| P00573 | n/a | 1s77 | POP | D | 901 | e1s77D1 | helical bundle in Bacillus stearothermophilus-like DNA polymerase I | helical bundle in Bacillus stearothermophilus-like DNA polymerase I | helical bundle in Bacillus stearothermophilus-like DNA polymerase I | RNA_pol |
| P00573 | n/a | 1s77 | POP | D | 901 | e1s77D2 | Alpha-beta plaits | Adenylyl and guanylyl cyclase catalytic domain-like | Adenylyl and guanylyl cyclase catalytic domain-like | RNA_pol |
| P00573 | n/a | 1s77 | POP | D | 901 | e1s77D4 | inserted helical bundle subdomain in T7 RNA polymerase | inserted helical bundle subdomain in T7 RNA polymerase | inserted helical bundle subdomain in T7 RNA polymerase | RNA_pol |