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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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Identification of Small Molecule-binding Proteins in a Native Cellular Environment by Live-cell Photoaffinity Labeling
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Multivalent photoaffinity probe for labeling small molecule binding proteins.

Gang Li1, Yu Liu, Xuerong Yu

  • 1Key Laboratory of Bioorganic Chemistry and Molecular Engineering of the Ministry of Education, Beijing National Laboratory of Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University , Beijing, China 100871.

Bioconjugate Chemistry
|May 23, 2014
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Researchers improved small molecule (SM)-protein interaction studies by enhancing photoaffinity labeling. Multivalent probes nearly 7-fold increased cross-linking efficiency for better target identification and proteomic profiling.

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Proteomics

Background:

  • Small molecule (SM)-protein interactions are crucial for drug discovery and understanding biological processes.
  • Photo-cross-linking is a key technique for identifying proteins that bind to small molecules.
  • Current DNA-based photoaffinity labeling methods offer specificity but lack efficiency, especially for low-abundance or low-affinity targets.

Purpose of the Study:

  • To enhance the efficiency of small molecule photoaffinity labeling for improved target identification.
  • To overcome the limitations of low cross-linking efficiency in existing DNA-based methods.
  • To develop a more sensitive and broadly applicable method for characterizing SM-protein interactions.

Main Methods:

  • Screening of various cross-linkers to identify optimal candidates.
  • Utilizing the multivalency effect to enhance cross-linking efficiency.
  • Validation of multivalent photoaffinity probes with diverse small molecule-protein pairs in cell lysates.

Main Results:

  • Achieved a nearly 7-fold improvement in cross-linking efficiency.
  • Maintained high probe specificity despite increased efficiency.
  • Demonstrated the broad applicability and performance of multivalent probes across various SM-protein interactions.

Conclusions:

  • Multivalent photoaffinity probes significantly enhance the efficiency of capturing small molecule-binding proteins.
  • This improved method overcomes previous limitations, enabling better detection of low-abundance and low-affinity targets.
  • The developed technique offers a powerful tool for biomedical research, including target identification and proteomic profiling.