PCNA, an atypical member of the sulfotransferase family, displays notably low affinity for 3'-phospho-5'-adenylyl sulfate (PAPS) and minimal catalytic activity towards substrates like L-triiodothyronine, thyroxine, estrone, p-nitrophenol, 2-naphthylamine, and 2-beta-naphthol. Its precise function remains elusive, but PCNA is suggested to participate in drug and neurotransmitter metabolism within the central nervous system (CNS) . PCNA Protein, Human (sf9, His) is the recombinant human-derived PCNA protein, expressed by Sf9 insect cells , with N-His labeled tag.
