DOI: 10.1101/451674Oct 24, 2018Paper

Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein

BioRxiv : the Preprint Server for Biology
Karen Voelkel-MeimanAmy J MacQueen


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-...Continue Reading

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