Polynucleotide adenylyltransferase

In enzymology, a polynucleotide adenylyltransferase  is an enzyme that catalyzes the chemical reaction
 * ATP + RNA-3'OH  pyrophosphate + RNApA-3'OH

Thus, the two substrates of this enzyme are ATP and RNA, whereas its two products are pyrophosphate and RNA with an extra adenosine nucleotide at its 3' end.