6TMI image
Entry Detail
PDB ID:
6TMI
EMDB ID:
Title:
Cryo-EM structure of Toxoplasma gondii mitochondrial ATP synthase dimer, peripheral stalk model
Biological Source:
PDB Version:
Deposition Date:
2019-12-04
Release Date:
2020-12-16
Method Details:
Experimental Method:
Resolution:
3.50 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:subunit d
Chain IDs:C (auth: A)
Chain Length:536
Number of Molecules:1
Biological Source:Toxoplasma gondii (strain ATCC 50853 / GT1)
Polymer Type:polypeptide(L)
Description:subunit b
Chain IDs:E (auth: B)
Chain Length:571
Number of Molecules:1
Biological Source:Toxoplasma gondii (strain ATCC 50853 / GT1)
Polymer Type:polypeptide(L)
Description:ATP synthase subunit alpha
Chain IDs:A (auth: C)
Chain Length:565
Number of Molecules:1
Biological Source:Toxoplasma gondii (strain ATCC 50853 / GT1)
Polymer Type:polypeptide(L)
Description:Oligomycin sensitivity conferring protein (OSCP)
Chain IDs:B (auth: G)
Chain Length:252
Number of Molecules:1
Biological Source:Toxoplasma gondii (strain ATCC 50853 / GT1)
Polymer Type:polypeptide(L)
Description:ATPTG12
Chain IDs:D (auth: R)
Chain Length:134
Number of Molecules:1
Biological Source:Toxoplasma gondii (strain ATCC 50853 / GT1)
Ligand Molecules
Primary Citation
ATP synthase hexamer assemblies shape cristae of Toxoplasma mitochondria.
Nat Commun 12 120 120 (2021)
PMID: 33402698 DOI: 10.1038/s41467-020-20381-z

Abstact

Mitochondrial ATP synthase plays a key role in inducing membrane curvature to establish cristae. In Apicomplexa causing diseases such as malaria and toxoplasmosis, an unusual cristae morphology has been observed, but its structural basis is unknown. Here, we report that the apicomplexan ATP synthase assembles into cyclic hexamers, essential to shape their distinct cristae. Cryo-EM was used to determine the structure of the hexamer, which is held together by interactions between parasite-specific subunits in the lumenal region. Overall, we identified 17 apicomplexan-specific subunits, and a minimal and nuclear-encoded subunit-a. The hexamer consists of three dimers with an extensive dimer interface that includes bound cardiolipins and the inhibitor IF1. Cryo-ET and subtomogram averaging revealed that hexamers arrange into ~20-megadalton pentagonal pyramids in the curved apical membrane regions. Knockout of the linker protein ATPTG11 resulted in the loss of pentagonal pyramids with concomitant aberrantly shaped cristae. Together, this demonstrates that the unique macromolecular arrangement is critical for the maintenance of cristae morphology in Apicomplexa.

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Disease

Primary Citation of related structures