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Table 2 Distribution of amino acids and property group parameters in the predicted secondary structural elements of psychrophilic and mesophilic proteomes.

From: Comparative proteome analysis of psychrophilic versus mesophilic bacterial species: Insights into the molecular basis of cold adaptation of proteins

  α-Helix β-Sheet Coil
Amino Acids Psychro Meso   Psychro Meso   Psychro Meso  
  Avg SD Avg SD t-val Avg SD Avg SD t-val Avg SD Avg SD t-val
Ala (A) 5.23 0.95 4.79 0.09 0.906 1.15 0.07 1.05 0.12 1.745 2.83 0.61 2.27 0.56 1.963
Cys (C) 0.41 0.11 0.42 0.00 -0.097 0.22 0.05 0.23 0.04 -0.026 0.37 0.08 0.35 0.02 0.524
Asp (D) 1.90 0.13 1.88 0.00 0.176 0.52 0.09 0.50 0.02 0.466 3.09 0.23 2.75 0.34 2.660
Glu (E) 3.04 0.22 3.42 0.02 -2.480 0.70 0.09 0.74 0.04 -1.086 2.09 0.10 2.18 -0.08 -1.487
Phe (F) 2.03 0.24 2.24 0.01 -1.378 0.97 0.17 1.02 0.15 -0.526 1.07 0.07 1.10 -0.03 -0.544
Gly (G) 1.81 0.19 1.87 0.01 -0.593 0.66 0.08 0.68 0.05 -0.494 4.58 0.71 4.11 0.47 1.392
His (H) 0.83 0.08 0.83 0.00 0.047 0.36 0.04 0.35 0.03 0.366 0.92 0.07 0.91 0.01 0.295
Ile (I) 3.26 0.49 3.45 0.03 -0.722 1.97 0.29 1.99 0.20 -0.134 1.38 0.16 1.32 0.06 0.734
Lys (K) 2.48 0.54 3.00 0.17 -1.123 0.65 0.16 0.77 0.21 -1.043 2.11 0.36 2.41 -0.30 -0.876
Leu (L) 6.03 0.23 6.42 0.01 -2.619 2.01 0.14 2.04 0.19 -0.294 2.29 0.13 2.24 0.06 0.612
Met (M) 1.22 0.16 1.26 0.01 -0.363 0.38 0.05 0.38 0.05 -0.245 0.86 0.05 0.84 0.02 0.633
Asn (N) 1.36 0.27 1.59 0.02 -1.383 0.41 0.12 0.45 0.07 -0.725 2.51 0.46 2.67 -0.16 -0.572
Pro (P) 0.98 0.07 1.01 0.01 -0.409 0.26 0.03 0.28 0.04 -0.950 2.76 0.51 2.65 0.11 0.353
Gln (Q) 2.27 0.21 2.45 0.03 -0.956 0.53 0.10 0.54 0.08 -0.359 1.51 0.18 1.53 -0.02 -0.166
Arg (R) 2.31 0.44 2.32 0.03 -0.041 0.70 0.06 0.71 0.12 -0.175 1.61 0.37 1.53 0.07 0.383
Ser (S) 2.65 0.17 2.55 0.01 0.798 0.90 0.14 0.81 0.10 1.190 3.26 0.22 2.76 0.50 4.981
Thr (T) 2.07 0.11 2.06 0.01 0.133 1.15 0.09 1.07 0.10 1.335 2.32 0.20 2.06 0.25 2.418
Val (V) 2.98 0.25 2.97 0.01 0.038 2.34 0.20 2.28 0.15 0.598 1.56 0.19 1.38 0.18 1.912
Trp (W) 0.62 0.09 0.66 0.01 -0.431 0.25 0.04 0.24 0.07 0.186 0.32 0.06 0.30 0.02 0.598
Tyr (Y) 1.32 0.19 1.51 0.01 -1.554 0.75 0.15 0.83 0.11 -1.066 0.86 0.09 0.92 -0.06 -0.979
All AA 44.81 1.56 46.73 0.18 -2.507 16.88 1.58 16.98 0.34 -0.153 38.31 1.90 36.29 2.02 2.379
Amino Acid Property Groups
Tiny 12.18 0.90 11.70 0.14 0.913 4.08 0.36 3.84 0.24 1.336 13.37 1.54 11.56 0.11 2.537
Small 19.39 0.95 19.16 0.18 0.415 7.62 0.58 7.37 0.31 0.946 23.29 2.03 21.02 0.18 2.435
Aliphatic 12.27 0.56 12.85 0.01 -2.279 6.33 0.31 6.32 0.15 0.090 5.23 0.22 4.94 0.01 2.443
Non-polar 25.90 1.07 26.62 0.14 -1.241 10.97 0.80 11.03 0.28 -0.171 18.89 1.80 17.49 0.24 1.594
Aromatic 4.81 0.39 5.24 0.01 -2.235 2.32 0.36 2.44 0.17 -0.719 3.18 0.17 3.24 0.00 -0.651
Polar 18.91 0.95 20.11 0.21 -1.987 5.91 0.78 5.95 0.14 -0.129 19.42 0.83 18.80 0.09 1.340
Charged 10.56 0.57 11.46 0.17 -1.923 2.93 0.35 3.06 0.14 -0.895 9.82 0.16 9.78 0.05 0.192
Basic 5.61 0.36 6.15 0.06 -1.863 1.71 0.17 1.82 0.11 -1.353 4.64 0.07 4.85 0.04 -1.041
Acidic 4.94 0.22 5.31 0.03 -1.892 1.22 0.18 1.24 0.03 -0.335 5.19 0.21 4.93 0.01 2.287
Neutral 9.64 0.36 9.77 0.05 -0.469 3.59 0.43 3.46 0.16 0.674 12.59 0.98 11.38 0.09 2.430
H-philic 13.36 0.69 14.67 0.18 -2.552 3.51 0.52 3.72 0.13 -0.940 12.91 0.67 13.06 0.11 -0.356
H-phobic 23.11 0.85 23.73 0.09 -1.352 10.04 0.71 10.06 0.22 -0.067 11.56 0.66 10.72 0.02 2.715
  1. Significant compositional differences as indicated by t-test parameter are shown in bold.