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Separate molecules of West Nile virus methyltransferase can independently catalyze the N7 and 2′-O methylations of viral RNA cap
- Source :
-
Virology . Jul2008, Vol. 377 Issue 1, p1-6. 6p. - Publication Year :
- 2008
-
Abstract
- Abstract: West Nile virus methyltransferase catalyzes N7 and 2′-O methylations of the viral RNA cap (GpppA-RNA→m7GpppAm-RNA). The two methylation events are independent, as evidenced by efficient N7 methylation of GpppA-RNA→m7GpppA-RNA and GpppAm-RNA→m7GpppAm-RNA, and by the 2′-O methylation of GpppA-RNA→GpppAm-RNA and m7GpppA-RNA→m7GpppAm-RNA. However, the 2′-O methylation activity prefers substrate m7GpppA-RNA to GpppA-RNA, thereby determining the dominant methylation pathway as GpppA-RNA→m7GpppA-RNA→m7GpppAm-RNA. Mutant enzymes with different methylation defects can trans complement one another in vitro. Furthermore, sequential treatment of GpppA-RNA with distinct methyltransferase mutants generates fully methylated m7GpppAm-RNA, demonstrating that separate molecules of the enzyme can independently catalyze the two cap methylations in vitro. [Copyright &y& Elsevier]
- Subjects :
- *RNA
*METHYLATION
*ENZYMOLOGY
*VIRAL replication
Subjects
Details
- Language :
- English
- ISSN :
- 00426822
- Volume :
- 377
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Virology
- Publication Type :
- Academic Journal
- Accession number :
- 32648249
- Full Text :
- https://doi.org/10.1016/j.virol.2008.04.026