Fig. 1.

Examples of lux gene order of bioluminescent bacterial strains (adapted from Fig. 2 in Dunlap P. Bioluminescence: Fundamentals and Applications in Biotechnology - Volume 1. 2014 [6]). According to Table 1 (supplement) and available gene sequences and orders, the five most divergent bacterial strains (Vibrio harveyi, Aliivibrio fischeri, Photobacterium mandapamensis, Photobacterium leiognathi and Photorhabdus luminescens) were chosen to represent lux operon constellations. The color code of individual genes is also used for the corresponding protein models in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8. The arrow above luxR indicates that its reading frame is oriented in the opposite direction (individual operon not directly linked to the lux operon).