Crystal Structure of a Novel Alanine-Zipper Trimer at 1.3 A Resolution, I6A,L9A,V13A,L16A,V20A,L23A,V27A,M30A,V34A,L48A,M51A mutations

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.149 

Starting Model: experimental
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An Alanine-Zipper Structure Determined by Long Range Intermolecular Interactions

Liu, J.Lu, M.

(2002) J Biol Chem 277: 48708-48713

  • DOI: https://doi.org/10.1074/jbc.M208773200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    A major challenge in protein folding is to identify and quantify specific structural determinants that allow native proteins to acquire their unique folded structures. Here we report the engineering of a 52-residue protein (Ala-14) that contains exclusively alanine residues at the hydrophobic a and d positions of a natural heptad-repeat sequence. Ala-14 is unfolded under normal solution conditions yet forms a parallel three-stranded alpha-helical coiled coil in crystals. Ala-14 trimers in the solid state associate with each other through the pairing of polar side chains and formation of an extended network of water-mediated hydrogen bonds. In contrast to the classical view that local intramolecular tertiary interactions dictate the three-dimensional structure of small single-domain proteins, Ala-14 shows that long range intermolecular interactions can be essential in determining the metastable alanine-zipper structure. A similar interplay between short range local and longer range global forces may underlie the conformational properties of the growing class of natively unstructured proteins in biological processes.

  • Organizational Affiliation

    Department of Biochemistry, Weill Medical College of Cornell University, New York, New York 10021, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
52Escherichia coliMutation(s): 11 
Find proteins for P69776 (Escherichia coli (strain K12))
Explore P69776 
Go to UniProtKB:  P69776
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69776
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.149 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 21.842α = 88.05
b = 26.935β = 84.95
c = 45.805γ = 87.56
Software Package:
Software NamePurpose
MADNESSdata collection
SCALEPACKdata scaling
MADNESSdata reduction

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2003-06-17 
  • Deposition Author(s): Liu, J., Lu, M.

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2021-10-27
    Changes: Database references
  • Version 1.5: 2023-08-16
    Changes: Data collection, Refinement description