transaminase

transaminase

[trans-am-uh-neys, -neyz, tranz-]
noun Biochemistry.
any of a class of enzymes, occurring in most plant and animal tissue, that cause transamination.

Origin:
1940–45; transamin(ation) + -ase

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World English Dictionary
transaminase (trænzˈæmɪˌneɪz, -ˌneɪs)
 
n
biochem an enzyme that catalyses the transfer of an amino group from one molecule, esp an amino acid, to another, esp a keto acid, in the process of transamination

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American Heritage
Medical Dictionary

transaminase trans·am·i·nase (trāns-ām'ə-nās', -nāz', trānz-)
n.
See aminotransferase.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

transaminase

any of a group of enzymes that catalyze the transfer of the amino group (NH2) of an amino acid to a carbonyl compound, commonly an a-keto acid (an acid with the general formula RCOCOOH). The liver, for example, contains specific transaminases for the transfer of an amino group from glutamic acid to a-keto acids that correspond to most of the other amino acids. Other transaminases catalyze reactions in which an amino group is transferred from glutamic acid to other compounds-e.g., to aldehydes to form amines. Transamination is one of the principal mechanisms for the formation of necessary amino acids in the metabolism of proteins. Vitamin B6 is commonly involved in the action of the transaminases.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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