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| Title | α- and β-Tubulin Lattice of the Axonemal Microtubule Doublet and Binding Proteins Revealed by Single Particle Cryo-Electron Microscopy and Tomography. |
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| Journal, issue, pages | Structure, Vol. 23, Issue 9, Page 1584-1595, Year 2015 |
| Publish date | Sep 1, 2015 |
 Authors | Aditi Maheshwari / Jagan Mohan Obbineni / Khanh Huy Bui / Keitaro Shibata / Yoko Y Toyoshima / Takashi Ishikawa /   |
| PubMed Abstract | Microtubule doublet (MTD) is the main skeleton of cilia/flagella. Many proteins, such as dyneins and radial spokes, bind to MTD, and generate or regulate force. While the structure of the ...Microtubule doublet (MTD) is the main skeleton of cilia/flagella. Many proteins, such as dyneins and radial spokes, bind to MTD, and generate or regulate force. While the structure of the reconstituted microtubule has been solved at atomic resolution, nature of the axonemal MTD is still unclear. There are a few hypotheses of the lattice arrangement of its α- and β-tubulins, but it has not been described how dyneins and radial spokes bind to MTD. In this study, we analyzed the three-dimensional structure of Tetrahymena MTD at ∼19 Å resolution by single particle cryo-electron microscopy. To identify α- and β-tubulins, we combined image analysis of MTD with specific kinesin decoration. This work reveals that α- and β-tubulins form a B-lattice arrangement in the entire MTD with a seam at the outer junction. We revealed the unique way in which inner arm dyneins, radial spokes, and proteins inside MTD bind and bridge protofilaments. |
 External links | Structure / PubMed:26211611 |
| Methods | EM (single particle) |
| Resolution | 23.0 Å |
| Structure data | |
| Chemicals |  ChemComp-GTP:  ChemComp-MG:  ChemComp-G2P:  ChemComp-HOH: |
| Source |
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 Keywords | STRUCTURAL PROTEIN / tubulin / microtubule doublet / cilia |
tetrahymena thermophila (eukaryote)