Cacao

First, GO terms that involve the word "binding" are generally not allowed unless it is important to the function of the protein. In this case, figure 2 only shows the location of the luxR gene on the lux operon as well as the genomic organization of the strains used in the study. No information for the protein has been provided by this figure alone. However, the second paragraph below the figure you mentioned explains the results as follows, "we used control strains to test our experimental setup. First, we generated strain JHK007, which is isogenic to the test strains but lacks a luxR variant (Fig 2A). JHK007 produces little or no detectable bioluminescence, with background determined using the dark ΔluxCDABEG mutant EVS102. More importantly, JHK007 does not induce bioluminescence in response to 3OC6-HSL or C8-HSL." Hence, the GO ID should be changed to GO:0008218 which is "bioluminescence".