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基本情報
登録情報 | データベース: PDB / ID: 1m0f | ||||||
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タイトル | Structural Studies of Bacteriophage alpha3 Assembly, Cryo-electron microscopy | ||||||
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![]() | VIRUS / Bacteriophage / Cryo Electron Microscopy / Procapsid / morphogenesis / microviridae / assembly / Icosahedral virus | ||||||
機能・相同性 | ![]() viral procapsid maturation / T=1 icosahedral viral capsid / viral capsid / host cell cytoplasm / symbiont entry into host cell / virion attachment to host cell / structural molecule activity 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: 16 Å | ||||||
![]() | Bernal, R.A. / Hafenstein, S. / Olson, N.H. / Bowman, V.D. / Chipman, P.R. / Baker, T.S. / Fane, B.A. / Rossmann, M.G. | ||||||
![]() | ![]() タイトル: Structural studies of bacteriophage alpha3 assembly. 著者: Ricardo A Bernal / Susan Hafenstein / Norman H Olson / Valorie D Bowman / Paul R Chipman / Timothy S Baker / Bentley A Fane / Michael G Rossmann / ![]() 要旨: Bacteriophage alpha3 is a member of the Microviridae, a family of small, single-stranded, icosahedral phages that include phiX174. These viruses have an ssDNA genome associated with approximately 12 ...Bacteriophage alpha3 is a member of the Microviridae, a family of small, single-stranded, icosahedral phages that include phiX174. These viruses have an ssDNA genome associated with approximately 12 copies of an H pilot protein and 60 copies of a small J DNA-binding protein. The surrounding capsid consists of 60 F coat proteins decorated with 12 pentameric spikes of G protein. Assembly proceeds via a 108S empty procapsid that requires the external D and internal B scaffolding proteins for its formation. The alpha3 "open" procapsid structural intermediate was determined to 15A resolution by cryo-electron microscopy (cryo-EM). Unlike the phiX174 "closed" procapsid and the infectious virion, the alpha3 open procapsid has 30A wide pores at the 3-fold vertices and 20A wide gaps between F pentamers as a result of the disordering of two helices in the F capsid protein. The large pores are probably used for DNA entry and internal scaffolding protein exit during DNA packaging. Portions of the B scaffolding protein are located at the 5-fold axes under the spike and in the hydrophobic pocket on the inner surface of the capsid. Protein B appears to have autoproteolytic activity that cleaves at an Arg-Phe motif and probably facilitates the removal of the protein through the 30A wide pores. The structure of the alpha3 mature virion was solved to 3.5A resolution by X-ray crystallography and was used to interpret the open procapsid cryo-EM structure. The main differences between the alpha3 and phiX174 virion structures are in the spike and the DNA-binding proteins. The alpha3 pentameric spikes have a rotation of 3.5 degrees compared to those of phiX174. The alpha3 DNA-binding protein, which is shorter by 13 amino acid residues at its amino end when compared to the phiX174 J protein, retains its carboxy-terminal-binding site on the internal surface of the capsid protein. The icosahedrally ordered structural component of the ssDNA appears to be substantially increased in alpha3 compared to phiX174, allowing the building of about 10% of the ribose-phosphate backbone. | ||||||
履歴 |
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Remark 999 | SEQUENCE Residue 160 of the F protein is an ARG according to the reported sequence but no density ...SEQUENCE Residue 160 of the F protein is an ARG according to the reported sequence but no density is seen for the side chain in the crystal structure for this residue. After a structural sequence alignment with homologous bacteriophages phix174 and G4, residue 160 was found to be a glycine in the other phages. Consequently, the authors state residue 160 should be a Glycine. CHAINS 1,2,3,4 ARE SCAFFOLDING PROTEIN D AND CHAIN B IS SCAFFOLDING PROTEIN B, ALL FROM BACTERIOPHAGE ALPHA3. THE PROTEIN SEQUENCES WERE TAKEN FROM 1CD3 PHIX174 COORDINATES AND FITTED INTO THE CRYO-EM STRUCTURE. THE SEQUENCE DATABASE REFERENCE FOR THE PHIX174 SCAFFOLDING PROTEINS D AND B ARE P03637 AND P07929 RESPECTIVELY. |
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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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-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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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: 16953.316 Da / 分子数: 4 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 属: Microvirus / 発現宿主: ![]() ![]() #2: タンパク質 | | 分子量: 49294.277 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 属: Microvirus / 発現宿主: ![]() ![]() #3: タンパク質 | | 分子量: 19598.990 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 属: Microvirus / 発現宿主: ![]() ![]() #4: タンパク質 | | 分子量: 8150.042 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 属: Microvirus / 発現宿主: ![]() ![]() |
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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 | 名称: Procapsid of the bacteriophage alpha3 / タイプ: VIRUS |
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ウイルスについての詳細 | 詳細: Assembly intermediate called the Procapsid / ホストのカテゴリ: BACTERIA(EUBACTERIA) / 単離: SPECIES |
天然宿主 | 生物種: Escherichia coli / 株: slyD |
緩衝液 | 名称: 10 mM Tris and 1 mM EDTA / pH: 7.5 / 詳細: 10 mM Tris and 1 mM EDTA |
試料 | 濃度: 8 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
結晶化 | *PLUS 手法: other / 詳細: cryo-electron microscopy |
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電子顕微鏡撮影
顕微鏡 | モデル: FEI/PHILIPS CM200FEG/ST / 日付: 1998年10月16日 |
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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): 38000 X / 倍率(補正後): 40000 X / 最大 デフォーカス(公称値): 1600 nm / 最小 デフォーカス(公称値): 3200 nm / Cs: 2 mm |
試料ホルダ | 温度: 88 K / 傾斜角・最大: 0 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 0.017 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
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解析
EMソフトウェア |
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CTF補正 | 詳細: CTF correction was done for each particle. | |||||||||||||||||||||
対称性 | 点対称性: I (正20面体型対称) | |||||||||||||||||||||
3次元再構成 | 手法: Model based polar fourier transform (Projection matching). 解像度: 16 Å / 粒子像の数: 2378 / ピクセルサイズ(公称値): 1.84 Å / ピクセルサイズ(実測値): 1.75 Å 倍率補正: Magnification correction was determined using the F pentamer as found in the mature virion of alpha3 and phix174 and in the closed procapsid as a control. Symmetry related contacts in ...倍率補正: Magnification correction was determined using the F pentamer as found in the mature virion of alpha3 and phix174 and in the closed procapsid as a control. Symmetry related contacts in the control were found to be 6.3% of all atoms. The pixel size of the reconstruction was adjusted so as to obtain the same number of contacts. 詳細: 2378 particles were included in the final reconstruction. The effective resolution is 15.0-16.0A. Higher resolution was not possible because of the tendency of particles to orient themselves ...詳細: 2378 particles were included in the final reconstruction. The effective resolution is 15.0-16.0A. Higher resolution was not possible because of the tendency of particles to orient themselves non-randomly. Only CA coordinates are presented in the entry. 対称性のタイプ: POINT | |||||||||||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL Target criteria: Best fit criterion used by the program EMfit is based on the average value of the density at all atomic sites in the fitted protein, the lack of atoms in negative density, and the ...Target criteria: Best fit criterion used by the program EMfit is based on the average value of the density at all atomic sites in the fitted protein, the lack of atoms in negative density, and the absence of symmetry related atomic clashes. 詳細: METHOD--General search followed by a climb procedure REFINEMENT PROTOCOL--rigid molecule fit using the program EMfit | |||||||||||||||||||||
原子モデル構築 |
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精密化 | 最高解像度: 16 Å | |||||||||||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 16 Å
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