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Bacterial growth on 1,2-dichloroethane.

G Stucki, U Krebser, T Leisinger

    Experientia
    |November 15, 1983
    PubMed
    Summary

    Bacterium DE2 utilizes 1,2-dichloroethane as its sole carbon and energy source, exhibiting a specific growth rate of 0.08 h-1. This metabolism involves key enzymes like 2-chloroacetaldehyde dehydrogenase and 2-chloroacetate halidohydrolase.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Environmental Science

    Background:

    • 1,2-Dichloroethane (1,2-DCE) is a widely used industrial solvent and a common environmental pollutant.
    • Microbial degradation of halogenated hydrocarbons is crucial for bioremediation strategies.
    • Understanding the metabolic pathways of microorganisms capable of degrading such compounds is essential.

    Purpose of the Study:

    • To isolate and characterize a bacterium capable of utilizing 1,2-dichloroethane as a sole carbon and energy source.
    • To determine the growth kinetics of the isolated bacterium on 1,2-dichloroethane.
    • To identify key enzymatic activities involved in the degradation pathway.

    Main Methods:

    • Enrichment culture techniques using 1,2-dichloroethane as the sole carbon source.
    • Isolation and identification of the bacterial strain (DE2).
    • Measurement of specific growth rate (µ).
    • Enzymatic assays on cell extracts.

    Main Results:

    • Isolation of a gram-negative, oxidase-positive, motile bacterium, designated strain DE2.
    • Strain DE2 demonstrated growth on 1,2-dichloroethane (5 mM) as the sole carbon and energy source.
    • The specific growth rate (µ) of strain DE2 on 1,2-dichloroethane was determined to be 0.08 h-1.
    • Enzymatic activities detected in cell extracts included NAD-dependent 2-chloroacetaldehyde dehydrogenase and 2-chloroacetate halidohydrolase.

    Conclusions:

    • Bacterium DE2 is capable of aerobic biodegradation of 1,2-dichloroethane.
    • The identified enzymatic activities suggest a potential metabolic pathway for 1,2-dichloroethane degradation.
    • This finding contributes to the understanding of microbial remediation of chlorinated solvents.

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