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基本情報
登録情報 | データベース: PDB / ID: 2fte | ||||||
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タイトル | Bacteriophage HK97 Expansion Intermediate IV | ||||||
![]() | major capsid protein | ||||||
![]() | VIRUS/VIRAL PROTEIN / Bacteriophage / HK97 / capsid protein / expansion intermediate / VIRUS-VIRAL PROTEIN COMPLEX | ||||||
機能・相同性 | : / Phage capsid / Phage capsid family / viral procapsid maturation / T=7 icosahedral viral capsid / viral capsid / identical protein binding / Major capsid protein![]() | ||||||
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: 12 Å | ||||||
![]() | Gan, L. / Speir, J.A. / Conway, J.F. / Lander, G. / Cheng, N. / Firek, B.A. / Hendrix, R.W. / Duda, R.L. / Liljas, L. / Johnson, J.E. | ||||||
![]() | ![]() タイトル: Capsid conformational sampling in HK97 maturation visualized by X-ray crystallography and cryo-EM. 著者: Lu Gan / Jeffrey A Speir / James F Conway / Gabriel Lander / Naiqian Cheng / Brian A Firek / Roger W Hendrix / Robert L Duda / Lars Liljas / John E Johnson / ![]() 要旨: Maturation of the bacteriophage HK97 capsid from a precursor (Prohead II) to the mature state (Head II) involves a 60 A radial expansion. The mature particle is formed by 420 copies of the major ...Maturation of the bacteriophage HK97 capsid from a precursor (Prohead II) to the mature state (Head II) involves a 60 A radial expansion. The mature particle is formed by 420 copies of the major capsid protein organized on a T = 7 laevo lattice with each subunit covalently crosslinked to two neighbors. Well-characterized pH 4 expansion intermediates make HK97 valuable for investigating quaternary structural dynamics. Here, we use X-ray crystallography and cryo-EM to demonstrate that in the final transition in maturation (requiring neutral pH), pentons in Expansion Intermediate IV (EI-IV) reversibly sample 14 A translations and 6 degrees rotations relative to a fixed hexon lattice. The limit of this trajectory corresponds to the Head II conformation that is secured at this extent only by the formation of the final class of covalent crosslinks. Mutants that cannot crosslink or EI-IV particles that have been rendered incapable of forming the final crosslink remain in the EI-IV state. #1: ジャーナル: Mol Cell / 年: 2004 タイトル: Control of crosslinking by quaternary structure changes during bacteriophage HK97 maturation. 著者: Lu Gan / James F Conway / Brian A Firek / Naiqian Cheng / Roger W Hendrix / Alasdair C Steven / John E Johnson / Robert L Duda / ![]() 要旨: Radical structural changes drive the maturation of the capsid of HK97, a lambda-like, dsDNA bacteriophage of Escherichia coli. These include expansion from approximately 560 to approximately 660 A in ...Radical structural changes drive the maturation of the capsid of HK97, a lambda-like, dsDNA bacteriophage of Escherichia coli. These include expansion from approximately 560 to approximately 660 A in diameter, metamorphosis from a round to an angular shape, and formation of covalent crosslinks between adjacent capsomers. Analogous transformations also occur in unrelated viruses and protein complexes. We find that expansion and crosslinking happen concurrently during maturation at low pH. Expansion causes residues on three different subunits to move up to 35 A to form 420 active sites that each catalyze the formation of a lysine-asparagine crosslink between adjacent subunits, making crosslink formation an indirect reporter of structural change. Intermediate crosslinking patterns support a previously proposed model of expansion, while hydrophobic properties aid in distinguishing discrete intermediates. A structure derived from cryo-EM images reveals the free intermediate conformation of penton arms, supporting our model for coordinated movement of hexons and pentons on the capsid lattice. | ||||||
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構造ビューア | 分子: ![]() ![]() |
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集合体
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対称性 | 点対称性: (ヘルマン・モーガン記号: 532 / シェーンフリース記号: I (正20面体型対称)) |
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要素
#1: タンパク質 | 分子量: 30804.607 Da / 分子数: 7 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 属: Lambda-like viruses / 遺伝子: 5 / プラスミド: pT7-Hd2.9 / 生物種 (発現宿主): Escherichia coli / 発現宿主: ![]() ![]() Has protein modification | N | |
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-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: PARTICLE / 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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ウイルスについての詳細 | ホストのカテゴリ: BACTERIA(EUBACTERIA) / 単離: SPECIES / タイプ: VIRUS-LIKE PARTICLE | |||||||||||||||
天然宿主 | 生物種: Escherichia coli | |||||||||||||||
緩衝液 | 名称: 50mM Citric Acid pH 4.0, 200mM KCl / pH: 4 / 詳細: 50mM Citric Acid pH 4.0, 200mM KCl | |||||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
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電子顕微鏡撮影
顕微鏡 | モデル: FEI/PHILIPS CM200FEG |
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電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 50000 X |
撮影 | 電子線照射量: 15 e/Å2 |
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解析
EMソフトウェア |
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対称性 | 点対称性: I (正20面体型対称) | ||||||||||||
3次元再構成 | 解像度: 12 Å / ピクセルサイズ(公称値): 1.4 Å 詳細: THE ENTIRE STRUCTURE WAS MODELED AS ALA AND GLY. THE MISSING ATOMS ARE SUPPRESSED DUE TO TOO MANY TO LIST. RESIDUES 159 to 172 IN CHAIN G WERE DELETED DUE TO DISORDER. 対称性のタイプ: POINT | ||||||||||||
原子モデル構築 | B value: 374 / プロトコル: RIGID BODY FIT / 空間: RECIPROCAL Target criteria: vector reciprocal space target and manual correction with O 詳細: METHOD--Rigid body and manual fitting REFINEMENT PROTOCOL--rigid body, magnification optimized using van der Waals constraints and real-space correlation coefficient | ||||||||||||
原子モデル構築 | PDB-ID: 2FSY Accession code: 2FSY / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化ステップ | サイクル: LAST
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