Enables several functions, including 14-3-3 protein binding activity; protein C-terminus binding activity; and transmembrane transporter binding activity. Involved in negative regulation of ion transmembrane transport. Part of protein-containing complex. Is active in synapse. Orthologous to human YWHAQ (tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein theta). [provided by Alliance of Genome Resources, Apr 2022]