Table 3.
Possible sources of serine deaminase in organisms containing TrpEb_2
| Serine deaminases | Threonine deaminases | |||
| Organisms | Fe-S* | PLP* | TdcA* | IlvA* |
| Pyrococcus horikoshii | - | - | - | - |
| Pyrococcus furiosus | - | - | - | - |
| Pyrococcus abyssi | - | - | - | - |
| Methanobacterium thermoautotrophicum | - | - | - | - |
| Thermoplasma acidophilum | - | - | + | - |
| Thermoplasma volcanium | - | - | + | - |
| Ferroplasma acidarmanus | - | - | + | - |
| Methanosarcina barkeri | - | - | - | - |
| Archaeoglobus fulgidus | - | - | - | - |
| Pyrobaculum aerophilum | - | - | + | - |
| Aeropyrum pernix | - | - | + | - |
| Sulfolobus solfataricus | - | - | + | - |
| Aquifex aeolicus | - | - | - | - |
| Thermotoga maritima | - | - | + | - |
| Mycobacterium smegmatis | + | - | + | - |
| Chlorobium tepidum | - | - | - | - |
| Geobacter sulfurreducens | - | - | + | - |
| Rhodopseudomonas palustris | - | - | + | - |
*Sequences that were used to query the databases at NCBI [38], at JGI [39] for Fac and Mba, and at ERGO [40] for Paer and Rpa were gi 2501150 (iron-sulfur (Fe-S) serine deaminases), gi 134387 (PLP-dependent serine deaminases), gi 135723 (catabolic threonine deaminase), and gi 135720 (biosynthetic threonine deaminase).