title: Expression of the mucus adhesion genes Mub and MapA, adhesion-like factor EF-Tu and bacteriocin gene plaA of Lactobacillus plantarum 423, monitored with real-time PCR.
abstract: Expression of the mucus adhesion genes Mub and MapA, adhesion-like factor EF-Tu and bacteriocin gene plaA by Lactobacillus plantarum 423, grown in the presence of bile, pancreatin and at low pH, was studied by real-time PCR. Mub, MapA and EF-Tu were up-regulated in the presence of mucus, proportional to increasing concentrations. Expression of MapA was up-regulated in the presence of 3.0 g/l bile and 3.0 g/l pancreatin at pH 6.5. Similar results were recorded in the presence of 10.0 g/l bile and 10.0 g/l pancreatin at pH 6.5. Expression of Mub was down-regulated in the presence of bile and pancreatin, whilst the expression of EF-Tu and plaA remained unchanged. Expression of Mub and MapA remained unchanged at pH 4.0, whilst expression of EF-Tu and plaA were up-regulated. Expression of MapA was down-regulated in the presence of 1.0 g/l l-cysteine HCl, suggesting that the gene is regulated by transcription attenuation that involves cysteine.
authors.affiliation: Department of Microbiology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa.
authors.forename: K
authors.initials: K
authors.lastname: Ramiah
authors.forename: C A
authors.initials: CA
authors.lastname: van Reenen
authors.forename: L M T
authors.initials: LM
authors.lastname: Dicks
mesh_terms: D001422:Bacterial Adhesion / Q000502:physiology*; D001426:Bacterial Proteins / Q000378:metabolism*; D001646:Bile; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D006863:Hydrogen-Ion Concentration; D048191:Lactiplantibacillus plantarum / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D009093:Mucus / Q000382:microbiology*; D010194:Pancreatin / Q000494:pharmacology; D016133:Polymerase Chain Reaction / Q000379:methods; D019936:Probiotics
chemical_list: D001426:Bacterial Proteins; D010194:Pancreatin