5'-Nucleotidase (E. coli) with an Engineered Disulfide Bridge (S228C, P513C)

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 

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Trapping a 96 Degree Domain Rotation in Two Distinct Conformations by Engineered Disulfide Bridges

Schultz-Heienbrok, R.Maier, T.Straeter, N.

(2004) Protein Sci 13: 1811

  • DOI: https://doi.org/10.1110/ps.04629604
  • Primary Citation of Related Structures:  
    1OI8, 1OID, 1OIE

  • PubMed Abstract: 

    Engineering disulfide bridges is a common technique to lock a protein movement in a defined conformational state. We have designed two double mutants of Escherichia coli 5'-nucleotidase to trap the enzyme in both an open (S228C, P513C) and a closed (P90C, L424C) conformation by the formation of disulfide bridges. The mutant proteins have been expressed, purified, and crystallized, to structurally characterize the designed variants. The S228C, P513C is a double mutant crystallized in two different crystal forms with three independent conformers, which differ from each other by a rotation of up to 12 degrees of the C-terminal domain with respect to the N-terminal domain. This finding, as well as an analysis of the domain motion in the crystal, indicates that the enzyme still exhibits considerable residual domain flexibility. In the double mutant that was designed to trap the enzyme in the closed conformation, the structure analysis reveals an unexpected intermediate conformation along the 96 degrees rotation trajectory between the open and closed enzyme forms. A comparison of the five independent conformers analyzed in this study shows that the domain movement of the variant enzymes is characterized by a sliding movement of the residues of the domain interface along the interface, which is in contrast to a classical closure motion where the residues of the domain interface move perpendicular to the interface.

  • Organizational Affiliation

    Biotechnologisch-Biomedizinisches Zentrum der Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
532Escherichia coliMutation(s): 2 
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for P07024 (Escherichia coli (strain K12))
Explore P07024 
Go to UniProtKB:  P07024
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07024
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NI

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.496α = 90
b = 93.708β = 97.71
c = 82.901γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description