Table 2.

Comparison of Zn transporters produced by N. gonorrhoeae (Ngo) and N. meningitidis (Nme).

Name		Ligand/metal		Zur regulation		Fur regulation		Other observations
Ngo	Nme	Ngo	Nme	Ngo	Nme	Ngo	Nme	Ngo	Nme
TdfH	CbpAa	Cp/Znb	Cp/Zna	Yesb	Yesc,a	Nob	Nod	Regulated by MisRSb,e	Regulated by MisRSa
TdfJ	ZnuDf	Zng,b	Zng,f,h	Yesb	Yesc,f	Yesb (iron activated)	Nod	Contains consensus heme-binding motif	Elicits bactericidal antibodiesf

^aStork et al. (2013)

^bJean et al. (2016)

^cPawlik et al. (2012)

^dGrifantini et al. (2003)

^eRegulation only demonstrated in gonococcal strain FA19, not in FA1090.

^fStork et al. (2010)

^gUnknown whether free or protein-complexed Zn is ligand for TdfJ.

^hCalmettes et al. (2015)