More com plicated viruses have their nucleic acid surrounded by a protein coat which is further engulfed in a membrane structure, an envelope consisting of virally coded glycoproteins derived from one of several regions within the infected cell during the maturation of the virus particle. The genetic material of these com plex viruses encodes for many dozens of virus specific proteins
More complicated viruses have their nucleic acid surrounded by a protein coat which is further engulfed in a membrane structure, an envelope consisting of virally coded glycoproteins derived from one of several regions within the infected cell during the maturation of the virus particle. The genetic material of these complex viruses encodes for many dozens of virus specific proteins
the complete fully assembled virus is termed the virion. It may have a glycoprotein envelope which has peplomers(包膜粒) projections, spike突起,刺突) which form a ' fringettg'around the particle. The protein coat surrounding the nucleic acid is referred to as the capsid. The capsid is composed of morphological units or capsomers(衣壳粒). The type of capsomer depends on the overall shape of the capsid but in the case of icosahedral capsids the capsomers are either pentamers or hexamers(五邻体或六邻体).The combined nucleic acid-protein complex which comprises the genome is termed the nucleocapsid (t 衣壳), which- is often enclosed in a core withinthe virion
The complete fully assembled virus is termed the virion. It may have a glycoprotein envelope which has peplomers (包膜粒)(projections, spike突起,刺突) which form a ‘fringe边缘’ around the particle. The protein coat surrounding the nucleic acid is referred to as the capsid . The capsid is composed of morphological units or capsomers（衣壳粒）. The type of capsomer depends on the overall shape of the capsid, but in the case of icosahedral capsids the capsomers are either pentamers or hexamers（五邻体或六邻体）. The combined nucleic acid-protein complex which comprises the genome is termed the nucleocapsid（核 衣壳）, which is often enclosed in a core within the virion
Structure of the virus Nucleic acid (DNA or RNA) nucleocapsid Viron Capsid (protein) Envelope (glycoprotein)
Nucleic acid （DNA or RNA） nucleocapsid Viron Capsid （protein） Envelope （glycoprotein） Structure of the virus
(a) b Fig(a unenveloped/helical (tobacco mosaic virus):(b)unenveloped/icosahedral (adenovirus);(c)enveloped/helical (paramyxovirus):(d)enveloped/icosahedral (herpesvirus)
Fig. (a) unenveloped/helical (tobacco mosaic virus): (b) unenveloped/icosahedral (adenovirus); (c) enveloped/helical (paramyxovirus): (d) enveloped/ icosahedral (herpesvirus)
Surface tubules Outer envelope Core envelope Core fibriles Lateral body Palisade layer )