Crystal structure of a CC-Hex mutant that forms a parallel six-helix coiled coil CC-Hex*-L24Nle

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Navigating the Structural Landscape of De Novo alpha-Helical Bundles.

Rhys, G.G.Wood, C.W.Beesley, J.L.Zaccai, N.R.Burton, A.J.Brady, R.L.Thomson, A.R.Woolfson, D.N.

(2019) J Am Chem Soc 141: 8787-8797

  • DOI: https://doi.org/10.1021/jacs.8b13354
  • Primary Citation of Related Structures:  
    6Q5H, 6Q5I, 6Q5J, 6Q5K, 6Q5L, 6Q5M, 6Q5N, 6Q5O, 6Q5P, 6Q5Q, 6Q5R, 6Q5S

  • PubMed Abstract: 

    The association of amphipathic α helices in water leads to α-helical-bundle protein structures. However, the driving force for this-the hydrophobic effect-is not specific and does not define the number or the orientation of helices in the associated state. Rather, this is achieved through deeper sequence-to-structure relationships, which are increasingly being discerned. For example, for one structurally extreme but nevertheless ubiquitous class of bundle-the α-helical coiled coils-relationships have been established that discriminate between all-parallel dimers, trimers, and tetramers. Association states above this are known, as are antiparallel and mixed arrangements of the helices. However, these alternative states are less well understood. Here, we describe a synthetic-peptide system that switches between parallel hexamers and various up-down-up-down tetramers in response to single-amino-acid changes and solution conditions. The main accessible states of each peptide variant are characterized fully in solution and, in most cases, to high resolution with X-ray crystal structures. Analysis and inspection of these structures helps rationalize the different states formed. This navigation of the structural landscape of α-helical coiled coils above the dimers and trimers that dominate in nature has allowed us to design rationally a well-defined and hyperstable antiparallel coiled-coil tetramer (apCC-Tet). This robust de novo protein provides another scaffold for further structural and functional designs in protein engineering and synthetic biology.

  • Organizational Affiliation

    School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
32synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GOL

Download Ideal Coordinates CCD File 
M [auth A]
N [auth B]
O [auth B]
P [auth C]
Q [auth D]
M [auth A],
N [auth B],
O [auth B],
P [auth C],
Q [auth D],
R [auth D],
S [auth F],
U [auth H],
V [auth I],
W [auth J],
X [auth L]
C3 H8 O3
Query on DIO

Download Ideal Coordinates CCD File 
C4 H8 O2
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on NLE
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.19α = 90
b = 59.29β = 90
c = 143.77γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/J014400/1
Engineering and Physical Sciences Research CouncilUnited KingdomEP/G036764/1
European Research CouncilBelgium340764
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/R00661X/1
Engineering and Physical Sciences Research CouncilUnited KingdomEP/K03927X/1

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-22
    Type: Initial release
  • Version 1.1: 2019-06-19
    Changes: Data collection, Database references