Figure 5: The PIC model of Pol II.
From: The X-ray crystal structure of the euryarchaeal RNA polymerase in an open-clamp configuration

(a) Pol II, GTFs and DNA are depicted by surface, cartoon and cpk models, respectively. Insertions specific and nonspecific to Pol II are indicated in red and pink, respectively. Each GTF is denoted by a unique colour and labelled. (b) The Pol II and TFIIF interactions in the PIC. Pol II and TFIIF are depicted by surface and cartoon models, respectively. Rpb2 and Rpb9 are in white and yellow, respectively, and all other subunits are in grey. Subunits and domains of TFIIF are labelled. Four insertions participated in the TFIIF binding are indicated. This PIC model is adapted from ref. 37.