Biochemistry

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proline

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

proline , organic compound, one of the 20 amino acids commonly found in animal proteins. Only the l -stereoisomer appears in mammalian protein. It is not essential to the human diet, since it can be synthesized in the body from glutamic acid . The amino group through which it can link to other amino acids (see peptide , protein ) is part of a circlelike array of atoms—unique to proline. This is significant because when the amino acid is incorporated into protein, its peculiar structure leads to sharp bends, or kinks, in the peptide chain, thus figuring prominently in the determination of the protein's shape. Proline and its derivate hydroxyproline, make up some 21% of the amino-acid residues found in collagen , the fibrous protein of connective tissue. Its chemical synthesis was accomplished in 1900; in 1901 proline was isolated from casein, the milk protein, and its structure was shown to be the same as that of the synthetic compound.

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"proline." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

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proline

A Dictionary of Plant Sciences | 1998 | | Copyright

proline A heterocyclic, non-polar (see NON-POLAR MOLECULE) imino acid, which is present in all proteins studied to date.

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MICHAEL ALLABY. "proline." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "proline." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O7-proline.html

MICHAEL ALLABY. "proline." A Dictionary of Plant Sciences. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-proline.html

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proline

A Dictionary of Zoology | 1999 | | Copyright

proline A heterocyclic, non-polar imino acid that is present in all proteins studied to date.

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MICHAEL ALLABY. "proline." A Dictionary of Zoology. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "proline." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-proline.html

MICHAEL ALLABY. "proline." A Dictionary of Zoology. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-proline.html

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proline

A Dictionary of Nursing | 2008 | Copyright

proline (proh-leen) n. an amino acid found in many proteins.

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"proline." A Dictionary of Nursing. 2008. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"proline." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O62-proline.html

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proline

A Dictionary of Food and Nutrition | 2005 | | Copyright

proline A non‐essential amino acid.

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DAVID A. BENDER. "proline." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

DAVID A. BENDER. "proline." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O39-proline.html

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proline

A Dictionary of Biology | 2004 | Copyright

proline See amino acid.

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"proline." A Dictionary of Biology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"proline." A Dictionary of Biology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O6-proline.html

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