6-pyruvoyl tetrahydrobiopterin synthase (PTPS) requires phosphorylation on Ser-19 for enzyme activity (Scherer-Oppliger et al. 1999).
Scherer-Oppliger, T, Blau, N, Thöny, B, Leimbacher, W
cGMP-dependent protein kinase activity of PRKG2 [cytosol]
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