By Roberto Kolter, Felipe Moreno (auth.), Richard James, Claude Lazdunski, Franc Pattus (eds.)
Awarded listed below are fresh findings on bacteriocins: plasmid-encoded pollution produced via micro organism, which fluctuate from conventional antibiotics in killing merely micro organism which are heavily concerning the manufacturing pressure. integrated are introductory chapters on bacteriocins, microcins (low molecular weight bacteriocins), and lantibiotics (peptide antibiotics containing lanthionine), extra, contributions on pore forming bacteriocins, the mechanisms of immunity to bacteriocins, uptake and secretion, in addition to evolution of bacteriocins. it's of specific curiosity that the lantibiotic nisin is licensed to be used as meals preservative and one other lantibiotic, epidermin, has strength as a healing drug opposed to pimples.
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Extra resources for Bacteriocins, Microcins and Lantibiotics
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Summary and Perspectives Isn't microcin wonderful? 2 o 8 4 12 hrs Figure 12. Production of mcb RNA and proMccB 17 in the wild-type MccB 17-producing strain. A strain harboring the wild-type plasmid pMccB 17 was grown in minimal glucose medium and allowed to reach stationary phase. Samples were taken at regularinteIVals and: i) RNA was prepared and ii) cells were pulselabeled with 3SS-cysteine and immunoprecipitated with anti-MccB 17 antibodies. On top of the culture's growth CUlVe is displayed a Northern blot where the probe was a DNA fragment harboring mcbA.
E. el.. 2e0 22e 240 260 280 Wevelenlllth(nm) 300 320 340 Figure 3. Ultraviolet absorption spectrum of a proteolytic fragment of MccB 17. The same proteolytic fragment was also analyzed by fluorescence spectroscopy. The fragment exhibited a fluorescence maximum at a wavelength of338 run. The maximum fluorescence was achieved at an excitation wavelength equal to the ultraviolet absorption maximum. These results strongly support the presence of a ring structure chromophore in MccB 17. The fmal structural infonnation we present comes from two-dimensional NMR spectra ofMccB 17.
The action of lactocin 27 against the indicator strain L. helveticus LS 18 was characterized as bacteriostatic even though a two log reduction in colony-forming units per ml occurred after treatment with the highest concentration oflactocin 27. Gross physical damage to the bacterial membrane was not detected, but the bacteriocin did cause a leakage of potassium ions, allowed an influx of sodium ions, and halted protein synthesis. Upreti and Hindsdill (1975) concluded that the targetoflactocin 27 was, therefore, the cytoplasmic membrane.