Table 1.

Several common quorum-sensing systems.

Signal molecule of QS system	Core structure	Structure example	Pathway	Key protein	Bacteria
AHL		[14]	luxslR	LuxI, LuxR	Vibrio fischeri [15]
			LasIR-RhlIR	Lasl,LasR,RhlI,RhlR	Pseudomonas aeruginosa [16]
			ExpIR	ExpR,ExpI	Erwinia carotovora [16],Dickeya dadantii [17]
			SmaI/SmaR	PhoR,PhoB	Serratia sp. [18]
AIP		[19]	Agr	Agr A,Agr B,Agr C	Staphylococcus aureus [20],Listeria monocytogenes [21]
			Fsr	FsrA,FsrB,FsrC	Enterococcus faecalis [22],Staphylococcus aureus [23]
			Competitive quorum-sensing system	RapB,RapC, ComP, ComQ	Bacillus subtilis [16]
			Cytolysin quorum-sensing system	CylA, CylB,CylM	Enterococcus faecalis [22]
			Phr-peptide regulatory system	Opp,SecA	Bacillus subtilis [23]
			Extracellular protease processed AIP	plcR,OPP	Bacillus cereus [20]
AI-2		[24]	LuxS/AI-2	Pfs,LuxS	Vibrio harveyi [25],Streptococcus agalactiae [26], Haemophilus parasuis [27]
			Lsr	LsrK,LsrR	Escherichia coli [28]
Others			AI-3	ClpXP,Fis	Enterohemorrhagic Escherichia coli [29]
		[30]	DSF	RpfC,RpfG	Xanthomonas campestris [30],Xanthomonas oryzae [31]
		[30]	PQS	PqsR	Pseudomonas aeruginosa [32]
		[33]	IQS	AmbBCDE	Pseudomonas aeruginosa [33]