Survey of the Bacteriocines of Enterococci

Abstract

has been made of bacteriocine production by a wide variety of well-characterized strains of group D streptococci. On the basis of spectrums and sensitivity to chloroform, heat, and proteolytic enzymes, five distinct bacteriocines can be

Enterocinogeny and Lysogeny in Enterococci

“…Of the 19 indicators 18 were enterocinogenic, so that enterocine production and sensitivity co-exist in these organisms: 5 of the 19 strains were sensitive to their own enterocine. Similar results were not reported by Kjems (1955), but Brock et al (1963) consider that a strain is always resistant to its own enterocine. Fredericq (1956) takes the same view with regard to colicines and colicinogenic strains, but Ryan, Fried & Mukai (1955) found one strain sensitive to its own colicine.…”

“…Although Pohonek (1961) postulated that bacteriocine-producing enterococci may be able to replace vaginal lactobacilli sensitive to these products, the role of enterocines in the ecology of the organisms remains uncertain. The fact that > 50% of the strains examined by Brock, Peacher & Pierson (1963) produced enterocines leads to the supposition that thcy must play some roIe in the life of bacteria. I n the present work an attempt has been made to determine the frequency of enterocinogeny and lysogeny in enterococci, and the sensitivity of the strains examined to their own inhibitory substances.…”

Enterocin 226NWC, a bacteriocin produced by Enterococcus faecalis 226, active against Listeria monocytogenes

“…Among the studies on bacteriocins produced by Enterococcus spp. (Brock et al 1963;Brandis 1979;Lopez-Lara et al 1991) there are only few reports demonstrating inhibitory activity against L. monocytogenes (Kramer and Brandis 1975;McKay 1990) and only recently, Arihara et al (1991) reported the inhibition of L. monocytogenes by three strains of Ent. faecalis.…”

Transmission of Bacteriocinogenicity by Conjugation in Group D Streptococci

“…This clas sification may not be complete because of the limited number of test strains. Brock et al [5] similarly described five types of bac teriocins produced by hemolytic and nonhemolytic enterococci. Pleceas, et al [12] presented 25 types of group D streptococci by sensitivities against 12 strains of entero cine producer.…”

“…The ability of bacteriocin production was closely related to the presence in the cell of a stable genetic factor composed of deoxyribonucleic acid (DNA) [9,14]. Bacteriocin in group D streptococci was described by Kjem [10] and Brock et al [5]. Brock and Davie [4] stated that both hemolysin and bacteriocin produced by Streptococcus faecalis var.…”