Structure of Schistosoma mansoni venom allergen-like protein 4 (SmVAL4)

Experimental Data Snapshot

  • Resolution: 2.16 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

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This is version 1.3 of the entry. See complete history


Schistosoma mansoni venom allergen-like protein 4 (SmVAL4) is a novel lipid-binding SCP/TAPS protein that lacks the prototypical CAP motifs.

Kelleher, A.Darwiche, R.Rezende, W.C.Farias, L.P.Leite, L.C.Schneiter, R.Asojo, O.A.

(2014) Acta Crystallogr D Biol Crystallogr 70: 2186-2196

  • DOI: https://doi.org/10.1107/S1399004714013315
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Schistosomiasis is a parasitic disease that affects over 200 million people. Vaccine candidates have been identified, including Schistosoma mansoni venom allergen-like proteins (SmVALs) from the SCP/TAPS (sperm-coating protein/Tpx/antigen 5/pathogenesis related-1/Sc7) superfamily. The first SmVAL structure, SmVAL4, was refined to a resolution limit of 2.16 Å. SmVAL4 has a unique structure that could not be predicted from homologous structures, with longer loops and an unusual C-terminal extension. SmVAL4 has the characteristic α/β-sandwich and central SCP/TAPS cavity. Furthermore, SmVAL4 has only one of the signature CAP cavity tetrad amino-acid residues and is missing the histidines that coordinate divalent cations such as Zn(2+) in other SCP/TAPS proteins. SmVAL4 has a cavity between α-helices 1 and 4 that was observed to bind lipids in tablysin-15, suggesting the ability to bind lipids. Subsequently, SmVAL4 was shown to bind cholesterol in vitro. Additionally, SmVAL4 was shown to complement the in vivo sterol-export phenotype of yeast mutants lacking their endogenous CAP proteins. Expression of SmVAL4 in yeast cells lacking endogenous CAP function restores the block in sterol export. These studies suggest an evolutionarily conserved lipid-binding function shared by CAP proteins such as SmVAL4 and yeast CAP proteins such as Pry1.

  • Organizational Affiliation

    National School of Tropical Medicine, Baylor College of Medicine, Houston, TX 77030, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Venom allergen-like (VAL) 4 protein162Schistosoma mansoniMutation(s): 0 
Gene Names: Smp_002070
Find proteins for Q1X6L4 (Schistosoma mansoni)
Explore Q1X6L4 
Go to UniProtKB:  Q1X6L4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1X6L4
Glycosylation Sites: 1
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAG

Download Ideal Coordinates CCD File 
B [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
Experimental Data & Validation

Experimental Data

  • Resolution: 2.16 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.645α = 90
b = 78.645β = 90
c = 83.52γ = 120
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2014-08-06 
  • Deposition Author(s): Asojo, O.A.

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-06
    Type: Initial release
  • Version 1.1: 2014-09-24
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references, Structure summary