Methionine | |
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Methionine |
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Other names
2-amino-4-(methylthio)butanoic acid |
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Identifiers | |
Abbreviations | Met, M |
CAS number | 59-51-8 , 63-68-3 (L-isomer) , 348-67-4 (D-isomer) |
PubChem | 876 |
ChemSpider | 853 , 5907 (L-isomer) |
UNII | 73JWT2K6T3 |
EC-number | 200-432-1 |
KEGG | D04983 |
ChEBI | CHEBI:16811 |
ChEMBL | CHEMBL42336 |
ATC code | V03 ,QA05BA90, QG04BA90 |
Jmol-3D images | Image 1 Image 2 |
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Properties[2] | |
Molecular formula | C5H11NO2S |
Molar mass | 149.21 g mol−1 |
Appearance | White crystalline powder |
Density | 1.340 g/cm3 |
Melting point |
281 °C decomp. |
Solubility in water | Soluble |
Acidity (pKa) | 2.28 (carboxyl), 9.21 (amino)[1] |
Supplementary data page | |
Structure and properties |
n, εr, etc. |
Thermodynamic data |
Phase behaviour Solid, liquid, gas |
Spectral data | UV, IR, NMR, MS |
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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Infobox references |
Methionine ( /mɛˈθaɪ.ɵniːn/ or /mɛˈθaɪ.ɵnɪn/; abbreviated as Met or M)[3] is an α-amino acid with the chemical formula HO2CCH(NH2)CH2CH2SCH3. This essential amino acid is classified as nonpolar. This amino-acid is coded by the codon AUG, also known as the initiation codon, since it indicates mRNA's coding region where translation into protein begins.
Contents |
Together with cysteine, methionine is one of two sulfur-containing proteinogenic amino acids. Its derivative S-adenosyl methionine (SAM) serves as a methyl donor. Methionine is an intermediate in the biosynthesis of cysteine, carnitine, taurine, lecithin, phosphatidylcholine, and other phospholipids. Improper conversion of methionine can lead to atherosclerosis.[4]
This amino acid is also used by plants for synthesis of ethylene. The process is known as the Yang Cycle or the methionine cycle.
Methionine is one of only two amino acids encoded by a single codon (AUG) in the standard genetic code (tryptophan, encoded by UGG, is the other). The codon AUG is also the "Start" message for a ribosome that signals the initiation of protein translation from mRNA. As a consequence, methionine is incorporated into the N-terminal position of all proteins in eukaryotes and archaea during translation, although it is usually removed by post-translational modification. In bacteria, the derivative N-formylmethionine is used as the initial amino acid.
Rats fed a diet without methionine developed steatohepatitis. Administration of methionine ameliorated the pathological consequences of methionine deprivation.[5]
As an essential amino acid, methionine is not synthesized de novo in humans, hence we must ingest methionine or methionine-containing proteins. In plants and microorganisms, methionine is synthesized via a pathway that uses both aspartic acid and cysteine. First, aspartic acid is converted via β-aspartyl-semialdehyde into homoserine, introducing the pair of contiguous methylene groups. Homoserine converts to O-succinyl homoserine, which then reacts with cysteine to produce cystathionine, which is cleaved to yield homocysteine. Subsequent methylation of the thiol group by folates affords methionine. Both cystathionine-γ-synthase and cystathionine-β-lyase require pyridoxyl-5'-phosphate as a cofactor, whereas homocysteine methyltransferase requires vitamin B12 as a cofactor.[6]
Enzymes involved in methionine biosynthesis:
Although mammals cannot synthesize methionine, they can still use it in a variety of biochemical pathways:
Methionine is converted to S-adenosylmethionine (SAM) by (1) methionine adenosyltransferase.
SAM serves as a methyl-donor in many (2) methyltransferase reactions, and is converted to S-adenosylhomocysteine (SAH).
(3) Adenosylhomocysteinase converts SAH to homocysteine.
There are two fates of homocysteine: it can be used to regenerate methionine, or to form cysteine.
Methionine can be regenerated from homocysteine via (4) methionine synthase in a reaction that requires Vitamin B12 as a cofactor.
Homocysteine can also be remethylated using glycine betaine (NNN-trimethyl glycine, TMG) to methionine via the enzyme betaine-homocysteine methyltransferase (E.C.2.1.1.5, BHMT). BHMT makes up to 1.5% of all the soluble protein of the liver, and recent evidence suggests that it may have a greater influence on methionine and homocysteine homeostasis than methionine synthase.
Homocysteine can be converted to cysteine.
Racemic methionine can be synthesized from diethyl sodium phthalimidomalonate by alkylation with chloroethylmethylsulfide (ClCH2CH2SCH3) followed by hydrolysis and decarboxylation.[7]
Food | g/100g |
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Egg, white, dried, powder, glucose reduced | 3.204 |
Sesame seeds flour (low fat) | 1.656 |
Egg, whole, dried | 1.477 |
Cheese, parmesan, shredded | 1.114 |
Brazil nuts | 1.008 |
Soy protein concentrate | 0.814 |
Chicken, broilers or fryers, roasted | 0.801 |
Fish, tuna, light, canned in water, drained solids | 0.755 |
Beef, cured, dried | 0.749 |
Bacon | 0.593 |
Beef, ground, 95% lean meat / 5% fat, raw | 0.565 |
Pork, ground, 96% lean / 4% fat, raw | 0.564 |
Wheat germ | 0.456 |
Oat | 0.312 |
Peanuts | 0.309 |
Chickpea | 0.253 |
Corn, yellow | 0.197 |
Almonds | 0.151 |
Beans, pinto, cooked | 0.117 |
Lentils, cooked | 0.077 |
Rice, brown, medium-grain, cooked | 0.052 |
High levels of methionine can be found in eggs, sesame seeds, Brazil nuts, fish, meats and some other plant seeds; methionine is also found in cereal grains. Most fruits and vegetables contain very little of it. Most legumes are also low in methionine. The complement of cereal (methionine) and legumes (lysine), providing a complete protein,[9] is a classic combination, found throughout the world, such as in rice and beans or tortilla and beans.
Racemic methionine is sometimes added as an ingredient to pet foods.[10]
There is some evidence that restricting methionine consumption can increase lifespans in some animals.[11]
A 2005 study showed methionine restriction without energy restriction extends mouse lifespan.[12]
On the other hand, a study published in Nature showed adding just the essential amino acid methionine to the diet of fruit flies under dietary restriction (DR - including restriction of essential amino acids) restored fecundity without reducing the lifespans that are typical of DR. Restored to normal levels, "Methionine alone increased fecundity as much as full feeding, but without reducing lifespan."[13][14]
Several studies showed that methionine restriction also increses lifespan and inhibits aging-related disease processes[15][16] and inhibits colon carcinogenesis in rats[17].
A 2009 study on rats showed "methionine supplementation in the diet specifically increases mitochondrial ROS production and mitochondrial DNA oxidative damage in rat liver mitochondria offering a plausible mechanism for its hepatotoxicity"[18].
DL-methionine is sometimes given as a supplement to dogs; it helps keep dogs from damaging grass by reducing the pH of the urine.[19]
Methionine is allowed as a supplement to organic poultry feed under the US certified organic program.[20]
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