| I2WBK2 | n/a | 7jz2 | 3PE | C | 1301 | e7jz2D1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| I2WBK2 | n/a | 7jz2 | 3PE | G | 202 | e7jz2H1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| I2WBK2 | n/a | 7jz2 | 3PE | K | 202 | e7jz2L1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |