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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 ...
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 ...
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.
At the same time, the imidazole side-chain of the histidine residue interacting at the other pole of the iron is pulled toward the porphyrin ring. This interaction forces the plane of the ring sideways toward the outside of the tetramer, and also induces a strain in the protein helix containing the histidine as it moves nearer to the iron atom.
The sample and subsequent buffers are manually poured into the column and collected at the bottom end after flowing through the resin bed (in light blue at the base of the column). 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 ...
A study demonstrated that the free N-terminal of histidine on anserine and carnosine protect against zinc-caused neurotoxicity and regulate the Arc pathway in which Arc protein is used to produce dendrite protein for connecting nerve cells. [8] Both Anserine and Carnosine are chelating agents for copper and other transition metals. [9]
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The absolute values and relative rankings of hydrophobicity determined by chromatographic methods can be affected by a number of parameters. These parameters include the silica surface area and pore diameter, the choice and pH of aqueous buffer, temperature and the bonding density of stationary phase chains. [3]