., Koebnik, R., Mitschler, A., Moulinier, L., Rosenbusch, J. P., & Moras, D. (1998) · Cell · doi:10.1016/s0092-8674(00)81700-6 · Cited by 540
Bacterial solutions to the iron-supply problem
Braun, V., & Killmann, H. (1999) · Trends in Biochemical Sciences · doi:10.1016/s0968-0004(99)01359-6 · Cited by 408
Porins and specific diffusion channels in bacterial outer membranes.
Nikaido, H. (1994) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(17)41716-9 · Cited by 370
Metadata
- Authors
- Kadner, R. J.
- Venue
- Molecular Microbiology
- Publisher
- Wiley
- Published
- 1990-12
- Volume
- 4
- Issue
- 12
- Pages
- 2027-2033
- ISSN
- 0950-382X (ISSN-L)
- 1365-2958
- OpenAlex
- W2157498391
- Cited by
- 219
- References
- 0
- FWCI
- 8.05
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kadner, R. J. (1990). Vitamin B12 transport in Escherichia coli: energy coupling between membranes. Molecular Microbiology. https://doi.org/10.1111/j.1365-2958.1990.tb00562.x
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