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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Structure of RNAs replicated by the DNA-dependent T7 RNA polymerase.

The DNA-dependent RNA polymerase of bacteriophage T7 efficiently and specifically replicates two structurally related RNAs, termed X and Y RNAs. Replication of both RNAs involves synthesis of complementary strands initiated with pppC and pppG. RNAs transcribed from DNA template containing the established sequences of X and Y RNAs were efficiently replicated by T7 RNA polymerase. Both RNAs possess palindromic sequences with a dual axis of symmetry, permitting formation of hairpin-, dumbbell-, or cloverleaf-type structures. The template must consist of RNA and not DNA sequence, and the terminal unpaired dinucleotides of the RNA are necessary for replication. Nucleotidyl transferase activity of E. coli adenylates the unpaired CCOH dinucleotide at the 3' end of a C strand of X RNA. This feature, as well as the length (64 nucleotides) and compact structure of X and Y RNAs, suggests that they may resemble tRNA molecules and tRNA-like structures at the 3' termini of many plant viral RNA genomes.[1]

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