Crystallographic snapshots of Aspergillus fumigatus phytase revealing its enzymatic dynamics

Experimental Data Snapshot

  • Resolution: 1.58 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 

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Crystallographic Snapshots of Aspergillus fumigatus Phytase, Revealing Its Enzymatic Dynamics

Liu, Q.Huang, Q.Lei, X.G.Hao, Q.

(2004) Structure 12: 1575-1583

  • DOI: https://doi.org/10.1016/j.str.2004.06.015
  • Primary Citation of Related Structures:  
    1SK8, 1SK9, 1SKA, 1SKB

  • PubMed Abstract: 

    Understanding of the atomic movements involved in an enzymatic reaction needs structural information on the active and inactive native enzyme molecules and on the enzyme-substrate, enzyme-intermediate, and enzyme-product(s) complexes. By using the X-ray crystallographic method, four crystal structures of Aspergillus fumigatus phytase were obtained at resolution higher than 1.7 A. The pH-dependent catalytic activity of A. fumigatus phytase was linked to three water molecules that may prevent the substrate from binding and thus block nucleophilic attack of the catalytic imidazole nitrogen. Comparison of various structures also identified the water molecule that attacks the phosphamide bond during the hydrolysis process, and established the hydrolysis pathway of the intermediate. Additionally, two reaction product phosphates were observed at the active site, suggesting a possible product release pathway after hydrolysis of the intermediate. These results can help explain the catalytic mechanism throughout the whole acid phosphatase family, as all key residues are conserved.

  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-phytase A439Aspergillus fumigatusMutation(s): 0 
Gene Names: PHYA
Find proteins for O00092 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore O00092 
Go to UniProtKB:  O00092
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00092
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.58 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.131α = 90
b = 70.131β = 90
c = 186.237γ = 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: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary