- EMDB-8837: Sub-tomogram average of I1 dynein Post class -
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基本情報
登録情報
データベース: EMDB / ID: EMD-8837
タイトル
Sub-tomogram average of I1 dynein Post class
マップデータ
Sub-tomogram average of I1 dynein Post class: the two dynein heavy chains of sea urchin sperm flagellar I1 dynein complex are in the post-powerstroke state.
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM083122
米国
March of Dimes Foundation
米国
引用
ジャーナル: Science / 年: 2018 タイトル: Asymmetric distribution and spatial switching of dynein activity generates ciliary motility. 著者: Jianfeng Lin / Daniela Nicastro / 要旨: Motile cilia and flagella are essential, highly conserved organelles, and their motility is driven by the coordinated activities of multiple dynein isoforms. The prevailing "switch-point" hypothesis ...Motile cilia and flagella are essential, highly conserved organelles, and their motility is driven by the coordinated activities of multiple dynein isoforms. The prevailing "switch-point" hypothesis posits that dyneins are asymmetrically activated to drive flagellar bending. To test this model, we applied cryo-electron tomography to visualize activity states of individual dyneins relative to their locations along beating flagella of sea urchin sperm cells. As predicted, bending was generated by the asymmetric distribution of dynein activity on opposite sides of the flagellum. However, contrary to predictions, most dyneins were in their active state, and the smaller population of conformationally inactive dyneins switched flagellar sides relative to the bending direction. Thus, our data suggest a "switch-inhibition" mechanism in which force imbalance is generated by inhibiting, rather than activating, dyneins on alternating sides of the flagellum.
EMPIAR-10158 (タイトル: Cryo electron tomography of immotile sea urchin sperm flagella Data size: 13.8 Data #1: Tilt series of immotile sea urchin sperm flagella [tilt series])
ダウンロード / ファイル: emd_8837.map.gz / 形式: CCP4 / 大きさ: 704.1 KB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Sub-tomogram average of I1 dynein Post class: the two dynein heavy chains of sea urchin sperm flagellar I1 dynein complex are in the post-powerstroke state.
A: 788.48 Å / B: 443.52 Å / C: 492.8 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
9.856
9.856
9.856
M x/y/z
80
45
50
origin x/y/z
0.000
0.000
0.000
length x/y/z
788.480
443.520
492.800
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
-38
-19
-20
NX/NY/NZ
85
80
82
MAP C/R/S
1
2
3
start NC/NR/NS
0
0
0
NC/NR/NS
80
45
50
D min/max/mean
88.754
172.668
125.354
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添付データ
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試料の構成要素
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全体 : Sea urchin sperm
全体
名称: Sea urchin sperm
要素
細胞: Sea urchin sperm
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超分子 #1: Sea urchin sperm
超分子
名称: Sea urchin sperm / タイプ: cell / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: Sperm were diluted in demembranation buffer (30 mM HEPES, pH 8.0, 150 mM KCl, 4 mM MgCl2, 0.5 mM EGTA, 0.1% Triton X-100) and incubated for one minute to remove the flagellar membrane. The ...詳細: Sperm were diluted in demembranation buffer (30 mM HEPES, pH 8.0, 150 mM KCl, 4 mM MgCl2, 0.5 mM EGTA, 0.1% Triton X-100) and incubated for one minute to remove the flagellar membrane. The sperm were then collected by centrifugation at 1000x g, and resuspended in demembranation buffer (but without Triton X-100).