Guanine nucleotide exchange factor (GEF) with specificity for RAP2A, it doesn't seems to activate other Ras family proteins (in vitro).
Subcellular locations: Early endosome, Late endosome, Midbody
Localizes to midbody at telophase (By similarity). May shuttle between early and late endosomes. Does not colocalize with lysosomal markers (By similarity).