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Related Experiment Videos

Interactions between fluorescent labeled phosphatidyl serine and cations

W E Harris

    Chemistry and Physics of Lipids
    |July 1, 1977
    PubMed
    Summary

    Calcium ions alter the structure of phosphatidyl serine (PS) membranes. This interaction causes a fluorescent probe to shift, indicating changes in membrane conformation and potential aggregation.

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    Area of Science:

    • Biochemistry
    • Biophysics
    • Membrane Biology

    Background:

    • Phosphatidyl serine (PS) is an acidic phospholipid crucial for cell membrane structure and function.
    • Understanding how divalent cations interact with PS is vital for deciphering membrane dynamics.

    Purpose of the Study:

    • To investigate the effect of calcium (Ca2+) and magnesium (Mg2+) on the conformation and aggregation of phosphatidyl serine (PS) using a fluorescent probe.
    • To determine the location of the fluorescent moiety within the PS micelle and how cation binding affects this localization.

    Main Methods:

    • Synthesis of a fluorescent phospholipid derivative, DNS-PS, by reacting phosphatidyl serine (PS) with dimethylaminoanphthalenesulfonyl (DNS) chloride.
    • Spectroscopic analysis of DNS-PS fluorescence properties (emission maximum, intensity, polarization) in aqueous suspensions with varying dielectric constants and in the presence of Ca2+ and Mg2+.
    • Monitoring of thermal transitions and aggregation behavior of DNS-PS micelles under different ionic conditions.

    Main Results:

    • The DNS moiety of DNS-PS was localized to the glycerol region of the lipid micelle.
    • Addition of Ca2+ induced significant changes in DNS-PS fluorescence, including a blue shift in emission maximum, increased fluorescence intensity and polarization, and aggregation.
    • Mg2+ caused similar but less pronounced effects compared to Ca2+.
    • Ca2+ enabled monitoring of the fatty acid tail thermal transition via fluorescence intensity changes, suggesting a shift of the fluorochrome to the fatty acid tail region.

    Conclusions:

    • Calcium ions induce conformational changes in phosphatidyl serine (PS) structures, leading to aggregation.
    • The binding of Ca2+ to PS membranes alters the local environment of the DNS probe, indicating a structural rearrangement within the lipid bilayer.
    • These findings provide insights into how calcium-mediated interactions with acidic phospholipids can modulate biological membrane conformation.

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