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[An efficient mutational method for photosynthetic bacteria].

J Q Lin, M Xiao, M T Long

    Mikrobiologiia
    |January 9, 2007
    PubMed
    Summary
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    This study enhanced mutant isolation in Rhodobacter sphaeroides Y6 using ethyl methanesulfonate and lithium chloride treatments. This combined method significantly increased pigment and auxotrophic mutations, aiding photosynthetic bacteria research.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Biochemistry

    Context:

    • Photosynthetic bacteria like Rhodobacter sphaeroides are crucial for ecological and biotechnological applications.
    • Generating mutants is essential for understanding bacterial genetics and physiology.
    • Traditional mutagenesis methods can be inefficient.

    Purpose:

    • To optimize the isolation of pigment and auxotrophic mutants of Rhodobacter sphaeroides Y6.
    • To evaluate the efficacy of combined ethyl methanesulfonate (EMS) and lithium chloride (LiCl) treatments for mutagenesis.
    • To characterize the biochemical and spectral properties of the obtained mutants.

    Summary:

    • Ethyl methanesulfonate (EMS) followed by lithium chloride (LiCl) treatment was applied to Rhodobacter sphaeroides Y6.

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  • The combined EMS and LiCl treatment yielded a 12% increase in pigment mutations and a 2.5-fold increase in auxotrophic mutations compared to EMS alone.
  • The YM5-3 green mutant exhibited a 10 nm blue shift in carotenoid absorption spectra and neurosporine accumulation, confirmed by HPLC and mass spectrometry.

    • Impact:

    • This optimized mutagenesis method enhances the efficiency of isolating mutants in photosynthetic bacteria.
    • The findings provide a valuable tool for genetic studies and strain improvement of Rhodobacter species.
    • Characterization of the YM5-3 mutant offers insights into carotenoid biosynthesis pathways.