8TRN

Actin 1 from T. gondii in filaments bound to MgADP and jasplakinolide


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Toxoplasma gondii actin filaments are tuned for rapid disassembly and turnover.

Hvorecny, K.L.Sladewski, T.E.De La Cruz, E.M.Kollman, J.M.Heaslip, A.T.

(2024) Nat Commun 15: 1840-1840

  • DOI: https://doi.org/10.1038/s41467-024-46111-3
  • Primary Citation of Related Structures:  
    8TRM, 8TRN

  • PubMed Abstract: 

    The cytoskeletal protein actin plays a critical role in the pathogenicity of the intracellular parasite, Toxoplasma gondii, mediating invasion and egress, cargo transport, and organelle inheritance. Advances in live cell imaging have revealed extensive filamentous actin networks in the Apicomplexan parasite, but there are conflicting data regarding the biochemical and biophysical properties of Toxoplasma actin. Here, we imaged the in vitro assembly of individual Toxoplasma actin filaments in real time, showing that native, unstabilized filaments grow tens of microns in length. Unlike skeletal muscle actin, Toxoplasma filaments intrinsically undergo rapid treadmilling due to a high critical concentration, fast monomer dissociation, and rapid nucleotide exchange. Cryo-EM structures of jasplakinolide-stabilized and native (i.e. unstabilized) filaments show an architecture like skeletal actin, with differences in assembly contacts in the D-loop that explain the dynamic nature of the filament, likely a conserved feature of Apicomplexan actin. This work demonstrates that evolutionary changes at assembly interfaces can tune the dynamic properties of actin filaments without disrupting their conserved structure.


  • Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, WA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Actin
A, B, C
376Toxoplasma gondiiMutation(s): 0 
Gene Names: ACT1
EC: 3.6.4
UniProt
Find proteins for P53476 (Toxoplasma gondii)
Explore P53476 
Go to UniProtKB:  P53476
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP53476
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
9UE (Subject of Investigation/LOI)
Query on 9UE

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
L [auth C]
Jasplakinolide
C36 H45 Br N4 O6
GQWYWHOHRVVHAP-DHKPLNAMSA-N
ADP (Subject of Investigation/LOI)
Query on ADP

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
K [auth C]
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG (Subject of Investigation/LOI)
Query on MG

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

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.20
RECONSTRUCTIONPHENIX1.20

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesF32AI145111
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM138316

Revision History  (Full details and data files)

  • Version 1.0: 2024-03-06
    Type: Initial release