Table 2.
General features of Acidicaldus sp. strain DX-1 in comparison with other heterotrophic acidophiles.
| Organism | Acidicaldus sp. strain DX-1 | Acidiphilium cryptum JF-5 | Acidiphilium multivorum AIU301 | Acetobacter pasteurianus |
|---|---|---|---|---|
| Isolated from | Acid effusion of mill tailing | Acidic Sediments | Pyritic acid mine drainage | Spontaneous cocoa bean heap fermentation |
| Temperature range | Moderate thermophilic (50~55°C) | Mesophilic (30~35°C) | Mesophilic (30–35°C) | Mesophilic (25–30°C) |
| pH range | 2.5–3.0 | 3.0–3.5 | 3.0–3.5 | 5.4–6.3 |
| Nutrition type | Heterotrophic | Heterotrophic | Heterotrophic | Heterotrophic |
| Oxygen requirement | Facultatively anaerobic | Facultatively anaerobic | Facultatively anaerobic | Obligately aerobic |
| Fe(III) reduction | Yes | Yes | Yes | No |
| Sulfur oxidation | Yes | No | No | No |
| Genome size (Mb) | 2.99 | 3.39 | 3.75 | 2.91 |
| GC content | 68.48% | 67.99% | 67.58% | 53.04% |
| Protein-coding genes | 3259 | 3063 | 3448 | 2875 |
| rRNA operon | 1 | 2 | 2 | 5 |
| Number of tRNAs | 43 | 47 | 48 | 57 |