7TNS

Subpellicular microtubule from detergent-extract Toxoplasma gondii cells


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.70 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Cryo-ET of Toxoplasma parasites gives subnanometer insight into tubulin-based structures.

Sun, S.Y.Segev-Zarko, L.A.Chen, M.Pintilie, G.D.Schmid, M.F.Ludtke, S.J.Boothroyd, J.C.Chiu, W.

(2022) Proc Natl Acad Sci U S A 119

  • DOI: 10.1073/pnas.2111661119
  • Primary Citation of Related Structures:  
    7TNQ, 7TNS, 7TNT

  • PubMed Abstract: 
  • Tubulin is a conserved protein that polymerizes into different forms of filamentous structures in Toxoplasma gondii , an obligate intracellular parasite in the phylum Apicomplexa. Two key tubulin-containing cytoskeletal components are subpellicular microtubules (SPMTs) and conoid fibrils (CFs) ...

    Tubulin is a conserved protein that polymerizes into different forms of filamentous structures in Toxoplasma gondii , an obligate intracellular parasite in the phylum Apicomplexa. Two key tubulin-containing cytoskeletal components are subpellicular microtubules (SPMTs) and conoid fibrils (CFs). The SPMTs help maintain shape and gliding motility, while the CFs are implicated in invasion. Here, we use cryogenic electron tomography to determine the molecular structures of the SPMTs and CFs in vitrified intact and detergent-extracted parasites. Subvolume densities from detergent-extracted parasites yielded averaged density maps at subnanometer resolutions, and these were related back to their architecture in situ. An intralumenal spiral lines the interior of the 13-protofilament SPMTs, revealing a preferred orientation of these microtubules relative to the parasite's long axis. Each CF is composed of nine tubulin protofilaments that display a comma-shaped cross-section, plus additional associated components. Conoid protrusion, a crucial step in invasion, is associated with an altered pitch of each CF. The use of basic building blocks of protofilaments and different accessory proteins in one organism illustrates the versatility of tubulin to form two distinct types of assemblies, SPMTs and CFs.


    Organizational Affiliation

    Division of CryoEM and Bioimaging, SSRL, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Microtubule associated protein SPM1351Toxoplasma gondii ME49Mutation(s): 0 
Gene Names: SPM1TGME49_263520
UniProt
Find proteins for S8F1Y1 (Toxoplasma gondii (strain ATCC 50611 / Me49))
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Go to UniProtKB:  S8F1Y1
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupS8F1Y1
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha chain453Toxoplasma gondii ME49Mutation(s): 0 
UniProt
Find proteins for P10873 (Toxoplasma gondii)
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Go to UniProtKB:  P10873
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UniProt GroupP10873
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta chain449Toxoplasma gondii ME49Mutation(s): 0 
Gene Names: TGME49_266960
UniProt
Find proteins for A0A125YWG5 (Toxoplasma gondii (strain ATCC 50611 / Me49))
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Go to UniProtKB:  A0A125YWG5
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UniProt GroupA0A125YWG5
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
PDI family protein220Toxoplasma gondii ME49Mutation(s): 0 
Gene Names: TGME49_232410
EC: 1.8.1.8
UniProt
Find proteins for A0A125YMM3 (Toxoplasma gondii (strain ATCC 50611 / Me49))
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UniProt GroupA0A125YMM3
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
PDI family proteinUC [auth w]189Toxoplasma gondii ME49Mutation(s): 0 
Gene Names: TGME49_225790
UniProt
Find proteins for A0A125YFI4 (Toxoplasma gondii (strain ATCC 50611 / Me49))
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Go to UniProtKB:  A0A125YFI4
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UniProt GroupA0A125YFI4
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.70 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesS10OD021600
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP41GM103832
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM079429
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP01GM121203
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR21MH125285-01A1

Revision History  (Full details and data files)

  • Version 1.0: 2022-06-22
    Type: Initial release