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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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A Fluorescence Fluctuation Spectroscopy Assay of Protein-Protein Interactions at Cell-Cell Contacts
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Fluorescence plate reader for quantum dot-protein bioconjugation analysis.

Kilmara H G Carvalho, Aluizio G Brasil, Paulo E Cabral Filho

    Journal of Nanoscience and Nanotechnology
    |April 17, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fluorescence plate reader method to assess protein bioconjugation efficiency with quantum dots (QDs). The technique accurately evaluates binding, crucial for successful fluorescent bioconjugate applications.

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    Area of Science:

    • Bioconjugation Chemistry
    • Nanotechnology
    • Analytical Chemistry

    Background:

    • Protein-quantum dot (QD) bioconjugates are vital in various applications.
    • Assessing the efficiency of QD-protein conjugation is critical for reliable results.
    • Existing methods for evaluating bioconjugation efficiency can be complex or indirect.

    Purpose of the Study:

    • To develop and validate a new method for evaluating protein bioconjugation efficiency onto quantum dots (QDs).
    • To utilize the native fluorescence of QDs for semi-quantitative analysis of bioconjugation.
    • To offer a simpler, more accurate alternative to existing methods for assessing bioconjugation quality.

    Main Methods:

    • Utilized a Fluorescence Plate Reader to measure the native fluorescence of quantum dots (QDs).
    • Tested the method on carboxyl-coated Cadmium Telluride (CdTe) QDs conjugated with bovine serum albumin, concanavalin A lectin, and anti-A antibody.
    • Employed two conjugation strategies: covalent binding and adsorption processes.
    • Corroborated results using flow cytometry and fluorescence spectroscopy.

    Main Results:

    • The Fluorescence Plate Reader assay accurately assessed protein bioconjugation efficiency for both covalent and adsorption methods.
    • Results obtained from the plate reader method were consistent with those from flow cytometry and fluorescence spectroscopy.
    • The method demonstrated sensitivity in distinguishing between different bioconjugation efficiencies.

    Conclusions:

    • A novel, efficient, and accurate method using a Fluorescence Plate Reader for assessing protein-QD bioconjugation has been established.
    • This technique offers a semi-quantitative and simultaneous analysis of multiple samples.
    • The method's reliance on native QD fluorescence provides a sensitive and direct measure of bioconjugation quality, crucial for successful applications.