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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 ...
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 ...
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 ...
Aromatic amino acids often serve as the precursors to important biochemicals. Histidine is the precursor to histamine.; Tryptophan is the precursor to 5-hydroxytryptophan and then serotonin, tryptamine, auxin, kynurenines, and melatonin.
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.
A polyhistidine-tag, best known by the trademarked name His-tag, is an amino acid motif in proteins that typically consists of at least six histidine (His) residues, often at the N- or C-terminus of the protein. It is also known as a hexa histidine-tag, 6xHis-tag, or His6 tag.
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