1N9K

Crystal structure of the bromide adduct of AphA class B acid phosphatase/phosphotransferase from E. coli at 2.2 A resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

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This is version 1.3 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 to 1 ...

    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 phosphatase A, B212Escherichia 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.499α = 90
b = 92.616β = 90
c = 138.247γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
RESOLVEmodel building
REFMACrefinement
RESOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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
  • Version 1.3: 2017-10-11
    Changes: Refinement description