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Título

Detection and Characterization of Streptococcus thermophilus Bacteriophages by Use of the Antireceptor Gene Sequence

AutorBinetti, Ana; Río Lagar, Beatriz del ; Martín, M. Cruz ; Álvarez González, Miguel Ángel
Palabras claveVirus
Bacteria
Micrococcales
Streptococcaceae
Phage
Nucleotide sequence
Streptococcus salivarius subsp. thermophilus
Characterization
Detection
Fecha de publicaciónoct-2005
EditorAmerican Society for Microbiology
CitaciónApplied and Environmental Microbiology 71(10): 6096-6103 (2005)
ResumenIn the dairy industry, the characterization of Streptococcus thermophilus phage types is very important for the selection and use of efficient starter cultures. The aim of this study was to develop a characterization system useful in phage control programs in dairy plants. A comparative study of phages of different origins was initially performed based on their morphology, DNA restriction profiles, DNA homology, structural proteins, packaging mechanisms, and lifestyles and on the presence of a highly conserved DNA fragment of the replication module. However, these traditional criteria were of limited industrial value, mainly because there appeared to be no correlation between these variables and host ranges. We therefore developed a PCR method to amplify VR2, a variable region of the antireceptor gene, which allowed rapid detection of S. thermophilus phages and classification of these phages. This method has a significant advantage over other grouping criteria since our results suggest that there is a correlation between typing profiles and host ranges. This association could be valuable for the dairy industry by allowing a rational starter rotation system to be established and by helping in the selection of more suitable starter culture resistance mechanisms. The method described here is also a useful tool for phage detection, since specific PCR amplification was possible when phage-contaminated milk was used as a template (detection limit, 105 PFU ml–1).
Versión del editorhttp://dx.doi.org/10.1128/AEM.71.10.6096-6103.2005
URIhttp://hdl.handle.net/10261/5693
DOI10.1128/AEM.71.10.6096-6103.2005
ISSN0099-2240
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