A new V-ATPase regulatory mechanism mediated by the rab interacting lysosomal protein (RILP)

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Abstract

Progressive luminal acidification of intracellular compartments is important for their functions. Proton transport into the organelle's lumen is mediated by vacuolar ATPases (V-ATPases) large multi-subunit proton pumps organized into 2 domains, V0 and V1, working together as a rotary machine. The interaction of each subunit with specific partners plays a crucial role in controlling V-ATPase activity. Recently, we have shown that RILP, a Rab7 effector regulating late endocytic traffic and biogenesis of multivesicular bodies (MVBs), is a specific interactor of the V-ATPase subunit V1G1, a fundamental component of the peripheral stalk for correct V-ATPase assembly. RILP controls V1G1 stability and localization affecting V-ATPase assembly and function at the level of endosomes and lysosomes. The discovery of this new regulatory mechanism for V-ATPase opens new scenario to the comprehension of organelle's pH regulation and reveals a key role of RILP in controlling different aspects of endosome to lysosome transport.

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De Luca, M., & Bucci, C. (2014). A new V-ATPase regulatory mechanism mediated by the rab interacting lysosomal protein (RILP). Communicative and Integrative Biology. Landes Bioscience. https://doi.org/10.4161/cib.29616

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