- EMDB-2542: cryo-electron microscopy of microtubule-bound human kinesin-5 mot... -
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基本情報
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データベース: EMDB / ID: EMD-2542
タイトル
cryo-electron microscopy of microtubule-bound human kinesin-5 motor domain in rigor (gold cluster in the N-terminus A9C).
マップデータ
Reconstruction of microtubule-bound human kinesin-5 motor domain in absence of nucleotide (rigor state), and with a gold cluster covalently attached to the residue A9C
試料
試料: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotide. A gold cluster is attached to the N-terminus (A9C).
ジャーナル: Proc Natl Acad Sci U S A / 年: 2014 タイトル: Comprehensive structural model of the mechanochemical cycle of a mitotic motor highlights molecular adaptations in the kinesin family. 著者: Adeline Goulet / Jennifer Major / Yonggun Jun / Steven P Gross / Steven S Rosenfeld / Carolyn A Moores / 要旨: Kinesins are responsible for a wide variety of microtubule-based, ATP-dependent functions. Their motor domain drives these activities, but the molecular adaptations that specify these diverse and ...Kinesins are responsible for a wide variety of microtubule-based, ATP-dependent functions. Their motor domain drives these activities, but the molecular adaptations that specify these diverse and essential cellular activities are poorly understood. It has been assumed that the first identified kinesin--the transport motor kinesin-1--is the mechanistic paradigm for the entire superfamily, but accumulating evidence suggests otherwise. To address the deficits in our understanding of the molecular basis of functional divergence within the kinesin superfamily, we studied kinesin-5s, which are essential mitotic motors whose inhibition blocks cell division. Using cryo-electron microscopy and determination of structure at subnanometer resolution, we have visualized conformations of microtubule-bound human kinesin-5 motor domain at successive steps in its ATPase cycle. After ATP hydrolysis, nucleotide-dependent conformational changes in the active site are allosterically propagated into rotations of the motor domain and uncurling of the drug-binding loop L5. In addition, the mechanical neck-linker element that is crucial for motor stepping undergoes discrete, ordered displacements. We also observed large reorientations of the motor N terminus that indicate its importance for kinesin-5 function through control of neck-linker conformation. A kinesin-5 mutant lacking this N terminus is enzymatically active, and ATP-dependent neck-linker movement and motility are defective, although not ablated. All these aspects of kinesin-5 mechanochemistry are distinct from kinesin-1. Our findings directly demonstrate the regulatory role of the kinesin-5 N terminus in collaboration with the motor's structured neck-linker and highlight the multiple adaptations within kinesin motor domains that tune their mechanochemistries according to distinct functional requirements.
ダウンロード / ファイル: emd_2542.map.gz / 形式: CCP4 / 大きさ: 326.2 KB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Reconstruction of microtubule-bound human kinesin-5 motor domain in absence of nucleotide (rigor state), and with a gold cluster covalently attached to the residue A9C
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 nucleotide. A gold cluster is attached to the N-terminus (A9C).
要素
試料: 13-protofilament microtubule-bound human kinesin-5 motor domain in absence of nucleotide. A gold cluster is attached to the N-terminus (A9C).
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 nucleotide. A gold cluster is attached to the N-terminus (A9C). 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
名称: Kinesin-5 motor domain / タイプ: protein_or_peptide / ID: 3 / Name.synonym: KINESIN-LIKE PROTEIN KIF11 詳細: cys-lite mutant containing the substitution A9C, undecagold cluster was attached to the specific cysteine residue in the N-terminus (A9C) 組換発現: Yes
The particles were selected along individual microtubules.
CTF補正
詳細: FREALIGN
最終 再構成
想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 18.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: SPIDER, FREALIGN 詳細: Approximately 18,000 asymmetric units were averaged in the final reconstruction. 使用した粒子像数: 1385