Abstract
Eukaryotic nuclear and mitochondrial RNA polymerases (RNAPs) can cap RNAs by initiating with the non-canonical initiating nucleotide (NCIN) nicotinamide adenine dinucleotide (both NAD+ and NADH). Similarly, recently Dengue viral RNAs (vRNA) have been observed with NCIN caps, but how these vRNAs are capped is unknown. Here we show directly that Dengue virus's (DENV) RNAP NS5 can utilize both NAD+ and NADH, as well as flavin adenine dinucleotide and dephospho-coenzyme A, as initiating nucleotides during RNA transcription in place of DENV's well-conserved initiating adenine.
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