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Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction
05:31

Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction

Published on: May 28, 2012

Properties of phage-receptor lipopolysaccharide from Pseudomonas morsprunorum

A V Quirk, A Sletten, R C Hignett

    Journal of General Microbiology
    |October 1, 1976
    PubMed

    Insights

    This study purified lipopolysaccharide (LPS) from Pseudomonas morsprunorum. The pure LPS showed specific phage inactivation, indicating its role in virulence and potential for phytotoxicity in certain plants.

    Area of Science:

    • Microbiology
    • Plant Pathology
    • Biochemistry

    Background:

    • Pseudomonas morsprunorum is a plant pathogen.
    • Lipopolysaccharides (LPS) are key components of bacterial outer membranes.
    • Understanding LPS function is crucial for plant disease management.

    Purpose of the Study:

    • To extract and purify lipopolysaccharide (LPS) from Pseudomonas morsprunorum.
    • To assess the biological activity and phytotoxicity of the purified LPS.
    • To characterize the chemical composition of the LPS.

    Main Methods:

    • Hot phenol extraction and purification using centrifuging, electrophoresis, and gel filtration.
    • Phage inactivation assays to determine biological activity.
    • Phytotoxicity tests on cherry, bean, and tobacco leaves.
    • Sodium dodecyl sulphate-cellulose acetate electrophoresis for purity assessment.

    Main Results:

    • Purified LPS from a virulent isolate demonstrated specific phage inactivation.
    • LPS from an avirulent mutant did not exhibit phage inactivation.
    • The purified LPS showed no phytotoxicity in cherry leaves but induced mild chlorosis in bean and tobacco at high concentrations.
    • Purity was confirmed by a single band on electrophoresis.

    Conclusions:

    • The purified LPS is biologically active and plays a role in Pseudomonas morsprunorum virulence.
    • The LPS is not significantly phytotoxic at concentrations relevant to natural infection.
    • Further chemical characterization of the LPS is warranted.

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