This is the N-terminal Sh3 domain found in myosin X. Myosin X is essential for neuritogenesis, wound healing, cancer metastasis and some pathogenic infections. Myosin X is required for filopodia formation and extension [1].

1: The myosin X motor is optimized for movement on actin bundles. Ropars V, Yang Z, Isabet T, Blanc F, Zhou K, Lin T, Liu X, Hissier P, Samazan F, Amigues B, Yang ED, Park H, Pylypenko O, Cecchini M, Sindelar CV, Sweeney HL, Houdusse A; Nat Commun. 2016;7:12456. PMID:27580874