nonsense ka kei kura: share it if it worth sharing NONSENSE CODON: any one of the nucleotide triplets UAA (ochre), UAG (amber), and UGA (opal) that signal termination of translation and release of the polypeptide chain from the site of synthesis. A codon that is nonsense in one strain of an organism may nevertheless code for an amino acid in another strain containing an appropriate suppressor gene . UGA sometimes codes for selenocysteine and, in mitochondria, for Trp. In mitochondria AGA is a nonsense codon rather than UGA. NONSENSE SUPRESSOR: any tRNA molecule that is able to insert an amino-acid residue into a growing polypeptide chain at a nonsense codon in an mRNA molecule. It has an altered anticodon, produced as a result of a suppressor mutation. NONSENSE MUTATION: A mutation that changes a codon that codes for one amino acid into a codon that does not specify any amino acid (a nonsense codon).
Posted on: Tue, 11 Jun 2013 01:54:06 +0000
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