| D | | e4an4D1 | A: alpha arrays | X: HTH | H: HTH | T: winged helix domain | F: | ECOD (v295.2) |
| D | Sec1 | e4an4D2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: Sec1 | ECOD (v295.2) |
| C | | e4an4C2 | A: alpha arrays | X: HTH | H: HTH | T: winged helix domain | F: | ECOD (v295.2) |
| C | Sec1 | e4an4C3 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: Sec1 | ECOD (v295.2) |
| B | | e4an4B1 | A: alpha arrays | X: HTH | H: HTH | T: winged helix domain | F: | ECOD (v295.2) |
| B | Sec1 | e4an4B2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: Sec1 | ECOD (v295.2) |
| A | | e4an4A2 | A: alpha arrays | X: HTH | H: HTH | T: winged helix domain | F: | ECOD (v295.2) |
| A | Sec1 | e4an4A3 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: Sec1 | ECOD (v295.2) |