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基本情報
登録情報 | データベース: PDB / ID: 9l7m | ||||||
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タイトル | Nucleotide-free kinesin-1 motor domain bound to the microtubule | ||||||
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![]() | MOTOR PROTEIN / Kinesin / Microtubule | ||||||
機能・相同性 | ![]() regulation of modification of synapse structure, modulating synaptic transmission / cytolytic granule membrane / plus-end-directed vesicle transport along microtubule / cytoplasm organization / anterograde dendritic transport of neurotransmitter receptor complex / anterograde neuronal dense core vesicle transport / mitochondrion transport along microtubule / mitocytosis / retrograde neuronal dense core vesicle transport / anterograde axonal protein transport ...regulation of modification of synapse structure, modulating synaptic transmission / cytolytic granule membrane / plus-end-directed vesicle transport along microtubule / cytoplasm organization / anterograde dendritic transport of neurotransmitter receptor complex / anterograde neuronal dense core vesicle transport / mitochondrion transport along microtubule / mitocytosis / retrograde neuronal dense core vesicle transport / anterograde axonal protein transport / ciliary rootlet / lysosome localization / positive regulation of potassium ion transport / vesicle transport along microtubule / plus-end-directed microtubule motor activity / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Resolution of Sister Chromatid Cohesion / Hedgehog 'off' state / Cilium Assembly / Intraflagellar transport / COPI-dependent Golgi-to-ER retrograde traffic / Mitotic Prometaphase / Carboxyterminal post-translational modifications of tubulin / RHOH GTPase cycle / EML4 and NUDC in mitotic spindle formation / Sealing of the nuclear envelope (NE) by ESCRT-III / Kinesins / PKR-mediated signaling / Separation of Sister Chromatids / The role of GTSE1 in G2/M progression after G2 checkpoint / Aggrephagy / RHO GTPases activate KTN1 / Kinesins / RHO GTPases activate IQGAPs / RHO GTPases Activate Formins / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / kinesin complex / MHC class II antigen presentation / Recruitment of NuMA to mitotic centrosomes / microtubule motor activity / COPI-mediated anterograde transport / centrosome localization / COPI-dependent Golgi-to-ER retrograde traffic / microtubule-based movement / stress granule disassembly / natural killer cell mediated cytotoxicity / synaptic vesicle transport / Insulin processing / postsynaptic cytosol / phagocytic vesicle / axon cytoplasm / dendrite cytoplasm / MHC class II antigen presentation / axon guidance / regulation of membrane potential / positive regulation of synaptic transmission, GABAergic / positive regulation of protein localization to plasma membrane / structural constituent of cytoskeleton / cellular response to type II interferon / centriolar satellite / microtubule cytoskeleton organization / Signaling by ALK fusions and activated point mutants / neuron migration / mitotic cell cycle / microtubule cytoskeleton / vesicle / nuclear membrane / microtubule binding / 加水分解酵素; 酸無水物に作用; GTPに作用・細胞または細胞小器官の運動に関与 / microtubule / cadherin binding / GTPase activity / GTP binding / protein-containing complex binding / perinuclear region of cytoplasm / ATP hydrolysis activity / mitochondrion / ATP binding / metal ion binding / identical protein binding / membrane / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.48 Å | ||||||
![]() | Makino, T. / Komori, Y. / Yanagisawa, H. / Tomishige, M. / Kikkawa, M. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Tension-induced suppression of allosteric conformational changes coordinates kinesin-1 stepping. 著者: Tsukasa Makino / Ryo Kanada / Teppei Mori / Ken-Ichi Miyazono / Yuta Komori / Haruaki Yanagisawa / Shoji Takada / Masaru Tanokura / Masahide Kikkawa / Michio Tomishige / ![]() 要旨: Kinesin-1 walks along microtubules by alternating ATP hydrolysis and movement of its two motor domains ("head"). The detached head preferentially binds to the forward tubulin-binding site after ATP ...Kinesin-1 walks along microtubules by alternating ATP hydrolysis and movement of its two motor domains ("head"). The detached head preferentially binds to the forward tubulin-binding site after ATP binds to the microtubule-bound head, but the mechanism preventing premature microtubule binding while the partner head awaits ATP remains unknown. Here, we examined the role of the neck linker, the segment connecting two heads, in this mechanism. Structural analyses of the nucleotide-free head revealed a bulge just ahead of the neck linker's base, creating an asymmetric constraint on its mobility. While the neck linker can stretch freely backward, it must navigate around this bulge to extend forward. We hypothesized that increased neck linker tension suppresses premature binding of the tethered head, which was supported by molecular dynamics simulations and single-molecule fluorescence assays. These findings demonstrate a tension-dependent allosteric mechanism that coordinates the movement of two heads, where neck linker tension modulates the allosteric conformational changes rather than directly affecting the nucleotide state. | ||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 369.3 KB | 表示 | ![]() |
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PDB形式 | ![]() | 295.9 KB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.4 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.4 MB | 表示 | |
XML形式データ | ![]() | 74.4 KB | 表示 | |
CIF形式データ | ![]() | 107.7 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 50204.445 Da / 分子数: 2 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() 参照: UniProt: Q2XVP4, 加水分解酵素; 酸無水物に作用; GTPに作用・細胞または細胞小器官の運動に関与 #2: タンパク質 | 分子量: 49907.770 Da / 分子数: 2 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() #3: タンパク質 | | 分子量: 40263.395 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #4: 化合物 | ChemComp-GTP / #5: 化合物 | ChemComp-MG / 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: FILAMENT / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 |
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由来(天然) |
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由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||||||||
緩衝液 | pH: 6.8 | ||||||||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TALOS ARCTICA |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
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解析
EMソフトウェア | 名称: RELION / バージョン: 3 / カテゴリ: CTF補正 |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
3次元再構成 | 解像度: 3.48 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 74859 / 対称性のタイプ: POINT |