4TTI

Crystal structure of double mutant E. Coli purine nucleoside phosphorylase with 4 FMC molecules


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystallographic snapshots of ligand binding to hexameric purine nucleoside phosphorylase and kinetic studies give insight into the mechanism of catalysis.

Stefanic, Z.Narczyk, M.Mikleusevic, G.Kazazic, S.Bzowska, A.Luic, M.

(2018) Sci Rep 8: 15427-15427

  • DOI: 10.1038/s41598-018-33723-1
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Purine nucleoside phosphorylase (PNP) catalyses the cleavage of the glycosidic bond of purine nucleosides using phosphate instead of water as a second substrate. PNP from Escherichia coli is a homohexamer, build as a trimer of dimers, and each subuni ...

    Purine nucleoside phosphorylase (PNP) catalyses the cleavage of the glycosidic bond of purine nucleosides using phosphate instead of water as a second substrate. PNP from Escherichia coli is a homohexamer, build as a trimer of dimers, and each subunit can be in two conformations, open or closed. This conformational change is induced by the presence of phosphate substrate, and very likely a required step for the catalysis. Closing one active site strongly affects the others, by a yet unclear mechanism and order of events. Kinetic and ligand binding studies show strong negative cooperativity between subunits. Here, for the first time, we managed to monitor the sequence of nucleoside binding to individual subunits in the crystal structures of the wild-type enzyme, showing that first the closed sites, not the open ones, are occupied by the nucleoside. However, two mutations within the active site, Asp204Ala/Arg217Ala, are enough not only to significantly reduce the effectiveness of the enzyme, but also reverse the sequence of the nucleoside binding. In the mutant the open sites, neighbours in a dimer of those in the closed conformation, are occupied as first. This demonstrates how important for the effective catalysis of Escherichia coli PNP is proper subunit cooperation.


    Organizational Affiliation

    Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb, 10000, Croatia. marija.luic@irb.hr.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Purine nucleoside phosphorylase DeoD-type
A, B, C, D, E, F
237Escherichia coliMutation(s): 2 
Gene Names: deoDpupb4384JW4347
EC: 2.4.2.1
Find proteins for P0ABP8 (Escherichia coli (strain K12))
Go to UniProtKB:  P0ABP8
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMC
Query on FMC

Download CCD File 
A, C, D, F
(1S)-1-(7-amino-1H-pyrazolo[4,3-d]pyrimidin-3-yl)-1,4-anhydro-D-ribitol
C10 H13 N5 O4
KBHMEHLJSZMEMI-KSYZLYKTSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
C, D, E, F
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
PO4
Query on PO4

Download CCD File 
A, B, C, D, E, F
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.933α = 90
b = 124.174β = 90
c = 189.436γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-08
    Type: Initial release
  • Version 1.1: 2016-03-16
    Changes: Database references, Structure summary
  • Version 1.2: 2018-10-31
    Changes: Advisory, Data collection, Database references
  • Version 1.3: 2018-11-14
    Changes: Data collection, Database references, Source and taxonomy, Structure summary