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基本情報
登録情報 | データベース: PDB / ID: 3jca | ||||||
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タイトル | Core model of the Mouse Mammary Tumor Virus intasome | ||||||
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機能・相同性 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 類似検索 - 分子機能 | ||||||
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![]() | Lyumkis, D.L. / Ballandras-Colas, A. / Brown, M. / Cook, N.J. / Dewdney, T.G. / Demeler, B. / Cherepanov, P. / Engelman, A.N. | ||||||
![]() | ![]() タイトル: Cryo-EM reveals a novel octameric integrase structure for betaretroviral intasome function. 著者: Allison Ballandras-Colas / Monica Brown / Nicola J Cook / Tamaria G Dewdney / Borries Demeler / Peter Cherepanov / Dmitry Lyumkis / Alan N Engelman / ![]() ![]() 要旨: Retroviral integrase catalyses the integration of viral DNA into host target DNA, which is an essential step in the life cycle of all retroviruses. Previous structural characterization of integrase- ...Retroviral integrase catalyses the integration of viral DNA into host target DNA, which is an essential step in the life cycle of all retroviruses. Previous structural characterization of integrase-viral DNA complexes, or intasomes, from the spumavirus prototype foamy virus revealed a functional integrase tetramer, and it is generally believed that intasomes derived from other retroviral genera use tetrameric integrase. However, the intasomes of orthoretroviruses, which include all known pathogenic species, have not been characterized structurally. Here, using single-particle cryo-electron microscopy and X-ray crystallography, we determine an unexpected octameric integrase architecture for the intasome of the betaretrovirus mouse mammary tumour virus. The structure is composed of two core integrase dimers, which interact with the viral DNA ends and structurally mimic the integrase tetramer of prototype foamy virus, and two flanking integrase dimers that engage the core structure via their integrase carboxy-terminal domains. Contrary to the belief that tetrameric integrase components are sufficient to catalyse integration, the flanking integrase dimers were necessary for mouse mammary tumour virus integrase activity. The integrase octamer solves a conundrum for betaretroviruses as well as alpharetroviruses by providing critical carboxy-terminal domains to the intasome core that cannot be provided in cis because of evolutionarily restrictive catalytic core domain-carboxy-terminal domain linker regions. The octameric architecture of the intasome of mouse mammary tumour virus provides new insight into the structural basis of retroviral DNA integration. | ||||||
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構造の表示
ムービー |
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構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 292.4 KB | 表示 | ![]() |
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-関連構造データ
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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: 30034.287 Da / 分子数: 4 / 断片: UNP residues 1437-1701 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() プラスミド: pET15b / 発現宿主: ![]() ![]() ![]() #2: タンパク質・ペプチド | ![]() 分子量: 5571.474 Da / 分子数: 4 / 断片: C-terminal domain (UNP residues 1653-1701) / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() プラスミド: pET15b / 発現宿主: ![]() ![]() ![]() #3: DNA鎖 | 分子量: 6738.343 Da / 分子数: 2 / 由来タイプ: 合成 / 詳細: pre-cleaved viral DNA 3' strand 由来: (合成) ![]() ![]() #4: DNA鎖 | 分子量: 6160.968 Da / 分子数: 2 / 由来タイプ: 合成 / 詳細: pre-cleaved viral DNA 5' strand 由来: (合成) ![]() ![]() #5: 化合物 | ChemComp-ZN / |
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-実験情報
-実験
実験 | 手法: ![]() |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: ![]() |
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試料調製
構成要素 |
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分子量 | 値: 2 MDa / 実験値: NO | ||||||||||||||||||||
緩衝液 | 名称: size-exclusion buffer / pH: 7.4 / 詳細: size-exclusion buffer | ||||||||||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色![]() ![]() | ||||||||||||||||||||
試料支持 | 詳細: 400 mesh C-flat 1.2/1.3-4C, plasma-treated for 6 seconds | ||||||||||||||||||||
急速凍結![]() | 装置: HOMEMADE PLUNGER / 凍結剤: ETHANE / Temp: 77 K / 湿度: 90 % 詳細: Sample containing MMTV intasomes in SEC buffer (to which the detergent NP-40 was added to a final concentration of 0.05%) was applied onto a freshly plasma-treated (6s, Gatan Solarus plasma ...詳細: Sample containing MMTV intasomes in SEC buffer (to which the detergent NP-40 was added to a final concentration of 0.05%) was applied onto a freshly plasma-treated (6s, Gatan Solarus plasma cleaner) holey carbon C-flat grid (CF-1.2/1.3-4C, Protochips, Inc.), allowing the sample to adsorb for 30 seconds and then plunge-freezing in liquid ethane using a manual cryo-plunger in an ambient environment of 4 degrees C. 手法: 3 uL sample was applied to grid, adsorbed for 30 seconds, blotted, and plunge-frozen in liquid ethane. |
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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 / 日付: 2015年4月15日 |
電子銃 | 電子線源![]() ![]() |
電子レンズ | モード: BRIGHT FIELD![]() ![]() 非点収差 ![]() |
試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 40 e/Å2 / フィルム・検出器のモデル: GATAN K2 (4k x 4k) |
画像スキャン | デジタル画像の数: 2714 |
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解析
EMソフトウェア |
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CTF補正![]() | 詳細: each particle | ||||||||||||||||||||||||||||
対称性 | 点対称性![]() ![]() | ||||||||||||||||||||||||||||
3次元再構成![]() | 手法: projection matching / 解像度: 4.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 30307 / ピクセルサイズ(公称値): 1.31 Å / ピクセルサイズ(実測値): 1.31 Å 詳細: Local FSC values range from 4-5 A. (Single particle details: IN-NTD and IN-CCD domains of flanking INs 5-8 were computationally removed using Relion after assignment of Euler angles to full ...詳細: Local FSC values range from 4-5 A. (Single particle details: IN-NTD and IN-CCD domains of flanking INs 5-8 were computationally removed using Relion after assignment of Euler angles to full octameric particles and masking out of flanking regions.) (Single particle - Applied symmetry: C2) 対称性のタイプ: POINT | ||||||||||||||||||||||||||||
原子モデル構築 | B value: 300 / プロトコル: OTHER / 空間: REAL / Target criteria: FSC, Rosetta energy 詳細: REFINEMENT PROTOCOL--real-space refinement DETAILS--Initial components solved by X-ray were rigid-body docked. Linker regions were built de novo from the EM density. The full model was ...詳細: REFINEMENT PROTOCOL--real-space refinement DETAILS--Initial components solved by X-ray were rigid-body docked. Linker regions were built de novo from the EM density. The full model was refined using real-space methods in Rosetta. | ||||||||||||||||||||||||||||
原子モデル構築 |
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精密化ステップ | サイクル: LAST
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