1L10

STRUCTURAL STUDIES OF MUTANTS OF THE LYSOZYME OF BACTERIOPHAGE T4. THE TEMPERATURE-SENSITIVE MUTANT PROTEIN THR157 (RIGHT ARROW) ILE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Observed: 0.173 

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This is version 1.4 of the entry. See complete history


Literature

Structural studies of mutants of the lysozyme of bacteriophage T4. The temperature-sensitive mutant protein Thr157----Ile.

Grutter, M.G.Gray, T.M.Weaver, L.H.Wilson, T.A.Matthews, B.W.

(1987) J Mol Biol 197: 315-329

  • DOI: 10.1016/0022-2836(87)90126-4
  • Primary Citation of Related Structures:  
    1L01, 1L10

  • PubMed Abstract: 
  • To understand the roles of individual amino acids in the folding and stability of globular proteins, a systematic structural analysis of mutants of the lysozyme of bacteriophage T4 has been undertaken. The isolation, characterization, crystallographic refinement and structural analysis of a temperature-sensitive lysozyme in which threonine 157 is replaced by isoleucine is reported here ...

    To understand the roles of individual amino acids in the folding and stability of globular proteins, a systematic structural analysis of mutants of the lysozyme of bacteriophage T4 has been undertaken. The isolation, characterization, crystallographic refinement and structural analysis of a temperature-sensitive lysozyme in which threonine 157 is replaced by isoleucine is reported here. This mutation reduces the temperature of the midpoint of the reversible thermal denaturation transition by 11 deg.C at pH 2.0. Electron density maps showing differences between the wild-type and mutant X-ray crystal structures have obvious features corresponding to the substitution of threonine 157 by isoleucine. There is little difference electron density in the remainder of the molecule, indicating that the structural changes are localized to the site of the mutation. High-resolution crystallographic refinement of the mutant lysozyme structure confirms that it is very similar to wild-type lysozyme. The largest conformational differences are in the gamma-carbon of residue 157 and in the side-chain of Asp159, which shift 1.0 A and 1.1 A, respectively. In the wild-type enzyme, the gamma-hydroxyl group of Thr157 participates in a network of hydrogen bonds. Substitution of Thr157 with an isoleucine disrupts this set of hydrogen bonds. A water molecule bound in the vicinity of Thr155 partially restores the hydrogen bond network in the mutant structure, but the buried main-chain amide of Asp159 is not near a hydrogen bond acceptor. This unsatisfied hydrogen-bonding potential is the most obvious reason for the reduction in stability of the temperature-sensitive mutant protein.


    Related Citations: 
    • Contributions of Hydrogen Bonds of Thr 157 to the Thermodynamic Stability of Phage T4 Lysozyme
      Alber, T., Dao-Pin, S., Wilson, K., Wozniak, J.A., Cook, S.P., Matthews, B.W.
      (1987) Nature 330: 41
    • Structural Analysis of the Temperature-Sensitive Mutant of Bacteriophage T4 Lysozyme, Glycine 156 (Right Arrow) Aspartic Acid
      Gray, T.M., Matthews, B.W.
      (1987) J Biol Chem 262: 16858
    • Structure of Bacteriophage T4 Lysozyme Refined at 1.7 Angstroms Resolution
      Weaver, L.H., Matthews, B.W.
      (1987) J Mol Biol 193: 189
    • Temperature-Sensitive Mutations of Bacteriophage T4 Lysozyme Occur at Sites with Low Mobility and Low Solvent Accessibility in the Folded Protein
      Alber, T., Dao-Pin, S., Nye, J.A., Muchmore, D.C., Matthews, B.W.
      (1987) Biochemistry 26: 3754
    • Common Precursor of Lysozymes of Hen Egg-White and Bacteriophage T4
      Matthews, B.W., Gruetter, M.G., Anderson, W.F., Remington, S.J.
      (1981) Nature 290: 334
    • Crystallographic Determination of the Mode of Binding of Oligosaccharides to T4 Bacteriophage Lysozyme. Implications for the Mechanism of Catalysis
      Anderson, W.F., Gruetter, M.G., Remington, S.J., Weaver, L.H., Matthews, B.W.
      (1981) J Mol Biol 147: 523
    • Relation between Hen Egg White Lysozyme and Bacteriophage T4 Lysozyme. Evolutionary Implications
      Matthews, B.W., Remington, S.J., Gruetter, M.G., Anderson, W.F.
      (1981) J Mol Biol 147: 545
    • Structure of the Lysozyme from Bacteriophage T4, an Electron Density Map at 2.4 Angstroms Resolution
      Remington, S.J., Anderson, W.F., Owen, J., Teneyck, L.F., Grainger, C.T., Matthews, B.W.
      (1978) J Mol Biol 118: 81
    • Atomic Coordinates for T4 Phage Lysozyme
      Remington, S.J., Teneyck, L.F., Matthews, B.W.
      (1977) Biochem Biophys Res Commun 75: 265
    • Comparison of the Predicted and Observed Secondary Structure of T4 Phage Lysozyme
      Matthews, B.W.
      (1975) Biochim Biophys Acta 405: 442
    • The Three Dimensional Structure of the Lysozyme from Bacteriophage T4
      Matthews, B.W., Remington, S.J.
      (1974) Proc Natl Acad Sci U S A 71: 4178
    • Crystallographic Data for Lysozyme from Bacteriophage T4
      Matthews, B.W., Dahlquist, F.W., Maynard, A.Y.
      (1973) J Mol Biol 78: 575

    Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene 97403.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T4 LYSOZYMEA164Escherichia virus T4Mutation(s): 0 
Gene Names: E
EC: 3.2.1.17
UniProt
Find proteins for P00720 (Enterobacteria phage T4)
Explore P00720 
Go to UniProtKB:  P00720
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Observed: 0.173 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.2α = 90
b = 61.2β = 90
c = 96.8γ = 120
Software Package:
Software NamePurpose
TNTrefinement
AGROVATA / ROTAVATAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1988-04-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2020-07-22
    Changes: Data collection, Database references, Other, Refinement description