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• W1581569433 abstract "The antimicrobial peptide nisin contains the uncommon amino acid residues lanthionine and methyl-lanthionine, which are post-translationally formed from Ser, Thr and Cys residues. To investigate the importance of these uncommon residues for nisin activity, a mutant was designed in which Thr13 was replaced by a Cys residue, which prevents the formation of the thioether bond of ring C. Instead, Cys13 couples with Cys19 via an intramolecular disulfide bridge, a bond that is very unusual in lantibiotics. NMR analysis of this mutant showed a structure very similar to that of wild-type nisin, except for the configuration of ring C. The modification was accompanied by a dramatic reduction in antimicrobial activity to less than 1% of wild-type activity, indicating that the lanthionine of ring C is very important for this activity. The nisin Z mutants S5C and M17C were also isolated and characterized; they are the first lantibiotics known that contain an additional Cys residue that is not involved in bridge formation but is present as a free thiol. Secretion of these peptides by the lactococcal producer cells, as well as their antimicrobial activity, was found to be strongly dependent on a reducing environment. Their ability to permeabilize lipid vesicles was not thiol-dependent. Labeling of M17C nisin Z with iodoacetamide abolished the thiol-dependence of the peptide. These results show that the presence of a reactive Cys residue in nisin has a strong effect on the antimicrobial properties of the peptide, which is probably the result of interaction of these residues with thiol groups on the outside of bacterial cells." @default.
• W1581569433 created "2016-06-24" @default.
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• W1581569433 date "2000-02-01" @default.
• W1581569433 modified "2023-09-29" @default.
• W1581569433 title "Engineering a disulfide bond and free thiols in the lantibiotic nisin Z" @default.
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• W1581569433 doi "https://doi.org/10.1046/j.1432-1327.2000.01075.x" @default.
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