{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,24]],"date-time":"2025-07-24T11:51:17Z","timestamp":1753357877558},"reference-count":52,"publisher":"Oxford University Press (OUP)","issue":"19","license":[{"start":{"date-parts":[[2019,8,20]],"date-time":"2019-08-20T00:00:00Z","timestamp":1566259200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Hong Kong Health and Medical Research Fund","award":["16150342"],"award-info":[{"award-number":["16150342"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,11,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>When proteostasis is disrupted by stresses such as heat shock, the heat stress response will be stimulated, leading to up-regulation of molecular chaperones by transcriptional activation and mRNA stabilization for restoring proteostasis. Although the mechanisms for their transcriptional activation have been clearly defined, how chaperone mRNAs are stabilized remains largely unknown. Starting by exploring the coupling between the apparently unrelated RNA degradation and protein quality control (PQC) systems, we show that the Dis3 ribonuclease, catalytic subunit of the RNA exosome required for RNA degradation, suppresses PQC activity in unstressed cells by degrading mRNAs encoding the Hsp70 cofactors Sis1, Ydj1\u00a0and Fes1, as well as some other chaperones or PQC factors, thereby limiting their protein expression. Dis3 is stabilized through its binding to Sis1 and the Hsp70s Ssa1\/2. Upon heat stress, loss of Sis1 and Ssa1\/2 availability triggers Dis3 ubiquitination and degradation, leading to stabilization of those chaperone mRNAs originally targeted by Dis3. We further demonstrate that polyQ-expanded huntingtin delays Dis3 degradation during heat stress and thus hinders chaperone mRNA stabilization. Our findings not only reveal a post-transcriptional negative feedback loop for maintaining proteostasis, but also uncover a mechanism that contributes to the impaired heat stress response in Huntington's disease.<\/jats:p>","DOI":"10.1093\/nar\/gkz722","type":"journal-article","created":{"date-parts":[[2019,8,8]],"date-time":"2019-08-08T19:12:54Z","timestamp":1565291574000},"page":"10040-10058","source":"Crossref","is-referenced-by-count":4,"title":["Post-transcriptional negative feedback regulation of proteostasis through the Dis3 ribonuclease and its disruption by polyQ-expanded Huntingtin"],"prefix":"10.1093","volume":"47","author":[{"given":"Ka-Yiu Edwin","family":"Kong","sequence":"first","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ting-Ngai Felix","family":"Hung","sequence":"additional","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pui-Hei Marcus","family":"Man","sequence":"additional","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tin-Ning","family":"Wong","sequence":"additional","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tao","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dong-Yan","family":"Jin","sequence":"additional","affiliation":[{"name":"School of Biomedical Sciences, The University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2019,8,20]]},"reference":[{"key":"2019103013385753900_B1","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1038\/nrm2104","article-title":"The highways and byways of mRNA decay","volume":"8","author":"Garneau","year":"2007","journal-title":"Nat. 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