Biochemistry

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threonine

The Columbia Encyclopedia, 6th ed. | 2008 | Copyright

threonine , organic compound, one of the 22 α- amino acids commonly found in animal proteins. Only the l -stereoisomer appears in mammalian protein. It is one of several essential amino acids needed in the diet; human beings cannot synthesize it from simpler metabolites. Young adults need about 14 mg of this amino acid per day per kilogram (6 mg per lb) of body weight. Although threonine participates in many reactions in bacteria, including the biosynthesis of vitamin B ₁₂ and isoleucine , its metabolic role in higher animals, including man, remains obscure. It is known only as a constituent of proteins, and even in that form it is relatively unreactive. In spite of the fact that its side chain has a hydroxyl group similar to that of serine , there is no indication that it participates in the catalytic functions of any enzyme. Threonine was isolated from the protein fibrin in 1935 and synthesized in the same year.

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threonine

A Dictionary of Food and Nutrition | 2005 | | Copyright

threonine An essential amino acid. It was the last of the protein amino acids to be discovered, in 1935, in studies of nitrogen balance on subjects fed mixtures of the then known amino acids in place of proteins.

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DAVID A. BENDER. "threonine." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>.

DAVID A. BENDER. "threonine." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O39-threonine.html

DAVID A. BENDER. "threonine." A Dictionary of Food and Nutrition. 2005. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O39-threonine.html

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threonine

A Dictionary of Nursing | 2008 | Copyright

threonine (three-ŏ-neen) n. an essential amino acid. See also amino acid.

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threonine

A Dictionary of Plant Sciences | 1998 | | Copyright

threonine An aliphatic, polar (see POLAR MOLECULE) alpha-amino acid.

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MICHAEL ALLABY. "threonine." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "threonine." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O7-threonine.html

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threonine

A Dictionary of Zoology | 1999 | | Copyright

threonine An aliphatic, polar, alpha amino acid.

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MICHAEL ALLABY. "threonine." A Dictionary of Zoology. 1999. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "threonine." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O8-threonine.html

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threonine

A Dictionary of Biology | 2004 | Copyright

threonine See amino acid.

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