| E | PQQ_2 | e6tjbE1 | A: alpha arrays | X: Immunoglobulin-like beta-sandwich | H: Immunoglobulin-related | T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like | F: PQQ_2 | ECOD (v295) |
| D | PQQ_2 | e6tjbD1 | A: alpha arrays | X: Immunoglobulin-like beta-sandwich | H: Immunoglobulin-related | T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like | F: PQQ_2 | ECOD (v295) |
| C | PQQ_2 | e6tjbC1 | A: alpha arrays | X: Immunoglobulin-like beta-sandwich | H: Immunoglobulin-related | T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like | F: PQQ_2 | ECOD (v295) |
| B | PQQ_2 | e6tjbB1 | A: alpha arrays | X: Immunoglobulin-like beta-sandwich | H: Immunoglobulin-related | T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like | F: PQQ_2 | ECOD (v295) |
| A | ATP-synt_C | e6tjbA1 | A: alpha arrays | X: HTH | H: HTH | T: Three-helical HTH | F: ATP-synt_C | ECOD (v295) |