8C4A image
Entry Detail
PDB ID:
8C4A
Title:
Structural and interactional insights into the glideosome-associated connector from Toxoplasma gondii
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-01-03
Release Date:
2023-07-19
Method Details:
Experimental Method:
Resolution:
2.68 Å
R-Value Free:
0.26
R-Value Work:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative anonymous antigen-1
Chain IDs:A
Chain Length:2498
Number of Molecules:1
Biological Source:Toxoplasma gondii
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Primary Citation
Structural and regulatory insights into the glideosome-associated connector from Toxoplasma gondii.
Elife 12 ? ? (2023)
PMID: 37014051 DOI: 10.7554/eLife.86049

Abstact

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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Primary Citation of related structures