. 2011 Sep;193(18):4652–4663. doi: 10.1128/JB.05293-11

Table 1.

Inventory of possible and absent zinc transport systems in C. metallidurans strain CH34

Name	Rmet no.^a	Transporter family^b	Possible function^c	Reference(s)
Uptake systems
CorA₁	Rmet_3052	MIT, TC 1.A.35	Importer for divalent metal cations; Mg²⁺ regulation
CorA₂	Rmet_0036	MIT, TC 1.A.35	Importer for divalent metal cations; no Mg²⁺ regulation
CorA₃	Rmet_3287	MIT, TC 1.A.35	Importer for divalent metal cations; no Mg²⁺ regulation
ZupT	Rmet_2621	ZIP, TC 2.A.5	Uptake of Zn²⁺ and other cations under conditions of low zinc concentrations
HoxN	Rmet_1533	NiCoT, TC 2.A.52	Ni²⁺, Co²⁺, synthesis of hydrogenases.
PitA	Rmet_1973	PiT, TC 2.A.20	Phosphate-metal cation complexes: Zn²⁺, Co²⁺, Ni²⁺, Cd²⁺
MgtE	Absent	MgtE, TC 9.A.19	Possible substrates Mg²⁺, Co²⁺
MntH	Absent	NRAMP, TC 2.A.55	Possible substrates Mn²⁺, Fe²⁺, Cd²⁺, Co²⁺, Ni²⁺
ZnuABC	Absent	ABC, TC 3.A.1	High-affinity uptake of zinc under conditions of zinc starvation
MgtA	?	P type, TC 3.A.3	Primary uptake system for Mg²⁺ and other divalent cations
Efflux systems
CzcA	Rmet_5980	RND, TC 2.A.6	Together with CzcB and CzcC, outer membrane efflux of Zn²⁺; other substrates Cd²⁺ and Co²⁺	10, 39, 51
CzcP	Rmet_5970^d	P-type, TC#3.A.3	High V_max efflux of loosely bound Zn²⁺; other substrates Cd²⁺ and Co²⁺	51
ZntA	Rmet_4594	P type, TC 3.A.3	Efflux of tightly bound Zn²⁺; other substrate Cd²⁺	24, 51
PbrA	Rmet_5947	P type, TC 3.A.3	Efflux of tightly bound Pb²⁺; may use Zn²⁺ and Cd²⁺ as substrates	7, 51
CadA	Rmet_2303^d	P type, TC 3.A.3	Efflux of tightly bound Cd²⁺; may use Zn²⁺ as substrate	24, 51
CzcD	Rmet_5979	CDF, TC 2.A.4	Efflux of loosely bound Zn²⁺, other substrates Cd²⁺ and Co²⁺ (2, 3, 36, 51)
DmeF	Rmet_0198	CDF, TC 2.A.4	Efflux of Co²⁺; Zn²⁺ not substrate in vivo	32, 51
FieF	Rmet_3406	CDF, TC#2.A.4	Efflux of Fe²⁺; Zn²⁺ not substrate in vivo	32, 51
Unclear
ZntB	Rmet_0549	MIT, TC 1.A.35	Efflux or uptake of Zn²⁺?

References 57 and 58; http://genome.ornl.gov/microbial/rmet/.

http://www.tcdb.org/.

Possible substrates were predicted according to the situations in E. coli (38) and other bacteria (35).

Probably starts upstream of the annotated position (51).