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Bioorthogonal protein-DNA conjugation methods for force spectroscopy.

Marie Synakewicz1, Daniela Bauer2, Matthias Rief2

  • 1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, UK. ms2189@cam.ac.uk.

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|September 27, 2019
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Summary

New bioorthogonal methods enable site-specific DNA-protein conjugation for single-molecule force spectroscopy. These techniques overcome limitations of cysteine-based conjugation, expanding mechanical studies to more proteins.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Site-specific DNA-protein conjugation is crucial for single-molecule force spectroscopy.
  • Current maleimide chemistry methods are limited by cysteine availability in many proteins, especially eukaryotes.
  • A need exists for broadly applicable, tag-free conjugation strategies.

Purpose of the Study:

  • To develop novel bioorthogonal approaches for creating DNA-protein conjugates for force spectroscopy.
  • To enable mechanical studies of a wider range of proteins.
  • To expand the toolkit for site-specific bioconjugation.

Main Methods:

  • Introduction of site-specific unnatural amino acids into proteins.
  • Conjugation of DNA oligonucleotides with complementary modifications.
  • Utilizing bioorthogonal reactions: strain-promoted azide-alkyne cycloaddition (SPAAC) and inverse-electron-demand Diels-Alder (IE-DA).
  • Demonstration of SPAAC compatibility with existing peptide-based methods.

Main Results:

  • Successful generation of DNA-protein conjugates using bioorthogonal SPAAC and IE-DA reactions.
  • Demonstrated compatibility of SPAAC with prior peptide conjugation techniques.
  • Established a new, broadly applicable method for DNA-protein conjugation.

Conclusions:

  • Bioorthogonal reactions provide a versatile platform for site-specific DNA-protein conjugation.
  • These methods overcome limitations of traditional cysteine-based approaches.
  • The expanded toolkit facilitates mechanical interrogation of diverse protein systems.