2AUU

Inorganic pyrophosphatase complexed with magnesium pyrophosphate and fluoride


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.22 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.150 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Reversible inhibition of Escherichia coli inorganic pyrophosphatase by fluoride: trapped catalytic intermediates in cryo-crystallographic studies

Samygina, V.R.Moiseev, V.M.Rodina, E.V.Vorobyeva, N.N.Popov, A.N.Kurilova, S.A.Nazarova, T.I.Avaeva, S.M.Bartunik, H.D.

(2007) J Mol Biol 366: 1305-1317

  • DOI: https://doi.org/10.1016/j.jmb.2006.11.082
  • Primary Citation of Related Structures:  
    2AU6, 2AU7, 2AU8, 2AU9, 2AUU

  • PubMed Abstract: 

    Here, we describe high-resolution X-ray structures of Escherichia coli inorganic pyrophosphatase (E-PPase) complexed with the substrate, magnesium, or manganese pyrophosphate. The structures correspond to steps in the catalytic synthesis of enzyme-bound pyrophosphate (PP(i)) in the presence of fluoride as an inhibitor of hydrolysis. The catalytic reaction intermediates were trapped applying a new method that we developed for initiating hydrolytic activity in the E-PPase crystal. X-ray structures were obtained for three consecutive states of the enzyme in the course of hydrolysis. Comparative analysis of these structures showed that the Mn2+-supported hydrolysis of the phosphoanhydride bond is followed by a fast release of the leaving phosphate from the P1 site. The electrophilic phosphate P2 is trapped in the "down" conformation. Its movement into the "up" position most likely represents the rate-limiting step of Mn2+-supported hydrolysis. We further determined the crystal structure of the Arg43Gln mutant variant of E-PPase complexed with one phosphate and four Mn ions.


  • Organizational Affiliation

    A.V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky Pr. 59, 119333 Moscow, Russia. lera@ns.crys.ras.ru


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
inorganic pyrophosphatase175Escherichia coliMutation(s): 0 
EC: 3.6.1.1
UniProt
Find proteins for P0A7A9 (Escherichia coli (strain K12))
Explore P0A7A9 
Go to UniProtKB:  P0A7A9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7A9
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
POP
Query on POP

Download Ideal Coordinates CCD File 
K [auth A]PYROPHOSPHATE 2-
H2 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-L
CL
Query on CL

Download Ideal Coordinates CCD File 
H [auth A],
I [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A],
E [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
F
Query on F

Download Ideal Coordinates CCD File 
J [auth A]FLUORIDE ION
F
KRHYYFGTRYWZRS-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.22 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.150 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.363α = 90
b = 109.363β = 90
c = 75.165γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHELXLrefinement
SHELXL-97refinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2007-12-26
    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
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description