| 1 | 9OL3|1|A+ 9OL3|1|B (rep) |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | DNA-imidazolium-bridged dinucleotide intermediate complex | X-ray diffraction | 1.557 | 28 | 2025-10-22 | 
| 2 | 9OL2|1|A+ 9OL2|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-imidazolium-bridged dinucleotide intermediate complex | X-ray diffraction | 1.528 | 28 | 2025-10-22 | 
| 3 | 7KUP|1|A+ 7KUP|1|B |  | 5'-R((LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*(OMG))-3' | synthetic construct |  |  | 2'-OMe modification at 3' end of RNA primer complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 1.44 | 28 | 2021-09-08 | 
| 4 | 7KUK|1|A+ 7KUK|1|B |  | RNA (5'-R(*(LKC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | High resolution RNA primer complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 1.67 | 28 | 2021-09-08 | 
| 5 | 7KUM|1|A+ 7KUM|1|B |  | 5'-R((LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*(LCG)-3' | synthetic construct |  |  | LNA modification at 3' end of RNA primer complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 1.714 | 28 | 2021-09-08 | 
| 6 | 5UED|1|A+ 5UED|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*GP*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA primer-template complex with guanosine dinucleotide ligand G(5')pp(5')G | X-ray diffraction | 1.5 | 28 | 2017-07-05 | 
| 7 | 6C8J|1|A+ 6C8J|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-activated 2-AIpG monomer complex, 15 min soaking | X-ray diffraction | 1.5 | 28 | 2018-05-30 | 
| 8 | 8SWG|1|A+ 8SWG|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G*(GA3))-3') | synthetic construct |  |  | RNA duplex bound with GpppA dinucleotide ligand | X-ray diffraction | 1.5 | 28 | 2023-05-31 | 
| 9 | 7KUL|1|A+ 7KUL|1|B |  | DNA/RNA (5'-R(*(LKC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*C)-D(P*G)-3') | synthetic construct |  |  | DNA modification at 3' end of RNA primer complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 1.64 | 28 | 2021-09-08 | 
| 10 | 6C8D|1|A+ 6C8D|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-dGMP complex with Mg ion | X-ray diffraction | 1.92 | 28 | 2018-05-30 | 
| 11 | 6C8I|1|A+ 6C8I|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-activated 2-AIpG monomer complex, 5 min soaking | X-ray diffraction | 1.77 | 28 | 2018-05-30 | 
| 12 | 5UEE|1|A+ 5UEE|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*GP*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA primer-template complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 1.9 | 28 | 2017-07-05 | 
| 13 | 7KUO|1|A+ 7KUO|1|B |  | RNA (5'-R((LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*(GFL))-3') | synthetic construct |  |  | FANA modification at 3' end of RNA primer complex with guanosine dinucleotide ligand G(5')ppp(5')G | X-ray diffraction | 2.281 | 28 | 2021-09-08 | 
| 14 | 6C8L|1|A+ 6C8L|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-activated 2-AIpG monomer complex, 1h soaking | X-ray diffraction | 2.25 | 28 | 2018-05-30 | 
| 15 | 6C8E|1|A+ 6C8E|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-imidazolium-bridged intermediate complex, 4h soaking | X-ray diffraction | 1.8 | 28 | 2018-05-30 | 
| 16 | 6U8U|1|A+ 6U8U|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA duplex bound with TNA 3'-3' imidazolium dimer | X-ray diffraction | 2.4 | 28 | 2020-12-09 | 
| 17 | 6C8K|1|A+ 6C8K|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-activated 2-AIpG monomer complex, 30 min soaking | X-ray diffraction | 2.26 | 28 | 2018-05-30 | 
| 18 | 6CAB|1|A+ 6CAB|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA-dGMP complex with Sr ion | X-ray diffraction | 2.5 | 28 | 2018-05-30 | 
| 19 | 5UEF|1|A+ 5UEF|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*GP*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA primer-template complex with guanosine dinucleotide p(5')G(3')p(5')G ligand | X-ray diffraction | 2.1 | 28 | 2017-07-05 | 
| 20 | 5UEG|1|C+ 5UEG|1|D |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*GP*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA primer-template complex with guanosine dinucleotide G(5')pppp(5')G ligand | X-ray diffraction | 2.6 | 28 | 2017-07-05 | 
| 21 | 5UEG|1|A+ 5UEG|1|B |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*GP*AP*CP*UP*UP*AP*AP*GP*UP*CP*G)-3') | synthetic construct |  |  | RNA primer-template complex with guanosine dinucleotide G(5')pppp(5')G ligand | X-ray diffraction | 2.6 | 28 | 2017-07-05 | 
| 22 | 6OWL|1|A |  | RNA (5'-R(*(LCC)P*(LCC)P*(LCC)P*(LCG)P*AP*CP*UP*UP*AP*AP*GP*UP*CP*R)-3') | synthetic construct |  |  | RNA oligonucleotides with 3'-arabino guanosine co-crystallized with GMP | X-ray diffraction | 2 | 14 | 2020-02-26 |