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• W1969883332 startingPage "64" @default.
• W1969883332 abstract "Previous genetic and biochemical experiments have shown that the vaccinia virus J3 protein has three different roles in mRNA synthesis and modification. First, J3 is a (nucleoside-2'-O-)methyltransferase which methylates the 2' position of the first transcribed nucleotide, thus converting a cap-0 to a cap-1 structure at the 5' ends of mRNAs. Second, J3 is a processivity factor for the virus coded poly(A) polymerase. Third, J3 has recently been shown to have intermediate and late gene positive transcription elongation factor activity in vivo. Previous experiments have shown that the poly(A) polymerase stimulatory activity and the (nucleoside-2'-O-)methyltransferase activity are two independent functions of the protein that can be genetically separated through site-directed mutagenesis. In this article, the relationship between the J3-mediated transcription elongation activity and the two other functions of the protein was investigated by constructing several site-directed mutant viruses that contain specific defects in either methyltransferase or poly(A) polymerase processivity functions. The results demonstrate that the J3 positive transcription elongation factor activity is a third independent function of the protein that is genetically separable from its two other functions in mRNA modification. The results also show that neither the poly(A) polymerase stimulatory nor the methyltransferase activities of the J3 protein is essential for virus growth in cell culture." @default.
• W1969883332 created "2016-06-24" @default.
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• W1969883332 date "2002-09-01" @default.
• W1969883332 modified "2023-09-26" @default.
• W1969883332 title "The Positive Transcription Elongation Factor Activity of the Vaccinia Virus J3 Protein Is Independent from Its (Nucleoside-2′-O-) Methyltransferase and Poly(A) Polymerase Stimulatory Functions" @default.
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• W1969883332 doi "https://doi.org/10.1006/viro.2002.1538" @default.
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