TCDB is operated by the Saier Lab Bioinformatics Group
TCIDNameDomainKingdom/PhylumProtein(s)
*2.A.11.1.1









[Citrate or D-isocitrate]•M2+ (Mg2+ preferring):H+ symporter, CitM (transports Mg2+, Mn2+, Ni2+, Co2+ & Zn2+).  Regulated by the CitS/CitT two component system (Yamamoto et al. 2000; Repizo et al. 2006).

Bacteria
Firmicutes
CitM of Bacillus subtilis
*2.A.11.1.2









[Citrate]•M2+ (Ca2+ preferring):H+ symporter, CitH (transports Ca2+, Ba2+ & Sr2+).
Bacteria
Firmicutes
CitH of Bacillus subtilis
*2.A.11.1.3









Citrate•Me2+ (Fe2+/Mn2+ preferring):H+ symporter, CitM
Bacteria
Firmicutes
CitM of Streptococcus mutans (AAN58714)
*2.A.11.1.4









Citrate-M2+ (Fe3+ preferring): H+ symporter, Cit (transports Fe3+, Ca2+, Pb2+, Ba2+ and Mn2+, but not Mg2+, Ni2+ or Co2+) (Lensbouer et al., 2008).
Bacteria
Actinobacteria
Cit of Streptomyces coelicolor (Q9S242)
*2.A.11.1.5









Uncharacterized transporter YraO
Bacteria
Firmicutes
YraO of Bacillus subtilis
*2.A.11.1.6









Citrate-inducible divalent cation:citrate uptake transporter, CitH.  Can use Ca2+ or Sr2+ but not Mg2+ as the cotransported cation; The CitAB two component sensor kinase/response regulator system mediates induction by citrate (Brocker et al. 2009).

Bacteria
Actinobacteria
CitH of Corynebacterium glutamicum
*2.A.11.2.1









Putative transporter
Bacteria
Firmicutes
Putative transporter of Leuconostoc mesenteroides (Q03YV5)
*2.A.11.2.2









Uncharacterized protein of 429 aas

Bacteria
Spirochaetes
UP of Treponema lecithinolyticum
*2.A.11.2.3









Uncharacterized protein of 447 aas

Bacteria
Actinobacteria
UP of Nocardiopsis dassonvillei (Actinomadura dassonvillei)