Specific interactions between the syntrophin PDZ domain and voltage-gated sodium channels

J. Schultz, U. Hoffmuller, G Krause, J. Ashurst, M.J. Macias, P. Schmieder, J. Schneider-Mergener, H. Oschkinat

Nat. Struct. Biol. (1998) 5, 19-24

Syntrophins are modular proteins belonging to the dystrophin associated glycoprotein complex and are thought to be involved in the regulation of the muscular system. Screening of peptide libraries revealed selectivity of the syntrophin PDZ domain toward the motif R/K/Q-E-S/T-X-V-COO- highly conserved in the a-subunit C-terminus of vertebrate voltage gated sodium channels (VGSCs). The solution structure of the domain in complex with the peptide G-V-K-E-S-L-V shows specific interactions between the conserved residues in the peptide and syntrophin-characteristic residues of the domain. The authors propose that syntrophins localize VGSCs to the dystrophin network through its PDZ domain.