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Citation
Rosa-Ferreira, C., Sweeney, S.T., Munro, S. (2018). The small G protein Arl8 contributes to lysosomal function and long-range axonal transport in Drosophila.  Biol. Open 7(9): bio035964.
FlyBase ID
FBrf0239971
Publication Type
Research paper
Abstract

The small GTPase Arl8 has emerged as a major regulatory GTPase on lysosomes. Studies in mammalian cells have shown that it regulates both fusion with late endosomes and also lysosomal motility. In its active GTP-bound state, it recruits to lysosomes the HOPS (homotypic fusion and protein sorting) endosomal tethering complex and also proteins that link lysosomes to microtubule motors such as the kinesin adaptor PLEKHM2. To gain further insights into Arl8 biology, we examined the single Drosophila ortholog. Drosophila Arl8 is essential for viability, and mitotic clones of mutant cells are able to continue to divide but show perturbation of the late endocytic pathway. Progeny-lacking Arl8 die as late larvae with movement-paralysis characteristic of defects in neuronal function. This phenotype was rescued by expression of Arl8 in motor neurons. Examination of these neurons in the mutant larvae revealed smaller synapses and axons with elevated levels of carriers containing synaptic components. Affinity chromatography revealed binding of Drosophila Arl8 to the HOPS complex, and to the Drosophila ortholog of RILP, a protein that, in mammals, recruits dynein to late endosomes, with dynein being known to be required for neuronal transport. Thus Drosophila Arl8 controls late endocytic function and transport via at least two distinct effectors.This article has an associated First Person interview with the first author of the paper.

PubMed ID
PubMed Central ID
PMC6176938 (PMC) (EuropePMC)
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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Biol. Open
    Title
    Biology open
    ISBN/ISSN
    2046-6390
    Data From Reference
    Aberrations (1)
    Alleles (8)
    Genes (20)
    Physical Interactions (2)
    Cell Lines (1)
    Natural transposons (1)
    Insertions (2)
    Experimental Tools (2)
    Transgenic Constructs (6)