DNA-dependent protein kinase regulates lysosomal AMP-dependent protein kinase activation and autophagy

Journal article

Puustinen, Pietri, Keldsbo, Anne, Corcelle-Termeau, Elisabeth, Ngoei, Kevin, Sønder, Stine L., Farkas, Thomas, Kaae Andersen, Klaus, Oakhill, Jon S. and Jäättelä, Marja. (2020). DNA-dependent protein kinase regulates lysosomal AMP-dependent protein kinase activation and autophagy. Autophagy. 16(10), pp. 1871-1888. https://doi.org/10.1080/15548627.2019.1710430
AuthorsPuustinen, Pietri, Keldsbo, Anne, Corcelle-Termeau, Elisabeth, Ngoei, Kevin, Sønder, Stine L., Farkas, Thomas, Kaae Andersen, Klaus, Oakhill, Jon S. and Jäättelä, Marja
Abstract

Macroautophagy/autophagy is a central component of the cytoprotective cellular stress response. To enlighten stress-induced autophagy signaling, we screened a human kinome siRNA library for regulators of autophagic flux in MCF7 human breast carcinoma cells and identified the catalytic subunit of DNA-dependent protein kinase PRKDC/DNA-PKcs as a positive regulator of basal and DNA damage-induced autophagy. Analysis of autophagy-regulating signaling cascades placed PRKDC upstream of the AMP-dependent protein kinase (AMPK) complex and ULK1 kinase. In normal culture conditions, PRKDC interacted with the AMPK complex and phosphorylated its nucleotide-sensing γ1 subunit PRKAG1/AMPKγ1 at Ser192 and Thr284, both events being significantly reduced upon the activation of the AMPK complex. Alanine substitutions of PRKDC phosphorylation sites in PRKAG1 reduced AMPK complex activation without affecting its nucleotide sensing capacity. Instead, the disturbance of PRKDC-mediated phosphorylation of PRKAG1 inhibited the lysosomal localization of the AMPK complex and its starvation-induced association with STK11 (serine/threonine kinase 11). Taken together, our data suggest that PRKDC-mediated phosphorylation of PRKAG1 primes AMPK complex to the lysosomal activation by STK11 in cancer cells thereby linking DNA damage response to autophagy and cellular metabolism.

KeywordsAMPK; autophagy; lysosome; metabolism; PRKDC; signaling
Year2020
JournalAutophagy
Journal citation16 (10), pp. 1871-1888
PublisherTaylor & Francis
ISSN1554-8627
Digital Object Identifier (DOI)https://doi.org/10.1080/15548627.2019.1710430
Scopus EID2-s2.0-85078418390
Research or scholarlyResearch
Page range1871-1888
FunderNational Health and Medical Research Council (NHMRC)
Australian Research Council (ARC)
Publisher's version
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All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online26 Jan 2020
Publication process dates
Accepted26 Dec 2019
Deposited14 May 2021
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