Lexic.us

Definition of Selenocysteine

1. Noun. (biochemistry) A naturally-occurring amino acid, present in several enzymes, whose structure is that of cysteine but with the sulfur atom replaced by one of selenium ¹

¹ Source: wiktionary.com

Medical Definition of Selenocysteine

1. An unusual amino acid of proteins, the selenium analogue of cysteine, in which a selenium atom replaces sulphur. Involved in the catalytic mechanism of seleno enzymes such as formate dehydrogenase of E. Coli and mammalian glutathione peroxidase. May be co translationally coded by a special opal suppressor tRNAase that recognises certain UGA nonsense codons. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

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