Table 1. General characteristics of the plasmids analysed in this study.
| Plasmid | Organism | Origin | Length, bp | Coding, % | CDS | G+C% | Accession |
| pTN2 | Thermococcus nautilus | East Pacific Rise 13°N (−2330 m) | 13015 | 91,1 | 12 | 48,4 | NC_014115 |
| pP12-1 | Pyrococcus sp. 12/1 | East Pacific Rise 13°N (−2330 m) | 12205 | 90,8 | 17 | 44,7 | NC_014110 |
| pCIR10 | Thermococcus sp. | Central Indian Ridge TJ (−2420 m) | 13322 | 90,3 | 16 | 45,5 | this study |
| pIRI48 | Thermococcus sp. | Mid-Atlantic Ridge 36°N (−2274 m) | 12974 | 90,3 | 13 | 50,0 | this study |
| pMETVU01 | Methanocaldococcus vulcanius M7 | East Pacific Rise 13°N (−2600 m) | 10704 | 72.2 | 13 | 46,3 | NC_013408 |
| pAMT7 | Thermococcus sp. | East Pacific Rise 13°N (−2330 m) | 8576 | 80,9 | 11 | 45,6 | this study |
| pEXT9a | Thermococcus sp. | East Pacific Rise 9°N (−2508 m) | 10556 | 80,6 | 16 | 45,8 | this study |
| pIRI33 | Thermococcus sp. | Mid-Atlantic Ridge 36°N (−2274 m) | 11041 | 80,9 | 16 | 44,9 | this study |