A novel assay to monitor predator-prey interactions for Bdellovibrio bacteriovorus 109 J reveals a role for methyl-accepting chemotaxis proteins in predation.
Bdellovibrio bacteriovorus are Gram-negative bacteria that prey upon other Gram-negative bacteria, including some pathogens, in a wide variety of habitats including soil, sewage, marine and estuarine environments. In order to facilitate studies on predation by this organism, we have developed a method that assays killing of luminescent Escherichia coli by B. bacteriovorus. Moreover, we have used this assay to compare predation of cells by derivatives of B. bacteriovorus containing targeted mutations in genes we have identified. Two genes are described; one, mcp2, encoding a methyl-accepting chemotaxis protein (MCP) and the other, an mviN homologue. Bdellovibrio bacteriovorus mcp2::aphII were less efficient predators on luminescent E. coli than B. bacteriovorus containing a randomly inserted aphII gene via TnphoA transposition. These and other chemotaxis experiments implicated at least a minor role for chemotaxis in predation by B. bacteriovorus. They also open the way for further studies on Bdellovibrio ecology, genomics and predator-prey interactions. The results further confirm that Bdellovibrio uses a chemotaxis system in order to sense, and respond to, changes in its environment, including prey.
Lambert
Carey
C
Institute of Genetics, Queens Medical Centre, University of Nottingham, UK.
Smith
Margaret C M
MC
Sockett
R Elizabeth
RE
D001426:Bacterial Proteins; D001501:Bdellovibrio / Q000254:growth & development / Q000502:physiology*; D002633:Chemotaxis / Q000502:physiology*; D004926:Escherichia coli / Q000502:physiology; D008163:Luminescent Measurements; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D000072236:Methyl-Accepting Chemotaxis Proteins
D001426:Bacterial Proteins; D008565:Membrane Proteins; D000072236:Methyl-Accepting Chemotaxis Proteins