1CX6

T4 LYSOZYME SUBSTITUTED WITH SELENOMETHIONINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Work: 0.158 
  • R-Value Observed: 0.158 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Substitution with selenomethionine can enhance the stability of methionine-rich proteins.

Gassner, N.C.Baase, W.A.Hausrath, A.C.Matthews, B.W.

(1999) J Mol Biol 294: 17-20

  • DOI: 10.1006/jmbi.1999.3220
  • Primary Citation of Related Structures:  
    1CX6

  • PubMed Abstract: 
  • The availability of a series of phage T4 lysozymes with up to 14 methionine residues incorporated within the protein has made it possible to systematically compare the effect on protein stability of selenomethionine relative to methionine. Wild-type lysozyme contains two fully buried methionine residues plus three more on the surface ...

    The availability of a series of phage T4 lysozymes with up to 14 methionine residues incorporated within the protein has made it possible to systematically compare the effect on protein stability of selenomethionine relative to methionine. Wild-type lysozyme contains two fully buried methionine residues plus three more on the surface. The substitution of these methionine residues with selenomethionine slightly stabilizes the protein. As more and more methionine residues are substituted into the protein, there is a progressive loss of stability. This is, however, increasingly offset in the selenomethionine variants, ultimately resulting in a differential increase in melting temperature of about 7 degrees C. This increase, corresponding to about 0.25 kcal/mol per substitution, is in reasonable agreement with the difference in the solvent transfer free energy between the two amino acids.


    Related Citations: 
    • A Test of the "jigsaw-puzzle" Model for Protein Folding by Multiple Methionine Substitutions within the Core of T4 Lysozyme
      Gassner, N.C., Baase, W.A., Matthews, B.W.
      (1996) Proc Natl Acad Sci U S A 93: 12155
    • Structure of Bacteriophage T4 Lysozyme Refined at 1.7 A Resolution
      Weaver, L.H., Matthews, B.W.
      (1987) J Mol Biol 193: 189

    Organizational Affiliation

    Institute of Molecular Biology, Howard Hughes Medical Institute, Department of Physics, 1229 University of Oregon, Eugene, OR, 97403-1229, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LYSOZYMEA164Escherichia virus T4Mutation(s): 14 
Gene Names: GENE EE
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
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HED (Subject of Investigation/LOI)
Query on HED

Download Ideal Coordinates CCD File 
D [auth A]2-HYDROXYETHYL DISULFIDE
C4 H10 O2 S2
KYNFOMQIXZUKRK-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Work: 0.158 
  • R-Value Observed: 0.158 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.4α = 90
b = 61.4β = 90
c = 96.7γ = 120
Software Package:
Software NamePurpose
TNTrefinement
AUTOSTRATdata reduction
TNTphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-15
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Experimental preparation