The clathrin-binding and J-domains of GAK support the uncoating and chaperoning of clathrin by Hsc70 in the brain

Journal of Cell Science
Bum-Chan ParkLois E Greene

Abstract

Cyclin-G-associated kinase (GAK), the ubiquitously expressed J-domain protein, is essential for the chaperoning and uncoating of clathrin that is mediated by Hsc70 (also known as HSPA8). Adjacent to the C-terminal J-domain that binds to Hsc70, GAK has a clathrin-binding domain that is linked to an N-terminal kinase domain through a PTEN-like domain. Knocking out GAK in fibroblasts caused inhibition of clathrin-dependent trafficking, which was rescued by expressing a 62-kDa fragment of GAK, comprising just the clathrin-binding and J-domains. Expressing this fragment as a transgene in mice rescued the lethality and the histological defects caused by knocking out GAK in the liver or in the brain. Furthermore, when both GAK and auxilin (also known as DNAJC6), the neuronal-specific homolog of GAK, were knocked out in the brain, mice expressing the 62-kDa GAK fragment were viable, lived a normal life-span and had no major behavior abnormalities. However, these mice were about half the size of wild-type mice. Therefore, the PTEN-like domains of GAK and auxilin are not essential for Hsc70-dependent chaperoning and uncoating of clathrin, but depending on the tissue, these domains appear to increase the efficiency of these co-chaperones.

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Citations

May 30, 2016·Neurobiology of Aging·Jay P RossZiv Gan-Or
Dec 20, 2018·Molecular Biology of the Cell·Jie LiYanzhuang Wang
Feb 28, 2019·Movement Disorders : Official Journal of the Movement Disorder Society·Matthew J Farrer, Jordan Follett
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Jun 6, 2017·Frontiers in Neuroscience·Erica L Gorenberg, Sreeganga S Chandra
Jun 8, 2021·Frontiers in Integrative Neuroscience·Li ZouZhentao Zhang
Aug 27, 2021·The Biochemical Journal·Katherine M Wood, Corinne J Smith
Sep 5, 2021·Traffic·Shikha T RameshPerunthottathu K Umasankar

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