Fig. 6: Relationship between the presence of the three nucleoside metabolic pathways and phylogenetic positions of halophilic archaea.

The phylogenetic tree was constructed using 16S rRNA gene sequences. A sequence from Thermoplasma volcanium (tvo) was used as an outgroup. The colors of the circles correspond to those of the nucleoside metabolic pathways in Fig. 5. Organisms shown in red and pink codes indicate the halophilic archaea shown in Fig. 3. The organisms in red codes show those whose proteins were actually examined in this study.