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• W2897588077 abstract "Abstract Accurate chromosome segregation during meiosis relies on the prior establishment of at least one crossover recombination event between homologous chromosomes, which is often associated with the meiosis-specific MutSγ complex. The recombination intermediates that give rise to MutSγ interhomolog crossovers are embedded within a hallmark meiotic prophase structure called the synaptonemal complex (SC), but the mechanisms that coordinate the processes of SC assembly (synapsis) and crossover recombination remain poorly understood. Among known central region building blocks of the budding yeast SC, the Zip1 protein is unique for its SC-independent role in promoting MutSγ crossovers. Here we report that adjacent regions within Zip1’s unstructured N terminus encompass its crossover and SC assembly functions. We previously showed that deletion of Zip1 residues 21-163 abolishes tripartite SC assembly and prevents the robust SUMOylation of the SC central element component, Ecm11, but allows excess MutSγ crossover recombination. We find the reciprocal phenotype when Zip1 residues 2-9 or 10-14 are deleted; in these mutants SC assembles and Ecm11 is hyperSUMOylated, but MutSγ crossovers are strongly diminished. Interestingly, Zip1 residues 2-9 or 2-14 are required for the normal localization of Zip3, a putative E3 SUMO ligase and pro-MutSγ crossover factor, to Zip1 polycomplex structures and to recombination initiation sites. By contrast, deletion of Zip1 residues 15-20 does not detectably prevent Zip3’s localization at Zip1 polycomplex and supports some MutSγ crossing over but prevents normal SC assembly and robust Ecm11 SUMOylation. These results highlight distinct N terminal regions that are differentially critical for Zip1’s roles in crossover recombination and SC assembly; we speculate that the adjacency of these regions enables Zip1 to serve as a liaison, facilitating crosstalk between the two processes by bringing crossover recombination and synapsis factors in close proximity to one another." @default.
• W2897588077 created "2018-10-26" @default.
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• W2897588077 date "2018-10-24" @default.
• W2897588077 modified "2023-10-02" @default.
• W2897588077 title "Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein" @default.
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• W2897588077 doi "https://doi.org/10.1101/451674" @default.
• W2897588077 hasPublicationYear "2018" @default.
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