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Heliobacterium chlorum: cell organization and structure.

K R Miller, J S Jacob, U Smith

    Archives of Microbiology
    |November 1, 1986
    PubMed
    Summary
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    This study reveals the cellular organization of Heliobacterium chlorum, indicating its photosynthetic apparatus resides in the cell membrane. The cell wall exhibits a regular, rectangular subunit structure.

    Area of Science:

    • Microbiology
    • Cell Biology
    • Photosynthesis Research

    Background:

    • Heliobacterium chlorum is a photosynthetic bacterium.
    • Understanding its cellular organization is key to understanding its unique photosynthetic mechanism.

    Purpose of the Study:

    • To elucidate the basic cellular organization of Heliobacterium chlorum.
    • To determine the localization of the photosynthetic apparatus.
    • To characterize the structure of the cell wall.

    Main Methods:

    • Freeze-etching technique for internal cell structure.
    • Negative staining and deep-etching for cell wall visualization.
    • Sonication for cell wall fragment isolation.

    Main Results:

    Related Experiment Videos

    • Internal cell membranes were not observed, suggesting the photosynthetic apparatus is in the cell membrane.
    • The cell membrane's cytoplasmic (PF) face has dense 8 nm particles; the exoplasmic (EF) face has fewer, larger (10 nm) particles.
    • The Heliobacterium chlorum cell wall has a regular rectangular structure with 11 nm spacing.

    Conclusions:

    • The photosynthetic apparatus of Heliobacterium chlorum is located in the cell membrane.
    • The cell membrane displays distinct particle distributions on its fracture faces.
    • The cell wall is a highly ordered, repeating subunit structure.