Table 1. Genomic features of marine Thaumarchaeota with complete genomesa.
| Organisma | N. adriaticus NF5 | N. piranensis D3C | N. maritimus SCM1 | N. koreensis AR1 | N. sediminis AR2 | C. symbiosum A | N. brevis CN25 |
|---|---|---|---|---|---|---|---|
| Habitat | Surface water | Surface water | Aquarium gravel | Arctic sediment | Arctic sediment | Sponge symbiont | Open ocean |
| Genome size (Mb) | 1.80 | 1.71 | 1.65 | 1.64 | 1.69 | 2.05 | 1.23 |
| G+C content (%) | 33.4 | 33.8 | 34.2 | 34.2 | 33.6 | 57.4 | 33.2 |
| CDS | 2184 | 2161 | 1796 | 1890 | 1974 | 2014 | 1445 |
| 16S–23S rRNA genes | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Number of tRNAsb | 43 (45) | 43 (44) | 44 | 38 | 37 | 45 | 42 |
| Nitrite reductase genes (nirK) | 2 | 1 | 2 | 1 | 1 | 0 | 1 |
| Urease | − | + | − | − | + | + | − |
| Flagellac | + | − | − | − | − | − | − |
| Photolyasec | + | + | − | − | − | − | + |
Abbreviation: CDS, coding DNA sequences.
a
'Ca. Nitrosopumilus maritimus' SCM1 (CP000866), 'Ca. Nitrosopumilus koreensis' AR1 (CP003842), 'Ca. Nitrosopumilus sediminis' AR2 (CP003843), 'Ca. Cenarchaeum symbiosum' A (DP000238), 'Ca. Nitrosopelagicus brevis' CN25 (CP007026).
b
Number in brackets includes putative tRNAs. It should be noted that the number of tRNAs might be underrepresented as archaeal tRNAs sometimes possess non-canonical introns.
c
Present in the incomplete genomes of 'Ca. Nitrosoarchaeum limnia' strains SFB1 and BG20.