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Yorkie Growth-Promoting Activity Is Limited by Atg1-Mediated Phosphorylation. | LitMetric

Yorkie Growth-Promoting Activity Is Limited by Atg1-Mediated Phosphorylation.

Dev Cell

Peter O'Donnell Jr. Brain Institute, Department of Neuroscience, UT Southwestern Medical Center, Dallas, TX 75390-9111, USA; Department of Cell Biology, UT Southwestern Medical Center, Dallas, TX 75390-9111, USA. Electronic address:

Published: March 2020

AI Article Synopsis

Article Abstract

The expression of multiple growth-promoting genes is coordinated by the transcriptional co-activator Yorkie with its major regulatory input provided by the Hippo-Warts kinase cascade. Here, we identify Atg1/ULK1-mediated phosphorylation of Yorkie as an additional inhibitory input independent of the Hippo-Warts pathway. Two serine residues in Yorkie, S74 and S97, are Atg1/ULK1 consensus target sites and are phosphorylated by ULK1 in vitro, thereby preventing its binding to Scalloped. In vivo, gain of function of Atg1, or its activator Acinus, caused elevated Yorkie phosphorylation and inhibited Yorkie's growth-promoting activity. Loss of function of Atg1 or Acinus raised expression of Yorkie target genes and increased tissue size. Unlike Atg1's role in autophagy, Atg1-mediated phosphorylation of Yorkie does not require Atg13. Atg1 is activated by starvation and other cellular stressors and therefore can impose temporary stress-induced constraints on the growth-promoting gene networks under the control of Hippo-Yorkie signaling.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7105283PMC
http://dx.doi.org/10.1016/j.devcel.2020.01.011DOI Listing

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