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Methionine (symbol Met or M) [3] (/ m ɪ ˈ θ aɪ ə n iː n /) [4] is an essential amino acid in humans.. As the precursor of other non-essential amino acids such as cysteine and taurine, versatile compounds such as SAM-e, and the important antioxidant glutathione, methionine plays a critical role in the metabolism and health of many species, including humans.
Homocysteine levels typically are higher in men than women, and increase with age. [15] [16] Common levels in Western populations are 10 to 12 μmol/L, and levels of 20 μmol/L are found in populations with low B-vitamin intakes or in the elderly (e.g., Rotterdam, Framingham). [17] [18]
Homocysteine (left) and methionine (right) are related by demethylation and remethylation. Remethylation is a major step in the conversion of homocysteine to the essential amino acid methionine . The remethylation process involves the enzyme methionine synthase (MS), which requires vitamin B 12 as a cofactor, and also depends indirectly on ...
In enzymology, a methionine gamma-lyase (EC 4.4.1.11) is an enzyme that catalyzes the chemical reaction. L-methionine + H 2 O methanethiol + NH 3 + 2-oxobutanoate. Thus, the two substrates of this enzyme are L-methionine and H 2 O, whereas its 3 products are methanethiol, NH 3, and 2-oxobutanoate.
In enzymology, a formylmethionine deformylase (EC 3.5.1.31) is an enzyme that catalyzes the chemical reaction. N-formyl-L-methionine + H 2 O formate + L-methionine. Thus, the two substrates of this enzyme are N-formyl-L-methionine and H 2 O, whereas its two products are formate and L-methionine.
To provide extra benefits for hair, skin and nails, this supplement contains a proprietary blend of ingredients, including MSM to lower inflammation in the body and strengthen keratin, l ...
This page was last edited on 15 November 2007, at 21:44 (UTC).; Text is available under the
In enzymology, a homocysteine S-methyltransferase (EC 2.1.1.10) is an enzyme that catalyzes the chemical reaction. S-methylmethionine + L-homocysteine 2 L-methionine. Thus, the two substrates of this enzyme are S-methylmethionine and L-homocysteine, and it produces 2 molecules of L-methionine.
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