1HEP

STRUCTURAL AND THERMODYNAMIC ANALYSIS OF COMPENSATING MUTATIONS WITHIN THE CORE OF CHICKEN EGG WHITE LYSOZYME


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Observed: 0.153 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural and thermodynamic analysis of compensating mutations within the core of chicken egg white lysozyme.

Wilson, K.P.Malcolm, B.A.Matthews, B.W.

(1992) J Biol Chem 267: 10842-10849

  • Primary Citation of Related Structures:  
    1HEM, 1HEL, 1HER, 1HEQ, 1HEP, 1HEO, 1HEN

  • PubMed Abstract: 
  • High resolution crystal structures have been determined for six chicken-type lysozymes that were constructed to investigate putative intermediates in the evolution of the lysozymes of modern game birds (Malcolm, B. A., Wilson, K. P., Matthews, B. W., ...

    High resolution crystal structures have been determined for six chicken-type lysozymes that were constructed to investigate putative intermediates in the evolution of the lysozymes of modern game birds (Malcolm, B. A., Wilson, K. P., Matthews, B. W., Kirsch, J. F., and Wilson, A. C. (1990) Nature 345, 86-89). The amino acid replacements include Thr-40----Ser, Ile-55----Val, and Ser-91----Thr, as well as combinations of these substitutions. Residues 40, 55, and 91 are buried within the core of chicken lysozyme. The replacements therefore involve the insertion and/or removal of methyl groups from the protein interior. The mutant proteins have normal activities, and their thermal stabilities span a range of 7 degrees C, with some variants more stable and some less stable than the naturally occurring forms. Comparison of the crystal structures shows the overall structures to be very similar, but there are differences in the packing of side chains in the region of the replacements. The x-ray coordinates were used to evaluate the repacking of side chains in the protein interior and to attempt to evaluate the contributions of the different energetic interactions toward the overall stability of each variant. The results illustrate how proteins can compensate for potentially destabilizing substitutions in different ways and underscore the importance of high resolution structural data if changes in protein thermostability due to changes in protein sequence are to be understood. The findings also suggest that protein stability can be increased by mutations that lower strain in the protein interior while maintaining total buried hydrophobic surface area.


    Related Citations: 
    • Ancestral Lysozymes Reconstructed, Neutrality Tested, and Thermostability Linked to Hydrocarbon Packing
      Malcolm, B.A., Wilson, K.P., Matthews, B.W., Kirsch, J.F., Wilson, A.C.
      (1990) Nature 344: 86

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEN EGG WHITE LYSOZYMEA129Gallus gallusMutation(s): 0 
Gene Names: LYZ
EC: 3.2.1.17
Find proteins for P00698 (Gallus gallus)
Explore P00698 
Go to UniProtKB:  P00698
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Observed: 0.153 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.1α = 90
b = 79.1β = 90
c = 37.4γ = 90
Software Package:
Software NamePurpose
TNTrefinement
AGROVATA / ROTAVATAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • 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: 2020-07-22
    Changes: Data collection, Database references, Other, Refinement description