6f63

Crystal structure of the SYCP1 C-terminal back-to-back assembly

spinqualitylabelsall models 6f63, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6f63 is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.154Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SYCP1_HUMAN Major component of the transverse filaments of synaptonemal complexes (SCS), formed between homologous chromosomes during meiotic prophase. Required for normal assembly of the central element of the synaptonemal complexes. Required for normal centromere pairing during meiosis. Required for normal meiotic chromosome synapsis during oocyte and spermatocyte development and for normal male and female fertility.[UniProtKB:Q62209] Publication Abstract from PubMed Meiotic chromosomes adopt unique structures in which linear arrays of chromatin loops are bound together in homologous chromosome pairs by a supramolecular protein assembly, the synaptonemal complex. This three-dimensional scaffold provides the essential structural framework for genetic exchange by crossing over and subsequent homolog segregation. The core architecture of the synaptonemal complex is provided by SYCP1. Here we report the structure and self-assembly mechanism of human SYCP1 through X-ray crystallographic and biophysical studies. SYCP1 has an obligate tetrameric structure in which an N-terminal four-helical bundle bifurcates into two elongated C-terminal dimeric coiled-coils. This building block assembles into a zipper-like lattice through two self-assembly sites. N-terminal sites undergo cooperative head-to-head assembly in the midline, while C-terminal sites interact back to back on the chromosome axis. Our work reveals the underlying molecular structure of the synaptonemal complex in which SYCP1 self-assembly generates a supramolecular lattice that mediates meiotic chromosome synapsis. Structural basis of meiotic chromosome synapsis through SYCP1 self-assembly.,Dunce JM, Dunne OM, Ratcliff M, Millan C, Madgwick S, Uson I, Davies OR Nat Struct Mol Biol. 2018 Jun 18. pii: 10.1038/s41594-018-0078-9. doi:, 10.1038/s41594-018-0078-9. PMID:29915389 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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