ATG or AUG
The codon for Methionine; the translation initiation codon. Usually, protein translation can only start at a Methionine codon (although this codon may be found elsewhere within the protein sequence as well). In eukaryotic DNA, the sequence is ATG; in RNA it is AUG. Usually, the first AUG in the mRNA is the point at which translation starts, and an open reading frame follows - i.e. the nucleotides taken three at a time will code for the Amino acids of the protein, and a stop codon will be found only when the protein coding region is complete.
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This online tool shows commonly used genetic codon frequency table in expression host organisms including Escherichia coli and other common host organisms.
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If you know of any terms that have been omitted from this glossary that you feel would be useful to include, please send detail to the Editorial Office at GenScript: [email protected]