Enzyme |
Product
OR
Function |
Virus |
Enzymes affecting interaction of
host cell surface with virions
Neuraminidase.
Endoglycosidase.
Fusion factor. |
NANA split off from surface polysaccharides. Degradation of surface. Modification of lipid bilayer. |
Ortho - and paramyxovirus.
E. coli phages. Paramyxovirus. |
DNA- mRNA transcription enzymes
DNA-dependent RNA polymerase.
dsRNA transcriptase
.
ssRNA transcriptase. |
Transcribes ss mRNA.
Transcribes ss mRNA.
Transcribes (+) strand ss mRNA. |
Poxvirus, Phages N4, SPO2.
dsRNA viruses.
ssRNA (+) viruses. |
Enzymes adding specific terminal groups to viral mRNA
Nucleotide Phosphohydrolase.
Guanylyl transferase. RNA methylases.
Poly (A) polymerase. |
Converts 5'-ppp to 5'-PP. Adds guanylyl residue to 5'-pp in mRNA.
Methylates 5' end guanyl residues in mRNA.
Synthesizes 3' end poly (A) tail in mRNA. |
Viruses synthesizing mRNA in virions
(e. g. poxviruses and reoviruses). |
RNA- DNA transcription enzymes
Reverse transcriptase. RNase H (with above).
Polynucleotide ligase. |
DNA-RNA hybrids; dsDNA.
Degrades RNA in RNA-DNA hybrids.
Closes ss breaks in dsRNA. |
Retroviruses.
-do-
-do- |
Nucleic
acid
replication
or
processing
enzymes
DNA-dependent DNA polymerase.
DNases (exo- and endo-). Endoribonucleases. |
Synthesizes dsDNA.
Break DNA strands and crosslinks.
mRNA processing. |
Hepatitis B.
Pox-, retro- adenoviruses.
Ss mRNA viruses (e. g: poxviruses). |
Other enzymes
Protein kinases
tRNA aminoaovlases. |
Phosphorylate proteins.
Aminoacylate tDNA. |
Retro-, orthomyxo- paramyxo,
herpes- and adenoviruses
Retroviruses |
