1UN2

Crystal structure of circularly permuted CPDSBA_Q100T99: Preserved Global Fold and Local Structural Adjustments


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.206 

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Literature

Structure of Circularly Permuted Dsba(Q100T99): Preserved Global Fold and Local Structural Adjustments

Manjasetty, B.A.Hennecke, J.Glockshuber, R.Heinemann, U.

(2004) Acta Crystallogr.,Sect.D 60: 304

  • DOI: 10.1107/S0907444903028695

  • PubMed Abstract: 
  • The thiol-disulfide oxidoreductase DsbA is required for efficient formation of disulfide bonds in the Escherichia coli periplasm. The enzyme is the strongest oxidant of the family of thioredoxin-like proteins and three-dimensional structures of both ...

    The thiol-disulfide oxidoreductase DsbA is required for efficient formation of disulfide bonds in the Escherichia coli periplasm. The enzyme is the strongest oxidant of the family of thioredoxin-like proteins and three-dimensional structures of both oxidized and reduced forms are known. DsbA consists of a catalytic thioredoxin-like domain and a helical domain that is inserted into the thioredoxin motif. Here, the X-ray structure of a circularly permuted variant, cpDsbA(Q100T99), is reported in which the natural termini are joined by the pentapeptide linker GGGTG, leading to a continuous thioredoxin domain, and new termini that have been introduced in the helical domain by breaking the peptide bond Thr99-Gln100. cpDsbA(Q100T99) is catalytically active in vivo and in vitro. The crystal structure of oxidized cpDsbA(Q100T99), determined by molecular replacement at 2.4 A resolution, was found to be very similar to that of wild-type DsbA. The lower thermodynamic stability of cpDsbA(Q100T99) relative to DsbA is associated with small structural changes within the molecule, especially near the new termini and the circularizing linker. The active-site helices and adjacent loops display increased flexibility compared with oxidized DsbA.


    Related Citations: 
    • Random Circular Permutaion of Dsba Reveals Segments that are Essential for Protein Folding and Stability
      Hennecke, J.,Sebbal, P.,Glockshuber, R.
      (1999) J.Mol.Biol. 286: 1197


    Organizational Affiliation

    Forschungsgruppe Kristallographie, Max-Delbrück-Centrum für Molekulare Medizin, D-13092 Berlin, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOL-DISULFIDE INTERCHANGE PROTEIN
A
197Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: dsbA (dsf, ppfA)
Find proteins for P0AEG4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEG4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 37.760α = 90.00
b = 52.590β = 103.23
c = 53.730γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
AMoREphasing
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-09-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance