(3)Virion enzyme:exist in virocapsomer,categorized as follow by function. One kind is mediate penetration and release of virus,such as T4 phage lysozyme,flu virus neuramidinase. Another is involved in virus macromolecule synthesis,such as retrovirus,hepadnavirus,the dsRNA virus,antisense RNA virus .As for some complicate viruses,for instance the poxvirus duplicated in cytoplasm have many enzymes involved in DNA duplication and RNA transcript fabrication
(3) Virion enzyme: exist in virocapsomer, categorized as follow by function. One kind is mediate penetration and release of virus, such as T4 phage lysozyme, flu virus neuramidinase. Another is involved in virus macromolecule synthesis, such as retrovirus, hepadnavirus, the dsRNA virus, antisense RNA virus .As for some complicate viruses , for instance the poxvirus duplicated in cytoplasm have many enzymes involved in DNA duplication and RNA transcript fabrication
2.Non-structure protein (NS protein):it means proteins encoded by virus genome have function but do not bind the virus particles in duplicate process. The quantities and quality of them are dependent on the virus species,complex of virus genome and the periods of virus duplication.Mostly Ns proteins have enzyme activities and involved in regulating virus replication and transcription.Recently data show that part of viruses have the ability to antiapoptosis and inhibition antigen presentation.For example,the 3ABC protein in foot and mouth disease virus is used to classify the wild virus and attentuated vaccine immune
2. Non-structure protein (NS protein): it means proteins encoded by virus genome have function but do not bind the virus particles in duplicate process. The quantities and quality of them are dependent on the virus species, complex of virus genome and the periods of virus duplication. Mostly NS proteins have enzyme activities and involved in regulating virus replication and transcription. Recently data show that part of viruses have the ability to antiapoptosis and inhibition antigen presentation. For example, the 3ABC protein in foot and mouth disease virus is used to classify the wild virus and attentuated vaccine immune
3.Virus lipoid:virus lipoid is formed from the host cell during the release of virus,mainly resides in virus peplos.The lipoid accounts for 20-35% in the structural composition,the poxvirus lipoid is 5%and the rabies virus is up to 50%. 4.Viral carbohydrate Some of viruses contain a few carbohydrate.It is present in virus carbohydrate and glucolipide by oligosacharide lateral chain or mucopolysaccharides.Except for the enveloped viruses glucoprotein ecphyma,some of complex virus particles have internal glucoprotein or glycosylated capsid protein.Glucoprotein is significant immunigen,for instance,anti influenza virus hemagglutinin serum have conspicuous virus neutralization. 5.Other composition There are some positive ionic compounds(such as tetramethylenediamine,apermidine,spermine)in some animal viruses plant viruses and phage viruses.It is reported that there is metal positive ion in several plant viruses.These minimal organic positive ion or inorganic positive ion bind randomly with virus nucleic acid and affect the conformation of nucleic acid.The combining weight of them is relevant to the correlated ion concentration in environment and acquire the unconstant ingredient from environment when virus assembly
3. Virus lipoid: virus lipoid is formed from the host cell during the release of virus, mainly resides in virus peplos. The lipoid accounts for 20-35% in the structural composition, the poxvirus lipoid is 5% and the rabies virusis up to 50%. 4.Viral carbohydrate Some of viruses contain a few carbohydrate. It is present in virus carbohydrate and glucolipide by oligosacharide lateral chain or mucopolysaccharides. Except for the enveloped viruses ’ glucoprotein ecphyma, some of complex virus particles have internal glucoprotein or glycosylated capsid protein. Glucoprotein is significant immunigen, for instance, anti - influenza virus hemagglutinin serum have conspicuous virus neutralization. 5.Other composition There are some positive ionic compounds(such as tetramethylenediamine, apermidine, spermine) in some animal viruses , plant viruses and phage viruses. It is reported that there is metal positive ion in several plant viruses. These minimal organic positive ion or inorganic positive ion bind randomly with virus nucleic acid and affect the conformation of nucleic acid. The combining weight of them is relevant to the correlated ion concentration in environment and acquire the unconstant ingredient from environment when virus assembly
Section 3 Reproduction and taxnomy of viruses
Section 3 Reproduction and taxnomy of viruses