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Closing the cohesin ring: structure and function of its Smc3-kleisin interface

journal contribution
posted on 2023-06-08, 19:38 authored by Thomas G Gligoris, Johanna C Scheinost, Frank Bürmann, Naomi Petela, Kok-Lung ChanKok-Lung Chan, Pelin Uluocak, Frédéric Beckouët, Stephan Gruber, Kim Nasmyth, Jan Löwe
Through their association with a kleisin subunit (Scc1), cohesin’s Smc1 and Smc3 subunits are thought to form tripartite rings that mediate sister chromatid cohesion. Unlike the structure of Smc1/Smc3 and Smc1/Scc1 interfaces, that of Smc3/Scc1 is not known. Disconnection of this interface is thought to release cohesin from chromosomes in a process regulated by acetylation. We show here that the N-terminal domain of yeast Scc1 contains two a helices, forming a four-helix bundle with the coiled coil emerging from Smc3’s adenosine triphosphatase head. Mutations affecting this interaction compromise cohesin’s association with chromosomes. The interface is far from Smc3 residues, whose acetylation prevents cohesin’s dissociation from chromosomes. Cohesin complexes holding chromatids together in vivo do indeed have the configuration of hetero-trimeric rings, and sister DNAs are entrapped within these.

History

Publication status

  • Published

File Version

  • Published version

Journal

Science

ISSN

1095-9203

Publisher

American Association for the Advancement of Science

Issue

6212

Volume

346

Page range

963-967

Department affiliated with

  • Sussex Centre for Genome Damage Stability Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2015-01-20

First Compliant Deposit (FCD) Date

2015-01-20

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