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Genetic analysis of the AdnA regulon in Pseudomonas fluorescens: nonessential role of flagella in adhesion to sand and biofilm formation.
- Source :
-
Journal of bacteriology [J Bacteriol] 2003 Jan; Vol. 185 (2), pp. 453-60. - Publication Year :
- 2003
-
Abstract
- AdnA is a transcription factor in Pseudomonas fluorescens that affects flagellar synthesis, biofilm formation, and sand adhesion. To identify the AdnA regulon, we used a promoterless Tn5-lacZ element to study the phenotypes of insertion mutants in the presence and absence of AdnA. Of 12,000 insertions, we identified seven different putative open reading frames (ORFs) activated by AdnA (named aba for activated by AdnA). aba120 and aba177 showed homology to flgC and flgI, components of the basal body of the flagella in Pseudomonas aeruginosa. Two other insertions, aba18 and aba51, disrupted genes affecting chemotaxis. The mutant loci aba160 (possibly affecting lipopolysaccharide synthesis) and aba175 (unknown function) led to loss of flagella. The mutant bearing aba203 became motile when complemented with adnA, but the mutated gene showed no similarity to known genes. Curiously, aba18, aba51, aba160, and aba203 mutants formed biofilms even in the absence of AdnA, suppressing the phenotype of the adnA deletion mutant. The combined findings suggest that flagella are nonessential for sand attachment or biofilm formation. Sequence and promoter analyses indicate that AdnA affects at least 23 ORFs either directly or by polar effects. These results support the concept that AdnA regulates cell processes other than those directly related to flagellar synthesis and define a broader cadre of genes in P. fluorescens than that described so far for its homolog, FleQ, in P. aeruginosa.
- Subjects :
- Bacterial Proteins genetics
Bacterial Proteins metabolism
Chemotaxis
DNA Transposable Elements
Flagella ultrastructure
Gene Expression Regulation, Bacterial
Microscopy, Electron
Movement
Mutagenesis, Insertional
Open Reading Frames
Pseudomonas fluorescens genetics
Pseudomonas fluorescens metabolism
Silicon Dioxide
Trans-Activators metabolism
Bacterial Adhesion
Biofilms growth & development
Flagella physiology
Pseudomonas fluorescens physiology
Regulon
Trans-Activators genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9193
- Volume :
- 185
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of bacteriology
- Publication Type :
- Academic Journal
- Accession number :
- 12511490
- Full Text :
- https://doi.org/10.1128/JB.185.2.453-460.2003