C-terminal lipid-binding START domain of mammalian STARD12 and related proteins, which also have an N-terminal Rho GTPase-activating protein (RhoGAP) domain
This subgroup includes the steroidogenic acute regulatory protein (StAR)-related lipid transfer (START) domains of STARD12 (also known as DLC-1, Arhgap7, and p122-RhoGAP) and related proteins. It belongs to the START domain family, and in turn to the SRPBCC (START/RHO_alpha_C/PITP/Bet_v1/CoxG/CalC) domain superfamily of proteins that bind hydrophobic ligands. SRPBCC domains have a deep hydrophobic ligand-binding pocket. Proteins belonging to this subgroup also have an N-terminal SAM (sterile alpha motif) domain and a RhoGAP domain, and have a SAM-RhoGAP-START domain organization. The precise function of the START domain in this subgroup is unclear.