Bacteriocin from Actinomyces odontolyticus with Temperature-Dependent Killing Properties
AUTOR(ES)
Franker, Colin K.
RESUMO
A strain of Actinomyces odontolyticus, originally isolated from human dental plaque, produced a non-dialyzable, trypsin-sensitive substance that was bactericidal for certain strains of bifidobacteria at 42°C but not at 37°C. Detectable quantities of the bacteriocin were not produced in liquid media. Experimentally useful yields were obtained by extraction from pour plate cultures of producer cells. At 42°C, exponential killing did not occur until indicator cells had doubled at least once. At 37°C, the bacteriocin effected a transient bacteriostasis. Partially purified concentrates were obtained by diethylaminoethyl-cellulose chromatography, and such material was not inactivated by ribonuclease, deoxyribonuclease, or lipase. Pronase, trypsin, and exposure to 100°C for 20 min completely abolished activity. Inhibitory activity was considerably reduced by exposure to a pH of either 3 or 11. Treatment of producer cells with curing agents did not induce a high frequency of non-bacteriocinogenic cells. The odontolyticin was adsorbed by susceptible, as well as resistant, bacteria.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=429927Documentos Relacionados
- Yersinia intermedia: temperature-dependent bacteriocin production.
- Temperature-Dependent Inhibition of Fusion from Without
- Identification of temperature-dependent thermal properties of solid materials
- Membrane Excitability: Made Temperature-Dependent by Mutations
- Temperature-Dependent Properties of Cells Transformed by a Thermosensitive Mutant of Polyoma Virus*
