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Related Experiment Videos

[Ricin structure: the study by the fluorescence quenching method].

T L Bushueva, A G Tonevitskiĭ, E A Burshteĭn

    Molekuliarnaia Biologiia
    |May 1, 1990
    PubMed
    Summary

    Ricin toxin undergoes pH-dependent structural changes, particularly in its B-chain, affecting tryptophan residue accessibility. Acidic conditions induce conformational shifts, impacting ricin

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Toxicology

    Context:

    • Ricin toxin, a potent plant-derived cytotoxin, is composed of N-glycosidase A (RTA) and B-cell-binding (RTB) subunits.
    • Understanding ricin's conformational dynamics is crucial for developing effective antitoxins and therapeutics.
    • Tryptophan residues are sensitive probes for monitoring protein structure and microenvironment changes.

    Purpose:

    • To investigate the pH-induced conformational transformations of ricin and its subunits.
    • To characterize the accessibility of tryptophan residues to quenchers at different pH values.
    • To elucidate the role of pH in ricin's structural integrity and functional properties.

    Summary:

    • Fluorescence spectroscopy was employed to study ricin and its isolated subunits at pH 4.0, 5.0, and 7.4.
    • A novel method classified tryptophan residues into three classes based on accessibility to ionic and organic quenchers.
    • Ricin's B-chain structure loosens below pH 5, with at least one tryptophan residue undergoing conformational change in acidic conditions.

    Impact:

    • Reveals distinct classes of tryptophan residues within ricin, offering insights into its structural organization.
    • Demonstrates significant pH-dependent alterations in ricin's conformation, particularly affecting the B-chain.
    • Provides a foundation for understanding ricin's interaction with biological membranes and potential therapeutic interventions.

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