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Nandi, N., Tyra, L.K., Stenesen, D., Krämer, H. (2017). Stress-induced Cdk5 activity enhances cytoprotective basal autophagy in Drosophila melanogaster by phosphorylating acinus at serine437.  eLife 6(): e30760.
FlyBase ID
FBrf0237757
Publication Type
Research paper
Abstract

Cdk5 is a post-mitotic kinase with complex roles in maintaining neuronal health. The various mechanisms by which Cdk5 inhibits and promotes neurodegeneration are still poorly understood. Here, we show that in Drosophila melanogaster Cdk5 regulates basal autophagy, a key mechanism suppressing neurodegeneration. In a targeted screen, Cdk5 genetically interacted with Acinus (Acn), a primarily nuclear protein, which promotes starvation-independent, basal autophagy. Loss of Cdk5, or its required cofactor p35, reduces S437-Acn phosphorylation, whereas Cdk5 gain-of-function increases pS437-Acn levels. The phospho-mimetic S437D mutation stabilizes Acn and promotes basal autophagy. In p35 mutants, basal autophagy and lifespan are reduced, but restored to near wild-type levels in the presence of stabilized AcnS437D. Expression of aggregation-prone polyQ-containing proteins or the Amyloid-β42 peptide, but not alpha-Synuclein, enhances Cdk5-dependent phosphorylation of S437-Acn. Our data indicate that Cdk5 is required to maintain the protective role of basal autophagy in the initial responses to a subset of neurodegenerative challenges.

PubMed ID
PubMed Central ID
PMC5760206 (PMC) (EuropePMC)
Related Publication(s)
Note

Cdk5-mediated Acn/Acinus phosphorylation regulates basal autophagy independently of metabolic stress.
Nandi and Krämer, 2018, Autophagy 14(7): 1271--1272 [FBrf0239739]

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    Language of Publication
    English
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    Parent Publication
    Publication Type
    Journal
    Abbreviation
    eLife
    Title
    eLife
    ISBN/ISSN
    2050-084X
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    Aberrations (2)
    Alleles (31)
    Genes (15)
    Human Disease Models (6)
    Physical Interactions (1)
    Natural transposons (1)
    Experimental Tools (2)
    Transgenic Constructs (28)