(A) Nucleic-acid scaffold. Pink, nontemplate strand; red, template strand; magenta, UpCpGpA; violet, extended -10 element; blue, -10 element; light blue, discriminator element.
(B-C) TAP-RPo (ribbons in B; surfaces in C; β′ nonconserved region omitted for clarity). Cyan, TAP; yellow, σ; white, green, gray, and dark gray, RNAP αNTD, αCTD, β, and β′. Other colors as in A. Dashed lines, αNTD-αCTD linkers.
(D) Comparison of TAP-DNA in TAP-RPo (colors as in B-C) to CAP-DNA (gray; 6).
(E) Comparison of transcription bubble and downstream dsDNA in TAP-RPo (colors as in B-C) to corresponding DNA segments in RPo (cyan; 7).