8CDM

Plasmodium falciparum Myosin A full-length, post-rigor state complexed to the inhibitor KNX-002


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Mechanism of small molecule inhibition of Plasmodium falciparum myosin A informs antimalarial drug design.

Moussaoui, D.Robblee, J.P.Robert-Paganin, J.Auguin, D.Fisher, F.Fagnant, P.M.Macfarlane, J.E.Schaletzky, J.Wehri, E.Mueller-Dieckmann, C.Baum, J.Trybus, K.M.Houdusse, A.

(2023) Nat Commun 14: 3463-3463

  • DOI: https://doi.org/10.1038/s41467-023-38976-7
  • Primary Citation of Related Structures:  
    8A12, 8CDM, 8CDQ

  • PubMed Abstract: 

    Malaria results in more than 500,000 deaths per year and the causative Plasmodium parasites continue to develop resistance to all known agents, including different antimalarial combinations. The class XIV myosin motor PfMyoA is part of a core macromolecular complex called the glideosome, essential for Plasmodium parasite mobility and therefore an attractive drug target. Here, we characterize the interaction of a small molecule (KNX-002) with PfMyoA. KNX-002 inhibits PfMyoA ATPase activity in vitro and blocks asexual blood stage growth of merozoites, one of three motile Plasmodium life-cycle stages. Combining biochemical assays and X-ray crystallography, we demonstrate that KNX-002 inhibits PfMyoA using a previously undescribed binding mode, sequestering it in a post-rigor state detached from actin. KNX-002 binding prevents efficient ATP hydrolysis and priming of the lever arm, thus inhibiting motor activity. This small-molecule inhibitor of PfMyoA paves the way for the development of alternative antimalarial treatments.


  • Organizational Affiliation

    Structural Motility, Institut Curie, Université Paris Sciences et Lettres, Sorbonne Université, CNRS UMR144, 75248, Paris, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin-A818Plasmodium falciparumMutation(s): 0 
Gene Names: MyoAPF13_0233PF3D7_1342600
UniProt
Find proteins for Q8IDR3 (Plasmodium falciparum (isolate 3D7))
Explore Q8IDR3 
Go to UniProtKB:  Q8IDR3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IDR3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin A tail domain interacting protein204Plasmodium falciparumMutation(s): 0 
Gene Names: PF3D7_1246400
UniProt
Find proteins for Q8I4W8 (Plasmodium falciparum (isolate 3D7))
Explore Q8I4W8 
Go to UniProtKB:  Q8I4W8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8I4W8
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin essential light chain ELCC [auth E]134Plasmodium falciparumMutation(s): 0 
Gene Names: CK202_4702
UniProt
Find proteins for Q8IJM4 (Plasmodium falciparum (isolate 3D7))
Explore Q8IJM4 
Go to UniProtKB:  Q8IJM4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IJM4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.931α = 90
b = 114.409β = 90
c = 170.332γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01AI 132378

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-21
    Type: Initial release
  • Version 1.1: 2024-09-04
    Changes: Database references
  • Version 1.2: 2024-10-16
    Changes: Structure summary