Functions as a calcium-regulated nucleotide exchange factor activating both Ras and RAC1 through the exchange of bound GDP for GTP. Preferentially activates HRAS in vivo compared to RRAS based on their different types of prenylation. Functions in synaptic plasticity by contributing to the induction of long term potentiation.
Subcellular locations: Cytoplasm, Cell membrane, Endoplasmic reticulum membrane
Translocates to membranes when activated. Found both at cell periphery and along the axon of neurons (By similarity).
Widely expressed with higher expression in brain, followed by heart, lung, pancreas and kidney. Detected in placenta. Expressed in brain and lung (at protein level).