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: 2.5 Å
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.4 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.USA 96: 6078-6083

  • Primary Citation of Related Structures:  262L
  • Also Cited By: 1T8A, 1T97, 2F2Q, 2F32, 2F47, 3JR6

  • 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 ta ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (LYSOZYME)
A
173Enterobacteria phage T4Gene Names: E
EC: 3.2.1.17
Find proteins for P00720 (Enterobacteria phage T4)
Go to UniProtKB:  P00720
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Work: 0.170 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 61.125α = 90.00
b = 61.125β = 90.00
c = 97.338γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
TNTphasing
TNTrefinement
REFMACrefinement
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-05-24
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-07-26
    Type: Source and taxonomy
  • Version 1.4: 2017-10-04
    Type: Refinement description