2GUS

Conformational Transition between Four- and Five-stranded Phenylalanine Zippers Determined by a Local Packing Interaction


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Conformational Transition between Four and Five-stranded Phenylalanine Zippers Determined by a Local Packing Interaction.

Liu, J.Zheng, Q.Deng, Y.Kallenbach, N.R.Lu, M.

(2006) J.Mol.Biol. 361: 168-179

  • DOI: 10.1016/j.jmb.2006.05.063
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Alpha-helical coiled coils play a crucial role in mediating specific protein-protein interactions. However, the rules and mechanisms that govern helix-helix association in coiled coils remain incompletely understood. Here we have engineered a seven h ...

    Alpha-helical coiled coils play a crucial role in mediating specific protein-protein interactions. However, the rules and mechanisms that govern helix-helix association in coiled coils remain incompletely understood. Here we have engineered a seven heptad "Phe-zipper" protein (Phe-14) with phenylalanine residues at all 14 hydrophobic a and d positions, and generated a further variant (Phe-14(M)) in which a single core Phe residue is substituted with Met. Phe-14 forms a discrete alpha-helical pentamer in aqueous solution, while Phe-14(M) folds into a tetrameric helical structure. X-ray crystal structures reveal that in both the tetramer and the pentamer the a and d side-chains interlock in a classical knobs-into-holes packing to produce parallel coiled-coil structures enclosing large tubular cavities. However, the presence of the Met residue in the apolar interface of the tetramer markedly alters its local coiled-coil conformation and superhelical geometry. Thus, short-range interactions involving the Met side-chain serve to preferentially select for tetramer formation, either by inhibiting a nucleation step essential for pentamer folding or by abrogating an intermediate required to form the pentamer. Although specific trigger sequences have not been clearly identified in dimeric coiled coils, higher-order coiled coils, as well as other oligomeric multi-protein complexes, may require such sequences to nucleate and direct their assembly.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Major outer membrane lipoprotein
A
56Escherichia coli (strain K12)Mutation(s): 14 
Gene Names: lpp (mlpA, mulI)
Find proteins for P69776 (Escherichia coli (strain K12))
Go to UniProtKB:  P69776
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.238 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 37.002α = 90.00
b = 37.002β = 90.00
c = 80.949γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
SCALEPACKdata scaling
REFMACrefinement
SOLVEphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-07-25
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Derived calculations, Version format compliance