Abstract
Conversion of phenylalanine to tyrosine by the cytosolic liver enzyme phenylalanine hydroxylase (PAH) requires phenylalanine, molecular O2 and the obligatory cofactor tetrahydrobiopterin (BH4)1.The phenylalanine hydroxylation produces stoichiometrically an oxidized BH4 intermediate, the pterin-4α-carbinolamine (4α-CA). This unstable intermediate is proposed to be dehydrated to the quinonoid dihydrobiopterin (q-BH2) by the phenylalanine hydroxylase stimulating factor (PHS; also termed pterin-4α-carbinolamine dehydratase)2. The presence of the dihydropteridine reductase (DHPR) together with NADH completes the reductive recycling of the BH4 cofactor. A deficiency in PAH, PHS or DHPR leads to different forms of hyperphenylalaninemia3.
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Thöny, B., Neuheiser, F., Hauer, C.R., Heizmann, C.W. (1993). Molecular Cloning and Recombinant Expression of the Human Liver Phenylalanine Hydroxylase Stimulating Factor Revealed Structural and Functional Identity to the Dimerization Cofactor for the Nuclear Transcription Factor HNF-1α. In: Ayling, J.E., Nair, M.G., Baugh, C.M. (eds) Chemistry and Biology of Pteridines and Folates. Advances in Experimental Medicine and Biology, vol 338. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2960-6_20
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DOI: https://doi.org/10.1007/978-1-4615-2960-6_20
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