- EMDB-5696: Electron cryo-microscopy of human cytomegalovirus virion -
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基本情報
登録情報
データベース: EMDB / ID: EMD-5696
タイトル
Electron cryo-microscopy of human cytomegalovirus virion
マップデータ
Reconstruction of human cytomegalovirus (HCMV) virion. Only the icosahedral capsid and orderly bound tegument proteins are visible in the density map. Other tegument proteins and the envelope are amorphous and thus not visible.
試料
試料: Human cytomegalovirus (HCMV) virion
ウイルス: Human herpesvirus 5 (ヘルペスウイルス)
キーワード
herpesvirus / betaherpesvirus / human cytomegalovirus
ジャーナル: PLoS Pathog / 年: 2013 タイトル: The smallest capsid protein mediates binding of the essential tegument protein pp150 to stabilize DNA-containing capsids in human cytomegalovirus. 著者: Xinghong Dai / Xuekui Yu / Hao Gong / Xiaohong Jiang / Gerrado Abenes / Hongrong Liu / Sakar Shivakoti / William J Britt / Hua Zhu / Fenyong Liu / Z Hong Zhou / 要旨: Human cytomegalovirus (HCMV) is a ubiquitous herpesvirus that causes birth defects in newborns and life-threatening complications in immunocompromised individuals. Among all human herpesviruses, HCMV ...Human cytomegalovirus (HCMV) is a ubiquitous herpesvirus that causes birth defects in newborns and life-threatening complications in immunocompromised individuals. Among all human herpesviruses, HCMV contains a much larger dsDNA genome within a similarly-sized capsid compared to the others, and it was proposed to require pp150, a tegument protein only found in cytomegaloviruses, to stabilize its genome-containing capsid. However, little is known about how pp150 interacts with the underlying capsid. Moreover, the smallest capsid protein (SCP), while dispensable in herpes simplex virus type 1, was shown to play essential, yet undefined, role in HCMV infection. Here, by cryo electron microscopy (cryoEM), we determine three-dimensional structures of HCMV capsid (no pp150) and virion (with pp150) at sub-nanometer resolution. Comparison of these two structures reveals that each pp150 tegument density is composed of two helix bundles connected by a long central helix. Correlation between the resolved helices and sequence-based secondary structure prediction maps the tegument density to the N-terminal half of pp150. The structures also show that SCP mediates interactions between the capsid and pp150 at the upper helix bundle of pp150. Consistent with this structural observation, ribozyme inhibition of SCP expression in HCMV-infected cells impairs the formation of DNA-containing viral particles and reduces viral yield by 10,000 fold. By cryoEM reconstruction of the resulting "SCP-deficient" viral particles, we further demonstrate that SCP is required for pp150 functionally binding to the capsid. Together, our structural and biochemical results point to a mechanism whereby SCP recruits pp150 to stabilize genome-containing capsid for the production of infectious HCMV virion.
ダウンロード / ファイル: emd_5696.map.gz / 形式: CCP4 / 大きさ: 976.6 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Reconstruction of human cytomegalovirus (HCMV) virion. Only the icosahedral capsid and orderly bound tegument proteins are visible in the density map. Other tegument proteins and the envelope are amorphous and thus not visible.
凍結剤: ETHANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK IV / 手法: Blot force = 0, blot time = 20s
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
温度
平均: 80 K
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected at 135,000 times magnification. Astigmatism correction was also carried out for each particle during the data processing.