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基本情報
登録情報 | データベース: EMDB / ID: EMD-11525 | |||||||||
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タイトル | Fully-loaded anthrax lethal toxin in its heptameric pre-pore state and PA7LF(2+1A)' arrangement | |||||||||
![]() | PA7LF(2 1A)' | |||||||||
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生物種 | ![]() ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 4.3 Å | |||||||||
![]() | Quentin D / Antoni C / Gatsogiannis C / Raunser S | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM structure of the fully-loaded asymmetric anthrax lethal toxin in its heptameric pre-pore state. 著者: Claudia Antoni / Dennis Quentin / Alexander E Lang / Klaus Aktories / Christos Gatsogiannis / Stefan Raunser / ![]() 要旨: Anthrax toxin is the major virulence factor secreted by Bacillus anthracis, causing high mortality in humans and other mammals. It consists of a membrane translocase, known as protective antigen (PA) ...Anthrax toxin is the major virulence factor secreted by Bacillus anthracis, causing high mortality in humans and other mammals. It consists of a membrane translocase, known as protective antigen (PA), that catalyzes the unfolding of its cytotoxic substrates lethal factor (LF) and edema factor (EF), followed by translocation into the host cell. Substrate recruitment to the heptameric PA pre-pore and subsequent translocation, however, are not well understood. Here, we report three high-resolution cryo-EM structures of the fully-loaded anthrax lethal toxin in its heptameric pre-pore state, which differ in the position and conformation of LFs. The structures reveal that three LFs interact with the heptameric PA and upon binding change their conformation to form a continuous chain of head-to-tail interactions. As a result of the underlying symmetry mismatch, one LF binding site in PA remains unoccupied. Whereas one LF directly interacts with a part of PA called α-clamp, the others do not interact with this region, indicating an intermediate state between toxin assembly and translocation. Interestingly, the interaction of the N-terminal domain with the α-clamp correlates with a higher flexibility in the C-terminal domain of the protein. Based on our data, we propose a model for toxin assembly, in which the relative position of the N-terminal α-helices in the three LFs determines which factor is translocated first. | |||||||||
履歴 |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
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マップデータ | ![]() | 138.1 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 17.5 KB 17.5 KB | 表示 表示 | ![]() |
画像 | ![]() | 153.4 KB | ||
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注釈 | PA7LF(2 1A)' | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.07 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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試料の構成要素
-全体 : Fully-loaded anthrax lethal toxin in its heptameric pre-pore stat...
全体 | 名称: Fully-loaded anthrax lethal toxin in its heptameric pre-pore state and PA7LF(2+1A)' arrangement |
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要素 |
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-超分子 #1: Fully-loaded anthrax lethal toxin in its heptameric pre-pore stat...
超分子 | 名称: Fully-loaded anthrax lethal toxin in its heptameric pre-pore state and PA7LF(2+1A)' arrangement タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Three LF molecules crown the heptameric PA ring. The LFs form a continuous chain of head-to-tail interactions. In the PA7LF(2+1A)' arrangement, the third LF binds with its N-terminal domain ...詳細: Three LF molecules crown the heptameric PA ring. The LFs form a continuous chain of head-to-tail interactions. In the PA7LF(2+1A)' arrangement, the third LF binds with its N-terminal domain to the C-terminal region of the 2nd LF. In addition, two LFs likely interact with each other via their C-terminal regions close to the central axis of the complex. |
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分子量 | 理論値: 93 KDa |
-超分子 #2: Protective antigen
超分子 | 名称: Protective antigen / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1 詳細: The trypsin-activated 63 kDa fragments assemble into a hepatameric pre-pore |
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由来(天然) | 生物種: ![]() ![]() |
組換発現 | 生物種: ![]() ![]() |
-超分子 #3: Lethal factor
超分子 | 名称: Lethal factor / タイプ: complex / ID: 3 / 親要素: 1 / 含まれる分子: #2 詳細: Three LF molecules crown the heptameric PA ring. The LFs form a continuous chain of head-to-tail interactions. In the PA7LF(2+1A) arrangement, the third LF binds with its N-terminal domain to ...詳細: Three LF molecules crown the heptameric PA ring. The LFs form a continuous chain of head-to-tail interactions. In the PA7LF(2+1A) arrangement, the third LF binds with its N-terminal domain to the C-terminus of the 2nd LF. In addition, two LFs likely interact with each other via their C-terminal regions close to the central axis of the complex. |
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由来(天然) | 生物種: ![]() ![]() |
組換発現 | 生物種: ![]() ![]() |
-分子 #1: Protective antigen
分子 | 名称: Protective antigen / 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: ![]() ![]() |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MGHHHHHHHH HHSSGHIDDD DKHMEVKQEN RLLNESESSS QGLLGYYFSD LNFQAPMVVT SSTTGDLSIP SSELENIPSE NQYFQSAIWS GFIKVKKSDE YTFATSADNH VTMWVDDQEV INKASNSNKI RLEKGRLYQI KIQYQRENPT EKGLDFKLYW TDSQNKKEVI ...文字列: MGHHHHHHHH HHSSGHIDDD DKHMEVKQEN RLLNESESSS QGLLGYYFSD LNFQAPMVVT SSTTGDLSIP SSELENIPSE NQYFQSAIWS GFIKVKKSDE YTFATSADNH VTMWVDDQEV INKASNSNKI RLEKGRLYQI KIQYQRENPT EKGLDFKLYW TDSQNKKEVI SSDNLQLPEL KQKSSNSRKK RSTSAGPTVP DRDNDGIPDS LEVEGYTVDV KNKRTFLSPW ISNIHEKKGL TKYKSSPEKW STASDPYSDF EKVTGRIDKN VSPEARHPLV AAYPIVHVDM ENIILSKNED QSTQNTDSQT RTISKNTSTS RTHTSEVHGN AEVHASFFDI GGSVSAGFSN SNSSTVAIDH SLSLAGERTW AETMGLNTAD TARLNANIRY VNTGTAPIYN VLPTTSLVLG KNQTLATIKA KENQLSQILA PNNYYPSKNL APIALNAQDD FSSTPITMNY NQFLELEKTK QLRLDTDQVY GNIATYNFEN GRVRVDTGSN WSEVLPQIQE TTARIIFNGK DLNLVERRIA AVNPSDPLET TKPDMTLKEA LKIAFGFNEP NGNLQYQGKD ITEFDFNFDQ QTSQNIKNQL AELNATNIYT VLDKIKLNAK MNILIRDKRF HYDRNNIAVG ADESVVKEAH REVINSSTEG LLLNIDKDIR KILSGYIVEI EDTEGLKEVI NDRYDMLNIS SLRQDGKTFI DFKKYNDKLP LYISNPNYKV NVYAVTKENT IINPSENGDT STNGIKKILI FSKKGYEIG |
-分子 #2: Lethal factor
分子 | 名称: Lethal factor / タイプ: protein_or_peptide / ID: 2 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() ![]() |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MNIKKEFIKV ISMSCLVTAI TLSGPVFIPL VQGAGGHGDV GMHVKEKEKN KDENKRKDEE RNKTQEEHL KEIMKHIVKI EVKGEEAVKK EAAEKLLEKV PSDVLEMYKA IGGKIYIVDG D ITKHISLE ALSEDKKKIK DIYGKDALLH EHYVYAKEGY EPVLVIQSSE ...文字列: MNIKKEFIKV ISMSCLVTAI TLSGPVFIPL VQGAGGHGDV GMHVKEKEKN KDENKRKDEE RNKTQEEHL KEIMKHIVKI EVKGEEAVKK EAAEKLLEKV PSDVLEMYKA IGGKIYIVDG D ITKHISLE ALSEDKKKIK DIYGKDALLH EHYVYAKEGY EPVLVIQSSE DYVENTEKAL NV YYEIGKI LSRDILSKIN QPYQKFLDVL NTIKNASDSD GQDLLFTNQL KEHPTDFSVE FLE QNSNEV QEVFAKAFAY YIEPQHRDVL QLYAPEAFNY MDKFNEQEIN LSLEELKDQR MLAR YEKWE KIKQHYQHWS DSLSEEGRGL LKKLQIPIEP KKDDIIHSLS QEEKELLKRI QIDSS DFLS TEEKEFLKKL QIDIRDSLSE EEKELLNRIQ VDSSNPLSEK EKEFLKKLKL DIQPYD INQ RLQDTGGLID SPSINLDVRK QYKRDIQNID ALLHQSIGST LYNKIYLYEN MNINNLT AT LGADLVDSTD NTKINRGIFN EFKKNFKYSI SSNYMIVDIN ERPALDNERL KWRIQLSP D TRAGYLENGK LILQRNIGLE IKDVQIIKQS EKEYIRIDAK VVPKSKIDTK IQEAQLNIN QEWNKALGLP KYTKLITFNV HNRYASNIVE SAYLILNEWK NNIQSDLIKK VTNYLVDGNG RFVFTDITL PNIAEQYTHQ DEIYEQVHSK GLYVPESRSI LLHGPSKGVE LRNDSEGFIH E FGHAVDDY AGYLLDKNQS DLVTNSKKFI DIFKEEGSNL TSYGRTNEAE FFAEAFRLMH ST DHAERLK VQKNAPKTFQ FINDQIKFII NS |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 0.06 mg/mL | |||||||||
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緩衝液 | pH: 8.5 構成要素:
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グリッド | モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: CONTINUOUS / 支持フィルム - Film thickness: 2.0 nm / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 雰囲気: AIR | |||||||||
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 286 K / 装置: GATAN CRYOPLUNGE 3 詳細: 4 uL sample was applied to grid (with 2 nm additional carbon layer) and incubated for 45 s prior blotting.. |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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特殊光学系 | エネルギーフィルター - 名称: GIF Bioquantum / エネルギーフィルター - スリット幅: 20 eV |
撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 検出モード: COUNTING / 実像数: 5238 / 平均露光時間: 15.0 sec. / 平均電子線量: 74.4 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 最大 デフォーカス(補正後): 2.6 µm / 最小 デフォーカス(補正後): 1.2 µm / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 倍率(公称値): 130000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER ホルダー冷却材: NITROGEN |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |