ProQ-dependent activation of virulence genes mediated by post-transcriptional control of PhoP synthesis.

Unlabelled: Gastrointestinal disease caused by is associated with the pathogen's ability to replicate within epithelial cells and macrophages. Upon host cell entry, the bacteria express a type-three secretion system encoded within pathogenicity island 2, through which host-manipulating effector proteins are secreted to establish a stable intracellular niche. Transcription of this intracellular virulence program is activated by the PhoPQ two-component system that senses the low pH and the reduced magnesium concentration of host cell vacuoles.

Comamonas aquatilis sp. nov., isolated from a garden pond.

A beige-pigmented bacterial strain, SB30-Chr27-3, isolated from a garden pond, was studied for its taxonomic position. Cells of the isolate were rod-shaped and stained Gram-negative. A comparison of the 16S rRNA gene sequence with the sequences of the type strains of the most closely related species showed that the strain belongs to the genus Comamonas and showed highest sequence similarities to the type strains of Comamonas jiangduensis (97.