Format

Send to

Choose Destination
Mol Microbiol. 2000 Aug;37(3):619-28.

Functional analysis of promoters involved in quorum sensing-based regulation of bacteriocin production in Lactobacillus.

Author information

1
Department of Chemistry and Biotechnology, Agricultural University of Norway, N-1432 As, Norway.

Abstract

Bacteriocin production in Lactobacillus sake LTH673 involves at least four operons: a regulatory operon (sppIPKR); two operons encoding bacteriocins and their immunity proteins (sppAiA and orfX); and an operon needed for secretion (sppTE). We show here that the response regulator encoded by sppR in L. sake LTH673, as well as the homologous response regulators encoded by plnC and plnD in Lactobacillus plantarum C11, bind to characteristic repeats found in the -80 to -40 regions of spp operons. The promoters controlling bacteriocin operons are strictly regulated, and their activity is increased more than 1000-fold upon activation. Constitutive expression for the regulatory and transport operons is driven, at least in part, by promoters upstream of the -80 to -40 regions. Peak promoter activity of the regulatory and transporter operons precedes that of the two bacteriocin operons. The results reveal how promoters involved in quorum sensing-based regulation of bacteriocin production in Lactobacillus differ in strength, leakiness and timing of their activity.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center