Bacteriocin-like activity of Bacteroides fragilis group isolated from marmosets.
The ability of strains of the B. fragilis group, isolated from the oral cavity and intestine of marmosets, to produce bacteriorin-like substances in solid medium, in terms of auto-, iso- and heteroantagonism, was evaluated. Antagonistic activity was exhibited by 52% of the intestinal strains, 3 of which showed autoantagonistic activity. Three out of 9 oral strains isolated, tested against themselves, showed simultaneous isoantagonism to 4 indicator strains; but not autoantagonism. The same 9 oral strains, when tested against 16 reference strains, revealed interspecific activity only against 2 Gram-positive microorganisms. Higher activity, evaluated by the size of the inhibition halo, was observed in BHI-S agar, and greatest inhibition was obtained after 72 h of incubation.
Farias
L M
LM
Departamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Carvalho
M A
MA
Damasceno
C A
CA
Cisalpino
E O
EO
Vieira
E C
EC
D000818:Animals; D000898:Antibiosis / Q000502:physiology*; D001430:Bacteriocins / Q000096:biosynthesis*; D001442:Bacteroides Infections / Q000382:microbiology*; D001441:Bacteroides fragilis / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D002144:Callithrix / Q000382:microbiology*; D003470:Culture Media; D066298:In Vitro Techniques; D007410:Intestinal Diseases / Q000382:microbiology; D008992:Monkey Diseases / Q000382:microbiology; D009059:Mouth Diseases / Q000382:microbiology
D001430:Bacteriocins; D003470:Culture Media