Figure 4

AI-2 QS regulates galactose metabolism. A–F Relationships between the expression of galR, galE, galK, galT, cps2G, and cps2E in S. suis grown in CDM-Gal with or without 4 μM AI-2 were quantified by qRT‒PCR with 16S rRNA as an internal standard. *P < 0.05; **P < 0.01; ***P < 0.001 (Student’s unpaired t test). G, (panel a) The CPS components of S. suis (WT). G, (panel b) The CPS components of S. suis (ΔluxS). G, (panel c) The CPS of S. suis (ΔluxS + AI-2).