{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T10:08:15Z","timestamp":1784282895913,"version":"3.55.0"},"reference-count":42,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2018,7,11]],"date-time":"2018-07-11T00:00:00Z","timestamp":1531267200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["SCHA750\/19"],"award-info":[{"award-number":["SCHA750\/19"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["SCHA750\/20-2"],"award-info":[{"award-number":["SCHA750\/20-2"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["KL2937\/1-2"],"award-info":[{"award-number":["KL2937\/1-2"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004586","name":"Funda\u00e7\u00e3o Carlos Chagas Filho de Amparo \u00e0 Pesquisa do Estado do Rio de Janeiro","doi-asserted-by":"publisher","award":["to MML"],"award-info":[{"award-number":["to MML"]}],"id":[{"id":"10.13039\/501100004586","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Funda\u00e7\u00e3o de Amparo a Pesquisa do Rio de Janeiro (FAPERJ-Cientistas do Nosso Estado)","award":["to MML"],"award-info":[{"award-number":["to MML"]}]},{"name":"CAPES-PNPD","award":["to BLB"],"award-info":[{"award-number":["to BLB"]}]},{"name":"PhosMOrg of UNiversity of Kassel","award":["to RS"],"award-info":[{"award-number":["to RS"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>The protein phosphatase Sit4 has been shown to be required for lipogenesis and resistance against the acetyl-CoA carboxylase inhibitor soraphen A. Since Sit4 is also required for biosynthesis of Elongator dependent tRNA modifications such as 5-methoxycarbonylmethyluridine (mcm5U), we investigated the relevance of tRNA modifications in lipogenesis and soraphen A response. While sit4 and Elongator (elp3) mutants copy defects in mcm5U formation and stress sensitivity, they do not share soraphen A sensitivity and low lipid droplet (LD) phenotypes. In contrast to sit4, we found elp3 mutants to display partial soraphen A resistance and a high LD phenotype. Screening a collection of tRNA modification mutants additionally identified the tRNA pseudo-uridine synthase gene DEG1 to be required for soraphen A sensitivity. Since deg1 and elp3 share high LD and soraphen A resistance phenotypes, these are likely caused by translational defects. In support of this notion, we observe overexpression of tRNAGlnUUG suppresses lipolysis defects of deg1 mutants. Hence, the sit4 mutation results in a composite defect including tRNA modification deficiency and loss of Snf1 kinase dephosphorylation, which induce opposite effects on LD regulation. Importantly, however, the Snf1 kinase regulatory defects of the phosphatase mutant dominate over effects on LD regulation imposed by loss of the tRNA modification alone.<\/jats:p>","DOI":"10.3390\/biom8030049","type":"journal-article","created":{"date-parts":[[2018,7,11]],"date-time":"2018-07-11T10:50:09Z","timestamp":1531306209000},"page":"49","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Protein Phosphatase Sit4 Affects Lipid Droplet Synthesis and Soraphen A Resistance Independent of Its Role in Regulating Elongator Dependent tRNA Modification"],"prefix":"10.3390","volume":"8","author":[{"given":"Bruno Leonardo","family":"Bozaquel-Morais","sequence":"first","affiliation":[{"name":"Instituto de Bioqu\u00edmica M\u00e9dica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonie","family":"Vogt","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Biologie, Fachgebiet Mikrobiologie, Universit\u00e4t Kassel, 34132 Kassel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"D\u2019Angelo","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Biologie, Fachgebiet Mikrobiologie, Universit\u00e4t Kassel, 34132 Kassel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9484-5247","authenticated-orcid":false,"given":"Raffael","family":"Schaffrath","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Biologie, Fachgebiet Mikrobiologie, Universit\u00e4t Kassel, 34132 Kassel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0809-0050","authenticated-orcid":false,"given":"Roland","family":"Klassen","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Biologie, Fachgebiet Mikrobiologie, Universit\u00e4t Kassel, 34132 Kassel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0449-7563","authenticated-orcid":false,"given":"M\u00f3nica","family":"Montero-Lomel\u00ed","sequence":"additional","affiliation":[{"name":"Instituto de Bioqu\u00edmica M\u00e9dica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2018,7,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10946","DOI":"10.1016\/S0021-9258(18)82077-4","article-title":"Acetyl-CoA carboxylase from yeast is an essential enzyme and is regulated by factors that control phospholipid metabolism","volume":"268","author":"Hasslacher","year":"1993","journal-title":"J. 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