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Evidence for two chemosensory pathways in Rhodobacter sphaeroides

P A Hamblin1, B A Maguire, R N Grishanin

  • 1Department of Biochemistry, Oxford University, UK.

Molecular Microbiology
|January 13, 1998
PubMed
Summary
This summary is machine-generated.

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Rhodobacter sphaeroides possesses two distinct chemosensory pathways, unlike enteric bacteria. A newly discovered chemotaxis operon, cheA(II), appears to be the dominant pathway for bacterial chemotaxis.

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Chemotaxis Research

Background:

  • Chemotaxis in bacteria is crucial for survival, guiding movement towards attractants.
  • Rhodobacter sphaeroides exhibits unique chemotaxis mechanisms compared to enteric bacteria, involving chemoattractant transport and metabolism.
  • A previously identified chemotaxis operon in R. sphaeroides showed minimal impact on chemotactic behavior upon deletion.

Purpose of the Study:

  • To investigate the genetic basis of chemotaxis in Rhodobacter sphaeroides.
  • To identify novel genes and pathways involved in bacterial chemotaxis.
  • To elucidate the functional roles of identified chemotaxis operons in R. sphaeroides.

Main Methods:

  • Deletion mutagenesis of the known chemotaxis operon.

Related Experiment Videos

  • Tn5 transposon mutagenesis and screening for non-chemotactic mutants.
  • Characterization of gene insertions and functional analysis of a second chemotaxis operon.

    • Main Results:

    • Deletion of the first chemotaxis operon had minor effects on chemotaxis in R. sphaeroides.
    • Identification of a second, previously unknown chemotaxis operon containing cheY, cheA, cheR, cheB, and cheW homologs.
    • Deletion of cheA(II) from the second operon resulted in a non-chemotactic phenotype, indicating its dominant role.

    Conclusions:

    • Rhodobacter sphaeroides possesses two distinct chemosensory pathways, a unique feature among bacteria.
    • The newly identified second chemotaxis operon, particularly cheA(II), represents the dominant pathway for chemotaxis in R. sphaeroides.
    • The previously identified operon plays a minor role under laboratory conditions.