Properties and characteristics of a bacteriocin-like substance produced by Propionibacterium acnes isolated from dental plaque.

A cell-associated bacteriocinlike substance with an approximate molecular weight of 78,000 was isolated from an oral isolate of Propionibacterium acnes. The substance was bacteriostatic and was active against both gram-positive and gram-negative anaerobes. Lysozyme inhibited the activity of the bacteriocinlike substance at low ionic strength.