Ras-related protein Rap-1b (RAP1B)

GTP-binding protein which possesses intrinsic GTPase activity. Contributes to the polarizing activity of KRIT1 and CDH5 in the establishment and maintenance of correct endothelial cell polarity and vascular lumen.

Required for the localization of phosphorylated PRKCZ, PARD3 and TIAM1 into the cell junction. Plays a role in the establishment of basal endothelial barrier function.