1ZN8

Human Adenine Phosphoribosyltransferase Complexed with AMP, in Space Group P1 at 1.76 A Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Complexes of Human Adenine Phosphoribosyltransferase Reveal Novel Features of the APRT Catalytic Mechanism

Silva, C.H.Silva, M.Iulek, J.Thiemann, O.H.

(2008) J.Biomol.Struct.Dyn. 25: 589-598

  • DOI: 10.1080/07391102.2008.10507205
  • Primary Citation of Related Structures:  1ZN7, 1ZN9

  • PubMed Abstract: 
  • Adenine phosphoribosyltransferase (APRT) is an important enzyme component of the purine recycling pathway. Parasitic protozoa of the order Kinetoplastida are unable to synthesize purines de novo and use the salvage pathway for the synthesis of purine ...

    Adenine phosphoribosyltransferase (APRT) is an important enzyme component of the purine recycling pathway. Parasitic protozoa of the order Kinetoplastida are unable to synthesize purines de novo and use the salvage pathway for the synthesis of purine bases rendering this biosynthetic pathway an attractive target for antiparasitic drug design. The recombinant human adenine phosphoribosyltransferase (hAPRT) structure was resolved in the presence of AMP in the active site to 1.76 A resolution and with the substrates PRPP and adenine simultaneously bound to the catalytic site to 1.83 A resolution. An additional structure was solved containing one subunit of the dimer in the apo-form to 2.10 A resolution. Comparisons of these three hAPRT structures with other 'type I' PRTases revealed several important features of this class of enzymes. Our data indicate that the flexible loop structure adopts an open conformation before and after binding of both substrates adenine and PRPP. Comparative analyses presented here provide structural evidence to propose the role of Glu104 as the residue that abstracts the proton of adenine N9 atom before its nucleophilic attack on the PRPP anomeric carbon. This work leads to new insights to the understanding of the APRT catalytic mechanism.


    Organizational Affiliation

    Departamento de Física e Informática, Grupo de Cristalografia de Proteínas e Biologia Estrutural, Instituto de Física de São Carlos, USP, Caixa Postal 369, 13560-590, São Carlos-SP, Brazil. tomich@fcfrp.usp.br




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adenine phosphoribosyltransferase
A, B
180Homo sapiensGene Names: APRT
EC: 2.4.2.7
Find proteins for P07741 (Homo sapiens)
Go to Gene View: APRT
Go to UniProtKB:  P07741
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
AMP
Query on AMP

Download SDF File 
Download CCD File 
A, B
ADENOSINE MONOPHOSPHATE
C10 H14 N5 O7 P
UDMBCSSLTHHNCD-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.157 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 47.060α = 75.41
b = 47.470β = 68.42
c = 47.840γ = 61.49
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-04-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance