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Histidine (symbol His or H) [2] is an essential amino acid that is used in the biosynthesis of proteins.It contains an α-amino group (which is in the protonated –NH 3 + form under biological conditions), a carboxylic acid group (which is in the deprotonated –COO − form under biological conditions), and an imidazole side chain (which is partially protonated), classifying it as a ...
In chemistry, a zwitterion (/ ˈ t s v ɪ t ə ˌ r aɪ ə n / TSVIT-ə-ry-ən; from German Zwitter 'hermaphrodite'), also called an inner salt or dipolar ion, [1] is a molecule that contains an equal number of positively and negatively charged functional groups. [2] 1,2-dipolar compounds, such as ylides, are sometimes excluded from the ...
Chemical formula: C 6 H 9 N 3 O 2 ... (L-histidine) This page was last edited on 12 April 2023, at 11:40 (UTC). Text is available under the Creative Commons ...
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.
Formula Mon. mass§ Avg. mass Alanine: A Ala C 3 H 5 NO 71.03711 71.0779 Cysteine: C Cys C 3 H 5 NOS 103.00919 103.1429 Aspartic acid: D Asp C 4 H 5 NO 3: 115.02694 115.0874 Glutamic acid: E Glu C 5 H 7 NO 3: 129.04259 129.1140 Phenylalanine: F Phe C 9 H 9 NO 147.06841 147.1739 Glycine: G Gly C 2 H 3 NO 57.02146 57.0513 Histidine: H His C 6 H 7 ...
Carnosine (beta-alanyl-L-histidine) is a dipeptide molecule, made up of the amino acids beta-alanine and histidine. It is highly concentrated in muscle and brain tissues. [citation needed] Carnosine was discovered by Russian chemist Vladimir Gulevich. [1] Carnosine is naturally produced by the body in the liver [2] from beta-alanine and histidine.
Sulfanilic acid (4-aminobenzenesulfonic acid) is an organic compound with the formula H 3 NC 6 H 4 SO 3. It is an off-white solid. It is a zwitterion, which explains its high melting point. It is a common building block in organic chemistry. [4]
[71] [72] For example, the heparin-binding protein Azurocidin is a member of the PA clan, but with a glycine in place of the nucleophile and a serine in place of the histidine. [73] Similarly, RHBDF1 is a homolog of the S54 family rhomboid proteases with an alanine in the place of the nucleophilic serine.