5GN7

Crystal structure of alternative oxidase from Trypanosoma brucei brucei complexed with cumarin derivative-17


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Discovery of trypanocidal coumarins with dual inhibition of both the glycerol kinase and alternative oxidase ofTrypanosoma brucei brucei.

Balogun, E.O.Inaoka, D.K.Shiba, T.Tsuge, C.May, B.Sato, T.Kido, Y.Nara, T.Aoki, T.Honma, T.Tanaka, A.Inoue, M.Matsuoka, S.Michels, P.A.M.Watanabe, Y.I.Moore, A.L.Harada, S.Kita, K.

(2019) FASEB J 33: 13002-13013

  • DOI: https://doi.org/10.1096/fj.201901342R
  • Primary Citation of Related Structures:  
    5GN5, 5GN6, 5GN7, 5GN9

  • PubMed Abstract: 

    African trypanosomiasis, sleeping sickness in humans or nagana in animals, is a potentially fatal neglected tropical disease and a threat to 65 million human lives and 100 million small and large livestock animals in sub-Saharan Africa. Available treatments for this devastating disease are few and have limited efficacy, prompting the search for new drug candidates. Simultaneous inhibition of the trypanosomal glycerol kinase (TGK) and trypanosomal alternative oxidase (TAO) is considered a validated strategy toward the development of new drugs. Our goal is to develop a TGK-specific inhibitor for coadministration with ascofuranone (AF), the most potent TAO inhibitor. Here, we report on the identification of novel compounds with inhibitory potency against TGK. Importantly, one of these compounds (compound 17) and its derivatives (17a and 17b) killed trypanosomes even in the absence of AF. Inhibition kinetics revealed that derivative 17b is a mixed-type and competitive inhibitor for TGK and TAO, respectively. Structural data revealed the molecular basis of this dual inhibitory action, which, in our opinion, will aid in the successful development of a promising drug to treat trypanosomiasis. Although the EC 50 of compound 17b against trypanosome cells was 1.77 µM, it had no effect on cultured human cells, even at 50 µM.-Balogun, E. O., Inaoka, D. K., Shiba, T., Tsuge, C., May, B., Sato, T., Kido, Y., Nara, T., Aoki, T., Honma, T., Tanaka, A., Inoue, M., Matsuoka, S., Michels, P. A. M., Watanabe, Y.-I., Moore, A. L., Harada, S., Kita, K. Discovery of trypanocidal coumarins with dual inhibition of both the glycerol kinase and alternative oxidase of Trypanosoma brucei brucei.


  • Organizational Affiliation

    Department of Biochemistry, Ahmadu Bello University, Zaria, Nigeria.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alternative oxidase, mitochondrial
A, B, C, D
329Trypanosoma brucei bruceiMutation(s): 0 
Gene Names: AOX
EC: 1
UniProt
Find proteins for Q26710 (Trypanosoma brucei brucei)
Explore Q26710 
Go to UniProtKB:  Q26710
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ26710
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6XZ
Query on 6XZ

Download Ideal Coordinates CCD File 
G [auth A]4-[[4-(4-methoxyphenyl)piperazin-1-yl]methyl]-7,8-bis(oxidanyl)chromen-2-one
C21 H22 N2 O5
NSCKGTDRMZINFP-UHFFFAOYSA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
H [auth B]
I [auth B]
K [auth C]
E [auth A],
F [auth A],
H [auth B],
I [auth B],
K [auth C],
L [auth C],
N [auth D],
O [auth D]
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
OH
Query on OH

Download Ideal Coordinates CCD File 
J [auth B],
M [auth C],
P [auth D]
HYDROXIDE ION
H O
XLYOFNOQVPJJNP-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.312α = 90
b = 222.726β = 114.7
c = 63.165γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japanese Society for the Promotion of ScienceJapan26253025

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-10-04
    Changes: Data collection
  • Version 1.2: 2019-12-11
    Changes: Database references
  • Version 1.3: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description