5WA2 | pdb_00005wa2

Crystal structure of Toxoplasma gondii SAG3 (SRS57)

• PDB DOI: https://doi.org/10.2210/pdb5WA2/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Toxoplasma gondii
• Expression System: Trichoplusia ni
• Mutation(s): No 


• Deposited: 2017-06-24 Released: 2018-06-27 
• Deposition Author(s): Parker, M.L., Boulanger, M.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.59 Å
• R-Value Free: 
  0.191 (Depositor), 0.200 (DCC) 
• R-Value Work: 
  0.169 (Depositor), 0.180 (DCC) 
• R-Value Observed: 
  0.170 (Depositor) 

Starting Model: experimental

Literature

A Toxoplasma lectin-specific activity for sulfated proteoglycans thought to promote infection competency is not dependent on TgSRS57 (TgSAG3)

Pszenny, V., Parker, M.L., Ramaswamy, R., Grigg, M.E., Boulanger, M.J.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 33.9 kDa 
• Atom Count: 2,524 
• Modeled Residue Count: 277 
• Deposited Residue Count: 304 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Surface antigen	A	304	Toxoplasma gondii	Mutation(s): 0  Gene Names: SAG3
UniProt
Find proteins for Q9BJ39 (Toxoplasma gondii) Explore Q9BJ39  Go to UniProtKB:  Q9BJ39

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	B [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.59 Å
• R-Value Free:  0.191 (Depositor), 0.200 (DCC) 
• R-Value Work:  0.169 (Depositor), 0.180 (DCC) 
• R-Value Observed: 0.170 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 48.13	α = 90
b = 59.71	β = 90
c = 101.42	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
Aimless	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2018-06-27 
Deposition Author(s): Parker, M.L., Boulanger, M.J.

Revision History  

• Version 1.0: 2018-06-27
  Type: Initial release
  
• Version 1.1: 2023-10-04
  Changes: Data collection, Database references, Refinement description
• Version 1.2: 2024-11-13
  Changes: Structure summary