A Molecular Determinant for the Establishment of Sister Chromatid Cohesion
2008; American Association for the Advancement of Science; Volume: 321; Issue: 5888 Linguagem: Inglês
10.1126/science.1157880
ISSN1095-9203
AutoresElçin Ünal, Jill M. Heidinger-Pauli, Woong Kim, Vincent Guacci, Itay Onn, Steven P. Gygi, Douglas Koshland,
Tópico(s)DNA Repair Mechanisms
ResumoChromosome segregation, transcriptional regulation, and repair of DNA double-strand breaks require the cohesin protein complex. Cohesin holds the replicated chromosomes (sister chromatids) together to mediate sister chromatid cohesion. The mechanism of how cohesion is established is unknown. We found that in budding yeast, the head domain of the Smc3p subunit of cohesin is acetylated by the Eco1p acetyltransferase at two evolutionarily conserved residues, promoting the chromatin-bound cohesin to tether sister chromatids. Smc3p acetylation is induced in S phase after the chromatin loading of cohesin and is suppressed in G(1) and G(2)/M. Smc3 head acetylation and its cell cycle regulation provide important insights into the biology and mechanism of cohesion establishment.
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