+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-20719 | |||||||||
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タイトル | Bare actin from partially cofilin-decorated actin filaments | |||||||||
マップデータ | Unmasked final map of bare actin from partially cofilin-decorated actin filaments. This map was sharpened with a B-factor of -235. | |||||||||
試料 |
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機能・相同性 | 機能・相同性情報 cytoskeletal motor activator activity / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / actin filament bundle / filamentous actin / actin filament bundle assembly / skeletal muscle thin filament assembly / striated muscle thin filament ...cytoskeletal motor activator activity / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / actin filament bundle / filamentous actin / actin filament bundle assembly / skeletal muscle thin filament assembly / striated muscle thin filament / skeletal muscle myofibril / actin monomer binding / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / マイクロフィラメント / 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 / calcium-dependent protein binding / lamellipodium / cell body / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein binding / 細胞質 類似検索 - 分子機能 | |||||||||
生物種 | Oryctolagus cuniculus (ウサギ) | |||||||||
手法 | らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 3.5 Å | |||||||||
データ登録者 | Huehn AR / Bibeau JP / Schramm AC / Cao W / De La Cruz EM / Sindelar CV | |||||||||
資金援助 | 米国, 2件
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引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2020 タイトル: Structures of cofilin-induced structural changes reveal local and asymmetric perturbations of actin filaments. 著者: Andrew R Huehn / Jeffrey P Bibeau / Anthony C Schramm / Wenxiang Cao / Enrique M De La Cruz / Charles V Sindelar / 要旨: Members of the cofilin/ADF family of proteins sever actin filaments, increasing the number of filament ends available for polymerization or depolymerization. Cofilin binds actin filaments with ...Members of the cofilin/ADF family of proteins sever actin filaments, increasing the number of filament ends available for polymerization or depolymerization. Cofilin binds actin filaments with positive cooperativity, forming clusters of contiguously bound cofilin along the filament lattice. Filament severing occurs preferentially at boundaries between bare and cofilin-decorated (cofilactin) segments and is biased at 1 side of a cluster. A molecular understanding of cooperative binding and filament severing has been impeded by a lack of structural data describing boundaries. Here, we apply methods for analyzing filament cryo-electron microscopy (cryo-EM) data at the single subunit level to directly investigate the structure of boundaries within partially decorated cofilactin filaments. Subnanometer resolution maps of isolated, bound cofilin molecules and an actin-cofilactin boundary indicate that cofilin-induced actin conformational changes are local and limited to subunits directly contacting bound cofilin. An isolated, bound cofilin compromises longitudinal filament contacts of 1 protofilament, consistent with a single cofilin having filament-severing activity. An individual, bound phosphomimetic (S3D) cofilin with weak severing activity adopts a unique binding mode that does not perturb actin structure. Cofilin clusters disrupt both protofilaments, consistent with a higher severing activity at boundaries compared to single cofilin. Comparison of these structures indicates that this disruption is substantially greater at pointed end sides of cofilactin clusters than at the barbed end. These structures, with the distribution of bound cofilin clusters, suggest that maximum binding cooperativity is achieved when 2 cofilins occupy adjacent sites. These results reveal the structural origins of cooperative cofilin binding and actin filament severing. | |||||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_20719.map.gz | 38.2 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-20719-v30.xml emd-20719.xml | 14.8 KB 14.8 KB | 表示 表示 | EMDBヘッダ |
FSC (解像度算出) | emd_20719_fsc.xml | 7.8 KB | 表示 | FSCデータファイル |
画像 | emd_20719.png | 39 KB | ||
マスクデータ | emd_20719_msk_1.map | 40.6 MB | マスクマップ | |
その他 | emd_20719_half_map_1.map.gz emd_20719_half_map_2.map.gz | 7.2 MB 7.3 MB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-20719 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-20719 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_20719.map.gz / 形式: CCP4 / 大きさ: 40.6 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Unmasked final map of bare actin from partially cofilin-decorated actin filaments. This map was sharpened with a B-factor of -235. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.332 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
-マスク #1
ファイル | emd_20719_msk_1.map | ||||||||||||
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投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Symmetrized half map (1/2) of bare actin from...
ファイル | emd_20719_half_map_1.map | ||||||||||||
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注釈 | Symmetrized half map (1/2) of bare actin from partially cofilin-decorated actin filaments. | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Symmetrized half map (2/2) of bare actin from...
ファイル | emd_20719_half_map_2.map | ||||||||||||
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注釈 | Symmetrized half map (2/2) of bare actin from partially cofilin-decorated actin filaments. | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-試料の構成要素
-全体 : Complex of rabbit skeletal actin with human cofilin-1
全体 | 名称: Complex of rabbit skeletal actin with human cofilin-1 |
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要素 |
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-超分子 #1: Complex of rabbit skeletal actin with human cofilin-1
超分子 | 名称: Complex of rabbit skeletal actin with human cofilin-1 タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all |
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-超分子 #2: Rabbit Skeletal Actin
超分子 | 名称: Rabbit Skeletal Actin / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: all |
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由来(天然) | 生物種: Oryctolagus cuniculus (ウサギ) |
-分子 #1: Rabbit skeletal actin
分子 | 名称: Rabbit skeletal actin / タイプ: protein_or_peptide / ID: 1 / 光学異性体: LEVO |
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由来(天然) | 生物種: Oryctolagus cuniculus (ウサギ) |
配列 | 文字列: MCDEDETTAL VCDNGSGLVK AGFAGDDAPR AVFPSIVGRP RHQGVMVGMG QKDSYVGDEA QSKRGILTL KYPIEHGIIT NWDDMEKIWH HTFYNELRVA PEEHPTLLTE APLNPKANRE K MTQIMFET FNVPAMYVAI QAVLSLYASG RTTGIVLDSG DGVTHNVPIY ...文字列: MCDEDETTAL VCDNGSGLVK AGFAGDDAPR AVFPSIVGRP RHQGVMVGMG QKDSYVGDEA QSKRGILTL KYPIEHGIIT NWDDMEKIWH HTFYNELRVA PEEHPTLLTE APLNPKANRE K MTQIMFET FNVPAMYVAI QAVLSLYASG RTTGIVLDSG DGVTHNVPIY EGYALPHAIM RL DLAGRDL TDYLMKILTE RGYSFVTTAE REIVRDIKEK LCYVALDFEN EMATAASSSS LEK SYELPD GQVITIGNER FRCPETLFQP SFIGMESAGI HETTYNSIMK CDIDIRKDLY ANNV MSGGT TMYPGIADRM QKEITALAPS TMKIKIIAPP ERKYSVWIGG SILASLSTFQ QMWIT KQEY DEAGPSIVHR KCF |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | らせん対称体再構成法 |
試料の集合状態 | helical array |
-試料調製
緩衝液 | pH: 6.6 |
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凍結 | 凍結剤: ETHANE / 装置: HOMEMADE PLUNGER |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: SPOT SCAN / 撮影モード: BRIGHT FIELDBright-field microscopy |
撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 50.0 e/Å2 |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |