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TCID	Name	Domain	Kingdom/Phylum	Protein(s)
2.A.8.1.1	D-Gluconate:H⁺ symporter of 448 aas and 11 TMSs. It is encoded in an operon with gluconate kinase (Fujita et al. 1986).	Bacteria	Firmicutes	GntP of Bacillus subtilis
2.A.8.1.2	L-Idonate/D-Gluconate:H⁺ symporter, IdnT, GntW, YjgT, of 439 aas and 11 or 12 TMSs. Also called the GNT-II system (Bausch et al., 1998; Gómez et al. 2011).	Bacteria	Proteobacteria	IdnT (GntW; YjgT) of E. coli
2.A.8.1.3	D-Fructuronate/D-gluconate:H⁺ symporter, GntP (Bates Utz et al., 2004)	Bacteria	Proteobacteria	GntP of E. coli (P0AC94)
2.A.8.1.4	High affinity D-Gluconate:H⁺ symporter, GntT (GntM, UsgA, YhgC) of 438 aas and 11 or 12 TMSs (Porco et al., 1997). It is regulated at the transcriptional level by GntR and Crp (Peekhaus and Conway 1998).	Bacteria	Proteobacteria	GntT of E. coli (P39835)
2.A.8.1.5	The D-serine transporter, DsdX (K_M=60µM) (may also transport D-threonine which inhibits D-serine uptake) (Anfora and Welch, 2006). Eliminating the dsdX gene renders the cell more sensitive to chloramphenicol (Duo et al. 2008).	Bacteria	Proteobacteria	DsdX of E. coli (P08555)
2.A.8.1.6	The putative D-glycerate transporter, GrtP. Regulated by glycerate-responsive regulator SdaR (Rodionov et al. 2011)	Bacteria	Proteobacteria	GrtP of Shewanella oneidensis (Q8EG39)
2.A.8.1.7	Inner membrane uptake permease, YgbN, of 454 aas and 14 TMSs. Multi-ion irradiation caused the generation of a ygbN mutant (Song and Luo 2012).	Bacteria	Proteobacteria	YgbN of Escherichia coli
2.A.8.1.8	Low-affinity (212 μM), gluconate-inducible, gluconate transporter (gluconate permease) (GntU/the Gnt-I system) (Tong et al. 1996). The gntU gene is in an operon with gntK, encoding a gluconate kinase (Tong et al. 1996). This system has been utilized for the production of pyruvate from gluconate (Yang et al. 2017).	Bacteria	Proteobacteria	GntU of Escherichia coli
2.A.8.1.9	Uncharacterized transporter HI_0092	Bacteria	Proteobacteria	HI_0092 of Haemophilus influenzae
2.A.8.1.10	D-glycerate transporter of 430 aas and 14 putative TMSs. The gene is next to and probably in the same operon with a gene encoding D-glycerate kinase.	Bacteria	Firmicutes	D-glycerate transporter of Enterococcus faecium
2.A.8.1.11	Putative gluconate analog transporter of 449 aas and 11 TMSs, YjhF.	Bacteria	Proteobacteria	YjhF of E. coli
2.A.8.1.12	The putative histidine porter, YuiF. Regulated by Histidine repressor HisR (Ravcheev et al. 2011)	Bacteria	Firmicutes	YuiF of Bacillus subtilis (O32105)
2.A.8.1.13	A putative propionate/butyrate/hydroxybutyrate transporter	Bacteria	Fusobacteria	Putative propionate permease of Fusobacterium nucleatum (gi 19704150)
2.A.8.1.14	Putative D-beta-hydroxy butyrate permease, BhbP	Bacteria	Firmicutes	BhbP of Bacillus cereus (Q81E21)
2.A.8.1.15	Gluconate porter of 463 aas and 13 TMSs, GntP (Letek et al. 2006; Porco et al. 2008).	Bacteria	Actinobacteria	GntP of Corynebacterium glutamicum (Brevibacterium saccharolyticum)