Abstract
During prolonged cultivation of S. aureus strains 104 and NCTC 8178 in continuous culture, staphylocoagulase-negative mutants arose and accumulated progressively in increasing proportions. The resulting loss of production of staphylocoagulase was accompanied by a simultaneous loss of production of α-haemolysin and PV-leucocidin. Characterization of the strains revealed no further differences in biotype, exoenzymes, phage pattern and plasmid content.
Cultivation in batch cultures showed that the maximal specific growth rates and specific oxygen-consumption rates of the mutant strains were slightly higher than those of the parent strains, whereas the production of total extracellular protein of the mutant strains had decreased significantly.
From competition experiments between parent and mutant strains in chemostat cultures at different dilution rates and cultivation temperatures, it was concluded that the underlying mechanism of accumulation of staphylocoagulase-negative mutants in the chemostat is based on differences in affinity for the limiting substrate(s) rather than on differences in the production rates of total extracellular proteins. The complete repression of three exoenzymes, a partial repression of the total extracellular protein production, and an increased affinity for the limiting substrate(s) suggested that a mutation in a regulatory gene is involved. The possible role of a transposon in this mutation is discussed.
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Engels, W., Kamps, M.A.F. The nature of the competitive ability of spontaneous staphylocoagulase-negative mutants of Staphylococcus aureus with respect to growth of the parent strains in continuous culture. Antonie van Leeuwenhoek 48, 67–83 (1982). https://doi.org/10.1007/BF00399489
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DOI: https://doi.org/10.1007/BF00399489