1INO

RECOMBINANT INORGANIC PYROPHOSPHATASE FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Observed: 0.160 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mg2+ activation of Escherichia coli inorganic pyrophosphatase.

Avaeva, S.M.Rodina, E.V.Kurilova, S.A.Nazarova, T.I.Vorobyeva, N.N.Harutyunyan, E.H.VYu, Oganessyan

(1995) FEBS Lett 377: 44-46

  • DOI: 10.1016/0014-5793(95)01310-5
  • Primary Citation of Related Structures:  
    1INO

  • PubMed Abstract: 
  • Further refinement of X-ray data on Escherichia coli inorganic pyrophosphatase [Oganessyan et al. (1994) FEBS Lett. 348, 301-304] to 2.2 A reveals a system of noncovalent interactions involving Tyr55 and Tyr141 in the active site. The pKa for one of the eight Tyr residues in wild-type pyrophosphatase is as low as 9 ...

    Further refinement of X-ray data on Escherichia coli inorganic pyrophosphatase [Oganessyan et al. (1994) FEBS Lett. 348, 301-304] to 2.2 A reveals a system of noncovalent interactions involving Tyr55 and Tyr141 in the active site. The pKa for one of the eight Tyr residues in wild-type pyrophosphatase is as low as 9.1 and further decreases to 8.1 upon Mg2+ binding, generating characteristic changes in the absorption spectrum. These effects are lost in a Y55F but not in a Y141F variant. It is suggested that the lower-affinity site for Mg2+ in the enzyme is formed by Tyr55 and Asp70, which are in close proximity in the apo-enzyme structure.


    Organizational Affiliation

    A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Russian Federation.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INORGANIC PYROPHOSPHATASE A175Escherichia coliMutation(s): 0 
EC: 3.6.1.1
Find proteins for P0A7A9 (Escherichia coli (strain K12))
Explore P0A7A9 
Go to UniProtKB:  P0A7A9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download Ideal Coordinates CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Observed: 0.160 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.4α = 90
b = 110.4β = 90
c = 76.8γ = 120
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-04-03
    Type: Initial release
  • Version 1.1: 2008-03-04
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance