ジャーナル: Structure / 年: 2008 タイトル: Bacteriophage lambda stabilization by auxiliary protein gpD: timing, location, and mechanism of attachment determined by cryo-EM. 著者: Gabriel C Lander / Alex Evilevitch / Meerim Jeembaeva / Clinton S Potter / Bridget Carragher / John E Johnson / 要旨: We report the cryo-EM structure of bacteriophage lambda and the mechanism for stabilizing the 20-A-thick capsid containing the dsDNA genome. The crystal structure of the HK97 bacteriophage capsid ...We report the cryo-EM structure of bacteriophage lambda and the mechanism for stabilizing the 20-A-thick capsid containing the dsDNA genome. The crystal structure of the HK97 bacteriophage capsid fits most of the T = 7 lambda particle density with only minor adjustment. A prominent surface feature at the 3-fold axes corresponds to the cementing protein gpD, which is necessary for stabilization of the capsid shell. Its position coincides with the location of the covalent cross-link formed in the docked HK97 crystal structure, suggesting an evolutionary replacement of this gene product in lambda by autocatalytic chemistry in HK97. The crystal structure of the trimeric gpD, in which the 14 N-terminal residues required for capsid binding are disordered, fits precisely into the corresponding EM density. The N-terminal residues of gpD are well ordered in the cryo-EM density, adding a strand to a beta-sheet formed by the capsid proteins and explaining the mechanism of particle stabilization.
A: 867.84 Å / B: 867.84 Å / C: 433.92 Å α=β=γ: 90 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
2.26
2.26
2.26
M x/y/z
384
384
192
origin x/y/z
0.000
0.000
0.000
length x/y/z
867.840
867.840
433.920
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
49
49
49
NX/NY/NZ
96
96
96
MAP C/R/S
1
2
3
start NC/NR/NS
-192
-192
-96
NC/NR/NS
384
384
192
D min/max/mean
-4.974
18.814
0.332
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添付データ
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試料の構成要素
-
全体 : lambda procapsid
全体
名称: lambda procapsid
要素
試料: lambda procapsid
ウイルス: Enterobacteria phage lambda (λファージ)
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超分子 #1000: lambda procapsid
超分子
名称: lambda procapsid / タイプ: sample / ID: 1000 詳細: particles were present in a preparation of a 37.7 kbp packaging lambda mutant 集合状態: icosahedral / Number unique components: 1
particles selected using a template-based algorithm, then centered using EMAN cenalignint
CTF補正
詳細: phases of each particle flipped using values estimated automatically from the micrograph
最終 再構成
想定した対称性 - 点群: I (正20面体型対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 14.5 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: EMAN 詳細: Amplitudes of final reconstruction adjusted using SPIDER to fit the density Fourier amplitudes to an experimental 1D low-angle X-ray scattering curve 使用した粒子像数: 4640