Ras effector protein, which may serve as an inhibitory modulator of neuronal plasticity in aversive memory formation. Can affect Ras signaling at different levels. First, by competing with RAF1 protein for binding to activated Ras. Second, by enhancing signaling from ABL1 and ABL2, which regulate cytoskeletal remodeling. Third, by activating RAB5A, possibly by functioning as a guanine nucleotide exchange factor (GEF) for RAB5A, by exchanging bound GDP for free GTP, and facilitating Ras-activated receptor endocytosis. {ECO:0000269|PubMed:15886098, ECO:0000269|PubMed:9144171, ECO:0000269|PubMed:9208849}. This is the function of RIN1 (Ras and Rab interactor 1, Ensembl gene identifier ENSG00000174791).