6R17

Crystal structure of the SYCE2-TEX12 delta-Ctip 2:2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.42 Å
  • R-Value Free: 0.330 
  • R-Value Work: 0.287 
  • R-Value Observed: 0.291 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis of meiotic chromosome synaptic elongation through hierarchical fibrous assembly of SYCE2-TEX12.

Dunce, J.M.Salmon, L.J.Davies, O.R.

(2021) Nat Struct Mol Biol 28: 681-693

  • DOI: https://doi.org/10.1038/s41594-021-00636-z
  • Primary Citation of Related Structures:  
    6R17, 6YQF

  • PubMed Abstract: 

    The synaptonemal complex (SC) is a supramolecular protein assembly that mediates synapsis between homologous chromosomes during meiosis. SC elongation along the chromosome length (up to 24 μm) depends on its midline α-fibrous component SYCE2-TEX12. Here, we report X-ray crystal structures of human SYCE2-TEX12 as an individual building block and on assembly within a fibrous lattice. We combine these structures with mutagenesis, biophysics and electron microscopy to reveal the hierarchical mechanism of SYCE2-TEX12 fiber assembly. SYCE2-TEX12's building blocks are 2:2 coiled coils that dimerize into 4:4 hetero-oligomers and interact end-to-end and laterally to form 10-nm fibers that intertwine within 40-nm bundled micrometer-long fibers that define the SC's midline structure. This assembly mechanism bears striking resemblance with intermediate filament proteins vimentin, lamin and keratin. Thus, SYCE2-TEX12 exhibits behavior typical of cytoskeletal proteins to provide an α-fibrous SC backbone that structurally underpins synaptic elongation along meiotic chromosomes.


  • Organizational Affiliation

    Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Framlington Place, Newcastle upon Tyne, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Synaptonemal complex central element protein 2
A, B
112Homo sapiensMutation(s): 0 
Gene Names: SYCE2CESC1
UniProt & NIH Common Fund Data Resources
Find proteins for Q6PIF2 (Homo sapiens)
Explore Q6PIF2 
Go to UniProtKB:  Q6PIF2
PHAROS:  Q6PIF2
GTEx:  ENSG00000161860 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6PIF2
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Testis-expressed protein 12
C, D
69Homo sapiensMutation(s): 0 
Gene Names: TEX12
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BXU0 (Homo sapiens)
Explore Q9BXU0 
Go to UniProtKB:  Q9BXU0
PHAROS:  Q9BXU0
GTEx:  ENSG00000150783 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BXU0
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.52α = 90
b = 24.19β = 115.74
c = 88.48γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
STARANISOdata scaling
PHASERphasing
Arcimboldophasing
SHELXEmodel building
PHENIXmodel building

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom104158/Z/14/Z
Royal SocietyUnited KingdomRG170118

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-30
    Type: Initial release
  • Version 1.1: 2021-09-15
    Changes: Database references, Refinement description