6E10

PTEX Core Complex in the Engaged (Extended) State

  • Classification: PROTEIN TRANSPORT
  • Organism(s): Plasmodium falciparum 3D7
  • Mutation(s): No 
  • Membrane Protein: Yes  OPMPDBTMmpstruc

  • Deposited: 2018-07-08 Released: 2018-08-22 
  • Deposition Author(s): Ho, C., Lai, M., Zhou, Z.H.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR), National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI), National Institutes of Health/National Center for Research Resources (NIH/NCRR), National Institutes of Health/Office of the Director, National Science Foundation (NSF, United States)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.16 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Malaria parasite translocon structure and mechanism of effector export.

Ho, C.M., Beck, J.R., Lai, M., Cui, Y., Goldberg, D.E., Egea, P.F., Zhou, Z.H.

(2018) Nature 561: 70-75

  • DOI: 10.1038/s41586-018-0469-4
  • Primary Citation of Related Structures:  
    6E10, 6E11

  • PubMed Abstract: 

    • The putative Plasmodium translocon of exported proteins (PTEX) is essential for transport of malarial effector proteins across a parasite-encasing vacuolar membrane into host erythrocytes, but the mechanism of this process remains unknown. Here we show that PTEX is a bona fide translocon by determining structures of the PTEX core complex at near-atomic resolution using cryo-electron microscopy ...

    The putative Plasmodium translocon of exported proteins (PTEX) is essential for transport of malarial effector proteins across a parasite-encasing vacuolar membrane into host erythrocytes, but the mechanism of this process remains unknown. Here we show that PTEX is a bona fide translocon by determining structures of the PTEX core complex at near-atomic resolution using cryo-electron microscopy. We isolated the endogenous PTEX core complex containing EXP2, PTEX150 and HSP101 from Plasmodium falciparum in the 'engaged' and 'resetting' states of endogenous cargo translocation using epitope tags inserted using the CRISPR-Cas9 system. In the structures, EXP2 and PTEX150 interdigitate to form a static, funnel-shaped pseudo-seven-fold-symmetric protein-conducting channel spanning the vacuolar membrane. The spiral-shaped AAA+ HSP101 hexamer is tethered above this funnel, and undergoes pronounced compaction that allows three of six tyrosine-bearing pore loops lining the HSP101 channel to dissociate from the cargo, resetting the translocon for the next threading cycle. Our work reveals the mechanism of P. falciparum effector export, and will inform structure-based design of drugs targeting this unique translocon.

    Organizational Affiliation: 

    California NanoSystems Institute, University of California, Los Angeles, CA, USA. hong.zhou@UCLA.edu.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Heat shock protein 101932Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PF3D7_1116800
Membrane Entity: Yes 
UniProt
Find proteins for Q8IIJ8 (Plasmodium falciparum (isolate 3D7))
Explore Q8IIJ8 
Go to UniProtKB:  Q8IIJ8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IIJ8
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Exported protein 2287Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PF3D7_1471100
Membrane Entity: Yes 
UniProt
Find proteins for Q8IKC8 (Plasmodium falciparum (isolate 3D7))
Explore Q8IKC8 
Go to UniProtKB:  Q8IKC8
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UniProt GroupQ8IKC8
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Translocon component PTEX150207Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PF3D7_1436300
Membrane Entity: Yes 
UniProt
Find proteins for Q8ILA1 (Plasmodium falciparum (isolate 3D7))
Explore Q8ILA1 
Go to UniProtKB:  Q8ILA1
Entity Groups  
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UniProt GroupQ8ILA1
Protein Feature View
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Endogenous cargo polypeptideU [auth 0]15Plasmodium falciparum 3D7Mutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Unknown (Claw)58Plasmodium falciparum 3D7Mutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.16 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION2.0
MODEL REFINEMENTPHENIX1.13

Structure Validation

View Full Validation Report



View more in-depth experimental data
Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM071940
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01 AI094386
National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR)United StatesR01 DE025567
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesK99/R00 HL133453
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesS10RR23057
National Institutes of Health/Office of the DirectorUnited StatesS10OD018111
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesU24GM116792
National Science Foundation (NSF, United States)United StatesDBI-1338135
National Science Foundation (NSF, United States)United StatesDMR-1548924
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesT32 AI007323
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR21 AI125983

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-22
    Type: Initial release
  • Version 1.1: 2018-09-12
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence