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TCID	Name	Domain	Kingdom/Phylum	Protein(s)
2.A.39.1.1	Cytosine permease	Bacteria	Proteobacteria	CodB of E. coli (P0AA82)
2.A.39.1.2	The putative hydroxymethylpyrimidine transporter, CytX (Rodionov et al. 2002)	Bacteria	Proteobacteria	CytX of Pseudomonas putida (B1JAG2)
2.A.39.1.3	The putative hydroxymethylpyrimidine porter, CytX (Rodionov et al., 2002)	Bacteria	Proteobacteria	CytX of Neisseria meningitidis (A1KWE6)
2.A.39.1.4	Putative nucleobase transporter	Bacteria	Firmicutes	Putative nucleobase transporter of Alicyclobacillus acidocaldarius (F8IKT4)
2.A.39.1.5	Putative purine-cytosine permease yxlA	Bacteria	Firmicutes	yxlA of Bacillus subtilis
2.A.39.1.6	Putative transmembrane protein	Bacteria	Actinobacteria	Putative transmembrane protein of Streptomyces coelicolor
2.A.39.1.7	Putative transmembrane transport protein	Bacteria	Actinobacteria	Putative transmembrane transport protein of Streptomyces coelicolor
2.A.39.2.1	Cytosine-purine permease	Eukaryota	Fungi	Fcy2 of Saccharomyces cerevisiae (P17064)
2.A.39.2.2	The vitamin B₆:H⁺ symporter, Tpn1 (pyridoxine, pyridoxal and pyridoxamine are substrates) (Stolz and Vielreicher, 2003)	Eukaryota	Fungi	Tpn1 of Saccharomyces cerevisiae (P53099)
2.A.39.2.3	The hypoxanthine/adenine/guanine (purine) transporter, Fcy21 (Goudela et al., 2006)	Eukaryota	Fungi	Fcy21 of Candida albicans (Q708J7)
2.A.39.2.4	The cytosine-purine-scavenging protein, FcyB (low capacity, high affinity; 45% identical and maybe orthologous to the yeast purine-cytosine protein (2.A.39.2.3) (Vlanti and Diallinas 2008). Substrate docking and mutational analyses have revealed residues essential for specificity and function (Krypotou et al. 2012). The substrate specificities and phylogenies of members of the NCS1 family have been reported (Krypotou et al. 2015).	Eukaryota	Fungi	FycB of Aspergillus nidulans (B1PXD0)
2.A.39.3.1	Allantoin permease	Eukaryota	Fungi	Dal4 of Saccharomyces cerevisiae
2.A.39.3.2	Uracil/uridine permease	Eukaryota	Fungi	Fur4 of Saccharomyces cerevisiae
2.A.39.3.3	Uridine (nucleoside; fluorouridine; not uracil or allantoin) permease, Fui1 (Uridine:H⁺ (1:1) symporter) (inhibited by analogues with modifications at positions C5') (Zhang et al., 2006)	Eukaryota	Fungi	Fui1 (YBL042; YBC2) of Saccharomyces cerevisiae
2.A.39.3.4	Allantoin permease, PucI, with 12 TMSs and both N- and C-termini on the inside. PucI transports allantoin with a Km of 24 mμM, but recognizes some additional hydantoin compounds, including hydantoin itself, and to a lesser extent a range of nucleobases and nucleosides (Ma et al. 2016).	Bacteria	Firmicutes	PucI (YwoE) of Bacillus subtilis
2.A.39.3.5	The probable hydantoin permease, HyuP (most similar to the hydantoin transporter of Microbacterium liquefaciens; Suzuki and Henderson, 2006)	Bacteria	Actinobacteria	HyuP of Arthrobacter aurescens (Q9F467)
2.A.39.3.6	The benzyl-hydantoin:cation symporter-1, Mhp1 (84% identical to 2.A.39.3.5). The 3-d structures in the open and closed states (2.85 Å resolution) are known (Weyand et al., 2008). Models of the ion-coupled coonformational cycle have been proposed (Kazmier et al. 2014).	Bacteria	Actinobacteria	Mhp1 of Microbacterium liguefaciens (2JLN_A) (210060745)
2.A.39.3.7	Uracil permease	Eukaryota	Fungi	Fur4 of Schizosaccharomyces pombe
2.A.39.3.8	Allantoin permease; encoded in an operon with allantoinase and other degradative enzymes (Moraes and Reithmeier 2012).	Bacteria	Proteobacteria	YbbW of Escherichia coli
2.A.39.3.9	NCS-1 homologue of unknown function and of 652 aas with 14 TMSs in a 2 + 2 + 2... arrangment.	Eukaryota	Bangiophyceae	NCS-1 homologue of Galdieria sulphuraria
2.A.39.3.10	Uracil uptake porter, FurD of 544 aas (Krypotou et al. 2015).	Eukaryota	Fungi	FurD of Emericella nidulans (Aspergillus nidulans)
2.A.39.3.11	Purine/uracil uptake porter of 599 aas and 12 TMSs, NCS1 or PLUTO. Nucleobase:proton symporter that facilitates the uptake of nucleobases in the cells. Can transport adenine, guanine and uracil (Witz et al. 2014). Contributes to uracil import into plastids for plastidic uracil salvage which is essential for plant growth and development (Witz et al. 2012).	Eukaryota	Viridiplantae	PLUTO of Arabidopsis thaliana (Mouse-ear cress)
2.A.39.3.12	NCS1 of 540 aas and 12 TMSs. Transports adenine, guanine, hypoxanthine, cytosine, and allantoin and competitively binds xanthine and uric acid. The closely related Zea mays NCS1 transports adenine, guanine, and cytosine and competitively binds, 5-fluorocytosine, hypoxanthine, xanthine, and uric acid. The differences in these NCS1 profiles are due to a limited number of amino acid differences (Rapp et al. 2016).			NCS1 of Setaria viridis (Green bristlegrass) (Setaria italica subsp. viridis)
2.A.39.3.13	Uracil-specific permease of 581 aas and 11 or 12 TMSs. FUR4. Deletion of the FUR4 gene confers resistance to 5-fluorouracil as well as cross-resistance to triazoles and imidazole antifungal agents when they are used simultaneously with 5-fluorouracil although the nucleobase transporters are not involved in azole uptake. Only fluorinated pyrimidines, not pyrimidines themselves, are able to promote cross-resistance to azoles by both the salvage and the de novo pathway of pyrimidine synthesis. Subinhibitory doses of 5-fluorocytosine, 5-fluorouracil, and 5-fluorouridine also trigger resistance to fluconazole in susceptible wild-type strains of C. lusitaniae and of different Candida species. Thus, intracellular fluorinated nucleotides play a role in azole resistance, either by preventing azoles from targeting the catalytic site of lanosterol 14-alpha-demethylase or by acting as a molecular switch for the triggering of efflux transport (Gabriel et al. 2014; ).	Eukaryota	Fungi	FUR4 of Clavispora lusitaniae (Candida lusitaniae)
2.A.39.3.14	NCS1 of 528 aas and 12 TMSs. Transporter of adenine, guanine, uracil and allantoin (Schein et al. 2013).	Eukaryota	Viridiplantae	NCS1 of Chlamydomonas reinhardtii (Chlamydomonas smithii)
2.A.39.3.15	Uptake porter for allantoin, uric acid (urate) and uracil and related analyogues, FurE of 527 aas and 12 TMSs. Evidence has been presented that both the C- and/or N-terminal domains are involved in intramolecular dynamics critical for substrate selection (Papadaki et al. 2017).	Eukaryota	Fungi	FurE of Emericella nidulans (Aspergillus nidulans)
2.A.39.4.1	Thiamine permease, Thi10	Eukaryota	Fungi	Thi10 of Saccharomyces cerevisiae
2.A.39.4.2	The nicotinamide riboside transporter, Nrt1 (Belenky et al., 2008)	Eukaryota	Fungi	Nrt1 of Saccharomyces cerevisiae (Q08485)
2.A.39.5.1	The putative mannitol porter, MtlP (Rodionov et al. 2010).	Bacteria	Proteobacteria	MtlP of Shewanella frigidimarina (Q082R8)