RNA. 2005 Aug;11(8):1271-80. Epub 2005 Jun 29.

An end-healing enzyme from Clostridium thermocellum with 5' kinase, 2',3' phosphatase, and adenylyltransferase activities.

Martins A, Shuman S.

CthPnkp's adenylyltransferase activity is highest at mildly acidi pH.