Unique Characteristics of the Pyrrolysine System in the 7th Order of Methanogens: Implications for the Evolution of a Genetic Code Expansion Cassette

Figure 1

Gene organization of the Pyl system. On the left, the gene organization of the pylBCD and  pylS (pylSc and pylSn in bacteria) is shown for Methanosarcinaceae and some representative bacteria (adapted and updated from [11, 13, 53]). On the right is shown the organization of these genes in the 7th order of methanogens.