ジャーナル: Nat Commun / 年: 2014 タイトル: Protruding knob-like proteins violate local symmetries in an icosahedral marine virus. 著者: Preeti Gipson / Matthew L Baker / Desislava Raytcheva / Cameron Haase-Pettingell / Jacqueline Piret / Jonathan A King / Wah Chiu / 要旨: Marine viruses play crucial roles in shaping the dynamics of oceanic microbial communities and in the carbon cycle on Earth. Here we report a 4.7-Å structure of a cyanobacterial virus, Syn5, by ...Marine viruses play crucial roles in shaping the dynamics of oceanic microbial communities and in the carbon cycle on Earth. Here we report a 4.7-Å structure of a cyanobacterial virus, Syn5, by electron cryo-microscopy and modelling. A Cα backbone trace of the major capsid protein (gp39) reveals a classic phage protein fold. In addition, two knob-like proteins protruding from the capsid surface are also observed. Using bioinformatics and structure analysis tools, these proteins are identified to correspond to gp55 and gp58 (each with two copies per asymmetric unit). The non 1:1 stoichiometric distribution of gp55/58 to gp39 breaks all expected local symmetries and leads to non-quasi-equivalence of the capsid subunits, suggesting a role in capsid stabilization. Such a structural arrangement has not yet been observed in any known virus structures.
履歴
登録
2013年5月9日
登録サイト: PDBE / 処理サイト: PDBE
改定 1.0
2014年5月21日
Provider: repository / タイプ: Initial release
改定 1.1
2014年5月28日
Group: Other
改定 1.2
2014年7月16日
Group: Database references
改定 1.3
2017年8月30日
Group: Data collection / カテゴリ: em_imaging Item: _em_imaging.nominal_defocus_max / _em_imaging.nominal_defocus_min
A: MAJOR CAPSID PROTEIN B: MAJOR CAPSID PROTEIN C: MAJOR CAPSID PROTEIN D: MAJOR CAPSID PROTEIN E: MAJOR CAPSID PROTEIN F: MAJOR CAPSID PROTEIN G: MAJOR CAPSID PROTEIN
A: MAJOR CAPSID PROTEIN B: MAJOR CAPSID PROTEIN C: MAJOR CAPSID PROTEIN D: MAJOR CAPSID PROTEIN E: MAJOR CAPSID PROTEIN F: MAJOR CAPSID PROTEIN G: MAJOR CAPSID PROTEIN
A: MAJOR CAPSID PROTEIN B: MAJOR CAPSID PROTEIN C: MAJOR CAPSID PROTEIN D: MAJOR CAPSID PROTEIN E: MAJOR CAPSID PROTEIN F: MAJOR CAPSID PROTEIN G: MAJOR CAPSID PROTEIN
x 5
icosahedral pentamer
1.23 MDa, 35 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
1,228,709
35
ポリマ-
1,228,709
35
非ポリマー
0
0
水
0
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
point symmetry operation
4
4
A: MAJOR CAPSID PROTEIN B: MAJOR CAPSID PROTEIN C: MAJOR CAPSID PROTEIN D: MAJOR CAPSID PROTEIN E: MAJOR CAPSID PROTEIN F: MAJOR CAPSID PROTEIN G: MAJOR CAPSID PROTEIN