| [A] Methanobrevibacter smithii (strain PS / ATCC 35061 / DSM 861) | METS300708 | A5UL43 | Oligosaccharyl transferase, STT3 subunit |
| [A] Methanosphaera stadtmanae (strain DSM 3091) | METST00347 | Q2NHD2 | conserved hypothetical membrane-spanning protein related to oligosaccharyl transferase; membrane protein |
| [A] Methanobacterium thermoautotrophicum | METTH01585 | O27660 | Oligosaccharyl transferase STT3 subunit related protein |
| [A] Methanocaldococcus fervens (strain DSM 4213 / JCM 157852 / AG86) | METFA00569 | C7P779 | Oligosaccharyl transferase STT3 subunit |
| [A] Methanocaldococcus jannaschii | METJA01568 | Y1525_METJA | Uncharacterized membrane protein MJ1525 |
| [A] Methanocaldococcus vulcanius (strain ATCC 700851 / DSM 12094 / M7) | METVM00237 | C9REV8 | Oligosaccharyl transferase STT3 subunit |
| [A] Methanococcus aeolicus (strain Nankai-3 / ATCC BAA-1280) | META301392 | A6UWW3 | Oligosaccharyl transferase STT3 subunit precursor |
| [A] Methanococcus maripaludis | METMP01424 | Q6LXC8 | Oligosaccharyl transferase, STT3 subunit |
| [A] Methanococcus maripaludis (strain C5 / ATCC BAA-1333) | METM500154 | A4FWA0 | Oligosaccharyl transferase, STT3 subunit precursor |
| [A] Methanococcus maripaludis (strain C6 / ATCC BAA-1332) | METM601235 | A9A9N9 | Oligosaccharyl transferase STT3 subunit precursor |
| [A] Methanococcus maripaludis (strain C7 / ATCC BAA-1331) | METM700662 | A6VH10 | Oligosaccharyl transferase STT3 subunit precursor |
| [A] Methanococcus vannielii (strain SB / ATCC 35089 / DSM 1224) | METVS00723 | A6UQ69 | Oligosaccharyl transferase STT3 subunit precursor |