Cited by 23Genomics and Chromatin DynamicsDNA Repair MechanismsProtein Structure and Dynamics

What AlphaFold tells us about cohesin’s retention on and release from chromosomes

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Nasmyth, Kim A, Lee, Byung-Gil, Roig, Maurici Brunet, Löwe, Jan·2023·eLife

Published version of a preprint

Abstract

Cohesin is a trimeric complex containing a pair of SMC proteins (Smc1 and Smc3) whose ATPase domains at the end of long coiled coils (CC) are interconnected by Scc1. During interphase, it organizes chromosomal DNA topology by extruding loops in a manner dependent on Scc1’s association with two large hook-shaped proteins called SA (yeast: Scc3) and Nipbl (Scc2). The latter’s replacement by Pds5 recruits Wapl, which induces release from chromatin via a process requiring dissociation of Scc1’s N-terminal domain (NTD) from Smc3. If blocked by Esco (Eco)-mediated Smc3 acetylation, cohesin containing Pds5 merely maintains pre-existing loops, but a third fate occurs during DNA replication, when Pds5-containing cohesin associates with Sororin and forms structures that hold sister DNAs together. How Wapl induces and Sororin blocks release has hitherto remained mysterious. In the 20 years since their discovery, not a single testable hypothesis has been proposed as to their role. Here, AlphaFold 2 (AF) three-dimensional protein structure predictions lead us to propose formation of a quarternary complex between Wapl, SA, Pds5, and Scc1’s NTD, in which the latter is juxtaposed with (and subsequently sequestered by) a highly conserved cleft within Wapl’s C-terminal domain. AF also reveals how Scc1’s dissociation from Smc3 arises from a distortion of Smc3’s CC induced by engagement of SMC ATPase domains, how Esco acetyl transferases are recruited to Smc3 by Pds5, and how Sororin prevents release by binding to the Smc3/Scc1 interface. Our hypotheses explain the phenotypes of numerous existing mutations and are highly testable.

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Authors
Nasmyth, K. A., Lee, B.-G., Roig, M. B., & Löwe, J.
Affiliations
  • University of Oxford (GB)
  • MRC Laboratory of Molecular Biology (GB)
Venue
eLife
Published
2023-11-17
Volume
12
ISSN
2050-084X (ISSN-L)
OpenAlex
W4388763251
Cited by
21
References
79
Citations by year
2026: 7 · 2025: 7 · 2024: 6 · 2023: 1
FWCI
1.87
Type
journal article
Language
en
Open access
Locations
eLife (publishedVersion, cc-by)
Funders
  • Medical Research Council (U105184326)
  • Cancer Research UK (26747)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
cohesin, WAPL, Pds5, SMC3, Sororin, sister chromatid cohesion, chromatin loop extrusion, Scc3, NIPBL, protein complex structure

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