- PDB-4aqv: Model of human kinesin-5 motor domain (3HQD) and mammalian tubuli... -
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基本情報
登録情報
データベース: PDB / ID: 4aqv
タイトル
Model of human kinesin-5 motor domain (3HQD) and mammalian tubulin heterodimer (1JFF) docked into the 9.7-angstrom cryo-EM map of microtubule-bound kinesin-5 motor domain in the AMPPPNP state.
要素
KINESIN-LIKE PROTEIN KIF11
TUBULIN ALPHA-1D CHAIN
TUBULIN BETA-2B CHAIN
キーワード
MOTOR PROTEIN / MICROTUBULE / MITOSIS / CANCER
機能・相同性
機能・相同性情報
spindle elongation / regulation of mitotic centrosome separation / plus-end-directed microtubule motor activity / mitotic centrosome separation / Kinesins / positive regulation of axon guidance / kinesin complex / microtubule motor activity / spindle organization / COPI-dependent Golgi-to-ER retrograde traffic ...spindle elongation / regulation of mitotic centrosome separation / plus-end-directed microtubule motor activity / mitotic centrosome separation / Kinesins / positive regulation of axon guidance / kinesin complex / microtubule motor activity / spindle organization / COPI-dependent Golgi-to-ER retrograde traffic / microtubule-based movement / mitotic spindle assembly / microtubule-based process / MHC class II antigen presentation / mitotic spindle organization / structural constituent of cytoskeleton / microtubule cytoskeleton organization / spindle / neuron migration / spindle pole / mitotic spindle / mitotic cell cycle / microtubule cytoskeleton / 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 / hydrolase activity / ciliary basal body / protein heterodimerization activity / cell division / intracellular membrane-bounded organelle / GTPase activity / protein kinase binding / GTP binding / protein-containing complex / ATP binding / metal ion binding / nucleus / membrane / cytosol / cytoplasm 類似検索 - 分子機能
ジャーナル: J Biol Chem / 年: 2012 タイトル: The structural basis of force generation by the mitotic motor kinesin-5. 著者: Adeline Goulet / William M Behnke-Parks / Charles V Sindelar / Jennifer Major / Steven S Rosenfeld / Carolyn A Moores / 要旨: Kinesin-5 is required for forming the bipolar spindle during mitosis. Its motor domain, which contains nucleotide and microtubule binding sites and mechanical elements to generate force, has evolved ...Kinesin-5 is required for forming the bipolar spindle during mitosis. Its motor domain, which contains nucleotide and microtubule binding sites and mechanical elements to generate force, has evolved distinct properties for its spindle-based functions. In this study, we report subnanometer resolution cryoelectron microscopy reconstructions of microtubule-bound human kinesin-5 before and after nucleotide binding and combine this information with studies of the kinetics of nucleotide-induced neck linker and cover strand movement. These studies reveal coupled, nucleotide-dependent conformational changes that explain many of this motor's properties. We find that ATP binding induces a ratchet-like docking of the neck linker and simultaneous, parallel docking of the N-terminal cover strand. Loop L5, the binding site for allosteric inhibitors of kinesin-5, also undergoes a dramatic reorientation when ATP binds, suggesting that it is directly involved in controlling nucleotide binding. Our structures indicate that allosteric inhibitors of human kinesin-5, which are being developed as anti-cancer therapeutics, bind to a motor conformation that occurs in the course of normal function. However, due to evolutionarily defined sequence variations in L5, this conformation is not adopted by invertebrate kinesin-5s, explaining their resistance to drug inhibition. Together, our data reveal the precision with which the molecular mechanism of kinesin-5 motors has evolved for force generation.
KINESIN-LIKEPROTEINKIF11 / KINESIN-5 / KINESIN-LIKE PROTEIN 1 / KINESIN-LIKE SPINDLE PRO KINESIN-RELATED MOTOR PROTEIN EG5 / ...KINESIN-5 / KINESIN-LIKE PROTEIN 1 / KINESIN-LIKE SPINDLE PRO KINESIN-RELATED MOTOR PROTEIN EG5 / THYROID RECEPTOR-INTERACTING PROTEIN 5 / TR-INTERACTING PROTEIN 5 / TRIP-5 / 座標モデル: Cα原子のみ
CYS-LIGHT CONSTRUCT (C25V,C43S,C87A,C99A). THE MUTATION T126C WAS INTRODUCED FOR GOLD-LABELLING.
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実験情報
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実験
実験
手法: 電子顕微鏡法
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
名称: 13-PROTOFILAMENT MICROTUBULE-BOUND HUMAN KINESIN-5 MOTOR DOMAIN WITH AMPPNP タイプ: COMPLEX
緩衝液
名称: 80 MM PIPES, 5 MM MGCL2, 1 MM EGTA, 5MM AMPPNP / pH: 6.8 / 詳細: 80 MM PIPES, 5 MM MGCL2, 1 MM EGTA, 5MM AMPPNP
試料
包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: HOLEY CARBON
急速凍結
装置: FEI VITROBOT MARK I / 凍結剤: ETHANE 詳細: CRYOGEN- ETHANE, HUMIDITY- 100, INSTRUMENT- FEI VITROBOT MARK I, METHOD- CHAMBER AT 24 DEGREES C, BLOT 2.5 SEC,
モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 最大 デフォーカス(公称値): 2200 nm / 最小 デフォーカス(公称値): 700 nm / Cs: 2 mm
試料ホルダ
温度: 90 K
撮影
電子線照射量: 18 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM
画像スキャン
デジタル画像の数: 46
放射波長
相対比: 1
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解析
EMソフトウェア
ID
名称
カテゴリ
1
Flex-EM
モデルフィッティング
2
UCSF Chimera
モデルフィッティング
3
FREALIGN
3次元再構成
4
SPIDER
3次元再構成
CTF補正
詳細: FREALIGN
3次元再構成
解像度: 9.7 Å / 粒子像の数: 3587 / ピクセルサイズ(公称値): 2.8 Å 詳細: THE N-TERMINAL RESIDUES 6 TO 16 WERE BUILT MANUALLY IN THE EM DENSITY. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2077. (DEPOSITION ID: 10751). 対称性のタイプ: HELICAL
原子モデル構築
プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: METHOD--RIGID BODY (1JFF). RIGID BODY AND FLEXIBLE FITTING (3HQD) REFINEMENT PROTOCOL--X-RAY