Investigation of dynamic solution interactions between NET-1 and UNC-5B by multi-wavelength analytical ultracentrifugation

Haben Gabir, Monika Gupta, Markus Meier, Fabian Heide, Manuel Koch, Joerg Stetefeld, Borries Demeler

Research output: Contribution to journalArticlepeer-review

Abstract

NET-1 is a key chemotropic ligand that signals commissural axon migration and change in direction. NET-1 and its receptor UNC-5B switch axon growth cones from attraction to repulsion. The biophysical properties of the NET-1 + UNC-5B complex have been poorly characterized. Using multi-wavelength-AUC by adding a fluorophore to UNC-5B, we were able to separate the UNC-5B sedimentation from NET-1. Using both multi-wavelength- and single-wavelength AUC, we investigated NET-1 and UNC-5B hydrodynamic parameters and complex formation. The sedimentation velocity experiments show that NET-1 exists in a monomer–dimer equilibrium. A close study of the association shows that NET-1 forms a pH-sensitive dimer that interacts in an anti-parallel orientation. UNC-5B can form equimolar NET-1 + UNC-5B heterocomplexes with both monomeric and dimeric NET-1.

Original languageEnglish
Pages (from-to)473-481
Number of pages9
JournalEuropean Biophysics Journal
Volume52
Issue number4-5
DOIs
StatePublished - Jul 2023

Keywords

  • Axon guidance
  • Hetero-interaction studies between proteins
  • Hydrodynamic bead modeling
  • Multi-wavelength analytical ultracentrifugation
  • Netrin-1
  • UltraScan
  • UltraScan-SOMO
  • Uncoordinated-5

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