1N8N

Crystal structure of the Au3+ complex of AphA class B acid phosphatase/phosphotransferase from E. coli at 1.69 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The first structure of a bacterial class B Acid phosphatase reveals further structural heterogeneity among phosphatases of the haloacid dehalogenase fold.

Calderone, V.Forleo, C.Benvenuti, M.Thaller, M.C.Rossolini, G.M.Mangani, S.

(2004) J Mol Biol 335: 761-773

  • DOI: 10.1016/j.jmb.2003.10.050
  • Primary Citation of Related Structures:  
    1N8N, 1N9K

  • PubMed Abstract: 
  • AphA is a periplasmic acid phosphatase of Escherichia coli belonging to class B bacterial phosphatases, which is part of the DDDD superfamily of phosphohydrolases. The crystal structure of AphA has been determined at 2.2A and its resolution extended ...

    AphA is a periplasmic acid phosphatase of Escherichia coli belonging to class B bacterial phosphatases, which is part of the DDDD superfamily of phosphohydrolases. The crystal structure of AphA has been determined at 2.2A and its resolution extended to 1.7A on an AuCl(3) derivative. This represents the first crystal structure of a class B bacterial phosphatase. Despite the lack of sequence homology, the AphA structure reveals a haloacid dehalogenase-like fold. This finding suggests that this fold could be conserved among members of the DDDD superfamily of phosphohydrolases. The active enzyme is a homotetramer built by using an extended N-terminal arm intertwining the four monomers. The active site of the native enzyme, as prepared, hosts a magnesium ion, which can be replaced by other metal ions. The structure explains the non-specific behaviour of AphA towards substrates, while a structure-based alignment with other phosphatases provides clues about the catalytic mechanism.


    Related Citations: 
    • Identification of the gene (aphA) encoding the class B acid phosphatase/phosphotransferase of Escherichia coli MG1655 and characterization of its product
      Thaller, M.C., Schippa, S., Bonci, A., Cresti, S., Rossolini, G.M.
      (1997) FEMS Microbiol Lett 146: 191

    Organizational Affiliation

    Dipartimento di Chimica, Università di Siena, Via Aldo Moro, I-53100 Siena, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Class B acid phosphataseA212Escherichia coliMutation(s): 0 
Gene Names: aphA
EC: 3.1.3.2
Find proteins for P0AE22 (Escherichia coli (strain K12))
Explore P0AE22 
Go to UniProtKB:  P0AE22
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AU3
Query on AU3

Download CCD File 
A
GOLD 3+ ION
Au
CBMIPXHVOVTTTL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.279α = 90
b = 92.457β = 90
c = 138.182γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
REFMACrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-02-03
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance