View source for 7tnq


==The symmetry-released subpellicular microtubule map from detergent-extracted Toxoplasma cells==
<StructureSection load='7tnq' size='340' side='right'caption='[[7tnq]], [[Resolution|resolution]] 8.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7tnq]] is a 100 chain structure with sequence from [https://en.wikipedia.org/wiki/Toxoplasma_gondii_ME49 Toxoplasma gondii ME49]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7TNQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7TNQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 8.4&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7tnq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7tnq OCA], [https://pdbe.org/7tnq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7tnq RCSB], [https://www.ebi.ac.uk/pdbsum/7tnq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7tnq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S8F1Y1_TOXGM S8F1Y1_TOXGM] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
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.

Cryo-ET of Toxoplasma parasites gives subnanometer insight into tubulin-based structures.,Sun SY, Segev-Zarko LA, Chen M, Pintilie GD, Schmid MF, Ludtke SJ, Boothroyd JC, Chiu W Proc Natl Acad Sci U S A. 2022 Feb 8;119(6):e2111661119. doi: , 10.1073/pnas.2111661119. PMID:35121661<ref>PMID:35121661</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7tnq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Toxoplasma gondii ME49]]
[[Category: Chen M]]
[[Category: Pintilie GD]]
[[Category: Sun SY]]