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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.
Methionine, an essential sulfur containing amino acid. The recommended daily allowance (RDA) of methionine (combined with cysteine) for adults is set at 13–14 mg kg-1 day-1 (13–14 mg per kg of body weight per day), but some researchers have argued that this figure is too low, and should more appropriately be 25 mg kg-1 day-1. [1]
Methionine sulfoximine (MSO, also known as MetSox [1]) is an irreversible glutamine synthetase inhibitor. It is the sulfoximine derivative of methionine with convulsant effects. [2] Methionine sulfoximine is composed of two different diastereomers, which are L-S-Methionine sulfoximine and L-R-Methionine sulfoximine.
Patients with propionic acidemia should be started as early as possible on a low protein diet. In addition to a protein mixture that is devoid of methionine, threonine, valine, and isoleucine, the patient should also receive L -carnitine treatment and should be given antibiotics 10 days per month in order to remove the intestinal propiogenic flora.
The sulfonium functional group present in S-adenosyl methionine is the center of its peculiar reactivity. Depending on the enzyme, S-adenosyl methionine can be converted into one of three products: adenosyl radical, which converts to deoxyadenosine (AdO): classic rSAM reaction, also cogenerates methionine
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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.
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