{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T06:16:36Z","timestamp":1779344196935,"version":"3.51.4"},"reference-count":49,"publisher":"American Society for Cell Biology (ASCB)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["MBoC"],"published-print":{"date-parts":[[1997,12]]},"abstract":"<jats:p>In the fission yeast Schizosaccharomyces pombe, p34<jats:sup>cdc2<\/jats:sup>plays a central role controlling the cell cycle. We recently isolated a new gene named srw1<jats:sup>+<\/jats:sup>, capable of encoding a WD repeat protein, as a multicopy suppressor of hyperactivated p34<jats:sup>cdc2<\/jats:sup>. Cells lackingsrw1<jats:sup>+<\/jats:sup>are sterile and defective in cell cycle controls. When starved for nitrogen source, they fail to effectively arrest in G<jats:sub>1<\/jats:sub>and die of accelerated mitotic catastrophe if regulation of p34<jats:sup>cdc2<\/jats:sup>\/Cdc13 by inhibitory tyrosine phosphorylation is compromised by partial inactivation of Wee1 kinase. Fertility is restored to the disruptant by deletion of Cig2 B-type cyclin or slight inactivation of p34<jats:sup>cdc2<\/jats:sup>.srw1<jats:sup>+<\/jats:sup>shares functional similarity withrum1<jats:sup>+<\/jats:sup>, having abilities to induce endoreplication and restore fertility to rum1disruptants. In the srw1 disruptant, Cdc13 fails to be degraded when cells are starved for nitrogen. We conclude that Srw1 controls differentiation and cell cycling at least by negatively regulating Cig2- and Cdc13-associated p34<jats:sup>cdc2<\/jats:sup>and that one of its roles is to down-regulate the level of the mitotic cyclin particularly in nitrogen-poor environments.<\/jats:p>","DOI":"10.1091\/mbc.8.12.2475","type":"journal-article","created":{"date-parts":[[2013,7,2]],"date-time":"2013-07-02T23:12:27Z","timestamp":1372806747000},"page":"2475-2486","source":"Crossref","is-referenced-by-count":83,"title":["A WD Repeat Protein Controls the Cell Cycle and Differentiation by Negatively Regulating Cdc2\/B-Type Cyclin Complexes"],"prefix":"10.1091","volume":"8","author":[{"given":"Satoko","family":"Yamaguchi","sequence":"first","affiliation":[{"name":"Department of Biochemistry, Faculty of Medicine, The University of Tokyo, Hongo, Tokyo 113, Japan; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroshi","family":"Murakami","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Faculty of Medicine, The University of Tokyo, Hongo, Tokyo 113, Japan; and"},{"name":"Cell Cycle Laboratory, Imperial Cancer Research Fund, Lincoln\u2019s Inn Fields, London WC2A 3PX, England"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroto","family":"Okayama","sequence":"additional","affiliation":[{"name":"Department of Biochemistry, Faculty of Medicine, The University of Tokyo, Hongo, Tokyo 113, Japan; and"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1076","reference":[{"key":"B1","doi-asserted-by":"crossref","first-page":"1343","DOI":"10.1002\/j.1460-2075.1992.tb05179.x","volume":"11","author":"Al-Khodairy F.","year":"1992","journal-title":"EMBO J."},{"key":"B2","doi-asserted-by":"crossref","first-page":"2028","DOI":"10.1128\/MCB.15.4.2028","volume":"15","author":"Basi G.","year":"1995","journal-title":"Mol. 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