methionine
noun
me·thi·o·nine
| \ mə-ˈthī-ə-ˌnēn
\
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Definition of methionine
: a crystalline sulfur-containing essential amino acid C5H11NO2S that occurs in the levorotatory form as a constituent of many proteins
Examples of methionine in a Sentence
Recent Examples on the Web
For example, grains are low in lysine, while beans and nuts are low in methionine, the FDA says. — Carolyn L. Todd, SELF, "Does It Make a Difference if You Get Your Protein from Plants or Animals?," 28 Aug. 2019 For instance, grains are low in an amino acid called lysine, while beans and nuts are low in methionine. — Carolyn L. Todd, SELF, "Here's What Actually Happens in Your Body When You Eat Protein," 20 June 2019 More specifically, methylenetetrahydrofolate reductase converts the amino acid homocysteine to another, methionine. — Tara C. Smith, SELF, "Why You Don't Actually Need to Test for MTHFR Gene Variants," 18 Mar. 2019 Plants use sulfur to manufacture cysteine and methionine, two amino acids important for producing protein. — Patrick Di Justo, WIRED, "What's Inside Sta-Green Planting Mix? Masterful Decomposition.," 28 July 2010These example sentences are selected automatically from various online news sources to reflect current usage of the word 'methionine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for methionine
methionine
noun
me·thi·o·nine
| \ mə-ˈthī-ə-ˌnēn
\
\
Medical Definition of methionine
: a crystalline sulfur-containing essential amino acid C5H11NO2S that occurs in the L-form as a constituent of many proteins (as casein and egg albumin), that is important especially as a source of sulfur for the biosynthesis of cysteine and as a source of methyl groups for transmethylation reactions (as in the biosynthesis of choline, creatine, and adrenaline), and that is used as a dietary supplement for human beings and their domestic mammals and poultry and in the treatment of fatty infiltration of the liver
—abbreviation Met