Based on the Random House Dictionary, © Random House, Inc. 2012.
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| formed in the conversion of methionine to cysteine |
| any amino acid that is required by an animal for growth cannot be synthesized by the animal's cells |
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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hydroxyproline hy·drox·y·pro·line (hī-drŏk'sē-prō'lēn')
n.
An amino acid produced during the hydrolysis of collagen.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hydroxyproline
an amino acid formed upon hydrolysis of connective-tissue proteins such as collagen (about 14 percent by weight) and elastin but rarely from other proteins. The molecular structure of hydroxyproline contains a secondary amino group (NH) rather than the primary amino group (-NH2) characteristic of most amino acids. First isolated (1902) from gelatin, a breakdown product of collagen, hydroxyproline is one of several so-called nonessential amino acids; i.e., animals can synthesize it from glutamic acid and do not require dietary sources. Excretion of abnormal quantities of hydroxyproline is a symptom of the connective-tissue disease called Marfan's syndrome.
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