Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Observed: 0.167 

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Structure of a hinge-bending bacteriophage T4 lysozyme mutant, Ile3-->Pro.

Dixon, M.M.Nicholson, H.Shewchuk, L.Baase, W.A.Matthews, B.W.

(1992) J Mol Biol 227: 917-933

  • DOI: https://doi.org/10.1016/0022-2836(92)90231-8
  • Primary Citation of Related Structures:  
    1L96, 1L97

  • PubMed Abstract: 

    The mutant T4 phage lysozyme in which isoleucine 3 is replaced by proline (I3P) crystallizes in an orthorhombic form with two independent molecules in the asymmetric unit. Relative to wild-type lysozyme, which crystallizes in a trigonal form, the two I3P molecules undergo large hinge-bending displacements with the alignments of the amino-terminal and carboxy-terminal domains changed by 28.9 degrees and 32.9 degrees, respectively. The introduction of the mutation, together with the hinge-bending displacement, is associated with repacking of the side-chains of Phe4, Phe67 and Phe104. These aromatic residues are clustered close to the site of the mutation and are at the junction between the amino and carboxyl-terminal domains. As a result of this structural rearrangement the side-chain of Phe4 moves from a relatively solvent-exposed conformation to one that is largely buried. Mutant I3P also crystallizes in the same trigonal form as wild-type and, in this case, the observed structural changes are restricted to the immediate vicinity of the replacement. The main change is a shift of 0.3 to 0.5 A in the backbone of residues 1 to 5. The ability to crystallize I3P under similar conditions but in substantially different conformations suggests that the molecule undergoes large-scale hinge-bending displacements in solution. It is also likely that these conformational excursions are associated with repacking at the junction of the N-terminal and C-terminal domains. On the other hand, the analysis is complicated by possible effects of crystal packing. The different I3P crystal structures show substantial differences in the binding of solvent, both at the site of the Ile3-->Pro replacement and at other internal sites.

  • Organizational Affiliation

    Institute of Molecular Biology, Howard Hughes Medical Institute, Eugene, OR.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
164Tequatrovirus T4Mutation(s): 0 
Find proteins for P00720 (Enterobacteria phage T4)
Explore P00720 
Go to UniProtKB:  P00720
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00720
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Observed: 0.167 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.5α = 90
b = 96.6β = 90
c = 39.2γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Derived calculations