5OGW

Cryo-EM structure of jasplakinolide-stabilized malaria parasite F-actin at near-atomic resolution


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Near-atomic structure of jasplakinolide-stabilized malaria parasite F-actin reveals the structural basis of filament instability.

Pospich, S.Kumpula, E.P.von der Ecken, J.Vahokoski, J.Kursula, I.Raunser, S.

(2017) Proc Natl Acad Sci U S A 114: 10636-10641

  • DOI: 10.1073/pnas.1707506114
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • During their life cycle, apicomplexan parasites, such as the malaria parasite Plasmodium falciparum , use actomyosin-driven gliding motility to move and invade host cells. For this process, actin filament length and stability are temporally a ...

    During their life cycle, apicomplexan parasites, such as the malaria parasite Plasmodium falciparum , use actomyosin-driven gliding motility to move and invade host cells. For this process, actin filament length and stability are temporally and spatially controlled. In contrast to canonical actin, P. falciparum actin 1 ( Pf Act1) does not readily polymerize into long, stable filaments. The structural basis of filament instability, which plays a pivotal role in host cell invasion, and thus infectivity, is poorly understood, largely because high-resolution structures of Pf Act1 filaments were missing. Here, we report the near-atomic structure of jasplakinolide (JAS)-stabilized Pf Act1 filaments determined by electron cryomicroscopy. The general filament architecture is similar to that of mammalian F-actin. The high resolution of the structure allowed us to identify small but important differences at inter- and intrastrand contact sites, explaining the inherent instability of apicomplexan actin filaments. JAS binds at regular intervals inside the filament to three adjacent actin subunits, reinforcing filament stability by hydrophobic interactions. Our study reveals the high-resolution structure of a small molecule bound to F-actin, highlighting the potential of electron cryomicroscopy for structure-based drug design. Furthermore, our work serves as a strong foundation for understanding the structural design and evolution of actin filaments and their function in motility and host cell invasion of apicomplexan parasites.


    Organizational Affiliation

    Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany; inari.kursula@uib.no stefan.raunser@mpi-dortmund.mpg.de.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin-1A, B, C, D, E378Plasmodium falciparum HB3Mutation(s): 0 
Find proteins for P86287 (Plasmodium falciparum (isolate HB3))
Explore P86287 
Go to UniProtKB:  P86287
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
9UE
Query on 9UE

Download CCD File 
A, C, E
Jasplakinolide
C36 H45 Br N4 O6
GQWYWHOHRVVHAP-DHKPLNAMSA-N
 Ligand Interaction
ADP
Query on ADP

Download CCD File 
A, B, C, D, E
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B, C, D, E
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Max Planck SocietyGermany--
European Union615984
Academy of FinlandFinland257537, 265112, 292718
Emil Aaltonen, Sigrid Juselius, and Jane and Aatos Erkko foundations--

Revision History 

  • Version 1.0: 2017-09-27
    Type: Initial release
  • Version 1.1: 2017-11-08
    Changes: Data processing, Database references
  • Version 1.2: 2018-10-17
    Changes: Data collection, Refinement description
  • Version 1.3: 2019-10-23
    Changes: Data collection, Other