261L

STRUCTURAL CHARACTERISATION OF AN ENGINEERED TANDEM REPEAT CONTRASTS THE IMPORTANCE OF CONTEXT AND SEQUENCE IN PROTEIN FOLDING


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Work: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.7 of the entry. See complete history


Literature

Structural characterization of an engineered tandem repeat contrasts the importance of context and sequence in protein folding.

Sagermann, M.Baase, W.A.Matthews, B.W.

(1999) Proc Natl Acad Sci U S A 96: 6078-6083

  • Primary Citation of Related Structures:  
    261L, 262L

  • PubMed Abstract: 
  • To test a different approach to understanding the relationship between the sequence of part of a protein and its conformation in the overall folded structure, the amino acid sequence corresponding to an alpha-helix of T4 lysozyme was duplicated in tandem ...

    To test a different approach to understanding the relationship between the sequence of part of a protein and its conformation in the overall folded structure, the amino acid sequence corresponding to an alpha-helix of T4 lysozyme was duplicated in tandem. The presence of such a sequence repeat provides the protein with "choices" during folding. The mutant protein folds with almost wild-type stability, is active, and crystallizes in two different space groups, one isomorphous with wild type and the other with two molecules in the asymmetric unit. The fold of the mutant is essentially the same in all cases, showing that the inserted segment has a well-defined structure. More than half of the inserted residues are themselves helical and extend the helix present in the wild-type protein. Participation of additional duplicated residues in this helix would have required major disruption of the parent structure. The results clearly show that the residues within the duplicated sequence tend to maintain a helical conformation even though the packing interactions with the remainder of the protein are different from those of the original helix. It supports the hypothesis that the structures of individual alpha-helices are determined predominantly by the nature of the amino acids within the helix, rather than the structural environment provided by the rest of the protein.


    Related Citations: 
    • Protein Structural Plasticity Examplified by Insertion and Deletion
      Vetter, I.R., Baase, W.A., Heinz, D., Xiong, J.P., Snow, S., Matthews, B.W.
      (1998) Protein Sci 5: 2339
    • Folding and Function of a T4 Lysosyme Containing 10 Consecutive Alanines Illustrate the Redundancy of Information in an Amino Acid Sequence
      Heinz, D., Baase, W.A., Dahlquist, F.W., Matthews, B.W.
      (1993) Nature 361: 561

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LYSOZYMEA173Escherichia virus T4Mutation(s): 1 
Gene Names: GENE E FROM BACTERIOPHAGE T4
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: 2.50 Å
  • R-Value Work: 0.170 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.125α = 90
b = 61.125β = 90
c = 97.338γ = 120
Software Package:
Software NamePurpose
TNTrefinement
REFMACrefinement
MOSFLMdata reduction
XDSdata scaling
TNTphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-05-24
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-07-26
    Changes: Source and taxonomy
  • Version 1.4: 2017-10-04
    Changes: Refinement description
  • Version 1.5: 2018-03-14
    Changes: Database references
  • Version 1.6: 2018-12-19
    Changes: Data collection, Structure summary
  • Version 1.7: 2020-07-22
    Changes: Data collection, Database references, Other, Refinement description