Tags: Enzyme.
In enzymology an ATP adenylyltransferase (EC 2.7.7.53) is an enzyme that catalyzes the chemical reactionADP + ATP phosphate + P1P4-bis(5′-adenosyl) tetraphosphateThus the two substrates of this enzyme are ADP and ATP whereas its two products are phosphate and P1P4-bis(5′-adenosyl) tetraphosphate.This enzyme belongs to the family of transferases specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases).