Identification of genes associated with mutacin I production in Streptococcus mutans using random insertional mutagenesis

Phoebe Tsang, Justin Merritt, Trang Nguyen, Wenyuan Shi, Fengxia Qi

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Streptococcus mutans is a major pathogen implicated in dental caries. Its virulence is enhanced by its ability to produce bacteriocins, called mutacins, which inhibit the growth of other Gram-positive bacteria. The goal of this study is to use a random insertional mutagenesis approach to search for genes that are associated with mutacin I production in the virulent strain UA140. A random insertional mutagenesis library consisting of 11 000 clones was constructed and screened for a mutacin-defective phenotype. Mutacin-defective clones were isolated, and their insertion sites were determined by PCR amplification or plasmid rescue followed by sequencing. A total of twenty-five unique genes were identified. These genes can be categorized into the following functional classes: two-component sensory systems, stress responses, energy metabolism and central cellular processes. Several conserved hypothetical proteins with unknown functions were also identified. These results suggest that mutacin I production is stringently controlled by diverse and complex regulatory pathways.

Original languageEnglish (US)
Pages (from-to)3947-3955
Number of pages9
JournalMicrobiology
Volume151
Issue number12
DOIs
StatePublished - Dec 1 2005

ASJC Scopus subject areas

  • Microbiology

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