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Molecular genetics of methane oxidation

J C Murrell1

  • 1Department of Biological Sciences, University of Warwick, Coventry, UK.

Biodegradation
|December 1, 1994
PubMed
Summary

Methanotrophs oxidize methane using methane monooxygenase enzymes. Gene clusters for these enzymes show homology, and their expression is regulated by copper levels, enabling detection in environmental samples.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Methanotrophs are bacteria that use methane as their sole carbon and energy source.
  • Methane oxidation is catalyzed by methane monooxygenase (MMO) enzymes.
  • Soluble MMO (sMMO) complexes from Methylococcus capsulatus and Methylosinus trichosporium are well-studied.

Purpose of the Study:

  • To investigate the genetic organization and regulation of soluble methane monooxygenase (sMMO) genes.
  • To characterize the functional expression of sMMO genes and develop mutant strains.
  • To utilize sMMO probes for environmental detection of methanotrophs.

Main Methods:

  • DNA sequencing of sMMO gene clusters.
  • Gene expression analysis under varying copper-to-biomass ratios.
  • Heterologous expression of mmoB and mmoC genes in E. coli.
  • Construction of sMMO mutants using marker-exchange mutagenesis.
  • Development and application of sMMO probes for DNA and organism detection.

Main Results:

  • sMMO gene clusters in M. capsulatus and M. trichosporium exhibit significant homology.
  • sMMO gene expression is repressed at high copper-to-biomass ratios.
  • Transcriptional regulation involves an RpoN-like promoter upstream of the mmoX gene.
  • Heterologously expressed mmoB and mmoC proteins are functionally active.
  • Marker-exchange mutagenesis yields more stable sMMO mutants compared to previous methods.
  • sMMO probes successfully detect specific DNA and methanotrophs in environmental samples.

Conclusions:

  • The genetic organization and regulation of sMMO genes are conserved in studied methanotrophs.
  • Copper availability is a key factor controlling sMMO gene expression.
  • Engineered sMMO systems and probes offer valuable tools for microbial research and environmental monitoring.

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