FEATURES

DESCRIPTION

Also known as RBP1_HUMAN, RALBP1, RLIP, RLIP1, RLIP76. Multifunctional protein that functions as a downstream effector of RALA and RALB (PubMed:7673236). As a GTPase-activating protein/GAP can inactivate CDC42 and RAC1 by stimulating their GTPase activity (PubMed:7673236). As part of the Ral signaling pathway, may also regulate ligand-dependent EGF and insulin receptors-mediated endocytosis (PubMed:10910768, PubMed:12775724). During mitosis, may act as a scaffold protein in the phosphorylation of EPSIN/EPN1 by the mitotic kinase cyclin B-CDK1, preventing endocytosis during that phase of the cell cycle (PubMed:12775724). During mitosis, also controls mitochondrial fission as an effector of RALA (PubMed:21822277). Recruited to mitochondrion by RALA, acts as a scaffold to foster the mitotic kinase cyclin B-CDK1-mediated phosphorylation and activation of DNM1L (PubMed:21822277)., Could also function as a primary ATP-dependent active transporter for glutathione conjugates of electrophiles. May also actively catalyze the efflux of a wide range of substrates including xenobiotics like doxorubicin (DOX) contributing to cell multidrug resistance. Interacts with the GTP-bound form of RALA (via effector domain); during mitosis, recruits RALBP1 to the mitochondrion where it promotes DNM1L phosphorylation and mitochondrial fission (PubMed:7673236, PubMed:21822277). Interacts with DNM1L; mediates its mitotic kinase cyclin B-CDK1-mediated phosphorylation during mitosis to promote mitochondrial fission (PubMed:21822277). Interacts with the mitotic kinase cyclin B-CDK1 during mitosis (PubMed:12775724, PubMed:21822277). Interacts with the GTP-bound form of RALB (via effector domain) (PubMed:7673236, PubMed:20696399). Interacts with REPS1; the interaction is direct and does not affect RALA-binding nor GTPase activator activity of RALBP1 (By similarity). Interacts with REPS2; the interaction is direct and does not affect RALA-binding nor GTPase activator activity of RALBP1 (PubMed:9422736). Interacts with EPN1, NUMB and TFAP2A during interphase and mitosis (PubMed:12775724). Interacts with AP2M1; as part of the AP2 complex (PubMed:10910768). Interacts with CDC42 (Probable). Interacts with RAC1 (PubMed:7673236).

EXTERNAL LINKS

RALBP1

RalA-binding protein 1

RALBP1

Molecular Synopsis