PreprintCited by 112Genomics and Chromatin DynamicsDNA Repair MechanismsDiffusion and Search Dynamics

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A hold-and-feed mechanism drives directional DNA loop extrusion by condensin

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Preprint — published as 10.1126/science.abm4012 · Paper page

Abstract

SMC protein complexes structure genomes by extruding DNA loops, but the molecular mechanism that underlies their activity has remained unknown. We show that the active condensin complex entraps the bases of a DNA loop in two separate chambers. Single-molecule and cryo-electron microscopy provide evidence for a power-stroke movement at the first chamber that feeds DNA into the SMC-kleisin ring upon ATP binding, while the second chamber holds on upstream of the same DNA double helix. Unlocking the strict separation of ‘motor’ and ‘anchor’ chambers turns condensin from a one-sided into a bidirectional DNA loop extruder. We conclude that the orientation of two topologically bound DNA segments during the course of the SMC reaction cycle determines the directionality of DNA loop extrusion.

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Metadata

Authors
Shaltiel, I. A., Datta, S., Lecomte, L., Hassler, M., Kschonsak, M., Bravo, S., Stober, C., Eustermann, S., & Haering, C. H.
Affiliations
  • Heidelberg University (DE)
  • University of Würzburg (DE)
  • European Molecular Biology Laboratory (DE)
Corresponding author
  • Datta, Sumanjit
  • Lecomte, Léa
  • Eustermann, Sebastian
  • Haering, Christian H.
Venue
Science
Publisher
openRxiv
Published
2021-10-29
Volume
376
Issue
6597
Pages
1087-1094
ISSN
0036-8075 (ISSN-L)
OpenAlex
W4281793572
Cited by
112
References
1
Citations by year
2026: 18 · 2025: 24 · 2024: 24 · 2023: 27 · 2022: 19
FWCI
7.68
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Science (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek
  • Darwin Trust of Edinburgh
  • H2020 European Research Council (681365)
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 › Diffusion and Search Dynamics
Keywords
condensin, DNA loop extrusion, structural maintenance of chromosomes, power stroke, ATP binding, chromosome organization, single-molecule imaging, cryo-electron microscopy
MeSH terms
Single Molecule Imaging, Adenosine Triphosphatases, DNA, DNA-Binding Proteins, Nucleic Acid Conformation, Cryoelectron Microscopy, Multiprotein Complexes

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