Comparison of Amino Acid Frequency and Codon Choice of Thermophilic and Nonthermophilic Bacteria
| Amino acid codons bacterium | (C + G)% | Specific codons/1000 codons | |||||||||
| glycine | glutamic | aspartic | lysine | arginine | |||||||
| GGR | GGY | total | GAR | GAY | AAR | AGR | CGR | CGY | total | ||
| Thermophilic | |||||||||||
| M. thermoautotrophicum | 49.5 | 38.2 | 41.4 | 79.6 | 81.5 | 59.1 | 45.6 | 53.3 | 5.8 | 8.4 | 67.4 |
| A. fulgidus | 48.5 | 41.2 | 31 | 72.2 | 88.7 | 48.7 | 68.3 | 51.7 | 2.4 | 3.3 | 57.4 |
| A. aeolicus | 43.4 | 43.5 | 23.6 | 67.1 | 96.2 | 43 | 94.1 | 44.9 | 1.3 | 2.7 | 49 |
| M. jannaschii | 31.4 | 48.8 | 17.2 | 66.1 | 86.2 | 54.9 | 103.6 | 37.4 | 0.5 | 0.4 | 38.3 |
| Mean | 42.9 | 28.3 | 71.2 | 88.1 | 51.4 | 77.9 | 46.8 | 2.5 | 3.7 | 53 | |
| Nonthermophilic | |||||||||||
| E. coli | 50.7 | 20.5 | 52.5 | 73 | 56.9 | 51.4 | 45.5 | 5 | 10 | 40.8 | 55.7 |
| M. pneumoniae | 40 | 15.3 | 39.6 | 54.9 | 56.8 | 49.4 | 85.2 | 6.8 | 7.5 | 20.5 | 34.9 |
| H. influenzae | 38.1 | 18.4 | 48.2 | 66.6 | 63.8 | 49.8 | 63.8 | 4.6 | 6.6 | 33.3 | 44.4 |
| M. genitalium | 32 | 18.2 | 27.9 | 46.1 | 56.6 | 49 | 94.6 | 18.7 | 2.4 | 9.9 | 31 |
| Mean | 18.1 | 42 | 60.1 | 58.5 | 49.9 | 72.3 | 8.8 | 6.6 | 26.1 | 41.5 | |
| Pvalue[i] | 0.003 | 0.03 | 0.09 | 0.0005 | 0.68 | 0.61 | 0.01 | 0.01 | 0.03 | 0.06 | |
[i] The probabilities that differences between the means could have occurred by chance (paired t-tests).