Table 1. A summary of Tat translocase subunits (A/E, B, C) present in each bacterial class surveyed for this study and the most common arrangement of these genes in tat operons.
Bacterial Class | Total species identified | Total number of genes identified in class | tat operon§ arrangement | ||
tatA/E | tatB | tatC | |||
Actinobacteria | 118 | 152 | 78 | 118 | AC ↔ (B/A) |
Bacilli | 51 | 57 | 1 | 58 | AC ↔ (AC) |
Clostridia | 29 | 59 | 7 | 29 | AC |
Deinococci | 14 | 35 | 72 | 15 | AC |
α-proteobacteria | 129 | 148 | 121 | 131 | ABC or C↔A |
β-proteobacteria | 76 | 91 | 74 | 80 | ABC |
γ-proteobacteria | 166 | 232 | 146 | 170 | A2BC(D) |
δ-proteobacteria | 37 | 76 | 23 | 39 | (A/B)C ↔ (A) |
ε-proteobacteria | 24 | 21 | 9 | 24 | BC ↔ A |
Chloroflexi | 14 | 361 | 9 | 15 | A2BC |
Planctomycetia/Phycisphaerae | 5 | 9 | 0 | 5 | C ↔ A2 |
Chlamydiae | 2 | 2 | 0 | 2 | AC |
Aquificae | 9 | 17 | 8 | 9 | A2BC |
Bacteroidetes | 44 | 61 | 3 | 45 | AC ↔ (A/B) |
Cyanobacteria | 15 | 22 | 3 | 17 | C ↔ A2 |
Deferribacteres | 4 | 8 | 3 | 4 | BC ↔ A2 |
Fusobacteria | 2 | 2 | 1 | 2 | C(B)A |
Gemmatimonadetes | 1 | 1 | 0 | 1 | C ↔ A |
Chlorobia/Ignavibacteria | 11 | 11 | 0 | 11 | C ↔ A |
Negativicutes | 5 | 5 | 0 | 5 | AC |
Nitrospira | 3 | 6 | 0 | 3 | C ↔ A2 |
Acidobacteria/Solibacteres | 6 | 9 | 3 | 6 | (B)C ↔ A2 |
Sphingobacteria | 8 | 8 | 0 | 8 | C ↔ A |
Spirochaetes | 4 | 4 | 0 | 4 | AC |
Thermodesulfobacteria | 2 | 2 | 0 | 2 | AC |
Verrucomicrobia | 4 | 8 | 0 | 4 | C ↔ A2 |
tat genes are listed as single letters A to C and combinations written together indicate their presence at the same tat operon locus. Bidirectional ↔ arrows indicate that the Tat component genes are not found in the same operon (separate loci). tat genes (A, B or C) found in parentheses indicate an optional occurrence in the tatC locus.