Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: SAXS

Macromolecule Content

• Total Structure Weight: 45.54 kDa 
• Atom Count: 3318 
• Modelled Residue Count: 383 
• Deposited Residue Count: 392 
• Unique protein chains: 1

6F63

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

• DOI: 10.2210/pdb6F63/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2017-12-04 Released: 2018-06-06 
• Deposition Author(s): Dunce, J.M., Millan, C., Uson, I., Davies, O.R.
• Funding Organization(s): Wellcome Trust and Royal Society

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.253 
• R-Value Work: 0.219 
• R-Value Observed: 0.220 

Literature

Structural basis of meiotic chromosome synapsis through SYCP1 self-assembly.

Dunce, J.M., Dunne, O.M., Ratcliff, M., Millan, C., Madgwick, S., Uson, I., Davies, O.R.

(2018) Nat Struct Mol Biol 25: 557-569

• PubMed: 29915389 
• DOI: 10.1038/s41594-018-0078-9
• Primary Citation of Related Structures:  
  6F5X, 6F63, 6F62, 6F64


• PubMed Abstract: 
  

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.

---

Organizational Affiliation: 

Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Synaptonemal complex protein 1	A, B, C, D	98	Homo sapiens	Mutation(s): 0  Gene Names: SYCP1, SCP1
Find proteins for Q15431 (Homo sapiens) Explore Q15431  Go to UniProtKB:  Q15431
NIH Common Fund Data Resources
PHAROS:  Q15431 GTEx:  ENSG00000198765

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.253 
• R-Value Work: 0.219 
• R-Value Observed: 0.220 
• Space Group: C 1 2 1
• Diffraction Data DOI: 10.18430/m36f63 Protein Diffraction

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 233.42	α = 90
b = 42.85	β = 93.61
c = 43.69	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
Arcimboldo	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-12-04 
• Released Date: 2018-06-06 
Deposition Author(s): Dunce, J.M., Millan, C., Uson, I., Davies, O.R.

---

Funding Organization	Location	Grant Number
Wellcome Trust and Royal Society	United Kingdom	104158/Z/14/Z

Revision History  

• Version 1.0: 2018-06-06
  Type: Initial release
  
• Version 1.1: 2018-07-04
  Changes: Data collection, Database references
• Version 1.2: 2018-08-01
  Changes: Data collection, Database references
• Version 1.3: 2020-04-22
  Changes: Database references