3INY

Crystal structure of human purine nucleoside phosphorylase in complex with 7-deazaguanine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure and molecular dynamics studies of human purine nucleoside phosphorylase complexed with 7-deazaguanine.

Caceres, R.A.Timmers, L.F.Pauli, I.Gava, L.M.Ducati, R.G.Basso, L.A.Santos, D.S.de Azevedo, W.F.

(2010) J.Struct.Biol. 169: 379-388

  • DOI: 10.1016/j.jsb.2009.11.010

  • PubMed Abstract: 
  • In humans, purine nucleoside phosphorylase (HsPNP) is responsible for degradation of deoxyguanosine, and genetic deficiency of this enzyme leads to profound T-cell mediated immunosuppression. HsPNP is a target for inhibitor development aiming at T-ce ...

    In humans, purine nucleoside phosphorylase (HsPNP) is responsible for degradation of deoxyguanosine, and genetic deficiency of this enzyme leads to profound T-cell mediated immunosuppression. HsPNP is a target for inhibitor development aiming at T-cell immune response modulation. Here we report the crystal structure of HsPNP in complex with 7-deazaguanine (HsPNP:7DG) at 2.75 A. Molecular dynamics simulations were employed to assess the structural features of HsPNP in both free form and in complex with 7DG. Our results show that some regions, responsible for entrance and exit of substrate, present a conformational variability, which is dissected by dynamics simulation analysis. Enzymatic assays were also carried out and revealed that 7-deazaguanine presents a lower inhibitory activity against HsPNP (K(i)=200 microM). The present structure may be employed in both structure-based design of PNP inhibitors and in development of specific empirical scoring functions.


    Organizational Affiliation

    Faculdade de Biociências, Instituto Nacional de Ciência e Tecnologia em Tuberculose-CNPq, Laboratório de Bioquímica Estrutural, Pontifícia Universidade Católica do Rio Grande do Sul, PUCRS, Porto Alegre, RS, Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Purine nucleoside phosphorylase
A
289Homo sapiensMutation(s): 0 
Gene Names: PNP (NP)
EC: 2.4.2.1
Find proteins for P00491 (Homo sapiens)
Go to Gene View: PNP
Go to UniProtKB:  P00491
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
7DG
Query on 7DG

Download SDF File 
Download CCD File 
A
7-DEAZAGUANINE
C6 H6 N4 O
LOSIULRWFAEMFL-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
7DGKd: 217000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.209 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 138.748α = 90.00
b = 138.748β = 90.00
c = 159.366γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
MOSFLMdata reduction
HKL-2000data collection
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance