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Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
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Probing Bioelectronic Connections Using Streptavidin Molecules with Modified Valency.

Bintian Zhang, Eathen Ryan, Xu Wang

    Journal of the American Chemical Society
    |September 9, 2021
    PubMed
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    This study reveals that protein conductance is highly sensitive to contact geometry. Engineered streptavidin tetramers demonstrate that controlling biotin binding sites significantly impacts electronic transport, revealing short-range tunneling.

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    Area of Science:

    • Molecular electronics
    • Biophysics
    • Protein engineering

    Background:

    • Proteins exhibit long electronic decay lengths but high contact resistance, making contact chemistry crucial for bioelectronic devices.
    • Streptavidin's four biotin-binding sites create ambiguity in contact geometry for bioelectronic assemblies.
    • Understanding protein-mediated electronic transport is key for developing novel molecular electronics.

    Purpose of the Study:

    • To investigate the impact of defined contact geometry on protein conductance using engineered streptavidin.
    • To elucidate the mechanism of electronic transport within streptavidin.
    • To explore strategies for enhancing protein conductance in bioelectronic systems.

    Main Methods:

    • Engineering streptavidin tetramers with a controlled ratio of active to "dead" monomers to define biotin binding sites.
    • Utilizing hexaglutamate tails to label active monomers and modulate electronic properties.
    • Measuring the conductance of engineered streptavidin constructs with varying biotin separations.

    Main Results:

    • Protein conductance strongly depends on the separation of biotin molecules, indicating short-range tunneling.
    • Electronic transport within streptavidin is characterized by short-range interactions, unlike longer-range transport in other proteins.
    • The addition of negatively charged hexaglutamate tails significantly enhances conductance.
    • The observed conductance enhancement is quantitatively explained by electronic resonance within the protein.

    Conclusions:

    • Precise control over protein-electrode contact geometry is critical for molecular electronics.
    • Short-range tunneling dominates electronic transport in engineered streptavidin, influenced by biotin placement.
    • Surface charge modification, such as via hexaglutamate tails, can effectively enhance protein conductance through electronic resonance.