Crystal structure of VSHP_BPP21 in space group H3 with high resolution.

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.196 
  • R-Value Observed: 0.126 

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This is version 1.4 of the entry. See complete history


Kinetic Stability and Crystal Structure of the Viral Capsid Protein SHP.

Forrer, P.Chang, C.Ott, D.Wlodawer, A.Plueckthun, A.

(2004) J Mol Biol 344: 179-193

  • DOI: https://doi.org/10.1016/j.jmb.2004.09.030
  • Primary Citation of Related Structures:  
    1TD0, 1TD3, 1TD4

  • PubMed Abstract: 

    SHP, the capsid-stabilizing protein of lambdoid phage 21, is highly resistant against denaturant-induced unfolding. We demonstrate that this high functional stability of SHP is due to a high kinetic stability with a half-life for unfolding of 25 days at zero denaturant, while the thermodynamic stability is not unusually high. Unfolding experiments demonstrated that the trimeric state (also observed in crystals and present on the phage capsid) of SHP is kinetically stable in solution, while the monomer intermediate unfolds very rapidly. We also determined the crystal structure of trimeric SHP at 1.5A resolution, which was compared to that of its functional homolog gpD. This explains how a tight network of H-bonds rigidifies crucial interpenetrating residues, leading to the observed extremely slow trimer dissociation or denaturation. Taken as a whole, our results provide molecular-level insights into natural strategies to achieve kinetic stability by taking advantage of protein oligomerization. Kinetic stability may be especially needed in phage capsids to allow survival in harsh environments.

  • Organizational Affiliation

    Biochemisches Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Head decoration protein115Enterobacteria phage P21Mutation(s): 1 
Find proteins for P36275 (Enterobacteria phage P21)
Explore P36275 
Go to UniProtKB:  P36275
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP36275
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.196 
  • R-Value Observed: 0.126 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.909α = 90
b = 53.909β = 90
c = 77.456γ = 120
Software Package:
Software NamePurpose
SHELXmodel building
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-12-21
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-09-20
    Changes: Data collection, Refinement description