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Related Experiment Videos

A Myxococcus xanthus cell density-sensing system required for multicellular development

H B Kaplan1, L Plamann

  • 1Department of Microbiology and Molecular Genetics, University of Texas Medical School at Houston 77030, USA.

FEMS Microbiology Letters
|June 1, 1996
PubMed
Summary
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Myxococcus xanthus fruiting body development depends on extracellular A signal, a group of amino acids acting as a cell density cue. Three asg genes (AsgA, AsgB, AsgC) are essential for generating this crucial developmental signal.

Area of Science:

  • Microbiology
  • Developmental Biology
  • Molecular Biology

Background:

  • Myxococcus xanthus multicellular development relies on extracellular signaling.
  • The A signal, a set of amino acids, functions as a cell density sensor during starvation.
  • This signal is critical for initiating fruiting body formation.

Purpose of the Study:

  • To identify and characterize the genes involved in generating the extracellular A signal.
  • To elucidate the molecular mechanisms underlying A signal production and perception.
  • To understand the role of A signal in regulating early developmental gene expression.

Main Methods:

  • Genetic analysis of asg mutants.
  • Biochemical characterization of gene products.

Related Experiment Videos

  • Identification of A signal-dependent genes and regulatory elements.

    • Main Results:

    • Three key genes (asgA, asgB, asgC) required for A signal generation were identified.
    • AsgA is a fused histidine kinase/response regulator, AsgB a putative DNA-binding protein, and AsgC the major sigma factor.
    • Components of the A signaling pathway, including signal transducers, were mapped to the sasB locus.

    Conclusions:

    • The products of asgA, asgB, and asgC are essential for producing the extracellular A signal in Myxococcus xanthus.
    • The A signal pathway involves specific gene products and regulatory elements controlling early developmental genes.
    • Further research will uncover additional components of this complex signaling network for fruiting body development.