| Modification Notes |
GTPase-activating proteins (GAPs) accelerate the intrinsic rate of GTP hydrolysis of Ras-related proteins, resulting in down regulation of their active form. ARHGAP22 (Rho GTPase activating protein 22), also known as RHOGAP2, is a 698 amino acid protein that localizes to the cytoplasm, and contains one Rho-GAP domain and one PH domain. ARHGAP22 functions as a GTPase-activating protein for Rac 1 converting it to an inactive GDP-bound state and, through its interaction with ZNF161 (VEZF1), is thought to be useful in transcription regulation. Multiple isoforms of ARHGAP22 exist due to alternative splicing events. ARHGAP24, also designated p73RhoGAP, RC-GAP72 or FILGAP is a 748 amino acid Rho GTPase activating protein implicated in cell polarity, cell morphology and cytoskeletal organization.ARHGAP24 exhibits differential expression as isoform 1 is widely expressed with highest levels observed in kidney while isoform 2 is primarily expressed in endothelial cells and has been shown to participate in the modulation of angiogenesis. The N-termini of ARHGAP22 and ARHGAP24 share significant amino acid sequence identity. |