+検索条件
-Structure paper
タイトル | Tubulin lattice in cilia is in a stressed form regulated by microtubule inner proteins. |
---|---|
ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 116, Issue 40, Page 19930-19938, Year 2019 |
掲載日 | 2019年10月1日 |
著者 | Muneyoshi Ichikawa / Ahmad Abdelzaher Zaki Khalifa / Shintaroh Kubo / Daniel Dai / Kaustuv Basu / Mohammad Amin Faghfor Maghrebi / Javier Vargas / Khanh Huy Bui / |
PubMed 要旨 | Cilia, the hair-like protrusions that beat at high frequencies to propel a cell or move fluid around are composed of radially bundled doublet microtubules. In this study, we present a near-atomic ...Cilia, the hair-like protrusions that beat at high frequencies to propel a cell or move fluid around are composed of radially bundled doublet microtubules. In this study, we present a near-atomic resolution map of the doublet microtubule by cryoelectron microscopy. The map demonstrates that the network of microtubule inner proteins weaves into the tubulin lattice and forms an inner sheath. From mass spectrometry data and de novo modeling, we identified Rib43a proteins as the filamentous microtubule inner proteins in the protofilament ribbon region. The Rib43a-tubulin interaction leads to an elongated tubulin dimer distance every 2 dimers. In addition, the tubulin lattice structure with missing microtubule inner proteins (MIPs) by sarkosyl treatment shows significant longitudinal compaction and lateral angle change between protofilaments. These results are evidence that the MIPs directly affect and stabilize the tubulin lattice. It suggests that the doublet microtubule is an intrinsically stressed filament and that this stress could be manipulated in the regulation of ciliary waveforms. |
リンク | Proc Natl Acad Sci U S A / PubMed:31527277 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.16 - 4.9 Å |
構造データ | EMDB-20602: Cryo-EM structure of the 48-nm repeat unit of the doublet microtubule from Tetrahymena thermophila EMDB-20603: EMDB-20606: |
化合物 | ChemComp-GTP: ChemComp-MG: ChemComp-GDP: |
由来 |
|
キーワード | STRUCTURAL PROTEIN / cilia / doublet / axoneme / microtubule inner protein / ribbon proteins |