Overexpression of luxS Cannot Increase Autoinducer-2 Production, Only Affect the Growth and Biofilm Formation in Streptococcus suis
Figure 2
Growth-dependent AI-2 production by HA9801 and luxS+. The HA9801 and luxS+ were inoculated to THB media and cultured at 37°C. The OD600 of the culture was determined every hour to generate the growth curve. The ● and Δ indicate the parental and the luxS+ strains, respectively. Statistical analysis showed that at 7–14 h, indicating that the luxS+ strain exhibited lagged growth relative to the WT strain. At various time points, AI-2 activity (left axis; column) is expressed as the fold induction of relative light units by comparing the level of luminescence to that induced by sterile medium. Values are means from three independent experiments.
