PAP is generated as a byproduct of sulfonation reactions in vivo; its hydrolysis to AMP and orthophosphate returns its constituents to the pool of molecules available for cytosolic nucleotide metabolism. Bisphosphate 3'-nucleotidase 1catalyzes this reaction efficiently in vitro; whether other nucleotidases also play a role in PAP breakdown in vivo is unknown.
Xiong, JP, Smith, JJ, York, JD, Gu, RF, Spiegelberg, BD
3'(2'),5'-bisphosphate nucleotidase activity of BPNT1 [cytosol]
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