Figure 1. Recombination modules and regulatory features of integrase genes in lambda and KplE1 prophages.

Regulatory features of the lambda integrase were adapted from [1]. Promoters of interest are indicated with black arrows; in the case of the non-characterized PtorI promoter, the arrow is a dotted line. The E. coli chromosome is in red, whereas the prophages' genomes are in blue. The orientation of the genes is indicated with large arrows. Repression is represented by red lines, and the proteins involved in repression are indicated by circles (I, TorI; S, IntS; CI). Transcription patterns for the integrated state (light gray) and for the excising state (dark gray) are illustrated.