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PhoX: An IMAC-Enrichable Cross-Linking Reagent.

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Summary

A new chemical cross-linking reagent, PhoX, improves protein structure analysis by enabling efficient enrichment of cross-linked peptides using immobilized metal affinity chromatography (IMAC). This method enhances detection and structural modeling of protein complexes.

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Area of Science:

  • Proteomics
  • Structural Biology
  • Biochemistry

Background:

  • Chemical cross-linking mass spectrometry (CX-MS) is vital for protein structure determination.
  • Substoichiometric reaction efficiencies often hinder the detection of cross-linked peptides.

Purpose of the Study:

  • To develop a novel cross-linking reagent for improved detection of cross-linked peptides.
  • To enhance the enrichment and identification of cross-linked peptides in complex biological samples.

Main Methods:

  • Development of PhoX, a trifunctional cross-linker with a phosphonic acid handle.
  • Utilizing immobilized metal affinity chromatography (IMAC) for enrichment of PhoX-labeled peptides.
  • Application of CX-MS to model proteins and protein complexes, including the LRP1/RAP complex.

Main Results:

  • PhoX enables 300× enrichment efficiency and 97% specificity via IMAC.
  • The method effectively removes linear peptides, allowing application to complex lysates.
  • Identification of 1156 cross-links in a single 3-hour measurement within the 1400 most abundant proteins.

Conclusions:

  • PhoX significantly improves the efficiency and specificity of cross-linked peptide enrichment.
  • This approach facilitates robust protein structural modeling and analysis of protein complexes.
  • PhoX represents a valuable tool for advancing CX-MS applications in proteomics and structural biology.