GTP-binding protein that 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 to the cell junction. Heterodimer with RAP1GAP. Interacts with EPAC2, SGSM1, SGSM2 and SGSM3. Activated by binding to the GTPase-activating protein RAP1GAP. Activated by guanine nucleotide-exchange factor (GEF) EPAC2 in a cAMP-dependent manner. Belongs to the small GTPase superfamily. Ras family. Note: This description may include information from UniProtKB.
Protein type: G protein; G protein, monomeric, Ras; G protein, monomeric
Alt. Names/Synonyms: DKFZp586H0723; GTP-binding protein smg p21B; K-REV; RAL1B; RAP1B; RAP1B, member of RAS oncogene family; Ras family small GTP binding protein RAP1B; Ras-related protein Rap-1b; RAS-related protein RAP1B
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.