EC 2.7.7.53     
Accepted name: ATP adenylyltransferase
Reaction: ADP + ATP = phosphate + P1,P4-bis(5′-adenosyl) tetraphosphate
Other name(s): bis(5′-nucleosyl)-tetraphosphate phosphorylase (NDP-forming); diadenosinetetraphosphate αβ-phosphorylase; adenine triphosphate adenylyltransferase; diadenosine 5′,5′′′-P1,P4-tetraphosphate αβ-phosphorylase (ADP-forming); dinucleoside oligophosphate αβ-phosphorylase
Systematic name: ADP:ATP adenylyltransferase
Comments: GTP and adenosine tetraphosphate can also act as adenylyl acceptors.
References:
1.  Guranowski, A. and Blanquet, S. Phosphorolytic cleavage of diadenosine 5′,5′′′-P1,P4-tetraphosphate. Properties of homogeneous diadenosine 5′,5′′′- P1,P4-tetraphosphate αβ-phosphorylase from Saccharomyces cerevisiae. J. Biol. Chem. 260 (1985) 3542–3547. [PMID: 2982863]
[EC 2.7.7.53 created 1986]