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. 1971 Aug;22(2):200–204. doi: 10.1128/am.22.2.200-204.1971

Characteristics of a Bacteriocin Derived from Streptococcus faecalis var. zymogenes Antagonistic to Diplococcus peumoniae

Edward Bottone 1,2,3, Jona Allerhand 1,2,3, Michael A Pisano 1,2,3
PMCID: PMC377413  PMID: 4398532

Abstract

A bacteriocin-producing strain of Streptococcus faecalis var. zymogenes (E-1) was isolated from clinical material (conjunctiva). The active substance differed from bacteriocins described by other investigators primarily in its spectrum of antibacterial activity, especially by its marked inhibition of Diplococcus pneumoniae. The E-1 bacteriocin also inhibited nonhemolytic strains of enterococci as well as one-third of the Viridans group of streptococcal strains investigated. The degree of inhibition, however, as indicated by the size of the zones against the latter organisms, was significantly reduced. No activity was detected against any of the strains belonging to the following groups of bacteria: hemolytic enterococci, beta-hemolytic streptococci, nonhemolytic streptococci, staphylococci, and various gram-negative species. Similarly, three strains each of Bacillus cereus and Listeria monocytogenes and one strain of Erysipelothrix insidiosa were not inhibited. The bacteriocin was able to diffuse through bacterial membranes as well as cellulose dialyzer tubing. It was inactivated by heating to 80 C for 20 min but resisted inactivation by either trypsin or chloroform.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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