1JCD

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

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.149 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

An Alanine-Zipper Structure Determined by Long Range Intermolecular Interactions

Liu, J.Lu, M.

(2002) J Biol Chem 277: 48708-48713

  • DOI: 10.1074/jbc.M208773200
  • Primary Citation of Related Structures:  
    1JCD

  • 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MAJOR OUTER MEMBRANE LIPOPROTEINA, B, C52Escherichia coliMutation(s): 11 
UniProt
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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
AMoREphasing
SHELXL-97refinement
MADNESSdata reduction

Structure Validation

View Full Validation Report



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