Crystal structure of a parallel six-helix coiled coil CC-Type2-LL

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 

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Maintaining and breaking symmetry in homomeric coiled-coil assemblies.

Rhys, G.G.Wood, C.W.Lang, E.J.M.Mulholland, A.J.Brady, R.L.Thomson, A.R.Woolfson, D.N.

(2018) Nat Commun 9: 4132-4132

  • DOI: https://doi.org/10.1038/s41467-018-06391-y
  • Primary Citation of Related Structures:  
    6G65, 6G66, 6G67, 6G68, 6G69, 6G6A, 6G6B, 6G6C, 6G6D, 6G6E, 6G6F, 6G6G, 6G6H

  • PubMed Abstract: 

    In coiled-coil (CC) protein structures α-helices wrap around one another to form rope-like assemblies. Most natural and designed CCs have two-four helices and cyclic (C n ) or dihedral (D n ) symmetry. Increasingly, CCs with five or more helices are being reported. A subset of these higher-order CCs is of interest as they have accessible central channels that can be functionalised; they are α-helical barrels. These extended cavities are surprising given the drive to maximise buried hydrophobic surfaces during protein folding and assembly in water. Here, we show that α-helical barrels can be maintained by the strategic placement of β-branched aliphatic residues lining the lumen. Otherwise, the structures collapse or adjust to give more-complex multi-helix assemblies without C n or D n symmetry. Nonetheless, the structural hallmark of CCs-namely, knobs-into-holes packing of side chains between helices-is maintained leading to classes of CCs hitherto unobserved in nature or accessed by design.

  • Organizational Affiliation

    School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK. Guto.Rhys@bristol.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
32synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.529α = 90
b = 103.529β = 90
c = 103.529γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Engineering and Physical Sciences Research CouncilUnited KingdomEP/G036764/1
European Research CouncilUnited Kingdom340764

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-17
    Type: Initial release
  • Version 1.1: 2024-05-08
    Changes: Advisory, Data collection, Database references