- EMDB-2079: Electron cryo-microscopy of microtubule-bound human kinesin-5 mot... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-2079
タイトル
Electron cryo-microscopy of microtubule-bound human kinesin-5 motor domain in rigor state (gold cluster in loop5 T126C).
マップデータ
3D reconstruction of microtubule-bound human kinesin-5 motor domain with an empty nucleotide-binding site and a gold cluster attached to loop5 (T126C).
試料
試料: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotides. A gold cluster is attached to loop5 (T126C).
タンパク質・ペプチド: alpha tubulin
タンパク質・ペプチド: beta tubulin
タンパク質・ペプチド: Kinesin-5 motor domain
キーワード
electron cryo-microscopy / kinesin / microtubule / mitosis / cancer
機能・相同性
Kinesin motor domain, conserved site / Alpha tubulin / Beta tubulin, autoregulation binding site
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.
ダウンロード / ファイル: emd_2079.map.gz / 形式: CCP4 / 大きさ: 348.6 KB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
3D reconstruction of microtubule-bound human kinesin-5 motor domain with an empty nucleotide-binding site and a gold cluster attached to loop5 (T126C).
全体 : 13-protofilament microtubule-bound human kinesin-5 motor domain i...
全体
名称: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotides. A gold cluster is attached to loop5 (T126C).
要素
試料: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotides. A gold cluster is attached to loop5 (T126C).
タンパク質・ペプチド: alpha tubulin
タンパク質・ペプチド: beta tubulin
タンパク質・ペプチド: Kinesin-5 motor domain
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超分子 #1000: 13-protofilament microtubule-bound human kinesin-5 motor domain i...
超分子
名称: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotides. A gold cluster is attached to loop5 (T126C). タイプ: sample / ID: 1000 集合状態: 13-protofilament microtubule with one kinesin-5 motor domain bound every tubulin heterodimers Number unique components: 3
InterPro: Beta tubulin, autoregulation binding site
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分子 #3: Kinesin-5 motor domain
分子
名称: Kinesin-5 motor domain / タイプ: protein_or_peptide / ID: 3 / Name.synonym: KINESIN-LIKE PROTEIN KIF11 詳細: undecagold cluster was attached to the specific cysteine residue in loop5 (T126C) 集合状態: monomer / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human
組換発現
生物種: Escherichia coli (大腸菌) / 組換プラスミド: pET21a
配列
InterPro: Kinesin motor domain, conserved site
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
緩衝液
pH: 6.8 / 詳細: 80 mM PIPES, 5 mM MgCl2, 1 mM EGTA, 1 U/mL apyrase
グリッド
詳細: 400 mesh holey carbon grids
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK I / 手法: chamber at 24 degrees C, blot 2.5 sec
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電子顕微鏡法
顕微鏡
FEI TECNAI F20
温度
平均: 90 K
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected at 150,000 times magnification
The particles were selected along individual microtubules.
CTF補正
詳細: FREALIGN
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 11.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: SPIDER, FREALIGN 詳細: Approximately 23,000 asymmetric units were averaged in the final reconstruction. The deposited map is low pass filtered at 16 A. 使用した粒子像数: 2027