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.
試料ホルダー: Side entry cryostage / 試料ホルダーモデル: GATAN LIQUID NITROGEN
実験機器
モデル: Tecnai F20 / 画像提供: FEI Company
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画像解析
詳細
Particles selected using template-based selection, then manually checked. Particles were centered using EMAN cenalignint before reconstruction.
CTF補正
詳細: Each micrograph
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 6.8 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, then low-pass filtered. 使用した粒子像数: 31422