title: Hos1 deacetylates Smc3 to close the cohesin acetylation cycle.
abstract: Cohesion between sister chromatids is mediated by the chromosomal cohesin complex. In budding yeast, cohesin is loaded onto chromosomes during the G1 phase of the cell cycle. During S phase, the replication fork-associated acetyltransferase Eco1 acetylates the cohesin subunit Smc3 to promote the establishment of sister chromatid cohesion. At the time of anaphase, Smc3 loses its acetylation again, but the Smc3 deacetylase and the possible importance of Smc3 deacetylation are unknown. Here, we show that the class I histone deacetylase family member Hos1 is responsible for Smc3 deacetylation. Cohesin is protected from deacetylation while bound to chromosomes but is deacetylated as soon as it dissociates from chromosomes at anaphase onset. Nonacetylated Smc3 is required as a substrate for cohesion establishment in the following cell cycle. Our results complete the description of an Smc3 acetylation cycle and provide unexpected insight into the importance of de novo Smc3 acetylation for cohesion establishment.
authors.affiliation: Chromosome Segregation Laboratory, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3PX, UK.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Borges
authors.forename: Chris
authors.initials: C
authors.lastname: Lehane
authors.forename: Lidia
authors.initials: L
authors.lastname: Lopez-Serra
authors.forename: Helen
authors.initials: H
authors.lastname: Flynn
authors.forename: Mark
authors.initials: M
authors.lastname: Skehel
authors.forename: Tom
authors.initials: T
authors.lastname: Rolef Ben-Shahar
authors.forename: Frank
authors.initials: F
authors.lastname: Uhlmann
mesh_terms: D000107:Acetylation; D000123:Acetyltransferases / Q000235:genetics / Q000378:metabolism; D000705:Anaphase / Q000502:physiology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics / Q000378:metabolism*; D015825:Chromosomes, Fungal / Q000235:genetics / Q000378:metabolism; D016193:G1 Phase / Q000502:physiology; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D016196:S Phase / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D000097722:Cohesins
chemical_list: D000123:Acetyltransferases; D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D006655:Histone Deacetylases; D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; D000097722:Cohesins; C120372:SMC3 protein, S cerevisiae; C118076:ECO1 protein, S cerevisiae