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An extracellular material elaborated by Micrococcus sodonensis

J N CAMPBELL, J B EVANS, J J PERRY

    Journal of Bacteriology
    |December 1, 1961
    PubMed

    Insights

    Micrococcus sodonensis elaborates an extracellular material rich in deoxyribonucleic acid (DNA). This production is dependent on specific growth conditions and linked to intracellular DNA concentration.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Biochemistry

    Background:

    • Certain bacterial species produce extracellular substances that can influence their environment and interactions.
    • Understanding the composition and production of these materials is crucial for elucidating bacterial physiology and potential applications.

    Purpose of the Study:

    • To characterize the extracellular material produced by Micrococcus sodonensis.
    • To investigate the conditions influencing the production of this material.
    • To compare the deoxyribonucleic acid (DNA) composition of extracellular and intracellular DNA.

    Main Methods:

    • Culturing Micrococcus sodonensis in specific yeast extract-tryptone broth.
    • Analyzing the biochemical composition of the extracellular material (DNA, RNA, protein, pigment).
    • Manipulating growth conditions and cell suspension to observe effects on material production and intracellular DNA levels.
    • Comparing base composition and ratios of extracellular and intracellular DNA.

    Main Results:

    • Micrococcus sodonensis actively growing in yeast extract-tryptone broth produced significant amounts of extracellular material, primarily deoxyribonucleic acid (DNA) (approx. 80%).
    • Extracellular material production was specific to this medium and ceased upon removal of cells or suspension in distilled water.
    • Cells producing extracellular material showed increased intracellular DNA, while others showed a decline; yeast extract or purines increased intracellular DNA but not extracellular release.
    • Extracellular and intracellular DNA exhibited similar or identical base compositions, consistent with the Watson-Crick structure.

    Conclusions:

    • The extracellular material produced by Micrococcus sodonensis is predominantly DNA, with its synthesis and release being tightly regulated by growth conditions.
    • Intracellular DNA concentration appears to be a key factor influencing the elaboration of this extracellular DNA.
    • The findings suggest a specific physiological role or mechanism for DNA release in Micrococcus sodonensis under optimal growth conditions.
    Keywords:
    MICROCOCCUS/chemistry

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