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基本情報
登録情報 | データベース: PDB / ID: 8rbf | ||||||||||||||||||
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タイトル | CryoEM structure of the post-powerstroke actomyosin-5a complex | ||||||||||||||||||
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![]() | MOTOR PROTEIN / Myosin / Actin / Actomyosin / Primed actomyosin | ||||||||||||||||||
機能・相同性 | ![]() establishment of endoplasmic reticulum localization to postsynapse / regulation of postsynaptic cytosolic calcium ion concentration / melanosome localization / endoplasmic reticulum localization / locomotion involved in locomotory behavior / melanin metabolic process / vesicle transport along actin filament / unconventional myosin complex / insulin-responsive compartment / developmental pigmentation ...establishment of endoplasmic reticulum localization to postsynapse / regulation of postsynaptic cytosolic calcium ion concentration / melanosome localization / endoplasmic reticulum localization / locomotion involved in locomotory behavior / melanin metabolic process / vesicle transport along actin filament / unconventional myosin complex / insulin-responsive compartment / developmental pigmentation / secretory granule localization / Regulation of MITF-M-dependent genes involved in pigmentation / actin filament-based movement / Regulation of actin dynamics for phagocytic cup formation / hair follicle maturation / melanin biosynthetic process / melanocyte differentiation / melanosome transport / actomyosin / myosin complex / intermediate filament / odontogenesis / long-chain fatty acid biosynthetic process / insulin secretion / cytoskeletal motor activator activity / microfilament motor activity / myosin heavy chain binding / pigmentation / tropomyosin binding / actin filament bundle / troponin I binding / filamentous actin / exocytosis / mesenchyme migration / smooth endoplasmic reticulum / cytoskeletal motor activity / actin filament bundle assembly / skeletal muscle myofibril / striated muscle thin filament / skeletal muscle thin filament assembly / actin monomer binding / photoreceptor outer segment / skeletal muscle fiber development / stress fiber / vesicle-mediated transport / titin binding / actin filament polymerization / myelination / visual perception / secretory granule / protein localization to plasma membrane / actin filament / filopodium / synapse organization / 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 / small GTPase binding / cellular response to insulin stimulus / calcium-dependent protein binding / disordered domain specific binding / melanosome / lamellipodium / actin binding / cell body / chemical synaptic transmission / calmodulin binding / hydrolase activity / postsynapse / protein domain specific binding / neuronal cell body / calcium ion binding / positive regulation of gene expression / glutamatergic synapse / magnesium ion binding / Golgi apparatus / ATP hydrolysis activity / ATP binding / identical protein binding / 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: 4.2 Å | ||||||||||||||||||
![]() | Klebl, D.P. / McMillan, S.N. / Risi, C. / Forgacs, E. / Virok, B. / Atherton, J.L. / Stofella, M. / Winkelmann, D.A. / Sobott, F. / Galkin, V.E. ...Klebl, D.P. / McMillan, S.N. / Risi, C. / Forgacs, E. / Virok, B. / Atherton, J.L. / Stofella, M. / Winkelmann, D.A. / Sobott, F. / Galkin, V.E. / Knight, P.J. / Muench, S.P. / Scarff, C.A. / White, H.D. | ||||||||||||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: Swinging lever mechanism of myosin directly shown by time-resolved cryo-EM. 著者: David P Klebl / Sean N McMillan / Cristina Risi / Eva Forgacs / Betty Virok / Jennifer L Atherton / Sarah A Harris / Michele Stofella / Donald A Winkelmann / Frank Sobott / Vitold E Galkin / ...著者: David P Klebl / Sean N McMillan / Cristina Risi / Eva Forgacs / Betty Virok / Jennifer L Atherton / Sarah A Harris / Michele Stofella / Donald A Winkelmann / Frank Sobott / Vitold E Galkin / Peter J Knight / Stephen P Muench / Charlotte A Scarff / Howard D White / ![]() ![]() ![]() 要旨: Myosins produce force and movement in cells through interactions with F-actin. Generation of movement is thought to arise through actin-catalysed conversion of myosin from an ATP-generated primed ...Myosins produce force and movement in cells through interactions with F-actin. Generation of movement is thought to arise through actin-catalysed conversion of myosin from an ATP-generated primed (pre-powerstroke) state to a post-powerstroke state, accompanied by myosin lever swing. However, the initial, primed actomyosin state has never been observed, and the mechanism by which actin catalyses myosin ATPase activity is unclear. Here, to address these issues, we performed time-resolved cryogenic electron microscopy (cryo-EM) of a myosin-5 mutant having slow hydrolysis product release. Primed actomyosin was predominantly captured 10 ms after mixing primed myosin with F-actin, whereas post-powerstroke actomyosin predominated at 120 ms, with no abundant intermediate states detected. For detailed interpretation, cryo-EM maps were fitted with pseudo-atomic models. Small but critical changes accompany the primed motor binding to actin through its lower 50-kDa subdomain, with the actin-binding cleft open and phosphate release prohibited. Amino-terminal actin interactions with myosin promote rotation of the upper 50-kDa subdomain, closing the actin-binding cleft, and enabling phosphate release. The formation of interactions between the upper 50-kDa subdomain and actin creates the strong-binding interface needed for effective force production. The myosin-5 lever swings through 93°, predominantly along the actin axis, with little twisting. The magnitude of lever swing matches the typical step length of myosin-5 along actin. These time-resolved structures demonstrate the swinging lever mechanism, elucidate structural transitions of the power stroke, and resolve decades of conjecture on how myosins generate movement. | ||||||||||||||||||
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 | ![]() | 334.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 267.7 KB | 表示 | ![]() |
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その他 | ![]() |
-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 | ![]() | 68.8 KB | 表示 | |
CIF形式データ | ![]() | 101.1 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 19030MC ![]() 8r9vC ![]() 8rbgC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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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: 87340.102 Da / 分子数: 1 / 変異: S217A, Deletion DDEK 594-597 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() | ||||||||
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#2: タンパク質 | 分子量: 41888.652 Da / 分子数: 3 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() 参照: UniProt: P68135, 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 #3: 化合物 | ChemComp-MG / #4: 化合物 | ChemComp-ADP / 研究の焦点であるリガンドがあるか | Y | Has protein modification | Y | |
-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: 7 | |||||||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Actin-myosin mixture comprising 13 uM myosin (pre-mixed with ATP) and 13 uM actin vitrified a t120 ms post-mixing | |||||||||||||||||||||||||||||||||||
試料支持 | 詳細: 300 mesh copper grids with copper nano-wires (SPT Labtech) グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil | |||||||||||||||||||||||||||||||||||
急速凍結 | 装置: HOMEMADE PLUNGER / 凍結剤: ETHANE / 湿度: 60 % / 凍結前の試料温度: 293 K 詳細: F-actin was mixed with myosin-5a (S1 1 IQ motif, residues 1-797, S217A, DDEK 594-597 deletion) that had been pre-incubated with ATP, and vitrified at 120 ms post-mixing |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 130000 X / 最大 デフォーカス(公称値): 4100 nm / 最小 デフォーカス(公称値): 2000 nm |
撮影 | 平均露光時間: 7 sec. / 電子線照射量: 56.1 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 QUANTUM (4k x 4k) 撮影したグリッド数: 3 / 実像数: 4976 |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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粒子像の選択 | 選択した粒子像数: 431867 |
3次元再構成 | 解像度: 4.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 94093 / 対称性のタイプ: POINT |