How To Correctly Write A Protein Name . The primary structure (or sequence) of a peptide or protein is always written starting with the amino terminus on the left and progressing towards the carboxy terminus. For example, moraxella bovis can be written m. Protein Structure Biology Dictionary from biologydictionary.net Synthesis begins at amino end and ends at carboxyl end. The primary structure (or sequence) of a peptide or protein is always written starting with the amino terminus on the left and progressing towards the carboxy terminus. An international committee published recommendations for genetic symbols and nomenclature in 1957.