Enables eukaryotic initiation factor 4E binding activity and translation repressor activity. Involved in several processes, including memory; negative regulation of translational initiation; and social behavior. Acts upstream of or within TOR signaling and insulin receptor signaling pathway. Predicted to be active in cytoplasm. Is expressed in heart; liver; and lung. Used to study autism spectrum disorder. Orthologous to human EIF4EBP2 (eukaryotic translation initiation factor 4E binding protein 2). [provided by Alliance of Genome Resources, Apr 2022]