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Electron microscopy of methanol-utilizing bacteria.

J S Rokem, J Reichler, I Goldberg

    Antonie Van Leeuwenhoek
    |January 1, 1978
    PubMed
    Summary
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    Methanol-utilizing bacteria differ in cell envelope thickness based on their metabolic pathways. The serine pathway group had thin envelopes, while the ribulose monophosphate pathway group exhibited thicker envelopes and outer membrane protrusions.

    Area of Science:

    • Microbiology
    • Cell Biology
    • Biochemistry

    Background:

    • Methanol utilization is a key metabolic process in various bacteria.
    • Different biochemical pathways exist for methanol assimilation, including the serine pathway and the ribulose monophosphate pathway.
    • Bacterial cell envelope structure is crucial for cell function and interaction with the environment.

    Purpose of the Study:

    • To investigate the ultrastructural differences in cell envelopes of methanol-utilizing bacteria based on their assimilation pathways.
    • To correlate cell envelope morphology with the serine pathway and the ribulose monophosphate pathway of formaldehyde fixation.

    Main Methods:

    • Electron microscopy was employed to examine two distinct groups of methanol-utilizing bacteria.
    • Detailed ultrastructural analysis of the cell envelopes, including the outer membrane, periplasmic area, and cytoplasmic membrane, was performed.

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    Main Results:

    • Bacteria utilizing the serine pathway for methanol assimilation displayed a thin cell envelope.
    • Bacteria employing the ribulose monophosphate pathway exhibited a significantly thicker cell envelope.
    • Specific bacterial strains, such as Pseudomonas C, showed protrusions of the outer membrane in addition to a thicker envelope.

    Conclusions:

    • Bacterial methanol assimilation pathways are associated with distinct cell envelope structures.
    • The ribulose monophosphate pathway is linked to a thicker cell envelope and potential outer membrane modifications.
    • Electron microscopy provides valuable insights into the structural adaptations of bacteria based on their metabolic strategies.