Table 4 Comparison of Ich and Tetrahymena membrane transporters according to TC class, superfamily and substrate type
| Â | Number of transporters in Ich (percentage of total transporters) | Number of transporters in Tetrahymena(percentage of total transporters) |
|---|---|---|
TC class | Â | Â |
   1. Channels | 155 (32) | 418 (38) |
   2. Secondary carriers | 191 (40) | 386 (36) |
   3. Primary active transporters | 131 (27) | 269 (25) |
   9. Poorly characterized transporters | 6 (1) | 13 (1) |
   Total | 483 | 1086 |
TC superfamily | Â | Â |
   VIC | 116 (24) | 396 (36) |
   APC | 7 (1) | 64 (6) |
   MFS | 75 (16) | 146 (13) |
   MC | 38 (8) | 43 (4) |
   CPA | 16 (3) | 20 (2) |
   ABC | 40 (8) | 159 (15) |
   P-ATPase | 65 (13) | 91 (8) |
Substrate type | Â | Â |
   Inorganic molecules | 249 (51) | 500 (53) |
   Carbon sources | 54 (11) | 77 (8) |
   Drugs, toxins, macromolecules | 77 (16) | 155 (17) |
   Vitamins, co-factors | 15 (3) | 23 (2) |
   Nucleotide bases and derivatives | 21 (4) | 26 (3) |
   Amino acids and derivatives | 34 (7) | 49 (5) |
   Unknown | 38 (8) | 110 (12) |