Prophase pathway‐dependent removal of cohesin from human chromosomes requires opening of the Smc3–Scc1 gate DNA does not leave cohesin through the Scc1–Smc1.

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Prophase pathway‐dependent removal of cohesin from human chromosomes requires opening of the Smc3–Scc1 gate DNA does not leave cohesin through the Scc1–Smc1 gate. (A) A stable transgenic Hek293 cell line that inducibly expresses a covalent Scc1–Smc1 fusion. The siRNA‐resistant expression of the Scc1–Smc1 fusion protein with respect to the endogenous Smc1 that persists after 2 days of RNAi is shown. (B) Covalent fusion of Scc1 and Smc1 is compatible with chromatin association. Insoluble chromatin (C) and soluble supernatant (SN) fractions of the Scc1–Smc1 expressing cell line were analysed by Smc1‐ and α‐tubulin‐westerns and by Coomassie Brilliant Blue (CBB) staining of chromatin bound histones. (C, D) The Scc1–Smc1 fusion protein interacts with endogenous cohesin subunits and Wapl. The transgenic Hek293 line was largely treated as described in Figure 3A (only without addition of rapamycin). The respective mitotic cell lysate (Input) was cleared by high‐speed centrifugation to remove chromatin and subjected to immunoprecipitations (IPs) with anti‐Smc3 (C) or anti‐Wapl (D). Co‐purifying proteins were detected by western analysis using the indicated antibodies. Mock‐IPs using unspecific rabbit IgG served as controls. (E, F) A covalent Scc1–Smc1 fusion does not impair release of cohesin from prophase chromosomes. Scc1–Smc1 expressing cells were treated largely as described in Figure 4A (only without addition of rapamycin) and then analysed by IF (E) and chromosome spreading (F). (E) Averaged over two independent experiments, 99.5% of a total of 200 Hoechst 33342, anti‐Hec1, and anti‐Smc1 stained cells did not exhibit any signs of Smc1–chromatin association beyond prophase. (F) Averaged over three independent experiments, 94.7% of a total of 300 spread nuclei displayed butterfly‐like chromosomes. An increase in tightly cohesed (‘zipped’) chromosomes could not be detected. IF THIS IMAGE HAS BEEN PROVIDED BY OR IS OWNED BY A THIRD PARTY, AS INDICATED IN THE CAPTION LINE, THEN FURTHER PERMISSION MAY BE NEEDED BEFORE ANY FURTHER USE. PLEASE CONTACT WILEY'S PERMISSIONS DEPARTMENT ON PERMISSIONS@WILEY.COM OR USE THE RIGHTSLINK SERVICE BY CLICKING ON THE 'REQUEST PERMISSIONS' LINK ACCOMPANYING THIS ARTICLE. WILEY OR AUTHOR OWNED IMAGES MAY BE USED FOR NON-COMMERCIAL PURPOSES, SUBJECT TO PROPER CITATION OF THE ARTICLE, AUTHOR, AND PUBLISHER. EMBO J, Volume: 32, Issue: 5, Pages: 666-676, First published: 29 January 2013, DOI: (10.1038/emboj.2013.7)