| [A] Halobacterium salinarium | HALSA00823 | Q9HQP2 | Transmembrane oligosaccharyl transferase |
| [A] Halobacterium salinarum (strain ATCC 29341 / DSM 671 / R1) | HALS300857 | B0R4T2 | Oligosaccharyl transferase |
| [A] Halomicrobium mukohataei (strain ATCC 700874 / DSM 12286 / JCM 9738 / NCIMB 13541) | HALMD02701 | C7P065 | Oligosaccharyl transferase STT3 subunit |
| [A] Haloquadratum walsbyi (strain DSM 16790) | HALWD01747 | Q18GV3 | transmembrane oligosaccharyl transferase |
| [A] Halorubrum lacusprofundi (strain ATCC 49239 / DSM 5036 / JCM 8891 / ACAM 34) | HALLT01047 | B9LMS1 | Oligosaccharyl transferase STT3 subunit |
| [A] Methanocorpusculum labreanum (strain ATCC 43576 / DSM 4855 / Z) | METLZ00656 | A2SR78 | Hypothetical protein |
| [A] Methanoculleus marisnigri (strain ATCC 35101 / DSM 1498 / JR1) | METMJ00174 | A3CRV9 | Oligosaccharyl transferase, STT3 subunit precursor |
| [A] Methanosphaerula palustris (strain ATCC BAA-1556 / DSM 19958 / E1-9c) | METPE00751 | B8GG73 | Oligosaccharyl transferase STT3 subunit |
| [A] Methanospirillum hungatei (strain JF-1 / DSM 864) | METHJ02717 | Q2FTM5 | Oligosaccharyl transferase, STT3 subunit |
| [A] Methanosaeta thermophila (strain DSM 6194 / PT) | METTP01457 | A0B996 | Oligosaccharyl transferase, STT3 subunit PFAM: Oligosaccharyl transferase, STT3 subunit KEGG: mma:MM0647 oligosaccharyl transferase |
| [A] Methanococcoides burtonii (strain DSM 6242) | METBU01436 | Q12VP3 | Transmembrane oligosaccharyl transferase |
| [A] Methanosarcina acetivorans | METAC03579 | Q8TJM6 | Transmembrane oligosaccharyl transferase |
| [A] Uncultured methanogenic archaeon RC-I | UNCMA02688 | Q0W818 | transmembrane oligosaccharyltransferase |