RalA-binding protein 1 (RLIP76) (RLIP76)

RLIP76 (RalA-binding protein 1) is a multifunctional 76 kDa protein that serves as a critical node in cellular signaling, endocytosis, and detoxification [3, 6, 7]. It acts as a downstream effector for Ral GTPases and a GTPase-activating protein (GAP) for Rho family members like Cdc42 and Rac1, thereby linking Ras and Rho signaling pathways [1, 10, 13]. Beyond signaling, RLIP76 is a unique ATP-dependent, non-ABC transporter responsible for the efflux of glutathione-electrophile conjugates (GS-E) and various chemotherapeutic drugs, such as doxorubicin and vincristine [6, 8, 15]. It is frequently overexpressed in various malignancies, including lung, colon, and prostate cancers, where it promotes cell survival and mediates multidrug resistance by preventing the accumulation of pro-apoptotic metabolites like 4-hydroxynonenal [3, 6, 8]. Conversely, its depletion has been linked to mitochondrial dysfunction and synaptic damage in neurodegenerative conditions like Alzheimer's disease [7, 14, 16]. Therapeutic strategies currently focus on inhibiting RLIP76 using antibodies or antisense oligonucleotides to sensitize cancer cells to chemotherapy and radiation [6, 8].

Other names

RALBP1RIP1RLIP1Dinitrophenyl S-Glutathione ATPase76 kDa Ral-interacting proteinRal-interacting protein 1

RLIP76 functions as an ATP-dependent efflux pump for xenobiotics and glutathione-electrophile conjugates, contributing to multidrug resistance; it also acts as a GTPase-activating protein for Rho family GTPases and a scaffold for endocytic and mitotic complexes.