189L

ENHANCEMENT OF PROTEIN STABILITY BY THE COMBINATION OF POINT MUTATIONS IN T4 LYSOZYME IS ADDITIVE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Enhancement of protein stability by the combination of point mutations in T4 lysozyme is additive.

Zhang, X.J.Baase, W.A.Shoichet, B.K.Wilson, K.P.Matthews, B.W.

(1995) Protein Eng 8: 1017-1022

  • DOI: 10.1093/protein/8.10.1017
  • Primary Citation of Related Structures:  
    189L

  • PubMed Abstract: 
  • A number of mutations have been shown previously to stabilize T4 lysozyme. By combining up to seven such mutations in the same protein, the melting temperature was incrementally increased by up to 8.3 degrees C at pH 5.4 (delta delta G = 3.6 kcal/mol). This shows that it is possible to engineer a protein of enhanced thermostability by combining a series of rationally designed point mutations ...

    A number of mutations have been shown previously to stabilize T4 lysozyme. By combining up to seven such mutations in the same protein, the melting temperature was incrementally increased by up to 8.3 degrees C at pH 5.4 (delta delta G = 3.6 kcal/mol). This shows that it is possible to engineer a protein of enhanced thermostability by combining a series of rationally designed point mutations. It is also shown that this stabilization is achieved with only minor, localized changes in the structure of the protein. This is consistent with the observation that the change in stability of each of the multiple mutants is, in each case, additive, i.e. equal to the sum of the stability changes associated with the constituent single mutants. One of the seven substitutions, Asn116-->Asp, changes a residue that participates in substrate binding; not surprisingly, it causes a significant loss in activity. Ignoring this mutation, there is a gradual reduction in activity as successively more mutations are combined.


    Related Citations: 
    • Structure of Bacteriophage T4 Lysozyme Refined at 1.7 Angstroms Resolution
      Weaver, L.H., Matthews, B.W.
      (1987) J Mol Biol 193: 189

    Organizational Affiliation

    Howard Hughes Medical Institute, University of Oregon, Eugene 97403, USA.



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
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.6α = 90
b = 56.8β = 90
c = 94.4γ = 90
Software Package:
Software NamePurpose
TNTrefinement
Xengen (HOWARD, NIELSEN, XUONG)data scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-07-31
    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: 2020-07-22
    Changes: Data collection, Database references, Other, Refinement description