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Related Concept Videos

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Updated: May 15, 2025

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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Strategies for Acid and Amine Cross-linking and Labeling for Protein Structural Characterization Using Mass

Ashlyn N Dollar1, Ian K Webb1,2

  • 1Department of Chemistry and Chemical Biology, Indiana University Indianapolis, Indianapolis, Indiana 46202, United States.

Analytical Chemistry
|April 10, 2025
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Summary
This summary is machine-generated.

New carbodiimide-based cross-linkers and covalent labels enable probing of both acidic and amine residues in proteins. These tools advance protein structural elucidation, particularly for disordered proteins like alpha synuclein.

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Area of Science:

  • Biochemistry and Structural Biology
  • Chemical Biology
  • Mass Spectrometry

Background:

  • Protein structural elucidation often employs cross-linking and covalent labeling techniques.
  • Limited tools exist for probing electrostatic interactions involving both acidic and amine residues.
  • Understanding these interactions is crucial for protein function and disease mechanisms.

Purpose of the Study:

  • To introduce novel solution-phase cross-linkers and covalent labels targeting amine and acid groups.
  • To utilize carbodiimide chemistry for developing these new chemical biology tools.
  • To demonstrate the utility of these reagents for protein structural characterization.

Main Methods:

  • Development of novel amine-to-acid cross-linkers and single-reagent covalent labels.
  • Application of carbodiimide chemistry for reagent synthesis.
  • Utilized top-down and enzymatic digestion approaches for site determination.
  • Employed mass spectrometry for analysis of cross-linked and labeled proteins.

Main Results:

  • Successfully synthesized and applied novel cross-linkers and covalent labels.
  • Demonstrated proof of concept using ubiquitin with isotopically labeled glycine and glycyl-l-proline.
  • Applied these methods to alpha synuclein, an intrinsically disordered protein relevant to neurological disorders.

Conclusions:

  • The developed carbodiimide-based reagents effectively probe amine and acid residues in proteins.
  • These tools enhance protein structural characterization, especially for intrinsically disordered proteins.
  • Expected to provide insights into the structural tendencies of proteins involved in neurological diseases.