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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 | ||||||
要素 |
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キーワード | MOTOR PROTEIN / Kinesin / Microtubule | ||||||
| 機能・相同性 | 機能・相同性情報regulation of modification of synapse structure, modulating synaptic transmission / plus-end-directed vesicle transport along microtubule / cytoplasm organization / cytolytic granule membrane / anterograde dendritic transport of neurotransmitter receptor complex / mitocytosis / anterograde axonal protein transport / anterograde neuronal dense core vesicle transport / retrograde neuronal dense core vesicle transport / ciliary rootlet ...regulation of modification of synapse structure, modulating synaptic transmission / plus-end-directed vesicle transport along microtubule / cytoplasm organization / cytolytic granule membrane / anterograde dendritic transport of neurotransmitter receptor complex / mitocytosis / anterograde axonal protein transport / anterograde neuronal dense core vesicle transport / retrograde neuronal dense core vesicle transport / ciliary rootlet / lysosome localization / positive regulation of potassium ion transport / plus-end-directed microtubule motor activity / RHO GTPases activate KTN1 / Kinesins / vesicle transport along microtubule / 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 IQGAPs / RHO GTPases Activate Formins / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / MHC class II antigen presentation / centrosome localization / Recruitment of NuMA to mitotic centrosomes / mitochondrion transport along microtubule / microtubule motor activity / kinesin complex / COPI-mediated anterograde transport / COPI-dependent Golgi-to-ER retrograde traffic / natural killer cell mediated cytotoxicity / microtubule-based movement / stress granule disassembly / Insulin processing / synaptic vesicle transport / postsynaptic cytosol / phagocytic vesicle / axon cytoplasm / MHC class II antigen presentation / dendrite cytoplasm / axon guidance / positive regulation of synaptic transmission, GABAergic / positive regulation of protein localization to plasma membrane / sperm end piece / regulation of membrane potential / structural constituent of cytoskeleton / cellular response to type II interferon / microtubule cytoskeleton organization / neuron migration / centriolar satellite / Signaling by ALK fusions and activated point mutants / mitotic cell cycle / microtubule cytoskeleton / nuclear membrane / microtubule binding / vesicle / 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 / membrane / metal ion binding / identical protein binding / cytoplasm / cytosol 類似検索 - 分子機能 | ||||||
| 生物種 | Homo sapiens (ヒト)![]() | ||||||
| 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 | ||||||
データ登録者 | Makino, T. / Komori, Y. / Yanagisawa, H. / Tomishige, M. / Kikkawa, M. | ||||||
| 資金援助 | 日本, 1件
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引用 | ジャーナル: J Cell Biol / 年: 2025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. | ||||||
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9l7m.cif.gz | 369.3 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9l7m.ent.gz | 295.9 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9l7m.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/l7/9l7m ftp://data.pdbj.org/pub/pdb/validation_reports/l7/9l7m | HTTPS FTP |
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-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) Homo sapiens (ヒト) / 遺伝子: KIF5B, KNS, KNS1 / 発現宿主: ![]() #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
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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: FIELD EMISSION GUN / 加速電圧: 200 kV / 照射モード: FLOOD BEAM |
| 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 |
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万見について




Homo sapiens (ヒト)

日本, 1件
引用



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FIELD EMISSION GUN