National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM140813
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM127571
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM118099
米国
引用
ジャーナル: EMBO J / 年: 2025 タイトル: The structure of basal body inner junctions from Tetrahymena revealed by electron cryo-tomography. 著者: Sam Li / Jose-Jesus Fernandez / Marisa D Ruehle / Rachel A Howard-Till / Amy Fabritius / Chad G Pearson / David A Agard / Mark E Winey / 要旨: The cilium is a microtubule-based eukaryotic organelle critical for many cellular functions. Its assembly initiates at a basal body and continues as an axoneme that projects out of the cell to form a ...The cilium is a microtubule-based eukaryotic organelle critical for many cellular functions. Its assembly initiates at a basal body and continues as an axoneme that projects out of the cell to form a functional cilium. This assembly process is tightly regulated. However, our knowledge of the molecular architecture and the mechanism of assembly is limited. By applying cryo-electron tomography, we obtained structures of the inner junction in three regions of the cilium from Tetrahymena: the proximal, the central core of the basal body, and the axoneme. We identified several protein components in the basal body. While a few proteins are distributed throughout the entire length of the organelle, many are restricted to specific regions, forming intricate local interaction networks in the inner junction and bolstering local structural stability. By examining the inner junction in a POC1 knockout mutant, we found the triplet microtubule was destabilized, resulting in a defective structure. Surprisingly, several axoneme-specific components were found to "infiltrate" into the mutant basal body. Our findings provide molecular insight into cilium assembly at the inner junctions, underscoring its precise spatial regulation.
ダウンロード / ファイル: emd_46440.map.gz / 形式: CCP4 / 大きさ: 15.6 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
A 16-nm repeat of A-B inner junction of TMT from the central core region of basal body, wild-type
ボクセルのサイズ
X=Y=Z: 2.7 Å
密度
表面レベル
登録者による: 0.0967
最小 - 最大
-0.29063842 - 0.41609424
平均 (標準偏差)
0.0016436084 (±0.02327501)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
0
0
0
サイズ
160
160
160
Spacing
160
160
160
セル
A=B=C: 432.0 Å α=β=γ: 90.0 °
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添付データ
-
試料の構成要素
-
全体 : Triplet and doublet microtubule from basal body and axoneme isola...
全体
名称: Triplet and doublet microtubule from basal body and axoneme isolated from Tetrahymena thermophila
要素
細胞器官・細胞要素: Triplet and doublet microtubule from basal body and axoneme isolated from Tetrahymena thermophila
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超分子 #1: Triplet and doublet microtubule from basal body and axoneme isola...
超分子
名称: Triplet and doublet microtubule from basal body and axoneme isolated from Tetrahymena thermophila タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 / 含まれる分子: #1