4IRF

Preliminary structural investigations of a malarial protein secretion system


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural mapping of the ClpB ATPases of Plasmodium falciparum: Targeting protein folding and secretion for antimalarial drug design.

AhYoung, A.P.Koehl, A.Cascio, D.Egea, P.F.

(2015) Protein Sci. 24: 1508-1520

  • DOI: 10.1002/pro.2739
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Caseinolytic chaperones and proteases (Clp) belong to the AAA+ protein superfamily and are part of the protein quality control machinery in cells. The eukaryotic parasite Plasmodium falciparum, the causative agent of malaria, has evolved an elaborate ...

    Caseinolytic chaperones and proteases (Clp) belong to the AAA+ protein superfamily and are part of the protein quality control machinery in cells. The eukaryotic parasite Plasmodium falciparum, the causative agent of malaria, has evolved an elaborate network of Clp proteins including two distinct ClpB ATPases. ClpB1 and ClpB2 are involved in different aspects of parasitic proteostasis. ClpB1 is present in the apicoplast, a parasite-specific and plastid-like organelle hosting various metabolic pathways necessary for parasite growth. ClpB2 localizes to the parasitophorous vacuole membrane where it drives protein export as core subunit of a parasite-derived protein secretion complex, the Plasmodium Translocon of Exported proteins (PTEX); this process is central to parasite virulence and survival in the human host. The functional associations of these two chaperones with parasite-specific metabolism and protein secretion make them prime drug targets. ClpB proteins function as unfoldases and disaggregases and share a common architecture consisting of four domains-a variable N-terminal domain that binds different protein substrates, followed by two highly conserved catalytic ATPase domains, and a C-terminal domain. Here, we report and compare the first crystal structures of the N terminal domains of ClpB1 and ClpB2 from Plasmodium and analyze their molecular surfaces. Solution scattering analysis of the N domain of ClpB2 shows that the average solution conformation is similar to the crystalline structure. These structures represent the first step towards the characterization of these two malarial chaperones and the reconstitution of the entire PTEX to aid structure-based design of novel anti-malarial drugs.


    Organizational Affiliation

    Molecular Biology Institute, UCLA, Los Angeles, California.,Department of Energy Institute for Genomics and Proteomics, UCLA, Los Angeles, California.,Department of Biological Chemistry, David Geffen School of Medicine, UCLA, Los Angeles, California.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MALARIAL CLPB2 ATPASE/HSP101 PROTEIN
A, B
156Plasmodium falciparum (isolate 3D7)Mutation(s): 0 
Find proteins for Q8IIJ8 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q8IIJ8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.214 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 31.780α = 90.00
b = 92.080β = 90.00
c = 96.980γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-01-14 
  • Released Date: 2014-04-16 
  • Deposition Author(s): Egea, P.F.

Revision History 

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2015-07-29
    Type: Database references
  • Version 1.2: 2015-12-16
    Type: Database references