Guanine nucleotide exchange factor (GEF) for the small GTPase RALA. May be involved in cytoskeletal organization (By similarity). Guanine nucleotide exchange factor for. {ECO:0000250, ECO:0000269|PubMed:10747847, ECO:0000269|PubMed:10889189}. This is the function of Ensembl gene identifier ENSG00000136828 (RALGPS1, Ral GEF with PH domain and SH3 binding motif 1).