Table 1 The composition of individual amino acids and property groups in protein sequences of psychrophilic and mesophilic proteomes.
Amino Acids | Psychrophilesa | Mesophilesb | Â | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | P1 | P2 | P3 | P4 | P5 | P6 | Avg | SD | M1 | M2 | M3 | M4 | M5 | M6 | Avg | SD | t-test |
Ala (A) | 8.1 | 8.5 | 9.2 | 8.4 | 8.9 | 12.3 | 9.2 | 1.6 | 8.3 | 6.8 | 9.5 | 8.4 | 9.1 | 6.7 | 8.1 | 1.2 | 1.373 |
Cys (C) | 1.0 | 1.4 | 0.9 | 1.1 | 1.0 | 0.7 | 1.0 | 0.2 | 1.0 | 1.1 | 1.2 | 1.0 | 1.1 | 0.6 | 1.0 | 0.2 | 0.146 |
Asp (D) | 5.6 | 5.1 | 6.0 | 5.4 | 5.8 | 5.3 | 5.5 | 0.3 | 5.0 | 4.8 | 5.1 | 5.0 | 5.0 | 5.9 | 5.1 | 0.4 | 1.801 |
Glu (E) | 5.9 | 6.3 | 5.5 | 5.9 | 5.8 | 5.6 | 5.8 | 0.3 | 6.5 | 6.9 | 5.8 | 6.1 | 6.2 | 6.6 | 6.3 | 0.4 | -2.547 |
Phe (F) | 4.4 | 4.3 | 3.7 | 4.4 | 4.3 | 3.4 | 4.1 | 0.4 | 4.4 | 5.4 | 3.9 | 4.0 | 4.1 | 4.3 | 4.4 | 0.6 | -1.006 |
Gly (G) | 6.4 | 7.5 | 6.6 | 6.5 | 6.8 | 8.4 | 7.1 | 0.8 | 6.7 | 5.8 | 7.4 | 7.3 | 6.7 | 6.3 | 6.7 | 0.6 | 0.922 |
His (H) | 2.2 | 2.0 | 2.3 | 2.1 | 2.3 | 1.9 | 2.1 | 0.2 | 2.1 | 2.1 | 2.3 | 1.9 | 2.4 | 1.8 | 2.1 | 0.2 | 0.206 |
Ile (I) | 7.2 | 7.1 | 6.9 | 7.4 | 6.2 | 5.0 | 6.6 | 0.9 | 7.1 | 7.2 | 6.0 | 6.3 | 6.0 | 7.9 | 6.8 | 0.8 | -0.298 |
Lys (K) | 6.1 | 5.7 | 5.2 | 6.1 | 5.1 | 3.3 | 5.2 | 1.0 | 6.3 | 8.9 | 4.4 | 4.3 | 4.9 | 8.1 | 6.2 | 2.0 | -1.019 |
Leu (L) | 10.3 | 10.4 | 10.1 | 10.7 | 10.1 | 10.4 | 10.3 | 0.2 | 10.5 | 11.2 | 10.7 | 11.4 | 10.8 | 9.6 | 10.7 | 0.6 | -1.370 |
Met (M) | 2.4 | 2.6 | 2.8 | 2.4 | 2.5 | 2.0 | 2.5 | 0.3 | 2.4 | 2.3 | 2.8 | 2.0 | 2.7 | 2.6 | 2.5 | 0.3 | -0.137 |
Asn (N) | 5.1 | 3.8 | 4.6 | 4.8 | 4.5 | 2.9 | 4.3 | 0.8 | 4.9 | 5.9 | 3.9 | 4.1 | 3.9 | 5.6 | 4.7 | 0.9 | -0.883 |
Pro (P) | 3.5 | 3.9 | 4.0 | 3.6 | 3.9 | 5.0 | 4.0 | 0.5 | 3.7 | 3.3 | 4.4 | 5.1 | 4.0 | 3.2 | 4.0 | 0.7 | 0.140 |
Gln (Q) | 4.5 | 3.7 | 4.7 | 4.4 | 4.8 | 3.7 | 4.3 | 0.5 | 4.6 | 3.7 | 4.4 | 5.5 | 5.2 | 3.6 | 4.5 | 0.8 | -0.602 |
Arg (R) | 3.8 | 5.0 | 4.4 | 4.0 | 4.4 | 6.1 | 4.6 | 0.9 | 4.5 | 3.5 | 5.5 | 5.1 | 5.0 | 3.8 | 4.6 | 0.8 | 0.115 |
Ser (S) | 7.2 | 6.6 | 6.6 | 6.7 | 6.9 | 6.8 | 6.8 | 0.2 | 5.8 | 6.8 | 5.8 | 5.9 | 6.3 | 6.1 | 6.1 | 0.4 | 3.684 |
Thr (T) | 5.6 | 5.3 | 5.8 | 5.4 | 5.5 | 5.6 | 5.5 | 0.2 | 5.2 | 4.4 | 5.4 | 5.5 | 5.2 | 5.5 | 5.2 | 0.4 | 1.779 |
Val (V) | 6.6 | 6.7 | 6.6 | 6.4 | 6.9 | 8.0 | 6.9 | 0.6 | 6.7 | 5.6 | 7.1 | 6.6 | 7.0 | 6.9 | 6.6 | 0.5 | 0.724 |
Trp (W) | 1.1 | 1.0 | 1.2 | 1.1 | 1.2 | 1.5 | 1.2 | 0.2 | 1.1 | 0.7 | 1.5 | 1.6 | 1.3 | 1.0 | 1.2 | 0.3 | -0.023 |
Tyr (Y) | 3.1 | 3.0 | 3.1 | 3.1 | 3.1 | 2.1 | 2.9 | 0.4 | 3.1 | 3.7 | 2.8 | 2.9 | 3.0 | 4.0 | 3.3 | 0.5 | -1.310 |
Amino Acid Property Groups | |||||||||||||||||
Tiny | 28.3 | 29.4 | 29.1 | 28.1 | 29.0 | 33.8 | 29.6 | 2.1 | 27.0 | 24.9 | 29.2 | 28.0 | 28.4 | 25.1 | 27.1 | 1.8 | 2.235 |
Small | 49.1 | 48.8 | 50.3 | 48.4 | 50.2 | 55.1 | 50.3 | 2.4 | 47.3 | 44.4 | 49.8 | 48.9 | 48.4 | 46.6 | 47.6 | 1.9 | 2.166 |
aliphatic | 24.1 | 24.2 | 23.5 | 24.5 | 23.2 | 23.4 | 23.8 | 0.5 | 24.3 | 24.0 | 23.8 | 24.3 | 23.9 | 24.4 | 24.1 | 0.3 | -1.157 |
aromatic | 10.8 | 10.3 | 10.2 | 10.7 | 10.9 | 8.9 | 10.3 | 0.8 | 10.7 | 11.9 | 10.5 | 10.4 | 10.8 | 11.1 | 10.9 | 0.6 | -1.559 |
non polar | 54.2 | 56.5 | 55.0 | 55.2 | 55.0 | 58.9 | 55.8 | 1.7 | 55.1 | 53.1 | 57.3 | 56.6 | 55.9 | 52.9 | 55.1 | 1.8 | 0.615 |
Polar | 45.8 | 43.5 | 45.0 | 44.8 | 45.0 | 41.1 | 44.2 | 1.7 | 44.9 | 46.9 | 42.7 | 43.4 | 44.1 | 47.1 | 44.8 | 1.8 | -0.601 |
charged | 23.4 | 24.1 | 23.3 | 23.4 | 23.4 | 22.2 | 23.3 | 0.6 | 24.3 | 26.1 | 23.1 | 22.4 | 23.5 | 26.2 | 24.3 | 1.6 | -1.414 |
Basic | 12.0 | 12.7 | 11.8 | 12.2 | 11.8 | 11.3 | 12.0 | 0.5 | 12.8 | 14.5 | 12.2 | 11.3 | 12.3 | 13.7 | 12.8 | 1.2 | -1.663 |
Acidic | 11.5 | 11.4 | 11.5 | 11.2 | 11.6 | 10.9 | 11.3 | 0.3 | 11.5 | 11.6 | 10.9 | 11.1 | 11.2 | 12.5 | 11.5 | 0.5 | -0.541 |
Neutral | 25.9 | 25.2 | 26.0 | 25.2 | 26.3 | 26.4 | 25.8 | 0.5 | 24.4 | 22.8 | 25.3 | 26.1 | 25.8 | 23.3 | 24.6 | 1.3 | 2.057 |
hydrophilic | 30.8 | 29.6 | 30.3 | 30.6 | 30.4 | 26.9 | 29.8 | 1.5 | 31.8 | 33.6 | 29.2 | 30.2 | 30.2 | 33.7 | 31.4 | 1.9 | -1.696 |
hydrophobic | 44.3 | 45.0 | 44.4 | 45.1 | 44.2 | 45.4 | 44.7 | 0.5 | 44.7 | 44.0 | 45.5 | 44.2 | 45.2 | 43.5 | 44.5 | 0.8 | 0.527 |