Identification and initial characterization of glucose-repressible promoters of Streptococcus mutans

Maxine A. Lane, Ken W. Bayles, Ronald E. Yasbin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Three catabolite-repressible promoters from Streptococcus mutans have been isolated. These promoters were identified by utilizing the vector pRQ200 which contains a promoterless amylase-encoding gene, a Gram- origin of replication, and an erythromycin-resistance determinant. A library of S. mutans DNA was constructed in pRQ200, amplified in Escherichia coli and integrated by Campbell-type insertion into the S. mutans chromosome following transformation. Colonies exhibiting amylase production on media lacking an extraneous carbohydrate source were screened for diminished amylase production on media containing glucose. The effect of glucose on these promoters has been characterized using a quantitative spectrophotometric assay of amylase activity.

Original languageEnglish (US)
Pages (from-to)225-229
Number of pages5
Issue numberC
StatePublished - Apr 1991
Externally publishedYes


  • Recombinant DNA
  • catabolite repression
  • dental caries
  • transcriptional fusions

ASJC Scopus subject areas

  • Genetics


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