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Histidine ball and stick model spinning. 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 ...
Carnosine is naturally produced by the body in the liver [2] from beta-alanine and histidine. Like carnitine, carnosine is composed of the root word carn, meaning "flesh", alluding to its prevalence in meat. [3] There are no plant-based sources of carnosine. [4] Carnosine is readily available as a synthetic nutritional supplement.
d-Fructose-l-histidine (FruHis) is a ketosamine combining the d-isomer of fructose and the l-isomer of histidine into a functional group. FruHis is present in dried fruits . In interaction with lycopene , FruHis is a potential food related antioxidant and chemopreventive agent, found abundantly in dried tomatoes .
They are phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, and histidine. [2] [4] There has been debate as to whether there are 8 or 9 essential amino acids. [5] The consensus seems to lean towards 9 since histidine is not synthesized in adults. [6]
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]
Ergothioneine is a thiourea derivative of the betaine of histidine and contains a sulfur atom bonded to the 2-position of the imidazole ring. [19] Typical of thioureas, ergothioneine is less reactive than typical thiols such as glutathione towards alkylating agents like maleimides.
Aromatic L-amino acid decarboxylase is active as a homodimer.Before addition of the pyridoxal phosphate cofactor, the apoenzyme exists in an open conformation. Upon cofactor binding, a large structural transformation occurs as the subunits pull closer and close the active site.
The US FDA reports 50,000 health problems a year due to dietary supplements [41] and these often involve bodybuilding supplements. [42] For example, the "natural" best-seller Craze, 2012's "New Supplement of the Year" by bodybuilding.com, widely sold in stores such as Walmart and Amazon , was found to contain N,alpha-Diethylphenylethylamine , a ...
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