PreprintCited by 15DNA Repair MechanismsFungal and yeast genetics researchMicrotubule and mitosis dynamics

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Mer3 helicase protects early crossover intermediates from STR complex disassembly during meiosis

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Altmannova, Veronika, Firlej, Magdalena, Müller, Franziska, Janning, Petra, Rauleder, Rahel, Rousova, Dorota, Schäffler, Andreas, Weir, John R.·2022·Nucleic Acids Research

Preprint — published as 10.1093/nar/gkad175 · Paper page

Abstract

During meiosis I it is necessary that homologous chromosomes are linked to one another so that they can be faithfully separated. S. cerevisiae Mer3 (HFM1 in mammals) is a SF2 helicase and member of the ZMM group of proteins, that facilitates the formation of class I crossovers during meiosis. Here we describe the structural organisation of Mer3 and, using AlphaFold modelling and XL-MS, we further characterise the previously described interaction with Mlh1-Mlh2. We find that Mer3 also forms a previously undescribed complex with the recombination regulating factors Top3 and Rmi1 and that this interaction is competitive with Sgs1 BLM helicase in a phospho-dependent manner. Using in vitro reconstituted D-loop assays we show that Mer3 inhibits the anti-recombination activity of Sgs1/Top3/Rmi1 (STR) complex. Thus we provide a mechanism whereby Mer3 downregulates the anti-crossover activity of the STR complex, hence promoting the formation of crossovers during meiosis I.

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Metadata

Authors
Altmannova, V., Firlej, M., Müller, F., Janning, P., Rauleder, R., Rousova, D., Schäffler, A., & Weir, J. R.
Affiliations
  • Max Planck Society (DE)
  • Max Planck Institute of Molecular Physiology (DE)
Corresponding author
Weir, John R.
Venue
Nucleic Acids Research
Publisher
openRxiv
Published
2022-06-27
Volume
51
Issue
9
Pages
4363-4384
ISSN
0305-1048 (ISSN-L)
OpenAlex
W4328049435
Cited by
15
References
1
Citations by year
2026: 5 · 2025: 5 · 2024: 2 · 2023: 3
FWCI
1.34
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Nucleic Acids Research (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • Deutsche Forschungsgemeinschaft
  • Max-Planck-Gesellschaft
  • Masarykova Univerzita
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
Keywords
meiotic recombination, crossing over, Sgs1 helicase, BLM helicase, DMC1, protein-protein interaction, Saccharomyces cerevisiae
MeSH terms
MutL Proteins, MutL Protein Homolog 1, Binding, Competitive, Crossing Over, Genetic, DNA Helicases, DNA-Binding Proteins, Meiosis, Protein Binding, Saccharomyces cerevisiae, Protein Folding, Cell Cycle Proteins, Saccharomyces cerevisiae Proteins, RecQ Helicases, Homologous Recombination

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