Atomic model and micelle dynamics of QS-21 saponin

Conrado Pedebos, Laércio Pol-Fachin, Ramon Pons, Cilâine V. Teixeira, Hugo Teixeira

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    11 Citations (Scopus)

    Abstract

    QS-21 is a saponin extracted from Quillaja saponaria, widely investigated as a vaccine immunoadjuvant. However, QS-21 use is mainly limited by its chemical instability, significant variety in molecular composition and low tolerance dose in mammals. Also, this compound tends to form micelles in a concentration-dependent manner. Here, we aimed to characterize its conformation and the process of micelle formation, both experimentally and computationally. Therefore, molecular dynamics (MD) simulations were performed in systems containing different numbers of QS-21 molecules in aqueous solution, in order to evaluate the spontaneous micelle formation. The applied methodology allowed the generation of micelles whose sizes were shown to be in high agreement with small-Angle X-ray scattering (SAXS). Furthermore, the ester linkage between fucose and acyl chain was less solvated in the micellar form, suggesting a reduction in hydrolysis. This is the first atomistic interpretation of previous experimental data, the first micellar characterization of saponin micelles by SAXS and first tridimensional model of a micelle constituted of saponins, contributing to the understanding of the molecular basis of these compounds. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
    Original languageEnglish
    Pages (from-to)3744-3760
    JournalMolecules
    Volume19
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 2014

    Keywords

    • Adjuvant
    • Glycoconjugates
    • Micelle
    • Molecular dynamics
    • QS-21
    • Saponins
    • SAXS

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  • Cite this

    Pedebos, C., Pol-Fachin, L., Pons, R., Teixeira, C. V., & Teixeira, H. (2014). Atomic model and micelle dynamics of QS-21 saponin. Molecules, 19(3), 3744-3760. https://doi.org/10.3390/molecules19033744