tetrahydrobiopterin

Tetrahydrobiopterin (BH4) is a cofactor for aromatic amino acid hydroxylases and an essential cofactor for nitric oxide synthase (NOS), which is used in the study of endothelial dysfunction such as hypertension, hypercholesterolemia, and diabetes.

2,4-Diamino-6-hydroxypyrimidine (DAHP) (DAHP) is a selective, specific inhibitor of GTP cyclohydrolase I, the rate limiting step for de novo pterin synthesis

SPR inhibitor 3 is a class of small-molecule compounds used to inhibit the activity of sepiapterin reductase; it blocks the biosynthetic pathway of tetrahydrobiopterin (BH4), thereby affecting the production of nitric oxide synthase and monoamine neurotransmitters.

7,8-Dihydro-L-biopterin is an oxidation product of tetrahydrobiopterin.

L-Sepiapterin is an activator of phenylalanine hydroxylase and also a synthetic precursor of tetrahydrobiopterin, a cofactor of endothelial nitric oxide synthase. L-Sepiapterin can improve endothelial dysfunction in mesenteric arterioles of db/db mice and induce angiogenesis; meanwhile, L-Sepiapterin can also inhibit the proliferation and migration of ovarian cancer cells by downregulating p70S6K-dependent VEGFR-2 expression. Based on the above biological activities, L-Sepiapterin can be applied to mechanistic studies related to hyperphenylalaninemia.