Abstract
Tetrahydrobiopterin (BH4) and related pteridines have received much attention since BH4 was found to be an essential cofactor for nitric oxide synthases (NOS) (1–3). As shown in Fig. 1, BH4 is produced from guanosine 5′-triphosphate (GTP) by three enzymes. GTP cyclohydrolase I converts GTP to dihydroneopterin triphosphate, which is then converted to 6-pyruvoyltetrahydropterin by 6-pyruvoyltetrahydropterin synthase. This second unstable intermediate compound is converted to BH4 through a two-step reduction of its side-chain carbonyl groups by sepiapterin reductase.
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Hatakeyama, K. (1998). Measurement of Biopterin and the Use of Inhibitors of Biopterin Biosynthesis. In: Titheradge, M.A. (eds) Nitric Oxide Protocols. Methods in Molecular Biology™, vol 100. Humana Press. https://doi.org/10.1385/1-59259-749-1:251
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