4U5A

Sporozoite Protein for Cell Traversal


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.245 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the Essential Plasmodium Host Cell Traversal Protein SPECT1.

Hamaoka, B.Y.Ghosh, P.

(2014) PLoS One 9: e114685-e114685

  • DOI: 10.1371/journal.pone.0114685
  • Primary Citation of Related Structures:  
    4U5A

  • PubMed Abstract: 
  • Host cell traversal by Plasmodium, the protozoan cause of malaria, is an essential part of this parasite's virulence. In this process, the parasite enters a host cell through a parasite-induced pore, traverses the host cell, and then exits the host cell. Two P ...

    Host cell traversal by Plasmodium, the protozoan cause of malaria, is an essential part of this parasite's virulence. In this process, the parasite enters a host cell through a parasite-induced pore, traverses the host cell, and then exits the host cell. Two P. berghei proteins, SPECT1 and SPECT2, are required for host cell traversal by the sporozoite form of the parasite. In the absence of either, no pore formation is observed. While SPECT2 has sequence homology to pore-forming proteins, SPECT1 has no homology to proteins of known structure or function. Here we present the 2.75 Å resolution structure of a slightly truncated version of P. berghei SPECT1. The structure reveals that the protein forms a four-helix bundle, with the rare feature of having all of these helices in parallel or antiparallel alignment. Also notable is the presence of a large, conserved, hydrophobic internal cavity in the protein, which may constitute a ligand-binding site or be indicative of partial instability in SPECT1, or both. The structure of SPECT1 will make possible targeted mutagenesis experiments aimed at understanding its mechanism of action in host cell traversal.


    Organizational Affiliation

    Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California, United States of America.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sporozoite microneme protein essential for cell traversalA, B, C, D201Plasmodium bergheiMutation(s): 0 
Gene Names: spectSPECT1PBK173_000417000PBNK65E_000406300PBNK65NY_000405700PBSP11A_000406200PBSP11RLL_000406400
UniProt
Find proteins for Q75UY1 (Plasmodium berghei)
Explore Q75UY1 
Go to UniProtKB:  Q75UY1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ75UY1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.179α = 90
b = 64.316β = 90
c = 233.748γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
Cootmodel building
SOLVEphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2014-07-25 
  • Released Date: 2014-12-24 
  • Deposition Author(s): Hamaoka, B.Y.

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-24
    Type: Initial release
  • Version 1.1: 2015-02-04
    Changes: Derived calculations
  • Version 1.2: 2016-06-01
    Changes: Data collection
  • Version 1.3: 2017-11-22
    Changes: Derived calculations, Refinement description