This essential amino acid is classified as neutral, and nonpolar because of the inert and hydrophobic nature of the benzyl side chain.
Phenylalanine can cause intellectual disabilities, brain damage, seizures and other problems in people with PKU . Phenylalanine occurs naturally in many protein-rich foods, such as milk, eggs and meat. Phenylalanine is also sold as a dietary supplement.
Phenylalanine occurs naturally in many protein-rich foods, such as milk, eggs and meat. Phenylalanine is also sold as a dietary supplement. The artificial sweetener aspartame (Equal, NutraSweet), which is added to many medications, diet foods and diet sodas, contains phenylalanine.
The ingredients of aspartame are aspartic acid and phenylalanine. Both are naturally occurring amino acids. Aspartic acid is produced by your body, and phenylalanine is an essential amino acid that you get from food.
The high plasma phenylalanine concentrations increase phenylalanine entry into brain and restrict the entry of other large neutral amino acids. In the literature, emphasis has been on high brain phenylalanine as the pathological substrate that causes mental retardation.
Phenylalanine is found in most protein-containing foods such as milk, eggs, cheese, nuts, soybeans, chicken, beef, pork, beans and fish.
Since phenylalanine can be neurotoxic and can affect the synthesis of inhibitory monoamine neurotransmitters, the phenylalanine in aspartame could conceiveably mediate neurologic effects. Aspartame also potentiates the induction of seizures by inhaled fluorothyl or by electroconvulsive shock.
Phenylalanine is an amino acid, which are the building blocks of proteins in your body. Your body is unable to produce enough L-phenylalanine on its own, so it's considered an essential amino acid that must be obtained through your diet (4).
Essential amino acids cannot be made by the body. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Essential amino acids cannot be made by the body. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
The specific structure of valine is indicative of its chemical formula, C5H11NO2. This structure attaches to the central carbon of the amino acid back bone as the R group.
In L-Phenylalanine, the order of priority is . So the configuration is S.
The researchers found that the single-dose of phenylalanine reduced food intake, increased levels of GLP-1 and decreased levels of ghrelin. Repeated administration also caused weight loss in the obese mice. The researchers also observed that the rats were moving around more, which might encourage them to lose weight.
Phenylalanine is thought to mediate or exacerbate hepatic encephalopathy, and an impaired liver may not be able to cope with the ammoniagenic properties of the amino acid constituents, or adequately metabolize methanol.
Doses higher than 5,000 milligrams a day can cause nerve damage. Risks. People with certain conditions should avoid using this supplement, including those with schizophrenia (tardive dyskinesia, a movement disorder, may develop.)
Quite apart from all of the possible effects already mentioned, consuming too much of products containing phenylalanine (notably sugar-free gum and sweets) can produce a laxative effect
Phenylalanine is used for depression, attention deficit-hyperactivity disorder (ADHD), Parkinson's disease, chronic pain, osteoarthritis, rheumatoid arthritis, alcohol withdrawal symptoms, and a skin disease called vitiligo. Some people apply it directly to the skin for vitiligo.
Phenylalanine hydroxylase (PAH) (EC 1.14. 16.1) is an enzyme that catalyzes the hydroxylation of the aromatic side-chain of phenylalanine to generate tyrosine.
Phenylalanine F (Phe)
As the name suggests, phenylalanine, an essential amino acid, is a derivative of alanine with a phenyl substituent on the β carbon. Phenylalanine is quite hydrophobic and even the free amino acid is not very soluble in water.Phenylalanine and tyrosine constitute the two initial steps in the biosynthesis of dopamine, which, in its turn, is the metabolic precursor of noradrenaline and adrenaline. The extracellular phenylalanine concentration influences brain function in phenylalanine deficiency (PHD) by decreased dopamine synthesis.
Amino acid poperties
| Amino-acid name | 3-letter code | Properties |
|---|
| Leucine | Leu | Non-polar, aliphatic residues |
| Lysine | Lys | Positively charged (basic amino acids; non-acidic amino acids); Polar; Hydrophilic; pK=10.5 |
| Methionine | Met | Polar, non-charged |
| Phenylalanine | Phe | Aromatic /td> |
D-Phenylalanine is the synthetic dextro isomer of phenylalanine, an essential amino acid with anti-depressant and analgesic activities. It is an enantiomer of a L-phenylalanine. It is a tautomer of a D-phenylalanine zwitterion.
