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Chemical characterization, spatial distribution and function of a lipoprotein (murein-lipoprotein) of the E. coli cell wall. The specific effect of trypsin on the membrane structure.
A decrease of the absorbance at 578 nm of a cell wall suspension of mid log phase E. coli occurs when the suspension is incubated with trypsin. The reaction is so rapid that 55% of the total decrease… Expand
Bacterial solutions to the iron-supply problem.
- V. Braun, H. Killmann
- Biology, Medicine
- Trends in biochemical sciences
- 1 March 1999
The insolubility of Fe3+ necessitates special mechanisms for iron acquisition in most organisms. Bacteria use siderophores to chelate Fe3+ and iron in heme, hemoglobin, transferrin and lactoferrin,… Expand
Surface signaling in ferric citrate transport gene induction: interaction of the FecA, FecR, and FecI regulatory proteins.
- S. Enz, S. Mahren, U. H. Stroeher, V. Braun
- Biology, Medicine
- Journal of bacteriology
- 1 February 2000
In Escherichia coli, transcription of the ferric citrate transport genes fecABCDE is controlled by a novel signal transduction mechanism that starts at the cell surface. Binding of ferric citrate to… Expand
Iron uptake mechanisms and their regulation in pathogenic bacteria.
- V. Braun
- Biology, Medicine
- International journal of medical microbiology…
- 2001
In the human body iron is present in growth-limiting amounts for bacteria. For this reason intricate iron transport and iron regulatory systems evolved in bacteria to guarantee a sufficient iron… Expand
Ton-dependent colicins and microcins: modular design and evolution.
Ton-dependent colicins and microcins are actively taken up into sensitive cells at the expense of energy which is provided by the proton motive force of the cytoplasmic membrane. The Ton system… Expand
The structurally related exbB and tolQ genes are interchangeable in conferring tonB-dependent colicin, bacteriophage, and albomycin sensitivity.
- V. Braun
- Medicine, Biology
- Journal of bacteriology
- 1 November 1989
Double exbB tolQ mutants of Escherichia coli were completely resistant to bacteriophages T1 and phi 80, in contrast to strains with exbB or tolQ mutations, which were sensitive. Cells carrying… Expand
Regulation of citrate‐dependent iron transport of Escherichia coli: FecR is required for transcription activation by Feel
- M. Ochs, S. Veitinger, I. Kim, D. Weiz, A. Angerer, V. Braun
- Biology, Medicine
- Molecular microbiology
- 1 January 1995
Citrate‐dependent Fe3+ transport into Escherichia coli K‐12 is induced by iron and citrate. The inducer is probably ferric dicitrate which does not have to be taken up into the cytoplasm to induce… Expand
Energy-coupled transport and signal transduction through the gram-negative outer membrane via TonB-ExbB-ExbD-dependent receptor proteins.
- V. Braun
- Medicine, Biology
- FEMS microbiology reviews
- 1 July 1995
Iron in the form of ferric siderophore complexes and vitamin B12 are transported through the outer membrane of Gram-negative bacteria by a mechanism which consumes energy. There is no known energy… Expand
Iron uptake by Escherichia coli.
- V. Braun
- Biology, Medicine
- Frontiers in bioscience : a journal and virtual…
- 1 September 2003
Ferric iron is transported into Escherichia coli by a number of chelating compounds. Iron transport through the outer membrane by citrate, ferrichrome, enterobactin, aerobactin, yersiniabactin, and… Expand
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