8C4A

Structural and interactional insights into the glideosome-associated connector from Toxoplasma gondii

• PDB DOI: https://doi.org/10.2210/pdb8C4A/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Toxoplasma gondii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2023-01-03 Released: 2023-07-19 
• Deposition Author(s): Kumar, A., Morgan, R.M.L., Matthews, S.J.
• Funding Organization(s): Imperial College London

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.67 Å
• R-Value Free: 0.268 
• R-Value Work: 0.209 

Literature

Structural and regulatory insights into the glideosome-associated connector from Toxoplasma gondii.

Kumar, A., Vadas, O., Dos Santos Pacheco, N., Zhang, X., Chao, K., Darvill, N., Rasmussen, H.O., Xu, Y., Lin, G.M., Stylianou, F.A., Pedersen, J.S., Rouse, S.L., Morgan, M.L., Soldati-Favre, D., Matthews, S.

(2023) Elife 12

• PubMed: 37014051 
• DOI: https://doi.org/10.7554/eLife.86049
• Primary Citation of Related Structures:  
  8C4A


• PubMed Abstract: 
  

  The phylum of Apicomplexa groups intracellular parasites that employ substrate-dependent gliding motility to invade host cells, egress from the infected cells, and cross biological barriers. The glideosome-associated connector (GAC) is a conserved protein essential to this process. GAC facilitates the association of actin filaments with surface transmembrane adhesins and the efficient transmission of the force generated by myosin translocation of actin to the cell surface substrate. Here, we present the crystal structure of Toxoplasma gondii GAC and reveal a unique, supercoiled armadillo repeat region that adopts a closed ring conformation. Characterisation of the solution properties together with membrane and F-actin binding interfaces suggests that GAC adopts several conformations from closed to open and extended. A multi-conformational model for assembly and regulation of GAC within the glideosome is proposed.

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Organizational Affiliation: 

Department of Life Sciences, Imperial College London, London, United Kingdom.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 274.38 kDa 
• Atom Count: 18,791 
• Modelled Residue Count: 2,474 
• Deposited Residue Count: 2,498 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Putative anonymous antigen-1	A	2,498	Toxoplasma gondii	Mutation(s): 0  Gene Names: TGRH88_051880
UniProt
Find proteins for A0A7J6JYP1 (Toxoplasma gondii) Explore A0A7J6JYP1  Go to UniProtKB:  A0A7J6JYP1

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.67 Å
• R-Value Free: 0.268 
• R-Value Work: 0.209 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 119.078	α = 90
b = 123.605	β = 90
c = 221.508	γ = 90

Software Package:

Software Name	Purpose
SHELX	phasing
XDS	data reduction
REFMAC	refinement
Coot	model building

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-07-19 
Deposition Author(s): Kumar, A., Morgan, R.M.L., Matthews, S.J.

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Funding Organization	Location	Grant Number
Imperial College London	United Kingdom	--

Revision History  

• Version 1.0: 2023-07-19
  Type: Initial release