- EMDB-5697: Electron cryo-microscopy of human cytomegalovirus SCP-deficient p... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-5697
タイトル
Electron cryo-microscopy of human cytomegalovirus SCP-deficient particles
マップデータ
Reconstruction of human cytomegalovirus (HCMV) SCP-deficient particles. The viral particles were harvested from cells expressing a ribozyme targeting HCMV smallest capsid protein (SCP) mRNA.
試料
試料: Smallest capsid protein (SCP) deficient human cytomegalovirus (HCMV) particles
ウイルス: Human herpesvirus 5 (ヘルペスウイルス)
キーワード
herpesvirus / betaherpesvirus / human cytomegalovirus / smallest capsid protein / ribozyme
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_5697.map.gz / 形式: CCP4 / 大きさ: 412 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Reconstruction of human cytomegalovirus (HCMV) SCP-deficient particles. The viral particles were harvested from cells expressing a ribozyme targeting HCMV smallest capsid protein (SCP) mRNA.
ボクセルのサイズ
X=Y=Z: 3.789 Å
密度
表面レベル
登録者による: 12.5 / ムービー #1: 12.5
最小 - 最大
-14.40537834 - 20.163827900000001
平均 (標準偏差)
0.9467631 (±4.10478497)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-127
-127
-303
サイズ
480
480
480
Spacing
480
480
480
セル
A=B=C: 1818.72 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
3.789
3.789
3.789
M x/y/z
480
480
480
origin x/y/z
0.000
0.000
0.000
length x/y/z
1818.720
1818.720
1818.720
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
-132
-122
-147
NX/NY/NZ
250
274
261
MAP C/R/S
1
2
3
start NC/NR/NS
-127
-127
-303
NC/NR/NS
480
480
480
D min/max/mean
-14.405
20.164
0.947
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添付データ
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試料の構成要素
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全体 : Smallest capsid protein (SCP) deficient human cytomegalovirus (HC...
全体
名称: Smallest capsid protein (SCP) deficient human cytomegalovirus (HCMV) particles
要素
試料: Smallest capsid protein (SCP) deficient human cytomegalovirus (HCMV) particles
ウイルス: Human herpesvirus 5 (ヘルペスウイルス)
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超分子 #1000: Smallest capsid protein (SCP) deficient human cytomegalovirus (HC...
超分子
名称: Smallest capsid protein (SCP) deficient human cytomegalovirus (HCMV) particles タイプ: sample / ID: 1000 / Number unique components: 1
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超分子 #1: Human herpesvirus 5
超分子
名称: Human herpesvirus 5 / タイプ: virus / ID: 1 / Name.synonym: human cytomegalovirus 詳細: Cultured with cells expressing ribozyme targeting the smallest capsid protein (SCP) mRNA of the virus. So the viral particles are SCP-deficient. NCBI-ID: 10359 / 生物種: Human herpesvirus 5 / データベース: NCBI / ウイルスタイプ: VIRION / ウイルス・単離状態: SPECIES / ウイルス・エンベロープ: Yes / ウイルス・中空状態: Yes / Syn species name: human cytomegalovirus