#1: ジャーナル: Proc Natl Acad Sci U S A / 年: 2004 タイトル: The structure of a thermophilic archaeal virus shows a double-stranded DNA viral capsid type that spans all domains of life. 著者: George Rice / Liang Tang / Kenneth Stedman / Francisco Roberto / Josh Spuhler / Eric Gillitzer / John E Johnson / Trevor Douglas / Mark Young / 要旨: Of the three domains of life (Eukarya, Bacteria, and Archaea), the least understood is Archaea and its associated viruses. Many Archaea are extremophiles, with species that are capable of growth at ...Of the three domains of life (Eukarya, Bacteria, and Archaea), the least understood is Archaea and its associated viruses. Many Archaea are extremophiles, with species that are capable of growth at some of the highest temperatures and extremes of pH of all known organisms. Phylogenetic rRNA-encoding DNA analysis places many of the hyperthermophilic Archaea (species with an optimum growth > or = 80 degrees C) at the base of the universal tree of life, suggesting that thermophiles were among the first forms of life on earth. Very few viruses have been identified from Archaea as compared to Bacteria and Eukarya. We report here the structure of a hyperthermophilic virus isolated from an archaeal host found in hot springs in Yellowstone National Park. The sequence of the circular double-stranded DNA viral genome shows that it shares little similarity to other known genes in viruses or other organisms. By comparing the tertiary and quaternary structures of the coat protein of this virus with those of a bacterial and an animal virus, we find conformational relationships among all three, suggesting that some viruses may have a common ancestor that precedes the division into three domains of life >3 billion years ago.
SHEET THE SHEET STRUCTURE OF THIS MOLECULE IS BIFURCATED. IN ORDER TO REPRESENT THIS FEATURE IN ... SHEET THE SHEET STRUCTURE OF THIS MOLECULE IS BIFURCATED. IN ORDER TO REPRESENT THIS FEATURE IN THE SHEET RECORDS BELOW, TWO SHEETS ARE DEFINED.
THE ANNOTATION FOR THIS ENTRY IS PREDICTED FROM THECRYSTAL STRUCTURE. HOWEVER, THE AUTHORS OF THIS ENTRYARE CURRENTLY INVESIGATING THE QUATERNARY STATE OFTHIS MOLECULE BY EXPERIMENTAL METHODS.
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要素
#1: タンパク質
A197
分子量: 24317.412 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) SULFOLOBUS TURRETED ICOSAHEDRAL VIRUS (ウイルス) 株: ISOLATE YNPRC179 解説: STIV WAS ISOLATED FROM SULFOLOBUS SPECIES IN ACIDIC HOT SPRINGS (PH 2.9-3.9, 72-92 DEGREES C) IN THE RABBIT CREEK THERMAL AREA WITHIN MIDWAY GEYSER BASIN IN YELLOWSTONE NATIONAL PARK プラスミド: PEXP14-STIVA197 / 発現宿主: ESCHERICHIA COLI (大腸菌) / 株 (発現宿主): B834(DE3)PLYSS / 参照: UniProt: Q6Q0L5
C-TERMINAL 6XHIS TAG WAS ADDED DURING CLONING, SELENOMETHIONINES IN PLACE OF METHIONINES
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実験情報
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実験
実験
手法: X線回折 / 使用した結晶の数: 1
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試料調製
結晶
マシュー密度: 2 Å3/Da / 溶媒含有率: 37 %
結晶化
手法: 蒸気拡散法, ハンギングドロップ法 / pH: 6.5 詳細: HANGING DROP VAPOR DIFFUSION IN 0.1 M MES(PH 6.5), 1.4 M (NH4)2SO4, 10% 1,4-DIOXANE; THEN CRYOPROTECTED BY A QUICK SOAK IN MOTHER LIQUOR PLUS 25% GLUCOSE.
解像度: 1.86→30 Å / Num. obs: 15646 / % possible obs: 95.5 % / Observed criterion σ(I): 3 / 冗長度: 8.6 % / Rmerge(I) obs: 0.05 / Net I/σ(I): 18.2
反射 シェル
解像度: 1.86→1.93 Å / 冗長度: 8.5 % / Rmerge(I) obs: 0.18 / Mean I/σ(I) obs: 4.1 / % possible all: 99.1
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解析
ソフトウェア
名称
バージョン
分類
REFMAC
5.2.0005
精密化
HKL-2000
データ削減
HKL-2000
データスケーリング
SOLVE
位相決定
精密化
構造決定の手法: 多波長異常分散 / 解像度: 1.86→28.26 Å / Cor.coef. Fo:Fc: 0.955 / Cor.coef. Fo:Fc free: 0.939 / SU B: 5.369 / SU ML: 0.082 / TLS residual ADP flag: LIKELY RESIDUAL / 交差検証法: THROUGHOUT / ESU R: 0.153 / ESU R Free: 0.134 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. TLS MOTION DETERMINATION SERVER (PAINTER & MERRITT (2005) ACTA CRYST. D61, 465-471) WAS USED FOR SELECTION OF OPTIMAL TLS GROUPS USED IN ...詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. TLS MOTION DETERMINATION SERVER (PAINTER & MERRITT (2005) ACTA CRYST. D61, 465-471) WAS USED FOR SELECTION OF OPTIMAL TLS GROUPS USED IN FINAL REFINEMENT. AMINO ACIDS 139 TO 147 WERE NOT MODELED DUE TO THE ABSENCE OF INTERPRETABLE ELECTRON DENSITY.
Rfactor
反射数
%反射
Selection details
Rfree
0.204
768
4.9 %
RANDOM
Rwork
0.171
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obs
0.172
14813
95.5 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: BABINET MODEL WITH MASK