6DUE | pdb_00006due

Toxoplasma gondii MyoA, a Class-XIV myosin, in the pre-powerstroke state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 
    0.261 (Depositor), 0.260 (DCC) 
  • R-Value Work: 
    0.220 (Depositor), 0.220 (DCC) 
  • R-Value Observed: 
    0.222 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

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This is version 1.3 of the entry. See complete history


Literature

Structural and mechanistic insights into the function of the unconventional class XIV myosin MyoA fromToxoplasma gondii.

Powell, C.J.Ramaswamy, R.Kelsen, A.Hamelin, D.J.Warshaw, D.M.Bosch, J.Burke, J.E.Ward, G.E.Boulanger, M.J.

(2018) Proc Natl Acad Sci U S A 115: E10548-E10555

  • DOI: https://doi.org/10.1073/pnas.1811167115
  • Primary Citation of Related Structures:  
    6DUE

  • PubMed Abstract: 

    Parasites of the phylum Apicomplexa are responsible for significant morbidity and mortality on a global scale. Central to the virulence of these pathogens are the phylum-specific, unconventional class XIV myosins that power the essential processes of parasite motility and host cell invasion. Notably, class XIV myosins differ from human myosins in key functional regions, yet they are capable of fast movement along actin filaments with kinetics rivaling previously studied myosins. Toward establishing a detailed molecular mechanism of class XIV motility, we determined the 2.6-Å resolution crystal structure of the Toxoplasma gondii MyoA (TgMyoA) motor domain. Structural analysis reveals intriguing strategies for force transduction and chemomechanical coupling that rely on a divergent SH1/SH2 region, the class-defining "HYAG"-site polymorphism, and the actin-binding surface. In vitro motility assays and hydrogen-deuterium exchange coupled with MS further reveal the mechanistic underpinnings of phosphorylation-dependent modulation of TgMyoA motility whereby localized regions of increased stability and order correlate with enhanced motility. Analysis of solvent-accessible pockets reveals striking differences between apicomplexan class XIV and human myosins. Extending these analyses to high-confidence homology models of Plasmodium and Cryptosporidium MyoA motor domains supports the intriguing potential of designing class-specific, yet broadly active, apicomplexan myosin inhibitors. The successful expression of the functional TgMyoA complex combined with our crystal structure of the motor domain provides a strong foundation in support of detailed structure-function studies and enables the development of small-molecule inhibitors targeting these devastating global pathogens.


  • Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC V8P 5C2, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin A787Toxoplasma gondii GT1Mutation(s): 0 
Gene Names: TGGT1_235470
UniProt
Find proteins for S7W634 (Toxoplasma gondii (strain ATCC 50853 / GT1))
Explore S7W634 
Go to UniProtKB:  S7W634
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupS7W634
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download Ideal Coordinates CCD File 
B [auth A]ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
ALF
Query on ALF

Download Ideal Coordinates CCD File 
C [auth A]TETRAFLUOROALUMINATE ION
Al F4
UYOMQIYKOOHAMK-UHFFFAOYSA-J
GOL
Query on GOL

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
D [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free:  0.261 (Depositor), 0.260 (DCC) 
  • R-Value Work:  0.220 (Depositor), 0.220 (DCC) 
  • R-Value Observed: 0.222 (Depositor) 
Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.25α = 90
b = 96.23β = 110.98
c = 92.05γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted ADPClick on this verticalbar to view details

Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada148596

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-31
    Type: Initial release
  • Version 1.1: 2018-11-21
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description