4CMB

Crystal structure of pteridine reductase 1 (PTR1) from Trypanosoma brucei in ternary complex with cofactor and inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.175 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structure-Based Design and Synthesis of Antiparasitic Pyrrolopyrimidines Targeting Pteridine Reductase 1.

Khalaf, A.I.Huggan, J.K.Suckling, C.J.Gibson, C.L.Stewart, K.Giordani, F.Barrett, M.P.Wong, P.E.Barrack, K.L.Hunter, W.N.

(2014) J Med Chem 57: 6479

  • DOI: 10.1021/jm500483b
  • Primary Citation of Related Structures:  
    4CL8, 4CLD, 4CLE, 4CLH, 4CLO, 4CLR, 4CLX, 4CM1, 4CM3, 4CM4, 4CM5, 4CM6, 4CM7, 4CM8, 4CM9, 4CMA, 4CMB, 4CMC, 4CME, 4CMG, 4CMI, 4CMJ, 4CMK

  • PubMed Abstract: 
  • The treatment of Human African trypanosomiasis remains a major unmet health need in sub-Saharan Africa. Approaches involving new molecular targets are important; pteridine reductase 1 (PTR1), an enzyme that reduces dihydrobiopterin in Trypanosoma spp., has been identified as a candidate target, and it has been shown previously that substituted pyrrolo[2,3-d]pyrimidines are inhibitors of PTR1 from Trypanosoma brucei (J ...

    The treatment of Human African trypanosomiasis remains a major unmet health need in sub-Saharan Africa. Approaches involving new molecular targets are important; pteridine reductase 1 (PTR1), an enzyme that reduces dihydrobiopterin in Trypanosoma spp., has been identified as a candidate target, and it has been shown previously that substituted pyrrolo[2,3-d]pyrimidines are inhibitors of PTR1 from Trypanosoma brucei (J. Med. Chem. 2010, 53, 221-229). In this study, 61 new pyrrolo[2,3-d]pyrimidines have been prepared, designed with input from new crystal structures of 23 of these compounds complexed with PTR1, and evaluated in screens for enzyme inhibitory activity against PTR1 and in vitro antitrypanosomal activity. Eight compounds were sufficiently active in both screens to take forward to in vivo evaluation. Thus, although evidence for trypanocidal activity in a stage I disease model in mice was obtained, the compounds were too toxic to mice for further development.


    Organizational Affiliation

    WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde , 295 Cathedral Street, Glasgow G1 1XL, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PTERIDINE REDUCTASE 1A, B, C, D288Trypanosoma brucei bruceiMutation(s): 0 
Gene Names: PTR1
EC: 1.5.1.33
UniProt
Find proteins for O76290 (Trypanosoma brucei brucei)
Explore O76290 
Go to UniProtKB:  O76290
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO76290
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
J [auth C],
L [auth D]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
UEN
Query on UEN

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
K [auth C],
M [auth D]
N4-cyclohexyl-5-(4-fluorophenyl)-7H-pyrrolo[2,3-d]pyrimidine-2,4-diamine
C18 H20 F N5
QQJUCGSYNBAQMI-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
G [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
UEN Binding MOAD:  4CMB Ki: 560 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.06α = 90
b = 89.68β = 115.44
c = 84.35γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2017-07-05
    Changes: Data collection