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General protein-protein cross-linking.

Alice Alegria-Schaffer1

  • 1Thermo Fisher Scientific, Rockford, IL, USA.

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|March 4, 2014
PubMed
Summary

This protocol details protein cross-linking using bis[sulfosuccinimidyl] suberate (BS(3)), a water-soluble reagent. BS(3) efficiently forms stable amide bonds with primary amines, enabling protein-protein interaction studies.

Keywords:
Amount of BS(3)Hydrolysis of NHS esterMoisture condensationPhosphate-buffered saline (PBS)Protein cross-linking

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Chemistry

Background:

  • Protein-protein interactions are crucial for cellular functions.
  • Cross-linking is a key technique for studying these interactions.
  • Bis[sulfosuccinimidyl] suberate (BS(3)) is a commonly used homobifunctional cross-linker.

Purpose of the Study:

  • To describe a generalizable protocol for protein-to-protein cross-linking.
  • To highlight the utility of BS(3) as a water-soluble amine-reactive cross-linker.
  • To provide a foundation for adapting the protocol with similar cross-linking agents.

Main Methods:

  • Utilizing the homobifunctional cross-linker BS(3) which contains two sulfo-NHS ester groups.
  • Reacting BS(3) with primary amines on proteins under slightly alkaline conditions (pH 7.2-8.5).
  • Formation of stable amide bonds between cross-linked proteins.

Main Results:

  • Successful protein-to-protein cross-linking achieved using BS(3).
  • Demonstration of the reaction mechanism involving sulfo-NHS esters and primary amines.
  • Generation of stable amide bonds, indicating successful cross-linking.

Conclusions:

  • The described protocol provides a robust method for protein cross-linking.
  • BS(3) is an effective reagent for studying protein-protein interactions.
  • The protocol is adaptable for various cross-linking applications in biochemical research.