The capsid of most polyhedral viruses is in the shape of a regular polyhedron with 20 triangular faces and 12 corners. The capsomeres of each face form an equilateral triangle. An example of a polyhedral virus in the shape of an icosahedron is the adenovirus. Another icosahedral virus is the poliovirus. Polyhedral viruses
The capsid of most polyhedral viruses is in the shape of a regular polyhedron with 20 triangular faces and 12 corners. The capsomeres of each face form an equilateral triangle. An example of a polyhedral virus in the shape of an icosahedron is the adenovirus. Another icosahedral virus is the poliovirus. Polyhedral viruses
(h=0,k=0) k (h=5,k=0 h Figure 16.13 The Structure of an Icosahedral Capsid.Pentons are located at the 12 vertices.Hexons form the edges and faces of the icosahedron.This capsid contains 42 capsomers:all protomers are identical
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③复合对称的病毒粒子 T4 Bacteriophage
③复合对称的病毒粒子 T4 Bacteriophage
以大肠杆菌T4噬菌体为例 头部：廿面体对称结构，由蛋白 质衣壳构成，内含一条DNA。 颈部：薄盘状，附颈须。 尾鞘：长95nm, 衣壳粒螺旋对 称；可伸缩。 尾髓:中空，DNA可由此进入细 胞。 基板: 六角形盘状物，其上有刺 突、尾丝。 刺突: 有吸附功能。 尾丝: 有识别吸附功能。 大肠杆菌T4噬菌体构造 蝌蚪形噬菌体的构造
以大肠杆菌T4噬菌体为例 头部：廿面体对称结构，由蛋白 质衣壳构成，内含一条DNA。 颈部：薄盘状，附颈须。 尾鞘：长95nm, 衣壳粒螺旋对 称；可伸缩。 尾髓:中空，DNA可由此进入细 胞。 基板: 六角形盘状物，其上有刺 突、尾丝。 刺突: 有吸附功能。 尾丝: 有识别吸附功能。 大肠杆菌T4噬菌体构造 蝌蚪形噬菌体的构造