Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 464, Issue 4, Pages 1248-1253Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2015.07.114
Keywords
RSC; Chromatin remodeling; Autophagy induction; TORC1; Saccharomyces cerevisMe
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22580086, 19780076]
- Grants-in-Aid for Scientific Research [22580086, 19780076, 15J06634] Funding Source: KAKEN
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The yeast RSC, an ATP-dependent chromatin-remodeling complex, is essential for mitotic and meiotic growth. There are two distinct isoforms of this complex defined by the presence of either Rsc1 or Rsc2; however, the functional differences between these complexes are unclear. Here we show that the RSC complex containing Rsc1, but not Rsc2, functions in autophagy induction. Rsc1 was required not only for full expression of ATG8 mRNA but also for maintenance of Atg8 protein stability. Interestingly, decreased autophagic activity and Atg8 protein stability in rsc1 Delta cells, but not the defect in ATG8 mRNA expression, were partially suppressed by deletion of TOR1. In addition, we found that rsc1 Delta impaired the binding between the Rho GTPase Rho1 and the TORC1-specific component Kog1, which is required for down-regulation of TORC1 activity. These results suggest that the Rsc1-containing RSC complex plays dual roles in the proper induction of autophagy: I) the transcriptional activation of autophagy-related genes independent of the TORC1 pathway and 2) the inactivation of TORC1, possibly through enhancement of Rho1-Kog1 binding. (C) 2015 Elsevier Inc. All rights reserved.
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