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Related Experiment Videos

Ethane oxidation by methane-oxidizing bacteria.

W Hazeu, J C de Bruyn

    Antonie Van Leeuwenhoek
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Methane-oxidizing bacteria strains show varied ethane oxidation rates. Some strains require co-substrates for high ethane oxidation, while others utilize endogenous respiration or ethanol/acetaldehyde for reductant supply to methane mono-oxygenase (MOO).

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    Applied and environmental microbiology·1990

    Area of Science:

    • Microbiology
    • Biochemistry
    • Environmental Science

    Background:

    • Methane-oxidizing bacteria play a crucial role in the global carbon cycle.
    • Understanding their metabolic pathways is key to comprehending methane mitigation strategies.
    • Variations in substrate oxidation rates among bacterial strains are not fully understood.

    Purpose of the Study:

    • To investigate the relationship between methane and ethane oxidation rates in different bacterial strains.
    • To elucidate the factors influencing ethane oxidation capacity in Methylomonas species.
    • To identify the source of reductants for methane mono-oxygenase (MOO) activity.

    Main Methods:

    • Utilized washed bacterial suspensions of methane-oxidizing bacteria.
    • Compared oxidation rates of methane and ethane across different strains.

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  • Investigated the effect of co-substrates on ethane oxidation.
  • Analyzed enzyme levels in cell-free extracts.
  • Employed chitosan-permeabilized cells to study reductant sources.

    • Main Results:

    • Observed significant differences in ethane oxidation rates among bacterial strains.
    • One Methylomonas strain showed low ethane oxidation, stimulated by co-substrates and formate oxidation.
    • Another Methylomonas strain exhibited high ethane oxidation with negligible co-substrate stimulation.
    • No differences in dissimilative enzyme levels were detected between strains.
    • Permeabilized cells indicated endogenous respiration as the reductant source in low-activity strains, and ethanol/acetaldehyde oxidation in high-activity strains.

    Conclusions:

    • Bacterial strain characteristics significantly influence ethane oxidation capabilities.
    • Reductant sourcing for methane mono-oxygenase (MOO) varies between strains, impacting their metabolic flexibility.
    • These findings contribute to understanding microbial methane metabolism and its environmental implications.