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Rewiring protein binding specificity in paralogous DRG/DFRP complexes.

Christian A E Westrip1, Stephen J Smerdon1, Mathew L Coleman1

  • 1Institute of Cancer and Genomics Sciences, University of Birmingham, B15 2TT Birmingham, UK.

Structure (London, England : 1993)
|September 14, 2024
PubMed
Summary
This summary is machine-generated.

Developmentally regulated GTP-binding (DRG) proteins DRG1 and DRG2 bind specific partners, DFRP1 and DFRP2. Structural analysis revealed key residues controlling this specificity, with few mutations switching DRG1 binding preference.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Eukaryotes possess two related GTP-binding proteins, DRG1 and DRG2.
  • These proteins interact with specific partners, DFRP1 and DFRP2, respectively.
  • DFRPs are crucial for DRG function and bind via a conserved domain.

Purpose of the Study:

  • To elucidate the structural basis of binding specificity between DRG1/DRG2 and DFRP1/DFRP2.
  • To identify specific amino acid residues at the interaction interface that dictate binding preference.

Main Methods:

  • Utilized AlphaFold to generate structural models of human DRG/DFRP complexes.
  • Performed biochemical characterization of DRG/DFRP interactions.
  • Analyzed interface residues to determine their role in specificity.

Main Results:

  • Identified specific interface residues responsible for DRG/DFRP binding specificity.
  • Demonstrated that as few as five mutations in DRG1 can alter its binding preference from DFRP1 to DFRP2.
  • Showed that DFRP1 binding enhances DRG1 stability and GTPase activity, while DFRP2 binding primarily increases stability.

Conclusions:

  • The study provides novel insights into the structural determinants governing DRG/DFRP binding specificity.
  • Understanding these interactions is key to deciphering the functional roles of DRG proteins.
  • This work lays the foundation for further investigations into DRG-mediated cellular processes.