Mitogen-activated protein kinase kinase 1 interacting protein is a small subcellular adaptor protein required for MAPK signaling and ERK1/2 activation. The overall topology of this domain has a central five-stranded beta-sheet sandwiched between a two alpha-helix and a one alpha-helix layer [1].

1: Crystal structure of the p14/MP1 scaffolding complex: how a twin couple attaches mitogen-activated protein kinase signaling to late endosomes. Kurzbauer R, Teis D, de Araujo ME, Maurer-Stroh S, Eisenhaber F, Bourenkov GP, Bartunik HD, Hekman M, Rapp UR, Huber LA, Clausen T; Proc Natl Acad Sci U S A. 2004;101:10984-10989. PMID:15263099