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-Structure paper
| タイトル | SPACA9 is a lumenal protein of human ciliary singlet and doublet microtubules. |
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| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 119, Issue 41, Page e2207605119, Year 2022 |
| 掲載日 | 2022年10月11日 |
著者 | Miao Gui / Jacob T Croft / Davide Zabeo / Vajradhar Acharya / Justin M Kollman / Thomas Burgoyne / Johanna L Höög / Alan Brown / ![]() |
| PubMed 要旨 | The cilium-centrosome complex contains triplet, doublet, and singlet microtubules. The lumenal surfaces of each microtubule within this diverse array are decorated by microtubule inner proteins ...The cilium-centrosome complex contains triplet, doublet, and singlet microtubules. The lumenal surfaces of each microtubule within this diverse array are decorated by microtubule inner proteins (MIPs). Here, we used single-particle cryo-electron microscopy methods to build atomic models of two types of human ciliary microtubule: the doublet microtubules of multiciliated respiratory cells and the distal singlet microtubules of monoflagellated human spermatozoa. We discover that SPACA9 is a polyspecific MIP capable of binding both microtubule types. SPACA9 forms intralumenal striations in the B tubule of respiratory doublet microtubules and noncontinuous spirals in sperm singlet microtubules. By acquiring new and reanalyzing previous cryo-electron tomography data, we show that SPACA9-like intralumenal striations are common features of different microtubule types in animal cilia. Our structures provide detailed references to help rationalize ciliopathy-causing mutations and position cryo-EM as a tool for the analysis of samples obtained directly from ciliopathy patients. |
リンク | Proc Natl Acad Sci U S A / PubMed:36191189 / PubMed Central |
| 手法 | EM (トモグラフィー) / EM (サブトモグラム平均) / EM (単粒子) |
| 解像度 | 3.6 - 20.0 Å |
| 構造データ | ![]() EMDB-14723: Tomogram of bovine sperm singlet microtubules ![]() EMDB-14730: Tomogram of chicken sperm distal microtubules ![]() EMDB-14732: Tomogram of frog sperm singlet distal microtubules ![]() EMDB-15451: Sub-tomogram average of TAILS in bovine sperm tail tip singlet microtubules. EMDB-26611: Composite cryo-EM density map of the 8-nm repeat of the human sperm tip singlet microtubule EMDB-26624: Composite cryo-EM density map of the 48-nm repeat of the human respiratory doublet microtubule |
| 化合物 | ![]() ChemComp-GDP: ![]() ChemComp-GTP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | STRUCTURAL PROTEIN / cilia / microtubule / sperm / cell motility |
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homo sapiens (ヒト)
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