Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: mass spectrometry, microscopy

Macromolecule Content

• Total Structure Weight: 444.93 kDa 
• Atom Count: 19870 
• Residue Count: 2376 
• Unique protein chains: 3

7KIY

Plasmodium falciparum RhopH complex in soluble form

• DOI: 10.2210/pdb7KIY/pdb
• EMDataResource: EMD-22890

• Classification: MEMBRANE PROTEIN
• Organism(s): Plasmodium falciparum
• Mutation(s): No 


• Deposited: 2020-10-25 Released: 2021-01-13 
• Deposition Author(s): Schureck, M.A., Darling, J.E., Merk, A., Subramaniam, S., Desai, S.A.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.92 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Malaria parasites use a soluble RhopH complex for erythrocyte invasion and an integral form for nutrient uptake.

Schureck, M.A., Darling, J.E., Merk, A., Shao, J., Daggupati, G., Srinivasan, P., Olinares, P.D.B., Rout, M.P., Chait, B.T., Wollenberg, K., Subramaniam, S., Desai, S.A.

(2021) Elife 10

• PubMed: 33393463 
• DOI: 10.7554/eLife.65282
• Primary Citation of Related Structures:  
  7KIY


• PubMed Abstract: 
  

Malaria parasites use the RhopH complex for erythrocyte invasion and channel-mediated nutrient uptake. As the member proteins are unique to Plasmodium spp., how they interact and traffic through subcellular sites to serve these essential functions is unknown. We show that RhopH is synthesized as a soluble complex of CLAG3, RhopH2, and RhopH3 with 1:1:1 stoichiometry. After transfer to a new host cell, the complex crosses a vacuolar membrane surrounding the intracellular parasite and becomes integral to the erythrocyte membrane through a PTEX translocon-dependent process. We present a 2.9 Å single-particle cryo-electron microscopy structure of the trafficking complex, revealing that CLAG3 interacts with the other subunits over large surface areas. This soluble complex is tightly assembled with extensive disulfide bonding and predicted transmembrane helices shielded. We propose a large protein complex stabilized for trafficking but poised for host membrane insertion through large-scale rearrangements, paralleling smaller two-state pore-forming proteins in other organisms.

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Organizational Affiliation: 

Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cytoadherence linked asexual protein 3	A	1505	Plasmodium falciparum	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
High molecular weight rhoptry protein-2	B	1378	Plasmodium falciparum	Mutation(s): 0  Gene Names: rhoph2
Find proteins for Q8I060 (Plasmodium falciparum) Explore Q8I060  Go to UniProtKB:  Q8I060

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
High molecular weight rhoptry protein 3	C	897	Plasmodium falciparum	Mutation(s): 0
Find proteins for A0A024X9S2 (Plasmodium falciparum (isolate Camp / Malaysia)) Explore A0A024X9S2  Go to UniProtKB:  A0A024X9S2

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.92 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2020-10-25 
• Released Date: 2021-01-13 
Deposition Author(s): Schureck, M.A., Darling, J.E., Merk, A., Subramaniam, S., Desai, S.A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	--

Revision History 

• Version 1.0: 2021-01-13
  Type: Initial release