6bzf
From Proteopedia
Structure of S. cerevisiae Zip2:Spo16 complex, C2 form
Structural highlights
Function[ZIP2_YEAST] Required for initiation of meiotic chromosome synapsis. Involved in synaptonemal complex formation, a structure that tethers a pair of homologous chromosomes along their lengths and plays a central role in recombination and homolog segregation during meiosis. Required for the normal localization of MSH4 to chromosomes.[1] [2] [3] [4] [5] [6] [7] [SPO16_YEAST] Necessary for efficient spore formation. Publication Abstract from PubMedIn eukaryotic meiosis, generation of haploid gametes depends on the formation of inter-homolog crossovers, which enable the pairing, physical linkage, and eventual segregation of homologs in the meiosis I division. A class of conserved meiosis-specific proteins, collectively termed ZMMs, are required for formation and spatial control of crossovers throughout eukaryotes. Here, we show that three Saccharomyces cerevisiae ZMM proteins-Zip2, Zip4 and Spo16-interact with one another and form a DNA-binding complex critical for crossover formation and control. We determined the crystal structure of a Zip2:Spo16 subcomplex, revealing a heterodimer structurally related to the XPF:ERCC1 endonuclease complex. Zip2:Spo16 lacks an endonuclease active site, but binds specific DNA structures found in early meiotic recombination intermediates. Mutations in multiple DNA-binding surfaces on Zip2:Spo16 severely compromise DNA binding, supporting a model in which the complex's central and HhH domains cooperate to bind DNA. Overall, our data support a model in which the Zip2:Zip4:Spo16 complex binds and stabilizes early meiotic recombination intermediates, then coordinates additional factors to promote crossover formation and license downstream events including synaptonemal complex assembly. The conserved XPF:ERCC1-like Zip2:Spo16 complex controls meiotic crossover formation through structure-specific DNA binding.,Arora K, Corbett KD Nucleic Acids Res. 2018 Dec 19. pii: 5253063. doi: 10.1093/nar/gky1273. PMID:30566683[8] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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