Production, Properties, and Morphology of Bacteriocins fromErwinia chrysanthemi

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Abstract
Sixteen of 18 E. chrysanthemi strains produced bacteriocins. The 18 strains were divided into 5 types according to a scheme devised by using 3 strains as bacteriocin producers. The activity spectra of all but one of the bacteriocinogenic strains was limited to E. chrysanthemi. Bacteriocins from 2 strains were characterized further. These bacteriocins were induced with UV light and mitomycin C, precipitated with (NH4)2SO4, and inactivated at 60-70.degree. C; they were not affected by trypsin, DNase or RNase. Bacteriocins from both strains were composed of a contractile sheath and core. Loose cores and empty contracted sheaths were observed in preparations from both bacteriocins.

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