Crystal structure of cobalt-bound Na-ASP-2

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.158 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Probing the equatorial groove of the hookworm protein and vaccine candidate antigen, Na-ASP-2.

Mason, L.Tribolet, L.Simon, A.von Gnielinski, N.Nienaber, L.Taylor, P.Willis, C.Jones, M.K.Sternberg, P.W.Gasser, R.B.Loukas, A.Hofmann, A.

(2014) Int J Biochem Cell Biol 50: 146-155

  • DOI: https://doi.org/10.1016/j.biocel.2014.03.003
  • Primary Citation of Related Structures:  
    4NUI, 4NUK, 4NUN, 4NUO

  • PubMed Abstract: 

    Hookworm activation-associated secreted proteins can be structurally classified into at least three different groups. The hallmark feature of Group 1 activation-associated secreted proteins is a prominent equatorial groove, which is inferred to form a ligand binding site. Furthermore, a conserved tandem histidine motif is located in the centre of the groove and believed to provide or support a yet to be determined catalytic activity. Here, we report three-dimensional crystal structures of Na-ASP-2, an L3-secreted activation-associated secreted protein from the human hookworm Necator americanus, which demonstrate transition metal binding ability of the conserved tandem histidine motif. We further identified moderate phosphohydrolase activity of recombinant Na-ASP-2, which relates to the tandem histidine motif. By panning a random 12-mer peptide phage library, we identified a peptide with high similarity to the human calcium-activated potassium channel SK3, and confirm binding of the synthetic peptide to recombinant Na-ASP-2 by differential scanning fluorimetry. Potential binding modes of the peptide to Na-ASP-2 were studied by molecular dynamics simulations which clearly identify a preferred topology of the Na-ASP-2:SK3 peptide complex.

  • Organizational Affiliation

    Structural Chemistry Program, Eskitis Institute, Griffith University, Brisbane, Queensland, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ancylostoma secreted protein 2210Necator americanusMutation(s): 0 
Gene Names: ASP2
Find proteins for J9ULM6 (Necator americanus)
Explore J9ULM6 
Go to UniProtKB:  J9ULM6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupJ9ULM6
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.158 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.309α = 90
b = 52.213β = 93.25
c = 43.541γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 2014-05-14 
  • Deposition Author(s): Hofmann, A.

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-14
    Type: Initial release
  • Version 1.1: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description