Figure 4.

Key interaction features of the PhCas6nc–Pf7 RNA complex. The two subunits of PhCas6nc are represented by surface (left) or stick models (right) and the RNA are shown by red (or orange) stick models. The same repeat RNA interacts with two different PhCas6nc subunits (A and B, respectively) that are distinguished by teal surface (or grey–blue–red stick models) and green surface (or cyan–blue–red stick models), respectively. Contacts between RNA and protein atoms of shorter than 3.4 Å are indicated by dashed lines. The reverse Hoogsteen pair between A6 of one RNA and U3 of the other RNA (orange) is also depicted.