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Stability-Based Proteomics for Investigation of Structured RNA-Protein Interactions.

Morgan A Bailey1, Justin G Martyr2, Amanda E Hargrove1,2

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|February 11, 2024
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This summary is machine-generated.

This study introduces stability-based mass spectrometry to globally map RNA-protein interactions, overcoming limitations of previous methods. The new approach identifies numerous RNA-binding proteins, including novel candidates, for better understanding RNA function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • RNA-protein interactions are crucial for RNA function but challenging to identify comprehensively.
  • Current methods often require RNA labeling or are biased towards high-affinity interactions, missing weaker, biologically relevant ones.

Purpose of the Study:

  • To adapt stability-based mass spectrometry for global RNA-protein interaction analysis.
  • To identify protein targets of specific RNA structures (MALAT1 triple helix, viral stem loop, PolyU) in nuclear lysate.

Main Methods:

  • Adaptation of stability of proteins from rates of oxidation (SPROX) and thermal protein profiling (TPP) for RNA-protein interaction discovery.
  • Application of SPROX and TPP to LNCaP nuclear lysate with three distinct RNA ligands.

Main Results:

  • Identified 315 protein hits exhibiting RNA-induced conformational and stability changes.
  • Detected proteins were enriched in known RNA-binding proteins and included novel candidates.
  • Demonstrated the orthogonality and complementary utility of SPROX and TPP methods.

Conclusions:

  • Established a novel, generalizable platform for global discovery and interrogation of RNA-protein interactions.
  • This method overcomes limitations of existing techniques, enabling detection of a wider range of interactions.
  • Provides new insights into RNA-protein binding networks for diverse biological contexts.