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A new putative sigma factor of Myxococcus xanthus
1Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Piscataway 08854-5635.
Journal of Bacteriology
|June 1, 1993
Summary
Researchers identified a new gene, sigC, in Myxococcus xanthus. This gene appears to negatively regulate the initiation of fruiting body formation during the bacterium's developmental cycle.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Genetics
Background:
- Myxococcus xanthus undergoes a complex developmental cycle involving multicellular fruiting body formation and sporulation.
- Sigma factors are essential components of bacterial RNA polymerase, directing transcription initiation.
- The sigA gene (formerly rpoD) has been previously studied in M. xanthus.
Purpose of the Study:
- To isolate and characterize a novel sigma factor gene, sigC, in Myxococcus xanthus.
- To investigate the role of sigC during the developmental cycle of M. xanthus.
- To elucidate the function of sigC in regulating gene expression related to development.
Main Methods:
- Isolation of sigC using the sigA gene as a probe.
- Determination of the nucleotide sequence of sigC.
- Construction and characterization of a sigC deletion mutant and a sigC-lacZ reporter strain.
Main Results:
- The sigC gene encodes a putative sigma factor with 295 amino acid residues.
- sigC expression is induced early in the developmental cycle and reduced during sporulation.
- A sigC deletion mutant exhibits altered developmental phenotypes, forming fruiting bodies and myxospores under conditions where wild-type cells do not.
Conclusions:
- sigC is a novel sigma factor in Myxococcus xanthus involved in regulating gene expression.
- sigC appears to play a role in negatively controlling the initiation of fruiting body formation.
- Further research is needed to fully understand the regulatory network involving sigC in M. xanthus development.