1CX6

T4 LYSOZYME SUBSTITUTED WITH SELENOMETHIONINE


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


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

  • 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 ...

    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: 
    • Structure of Bacteriophage T4 Lysozyme Refined at 1.7 A Resolution
      Weaver, L.H.,Matthews, B.W.
      (1987) J.Mol.Biol. 193: 189
    • 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.USA 93: 12155


    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LYSOZYME
A
164Enterobacteria phage T4Mutations: F153M, L84M, L133M, C97A, C54T, L118M, L121M, L91M, L99M
Gene Names: E
EC: 3.2.1.17
Find proteins for P00720 (Enterobacteria phage T4)
Go to UniProtKB:  P00720
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
HED
Query on HED

Download SDF File 
Download CCD File 
A
2-HYDROXYETHYL DISULFIDE
C4 H10 O2 S2
KYNFOMQIXZUKRK-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Work: 0.158 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 61.400α = 90.00
b = 61.400β = 90.00
c = 96.700γ = 120.00
Software Package:
Software NamePurpose
TNTrefinement
TNTphasing
AUTOSTRATdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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