Affiliation:
1. Weill Institute for Cell and Molecular Biology and Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853
2. Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37212
Abstract
The protein composition of the plasma membrane is rapidly remodeled in response to changes in nutrient availability or cellular stress. This occurs, in part, through the selective ubiquitylation and endocytosis of plasma membrane proteins, which in the yeast Saccharomyces cerevisiae is mediated by the HECT E3 ubiquitin ligase Rsp5 and arrestin-related trafficking (ART) adaptors. Here, we provide evidence that the ART protein family members are composed of an arrestin fold with interspersed disordered loops. Using Art1 as a model, we show that these loop and tail regions, while not strictly required for function, regulate its activity through two separate mechanisms. Disruption of one loop mediates Art1 substrate specificity. Other loops are subjected to phosphorylation in a manner dependent on the Pho85 cyclins Clg1 and Pho80. Phosphorylation of the loops controls Art1’s localization to the plasma membrane, which promotes cargo ubiquitylation and endocytosis, demonstrating a mechanism through which Art1 activity is regulated.
Publisher
American Society for Cell Biology (ASCB)
Subject
Cell Biology,Molecular Biology
Cited by
15 articles.
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