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In [PSI+] cells, most Sup35 is sequestered into insoluble amyloid aggregates. Despite this depletion, [PSI+] prions typically affect viability only modestly, so [PSI+] must balance sequestering Sup35 into prions with keeping enough Sup35 functional for normal growth. Sis1 is an essential J-protein regulator of Hsp70 required for the propagation of amyloid-based yeast prions. C-terminally truncated Sis1 (Sis1JGF) supports cell growth in place of wild-type Sis1. Sis1JGF also supports [PSI+] propagation, yet [PSI+] is highly toxic to cells expressing only Sis1JGF. We searched extensively for factors that mitigate the toxicity and identified only Sis1, suggesting Sis1 is uniquely needed to protect from [PSI+] toxicity. We find the C-terminal substrate-binding domain of Sis1 has a critical and transferable activity needed for the protection. In [PSI+] cells that express Sis1JGF in place of Sis1, Sup35 was less soluble and formed visibly larger prion aggregates. Exogenous expression of a truncated Sup35 that cannot incorporate into prions relieved [PSI+] toxicity. Together our data suggest that Sis1 has separable roles in propagating Sup35 prions and in moderating Sup35 aggregation that are crucial to the balance needed for the propagation of what otherwise would be lethal [PSI+] prions.<\/jats:p>","DOI":"10.1093\/genetics\/iyab129","type":"journal-article","created":{"date-parts":[[2021,8,7]],"date-time":"2021-08-07T19:01:52Z","timestamp":1628362912000},"source":"Crossref","is-referenced-by-count":12,"title":["Yeast J-protein Sis1 prevents prion toxicity by moderating depletion of prion protein"],"prefix":"10.1093","volume":"219","author":[{"given":"Jyotsna","family":"Kumar","sequence":"first","affiliation":[{"name":"Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0830, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Reidy","sequence":"additional","affiliation":[{"name":"Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0830, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3516-8850","authenticated-orcid":false,"given":"Daniel C","family":"Masison","sequence":"additional","affiliation":[{"name":"Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0830, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2021,8,7]]},"reference":[{"key":"2021120104550213300_iyab129-B1","doi-asserted-by":"crossref","first-page":"2433","DOI":"10.1091\/mbc.e08-01-0078","article-title":"Variant-specific [PSI+] infection is transmitted by Sup35 polymers within [PSI+] aggregates with heterogeneous protein 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