Ras effector protein that functions as a guanine nucleotide exchange (GEF) for RAB5B and RAB31, by exchanging bound GDP for free GTP. Required for normal RAB31 function.
Subcellular locations: Cytoplasm, Cytoplasmic vesicle, Early endosome
Activation of tyrosine phosphorylation signaling induces translocation to cytoplasmic vesicles.
Widely expressed.