7QE4

B-trefoil lectin from Salpingoeca rosetta in complex with GalNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.169 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

The choanoflagellate pore-forming lectin SaroL-1 punches holes in cancer cells by targeting the tumor-related glycosphingolipid Gb3.

Notova, S.Bonnardel, F.Rosato, F.Siukstaite, L.Schwaiger, J.Lim, J.H.Bovin, N.Varrot, A.Ogawa, Y.Romer, W.Lisacek, F.Imberty, A.

(2022) Commun Biol 5: 954-954

  • DOI: https://doi.org/10.1038/s42003-022-03869-w
  • Primary Citation of Related Structures:  
    7QE3, 7QE4, 7R55

  • PubMed Abstract: 

    Choanoflagellates are primitive protozoa used as models for animal evolution. They express a large variety of multi-domain proteins contributing to adhesion and cell communication, thereby providing a rich repertoire of molecules for biotechnology. Adhesion often involves proteins adopting a β-trefoil fold with carbohydrate-binding properties therefore classified as lectins. Sequence database screening with a dedicated method resulted in TrefLec, a database of 44714 β-trefoil candidate lectins across 4497 species. TrefLec was searched for original domain combinations, which led to single out SaroL-1 in the choanoflagellate Salpingoeca rosetta, that contains both β-trefoil and aerolysin-like pore-forming domains. Recombinant SaroL-1 is shown to bind galactose and derivatives, with a stronger affinity for cancer-related α-galactosylated epitopes such as the glycosphingolipid Gb3, when embedded in giant unilamellar vesicles or cell membranes. Crystal structures of complexes with Gb3 trisaccharide and GalNAc provided the basis for building a model of the oligomeric pore. Finally, recognition of the αGal epitope on glycolipids required for hemolysis of rabbit erythrocytes suggests that toxicity on cancer cells is achieved through carbohydrate-dependent pore-formation.


  • Organizational Affiliation

    Univ. Grenoble Alpes, CNRS, CERMAV, 38000, Grenoble, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sarol-1A [auth AAA],
B [auth BBB]
350Salpingoeca rosettaMutation(s): 0 
Gene Names: PTSG_08235
UniProt
Find proteins for F2UID9 (Salpingoeca rosetta (strain ATCC 50818 / BSB-021))
Explore F2UID9 
Go to UniProtKB:  F2UID9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF2UID9
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NGA (Subject of Investigation/LOI)
Query on NGA

Download Ideal Coordinates CCD File 
F [auth AAA],
K [auth BBB]
2-acetamido-2-deoxy-beta-D-galactopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-JAJWTYFOSA-N
A2G (Subject of Investigation/LOI)
Query on A2G

Download Ideal Coordinates CCD File 
C [auth AAA]
D [auth AAA]
E [auth AAA]
H [auth BBB]
I [auth BBB]
C [auth AAA],
D [auth AAA],
E [auth AAA],
H [auth BBB],
I [auth BBB],
J [auth BBB]
2-acetamido-2-deoxy-alpha-D-galactopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-CBQIKETKSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
G [auth AAA]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
L [auth BBB],
M [auth BBB]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.158α = 90
b = 59.254β = 90
c = 209.612γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
H2020 Marie Curie Actions of the European CommissionEuropean Union814029

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-14
    Type: Initial release
  • Version 1.1: 2022-09-28
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description