2MU6

3D structure determination of STARP peptides implicated in P. falciparum Invasion of hepatic cells


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

3D structure determination of STARP peptides implicated in P. falciparum invasion of hepatic cells.

Bermudez, A.Alba, M.P.Vanegas, M.Patarroyo, M.E.

(2010) Vaccine 28: 4989-4996

  • DOI: 10.1016/j.vaccine.2010.05.025
  • Primary Citation of Related Structures:  2MTY

  • PubMed Abstract: 
  • To block the different stages of Plasmodium falciparum invasion into human hepatocytes and red blood cells, we have focused on those proteins belonging to the pre-erythrocytic stage. One of these proteins is Sporozoite Threonine and Asparagine Rich P ...

    To block the different stages of Plasmodium falciparum invasion into human hepatocytes and red blood cells, we have focused on those proteins belonging to the pre-erythrocytic stage. One of these proteins is Sporozoite Threonine and Asparagine Rich Protein (STARP), which is a ligand used by P. falciparum parasites to bind Hepatic cells (HepG2). Previous studies on this protein identified two conserved peptides binding with high activity to HepG2 cells (namely 20546 and 20570) with corresponding critical hepatic-cell binding residues and determined an important role for these two peptides in the invasion process. This study shows the results of immunization trials in Aotus monkeys with native STARP peptides and analogues modified in critical hepatic-cell binding residues. The results show that native peptides are not immunogenic but can induce high-antibody titers when their critical residues are replaced by other with similar volume and mass but different polarity. Nuclear Magnetic Resonance ((1)H NMR) studies revealed that native peptides (non-immunogenic) displayed shorter alpha-helical regions compared to their highly immunogenic modified analogues. Binding assays with HLA-DRbeta1* molecules showed that 20546 modified peptides inducing high-antibody titers (24972, 24320 and 24486) bound to HLA-DRbeta1*0301 molecules, while the 20570 modified analogue (24322) bound to HLA-DRbeta1*0101. The results support including these high-immunogenic STARP-derived modified peptides as pre-erythrocytic candidates to be included in the design of a synthetic antimalarial vaccine.


    Organizational Affiliation

    Fundación Instituto de Inmunología de Colombia (FIDIC), Colombia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
STARP antigen
A
20Plasmodium falciparumGene Names: STARP
Find proteins for Q9U3Y8 (Plasmodium falciparum)
Go to UniProtKB:  Q9U3Y8
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-17
    Type: Initial release