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D-Phenylalanine is distributed to the various tissues of the body via the systemic circulation. It appears to cross the blood–brain barrier less efficiently than L -phenylalanine, and so a small amount of an ingested dose of D -phenylalanine is excreted in the urine without penetrating the central nervous system.
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In enzymology, a phenylalanine adenylyltransferase (EC 2.7.7.54) is an enzyme that catalyzes the chemical reaction. ATP + L-phenylalanine diphosphate + N-adenylyl-L-phenylalanine. Thus, the two substrates of this enzyme are ATP and L-phenylalanine, whereas its two products are diphosphate and N-adenylyl-L-phenylalanine.
L-phenylalanine + pyruvate phenylpyruvate + L-alanine Thus, the two substrates of this enzyme are L-phenylalanine and pyruvate , whereas its two products are phenylpyruvate and L-alanine . This enzyme belongs to the family of transferases , specifically the transaminases , which transfer nitrogenous groups.
l-DOPA is produced from the amino acid l-tyrosine by the enzyme tyrosine hydroxylase. l-DOPA can act as an l-tyrosine mimetic and be incorporated into proteins by mammalian cells in place of l-tyrosine, generating protease-resistant and aggregate-prone proteins in vitro and may contribute to neurotoxicity with chronic l-DOPA administration. [10]
The enzyme phenylalanine racemase (EC 5.1.1.11, phenylalanine racemase, phenylalanine racemase (adenosine triphosphate-hydrolysing), gramicidin S synthetase I) is the enzyme that acts on amino acids and derivatives. It activates both the L & D stereo isomers of phenylalanine to form L-phenylalanyl adenylate and D-phenylalanyl adenylate, which ...
^a CID 6140 from PubChem (L-phenylalanine) This page was last edited on 12 January 2024, at 23:28 (UTC). Text is available under the Creative Commons ...
D-Phenylalanine (DPA, D-Phe), sold under the brand names Deprenon, Sabiben, and Sabiden, is an enantiomer of phenylalanine which is described as an antidepressant and is marketed as a prescription drug for medical use in Argentina. [1] [2] The medication has been marketed since at least the 1970s [3] and continued to be available by the 2000s. [1]