| 1Q5V | A:49-132; B:49-133; C:49-132; D:49-132 | APO-NIKR |
| 1Q5Y | A:; B:; C:; D: | NICKEL-BOUND C-TERMINAL REGULATORY DOMAIN OF NIKR |
| 2HZA | A:49-131; B:49-131 | NICKEL-BOUND FULL-LENGTH ESCHERICHIA COLI NIKR |
| 2HZV | A:49-131; B:49-131; C:49-131; D:49-131; E:49-131; F:49-131; G:49-131; H:49-131 | NIKR-OPERATOR DNA COMPLEX |
| 3BKF | A:49-131 | ZINC-BOUND C-TERMINAL DOMAIN OF NIKR |
| 3BKT | A:; B:; C:; D: | COPPER-BOUND C-TERMINAL DOMAIN OF NIKR |
| 3BKU | A:; B:; C:; D: | APO C-TERMINAL DOMAIN OF NIKR |
| 3OD2 | A:49-132; B:49-132 | E. COLI NIKR SOAKED WITH EXCESS NICKEL IONS |
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