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Related Experiment Videos

Characterization of lactoferrin interaction with Streptococcus mutans.

M O Lassiter, A L Newsome, L D Sams

    Journal of Dental Research
    |February 1, 1987
    PubMed
    Summary

    Lactoferrin (LF) exhibits bactericidal activity against S. mutans, with anion interactions influencing its effectiveness. Oxygen is crucial for LF

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    Area of Science:

    • Biochemistry
    • Microbiology
    • Immunology

    Background:

    • Lactoferrin (LF) is an iron-binding glycoprotein found in secretions and neutrophils.
    • LF binds ferric ions and anions, with its role in bacterial killing and radical generation debated.
    • S. mutans is a bacterium commonly found in the human mouth.

    Purpose of the Study:

    • To investigate the role of anions in lactoferrin's (LF) bactericidal activity against S. mutans.
    • To explore the mechanism of LF-induced bacterial killing, particularly concerning oxygen and radical generation.

    Main Methods:

    • Assessing the effect of selective anions on LF's bactericidal activity against S. mutans.
    • Investigating LF's bactericidal effect under anaerobic conditions.
    • Examining the influence of thiocyanate, catalase, lactoperoxidase, and bovine serum albumin on LF-mediated bacterial killing.

    Main Results:

    • Specific anions inhibited LF's bactericidal activity, correlating with their ability to coordinate with iron.
    • The LF target site on S. mutans appears to be anionic.
    • LF's bactericidal effect on S. mutans was abrogated under anaerobic conditions and enhanced by oxygen presence.

    Conclusions:

    • Anion binding influences LF's interaction with bacterial surfaces and its bactericidal efficacy.
    • Oxygen is essential for LF's bactericidal mechanism against S. mutans, suggesting a role for oxygen-dependent pathways.
    • The findings support an anionic target site hypothesis and an oxygen-dependent killing mechanism for LF.

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