7TNT の概要
| エントリーDOI | 10.2210/pdb7tnt/pdb |
| EMDBエントリー | 26018 26020 |
| 分子名称 | Tubulin alpha chain, Tubulin beta chain (2 entities in total) |
| 機能のキーワード | parasites, toxoplasma gondii, cytoskeleton, conoid, tubulin, cell invasion |
| 由来する生物種 | Toxoplasma gondii 詳細 |
| タンパク質・核酸の鎖数 | 36 |
| 化学式量合計 | 1730283.32 |
| 構造登録者 | |
| 主引用文献 | Sun, S.Y.,Segev-Zarko, L.A.,Chen, M.,Pintilie, G.D.,Schmid, M.F.,Ludtke, S.J.,Boothroyd, J.C.,Chiu, W. Cryo-ET of Toxoplasma parasites gives subnanometer insight into tubulin-based structures. Proc.Natl.Acad.Sci.USA, 119:-, 2022 Cited by PubMed Abstract: Tubulin is a conserved protein that polymerizes into different forms of filamentous structures in , 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. PubMed: 35121661DOI: 10.1073/pnas.2111661119 主引用文献が同じPDBエントリー |
| 実験手法 | ELECTRON MICROSCOPY (9.3 Å) |
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