Mona/Gads SH3C binding to hematopoietic progenitor kinase 1 (HPK1) combines an atypical SH3 binding motif, R/KXXK, with a classical PXXP motif embedded in a polyproline type II (PPII) helix. (Journal of biological chemistry, 2004)

(untitled) - Lewitzky, M; Harkiolaki, M; Domart, M; Jones, E; Feller, S