2024-03-29T09:58:38Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/35332021-12-27T15:36:21Zcom_10261_68com_10261_2col_10261_321
Bacteriocin Production in Vancomycin-Resistant and Vancomycin-Susceptible Enterococcus Isolates of Different Origins
Campo, Rosa del
Tenorio, Carmen
Jiménez Díaz, Rufino
Rubio, Carmen
Gómez-Lus, Rafael
Baquero, Fernando
Torres, Carmen
Bacteriocin production was determined for 218 Enterococcus isolates (Enterococcus faecalis [93] and E. faecium
[125]) obtained from different origins (human clinical samples [87], human fecal samples [78], sewage [28],
and chicken samples [25]) and showing different vancomycin susceptibility patterns (vancomycin resistant, all
of them vanA positive [56], and vancomycin susceptible [162]). All enterococcal isolates were randomly selected
except for the vancomycin-resistant ones. A total of 33 isolates of eight different bacterial genera were
used as indicators for bacteriocin production. Forty-seven percent of the analyzed enterococcal isolates were
bacteriocin producers (80.6% of E. faecalis and 21.6% of E. faecium isolates). The percentage of bacteriocin
producers was higher among human clinical isolates (63.2%, 81.8% of vancomycin-resistant isolates and 60.5%
of vancomycin-susceptible ones) than among isolates from the other origins (28 to 39.3%). Only one out of the
15 vancomycin-resistant isolates from human fecal samples was a bacteriocin producer, while 44.4% of fecal
vancomycin-susceptible isolates were. The bacteriocin produced by the vanA-containing E. faecium strain RC714,
named bacteriocin RC714, was further characterized. This bacteriocin activity was cotransferred together with
the vanA genetic determinant to E. faecalis strain JH2-2. Bacteriocin RC714 was purified to homogeneity and
its primary structure was determined by amino acid sequencing, showing an identity of 88% and a similarity of
92% with the previously described bacteriocin 31 from E. faecalis YI717. The presence of five different amino acids
in bacteriocin RC714 suggest that this could be a new bacteriocin. The results obtained suggest that the epidemiology
of vancomycin resistance may be influenced by different factors, including bacteriocin production.
R. D. C. was supported by a grant from the Diputación General de
Aragón of Spain (project P49/97) and from the Sociedad Española de
Quimioterapia. This work has been supported in part by a grant from
the Fondo de Investigaciones Sanitarias (00/0545) of Spain.
Peer reviewed
2008-04-11T07:19:18Z
2008-04-11T07:19:18Z
2001-03
artículo
http://purl.org/coar/resource_type/c_6501
Antimicrobial Agents and Chemotherapy 45(3): 905–912 (2001)
1098-6596
http://hdl.handle.net/10261/3533
10.1128/AAC.45.3.905-912.2001
11181378
en
none
320677 bytes
application/pdf
American Society for Microbiology