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Phenylalanine (symbol Phe or F) [3] is an essential α-amino acid with the formula C 9 H 11 NO 2.It can be viewed as a benzyl group substituted for the methyl group of alanine, or a phenyl group in place of a terminal hydrogen of alanine.
Tyrosine is semi-essential; therefore, it can be synthesized by the animal, but only from phenylalanine. Phenylketonuria, a genetic disorder that occurs as a result of the inability to breakdown phenylalanine, is due to a lack of the enzyme phenylalanine hydroxylase. A dietary lack of tryptophan can cause stunted skeletal development. [9]
Nonpolar Neutral −0.4 75.067 7.03 GGN Histidine: His H Cationic Brønsted acid and base Positive, 10% Neutral, 90% −3.2 211 5.9 155.156 2.26 CAY Isoleucine: Ile I Aliphatic Nonpolar Neutral 4.5 131.175 5.49 AUH Leucine: Leu L Aliphatic Nonpolar Neutral 3.8 131.175 9.68 YUR, CUY [55] Lysine: Lys K Cation Brønsted acid Positive −3.9 146. ...
A person with B blood type will have the B and H antigen present. A person with AB blood type will have A, B, and H antigens present. And finally, a person with O blood type will only have the H antigen present. This means all blood types have the H antigen, which explains why the O blood type is known as the "universal donor". [citation needed]
Ace-K is often combined with other artificial sweeteners, like aspartame, and has gained popularity for being a low-calorie alternative to sugar. Although Ace-K is approved by the FDA, there is ...
[23] [24] The aromatic amino acid phenylalanine, synthesized in the shikimic acid pathway, is the common precursor of phenol containing amino acids and phenolic compounds. In plants, the phenolic units are esterified or methylated and are submitted to conjugation , which means that the natural phenols are mostly found in the glycoside form ...
Phenylalanine: F Phe Essential for humans, phenylalanine, tyrosine, and tryptophan contain a large, rigid aromatic group on the side chain. These are the biggest amino acids. Like isoleucine, leucine, and valine, these are hydrophobic and tend to orient towards the interior of the folded protein molecule. Phenylalanine can be converted into ...
Lysine. Technically, any organic compound with an amine (–NH 2) and a carboxylic acid (–COOH) functional group is an amino acid. The proteinogenic amino acids are a small subset of this group that possess a central carbon atom (α- or 2-) bearing an amino group, a carboxyl group, a side chain and an α-hydrogen levo conformation, with the exception of glycine, which is achiral, and proline ...