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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.
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. The systematic name of this enzyme class is L-phenylalanine:pyruvate aminotransferase.
In plants, the shikimate pathway first leads to the formation of chorismate, which is the precursor of phenylalanine, tyrosine, and tryptophan. These aromatic amino acids are the precursors of many secondary metabolites , all essential to a plant's biological functions, such as the hormones salicylate and auxin .
Protein deficiency has been shown to affect all of the body's organs and many of its systems, for example affecting brain development in infants and young children; inhibiting upkeep of the immune system, increasing risk of infection; affecting gut mucosal function and permeability, thereby reducing absorption and increasing vulnerability to ...
The following other wikis use this file: Usage on ar.wikipedia.org فينيل بروبانويد; Usage on arz.wikipedia.org فينيل ألانين
Analogously to phenylalanine hydroxylase and tyrosine hydroxylase, this enzyme uses (6R)-L-erythro-5,6,7,8-tetrahydrobiopterin (BH 4) and dioxygen as cofactors. [ 2 ] In humans, the stimulation of serotonin production by administration of tryptophan has an antidepressant effect [ 3 ] [ 4 ] and inhibition of tryptophan hydroxylase (e.g. by p ...
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The phenylpropanoids are a diverse family of organic compounds that are biosynthesized by plants from the amino acids phenylalanine and tyrosine in the shikimic acid pathway. [1] Their name is derived from the six-carbon, aromatic phenyl group and the three-carbon propene tail of coumaric acid , which is the central intermediate in ...
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