methionine


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methionine

 [mĕ-thi´o-nēn]
a sulfur-containing amino acid, one of the essential amino acids, furnishing both methyl groups and sulfur necessary for metabolism.

me·thi·o·nine (Met, M),

(me-thī'ō-nēn),
The l-isomer is a nutritionally essential amino acid and the most important natural source of "active methyl" groups in the body, hence usually involved in methylations in vivo; the dl-form is used as an adjunct in the treatment of liver diseases.

methionine

/me·thi·o·nine/ (Met) (M) (mĕ-thi´ŏ-nēn) a naturally occurring, essential amino acid that furnishes both methyl groups and sulfur necessary for normal metabolism. Labeled with carbon 11, it is used in positron emission tomography for detection of neoplasms.

methionine

(mə-thī′ə-nēn′)
n.
A sulfur-containing essential amino acid, C5H11NO2S, obtained from various proteins or prepared synthetically and used as a dietary supplement and in pharmaceuticals.

methionine (Met)

[methī′ənēn]
an essential amino acid needed for proper growth in infants and for maintenance of nitrogen balance in adults. It is a source for methyl groups and sulfur in the body. It is also administered as adjunctive treatment in liver diseases. See also amino acid, protein.
enlarge picture
Chemical structure of methionine

me·thi·o·nine

(me-thī'ō-nēn)
A nutritionally essential amino acid and the most important natural source of "active methyl" groups in the body, hence usually involved in methylations in vivo.

methionine

An antidote used to treat paracetamol poisoning from overdose. A drug used in combination with paracetamol to protect the liver against the serious damage that is caused by deliberate overdosage. A brand name of the combination is Paradote.
Methionineclick for a larger image
Fig. 221 Methionine . Molecular structure.

methionine (M, Met)

one of 20 AMINO ACIDS common in proteins. It has an ‘R’ group with a nonpolar structure and is relatively insoluble in water. See Fig. 221 . The ISOELECTRIC POINT of methionine is 5.7.

me·thi·o·nine

(M) (me-thī'ō-nēn)
The l-isomer is a nutritionally essential amino acid and the most important natural source of "active methyl" groups in the body.

methionine

(məthī´ənēn´),
n one of the essential amino acids. See also amino acid.

methionine

Met; a sulfur-containing amino acid occurring in proteins, which is an essential component of the diet of animals.

methionine deficiency
exacerbates deficiencies of choline and vitamin B12.
methionine enkephalin
met-enkephalin; see enkephalin.
methionine sulfoximine
the convulsant agent produced in flour by the agene process. Causes hysteria in dogs, ferrets, rabbits and cats, but other species are not affected.
References in periodicals archive ?
Folate deficiency disturbs hepatic methionine metabolism and promotes liver injury in the ethanol-fed micropig.
Current screening for homocystinuria is based on the identification of increased plasma methionine and will not detect nonclassical homocystinuria.
The results of the dynamic sensitivity analysis revealed that the metabolites in the methionine cycle behave stably as a result of perturbation to the enzymatic activity but have a possibility to oscillate in the absence of the allosteric regulation of CBS by AdoMet.
In the present study, the dietary methionine requirements for the rainbow trout based on the plasma free methionine concentrations (PPmet and PAmet) could be between 0.
Feedinfo News Service]: We are hearing a lot more about the production of methionine through fermentation.
The inactivation of methionine synthase in isolated rat hepatocytes by sodium nitroprusside.
Methionine is transformed into S-adenosyl-L-methionine (SAMe) and then into sulphur-containing metabolites (cysteine, taurine and glutathione) via the trans- sulphuration pathway.
The valine version was transmitted 100 times in the families of depressed children, while the methionine version as transmitted only 59 times.
Key words: garri, fermentation, lactic acid, methionine
The polynucleotide includes a polynucleotide which has a nucleotide sequence encoding an amino acid sequence from methionine at position 1 to asparagine at position 243 of SEQ ID NO: 2 in the sequence listing, or which has a nucleotide sequence encoding the amino acid sequence having one or several amino acid deletions, substitutions and/or additions and is capable of controlling salt stress tolerance.
Researchers are also focusing on increasing methionine, cystine and lysine for improved animal nutrition.
Hyperhomocysteinemia occurs as a consequence of either (1) the inability of homocysteine to remethylate to methionine or (2) the trans-sulfuration of methionine to cysteine.