Table 3.
Nucleotide Composition of the Genome, and of SSR Tracts, Distinguishing Among Coding and Noncoding Regions, for E. coli
| Nucleotide | Genome-wide | Coding | Noncoding | |||
| no. | % | no. | % | no. | % | |
| A. Nucleotide composition of genome | ||||||
| A | 1141 × 103 | 24.6 | 881 × 103 | 24.0 | 260 × 103 | 26.9 |
| C | 1178 × 103 | 25.4 | 955 × 103 | 26.0 | 224 × 103 | 23.1 |
| G | 1176 × 103 | 25.4 | 951 × 103 | 26.0 | 225 × 103 | 23.1 |
| T | 1139 × 103 | 24.6 | 879 × 103 | 24.0 | 261 × 103 | 26.9 |
| Total | 4636 × 103 | 100.0 | 3666 × 103 | 100.0 | 970 × 103 | 100.0 |
| B. Numbers of SSR tracts of given composition | ||||||
| Mononucleotide SSRs ≥6 bp | ||||||
| A | 2473 | 46.2 | 1521 | 45.5 | 952 | 47.3 |
| C | 191 | 3.6 | 125 | 3.7 | 66 | 3.3 |
| G | 186 | 3.5 | 111 | 3.3 | 75 | 3.7 |
| T | 2508 | 46.8 | 1587 | 47.5 | 921 | 45.7 |
| Total | 5358 | 100.0 | 3344 | 100.0 | 2014 | 100.0 |
| Dinucleotide SSRs ≥6 bp | ||||||
| AC/CA | 776 | 10.2 | 565 | 9.7 | 211 | 12.3 |
| AG/GA | 928 | 12.3 | 696 | 11.9 | 232 | 13.5 |
| AT/TA | 911 | 12.0 | 492 | 8.4 | 419 | 24.3 |
| CG/GC | 3274 | 43.2 | 2876 | 49.1 | 398 | 23.1 |
| CT/TC | 939 | 12.4 | 682 | 11.7 | 257 | 14.9 |
| GT/TG | 747 | 9.9 | 542 | 9.3 | 205 | 11.9 |
| Total | 7575 | 100.0 | 5853 | 100.0 | 1722 | 100.0 |
