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methionine Definition

me·thio·nine (mə t̸hī′ə nēn′, -nin)

noun

an essential amino acid, CHSCHCHCH(NH)COOH, that contains sulfur, obtained from various proteins and used as a food supplement and in medicine

Etymology: me(thyl) + thion(ic) + -ine

methionine Usage Examples

Converse of object

  • call: Homocysteine is a highly toxic compound made in the body from a protein building block called methionine.

Preposition: at

  • codon: They were noted also to be homozygous for methionine at codon 129.

Adjective modifier

  • oral: If vomiting is not a problem, oral methionine may be a suitable alternative for remote areas, outside hospital.
  • essential: Homocysteine, a normal breakdown product of the essential amino acid methionine, is believed to exert several toxic effects.

Modifies a noun

  • homozygote: One methionine homozygote French case of variant CJD has been identified.
  • synthase: In 1994 details of the binding site of methionine synthase from Escherichia coli were revealed.
  • biosynthesis: The specific features of methionine biosynthesis and metabolism in plants.
  • content: The extent to which consumption of these foods affects the risk of heart disease as a result of their methionine content remains unknown.

Noun used with modifier

  • amino: SAMe is a natural compound obtained from the amino acid methionine, which is found in every cell in your body.
  • acid: SAMe is a natural compound obtained from the amino acid methionine, which is found in every cell in your body.
  • s-adenosyl: S-adenosyl methionine ( SAMe ) is a substance synthesized in the body that has recently been made available as a supplement.

Preposition: in

  • presence: Homocysteine is converted into the amino acid methionine in the presence of B12.