Figure 1.

Biological activities of lambdoid phage N and Q proteins.

Scheme of part of the phage λ genome (thick black line) containing early and late control regions. The sizes of regions and elements, and their positions, are not drawn to scale. Open boxes with names – protein-coding regions; narrow black boxes, nut site DNA; black-angled arrows, promoters; red stop signs, intrinsic (“i”) and ρ-dependent (“ρ”) terminators; green signs, regulatory regions active as DNA (QBE and SDPE); dark yellow boxes, nut regulatory regions active as RNA; cyan spheres, anti-termination proteins; cyan angled arrows, sites of recruitment of anti-termination proteins to ECs; dark yellow lines, transcripts. Scheme adapted from [43] with changes.