| M | PQQ_2 | e3rifM1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| N | UvrB_inter | e3rifN1 | A: alpha bundles | X: Anticodon-binding domain of Class II aaRS | H: Anticodon-binding domain of Class II aaRS | T: Anticodon-binding domain of Class II aaRS | F: UvrB_inter | ECOD (develop294) |
| O | Glyco_hydro_2 | e3rifO5 | A: alpha bundles | X: Fusion glycoprotein F2 | H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | F: Glyco_hydro_2 | ECOD (develop294) |
| L | PQQ_2 | e3rifL1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| K | PQQ_2 | e3rifK1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| F | | e3rifF1 | A: alpha bundles | X: Tautomerase/MIF-like | H: Tautomerase/MIF | T: Catalytic domain of hepatitis C virus NS2-3 protease | F: | ECOD (develop294) |
| F | RhaA | e3rifF2 | A: alpha bundles | X: jelly-roll | H: Double-stranded beta-helix | T: Double-stranded beta-helix | F: RhaA | ECOD (develop294) |
| H | Cadherin | e3rifH3 | A: alpha bundles | X: Fusion glycoprotein F2 | H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | F: Cadherin | ECOD (develop294) |
| I | BT_3987-like_N | e3rifI3 | A: alpha bundles | X: Fusion glycoprotein F2 | H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | F: BT_3987-like_N | ECOD (develop294) |
| J | BT_3987-like_N | e3rifJ3 | A: alpha bundles | X: Fusion glycoprotein F2 | H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | F: BT_3987-like_N | ECOD (develop294) |
| G | Cadherin | e3rifG3 | A: alpha bundles | X: Fusion glycoprotein F2 | H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase | F: Cadherin | ECOD (develop294) |
| A | PQQ_2 | e3rifA1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| B | PQQ_2 | e3rifB1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| C | PQQ_2 | e3rifC1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| D | PQQ_2 | e3rifD1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |
| E | PQQ_2 | e3rifE1 | A: alpha bundles | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: PQQ_2 | ECOD (develop294) |