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. 1976 Aug;10(2):299–306. doi: 10.1128/aac.10.2.299

Genetic Basis of Streptococcin A-FF22 Production

J R Tagg a,1, L W Wannamaker a
PMCID: PMC429739  PMID: 984773

Abstract

Spontaneous, low-frequency loss of ability to produce streptococcin A-FF22 (SA) by group A streptococcus strain FF22 was observed. The proportion of non-SA-producing (SA−) derivatives occurring in strain FF22 cultures grown in Todd Hewitt broth supplemented with 1% of yeast extract (THBY) was increased on treatment with ethidium bromide, acriflavin, or rifampin. The highest incidence of SA− organisms, however, was found in untreated THBY cultures that had been aging by incubation at 37°C for several months. The possibility of selective effects in these experiments, operating to enhance the apparent frequency of SA− bacteria, was discounted. The survival of SA− derivatives in association with populations of SA+ bacteria was dependent upon the use of culture conditions inimical to SA activity, since a consistent finding was that the loss of ability to produce SA was associated with loss of immunity to the killing action of this bacteriocin. Whereas selective killing of SA− derivatives was evident in mixed cultures of SA+ and SA− strains in tryptic soy broth, no such effect was demonstrable in THBY. In these experiments, elimination of SA− cells seemed directly related to the presence of active SA. Purified clones of SA− substrains did not seem revertible to SA production, either spontaneously or on treatment with nitrosoguanidine. It is suggested that the property of production of SA by group A streptococcus strain FF22, together with that of host cell immunity to the homologous bacteriocin, may be mediated by plasmid-borne genetic determinants.

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Selected References

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