Structural insights into FRS2α PTB domain recognition by neurotrophin receptor TrkB

Proteins. 2014 Jul;82(7):1534-41. doi: 10.1002/prot.24523.


The fibroblast growth factor receptor (FGFR) substrate 2 (FRS2) family proteins function as scaffolding adapters for receptor tyrosine kinases (RTKs). The FRS2α proteins interact with RTKs through the phosphotyrosine-binding (PTB) domain and transfer signals from the activated receptors to downstream effector proteins. Here, we report the nuclear magnetic resonance structure of the FRS2α PTB domain bound to phosphorylated TrkB. The structure reveals that the FRS2α-PTB domain is comprised of two distinct but adjacent pockets for its mutually exclusive interaction with either nonphosphorylated juxtamembrane region of the FGFR, or tyrosine phosphorylated peptides TrkA and TrkB. The new structural insights suggest rational design of selective small molecules through targeting of the two conjunct pockets in the FRS2α PTB domain.

Keywords: FGFR; FRS2; NMR; PTB; RTK; SNT; Trk; neurotrophin receptor; solution structure.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adaptor Proteins, Signal Transducing / chemistry*
  • Adaptor Proteins, Signal Transducing / metabolism*
  • Binding Sites
  • Humans
  • Membrane Glycoproteins / chemistry*
  • Membrane Glycoproteins / metabolism*
  • Membrane Proteins / chemistry*
  • Membrane Proteins / metabolism*
  • Models, Molecular
  • Nuclear Magnetic Resonance, Biomolecular
  • Protein-Tyrosine Kinases / chemistry*
  • Protein-Tyrosine Kinases / metabolism*
  • Receptor, trkB


  • Adaptor Proteins, Signal Transducing
  • FRS2 protein, human
  • Membrane Glycoproteins
  • Membrane Proteins
  • Protein-Tyrosine Kinases
  • Receptor, trkB
  • tropomyosin-related kinase-B, human

Associated data

  • PDB/2MFQ