6YQF

Crystal structure of the SYCE2-TEX12 delta-Ctip complex in a 4:4 assembly


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.33 Å
  • R-Value Free: 0.367 
  • R-Value Work: 0.327 
  • R-Value Observed: 0.329 

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: 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 ...

    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

    Wellcome Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh, Michael Swann Building, Max Born Crescent, Edinburgh, UK. owen.davies@ed.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Synaptonemal complex central element protein 2A, B112Homo 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
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Testis-expressed protein 12C, D69Homo sapiensMutation(s): 0 
Gene Names: TEX12
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BXU0 (Homo sapiens)
Explore Q9BXU0 
Go to UniProtKB:  Q9BXU0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.67α = 90
b = 59.68β = 90
c = 156.49γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
STARANISOdata scaling
PHASERphasing
Cootmodel building
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom104158/Z/14/Z
Wellcome TrustUnited Kingdom219413/Z/19/Z
Royal SocietyUnited KingdomRG170118

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-28
    Type: Initial release
  • Version 1.1: 2021-09-15
    Changes: Database references