1.Structure of virion
peplomer (spike)
成熟的、有感染性的、 完整的病毒颗粒
Enveloped virus
envelope
viral core
capsid
capsomere
nucleic acid
nucleocapsid
(Naked virus)
Viral core---viral nucleic acid
衣壳 刺突
包膜
包膜病毒
2. Chemical composition of viruses
Nucleic acid
Protein
⑴ structural protein
(capsid,matrix and envelope)
⑵ non-structural protein
lipid and carbohydrate
⑵satellites (卫星病毒) →→plant disease
• can encode self-capsid protein
• satellites RNA molecules (曾经称为拟病毒)
(ssRNA; capsid protein from helper virus)
⑶prion(朊粒) ---新型感染因子
(DNA病毒大多数为双链,RNA 病毒多数为单链)
⑵Viral genome (DNA or RNA)
---determine infectivity, replication, heredity and variation of vcapsid(衣壳)
⑴Consists of repeating polypeptide
导病毒进入宿主细胞)