Table 1.

Predicted localization of 17 T4SS proteins essential for DNA secretion by N. gonorrhoeae and the corresponding homologous proteins from the F-plasmid T4SS and P-type T4SSs.

N. gonorrhoeae T4SS	F-plasmid T4SS	P-type T4SSs
TraC (CP)	TraC (CP)	VirB4 (CP/IM/PP)
TraE (CP/IM/PP)	TraE (CP/IM/PP)	VirB8 (CP/IM/PP)
TraG (CP/IM/PP)	TraG (CP/IM/PP)	VirB6 (CP/IM/PP)
TraL (CP/IM)	TraL (CP/IM)	VirB3 (CP/IM)
TraF (PP)	TraF(PP)
TraH (PP)	TraH (PP)
TraU (PP)	TraU (PP)
TraW (PP)	TraW (PP)
TrbC (PP)	TrbC (PP)
DsbC (PP)
AtlA (PP/PG)
LtgX (PP/PG)	Orf169 (PP/PG)	VirB1 (PP/PG)
Yag (PP/PG)
TraB (CP/IM/PP/OM)	TraB (CP/IM/PP/OM)	VirB10 (CP/IM/PP/OM)
TraK (PP/OM)	TraK (PP/OM)	VirB9 (PP/OM)
TraV (PP/OM)	TraV (PP/OM)	VirB7 (PP/OM)
TraN (PP/OM)	TraN (PP/OM)
		VirB11 (CP)

CP cytoplasm, IM inner membrane, PP periplasm, PG associated with peptidoglycan, OM outer membrane.