FlhF(T368A) modulates motility in the bacteriophage carrier state of Campylobacter jejuni

Molecular Microbiology
Lu Liang, Ian F Connerton

Abstract

The carrier state is an alternative bacteriophage life cycle by which virulent bacteriophage can persist in association with host bacteria. Campylobacter jejuni carrier state strains exhibit growth phase dependent motility due to a truncated flagella phenotype. Genome sequencing identified a T368A substitution in the G3 domain of the SRP-like GTPase FlhF from C. jejuni PT14CP30A carrier state strains, which we hypothesized to be the cause of the complex motility phenotype. We have analyzed the role of this mutation in C. jejuni PT14 and demonstrated that flhF(T368A) leads to a large proportion of cells unable to synthesize flagella, while the remaining cells form a single flagellum at one pole leading to significantly reduced motility. The flhF(T368A) mutation causes a reduction in the phage adsorption constant, which leads to a decrease in infection efficiency. Down-regulation of σ28 and σ54 dependent flagellar genes were observed as responses to the flhF(T368A) mutation. FlhF(T368A) protein is impaired in GTPase activity and exhibits reduced stability. C. jejuni carrying flhF(T368A) are less sensitive to bacteriophage infection and formation of the carrier state. The acquisition of flhF(T368A) in carrier state strains acts to...Continue Reading

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Datasets Mentioned

BETA
CP007181.1
CP009043.1
CP008808.1
LMG24379
CP007774.1
LMG24374
CP007772.1
LMG23910
CP007766.1
RM2100

Methods Mentioned

BETA
Illumina sequencing
GTPase
GTPases
PCR
amplicon sequencing
electrophoresis
Assay

Software Mentioned

Clustal Omega
Model
Swiss
PYMOL
CLC Genomics Workbench

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