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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Related Experiment Video

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Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes
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Oligonucleotide-Blocked Streptavidin for Biotinylation Analysis.

Steven K Taylor, Natasa Kostic, Milan N Stojanovic

    Bioconjugate Chemistry
    |August 25, 2022
    PubMed
    Summary

    Researchers developed a monovalent streptavidin method to precisely analyze biotinylation distribution in proteins. This technique reveals individual biotinylation levels, complementing existing methods that only show the average.

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    In Vitro Biochemical Assays using Biotin Labels to Study Protein-Nucleic Acid Interactions
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    In Vitro Biochemical Assays using Biotin Labels to Study Protein-Nucleic Acid Interactions

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Biotechnology

    Background:

    • The streptavidin-biotin interaction is crucial in biomedical research.
    • Controlling biotinylation is essential for protein function and experimental design.
    • Current methods for analyzing biotinylation often provide only average values, lacking detailed distribution information.

    Purpose of the Study:

    • To develop a precise method for analyzing the distribution of biotinylation on proteins.
    • To overcome limitations of existing analytical techniques for biotinylation characterization.

    Main Methods:

    • Utilized an oligonucleotide-blocked streptavidin, termed 'monovalent streptavidin'.
    • Applied this reagent to individually tag biotin moieties on proteins.
    • Employed a polyacrylamide gel shift assay to visualize and determine the distribution of biotinylation.

    Main Results:

    • Successfully demonstrated that monovalent streptavidin can selectively tag individual biotin molecules.
    • The polyacrylamide gel shift assay revealed the distribution of biotinylation, showing products with n=1, 2, 3, etc. biotin molecules.
    • This method provides a detailed product distribution, contrasting with the mean values from current commercial reagents.

    Conclusions:

    • Monovalent streptavidin offers a novel approach for detailed biotinylation analysis.
    • This technique complements existing methods by providing product distribution rather than just the mean.
    • Accurate biotinylation analysis is vital for optimizing protein labeling in various applications.