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Table 1 Preferred and avoided amino acids from proteomes of 10 hyperthermophiles (HT) and thermophiles (T), and 18 mesophiles (M)

From: Preferred codons and amino acid couples in hyperthermophiles

    HT and T M  
    Prokarya Prokarya Eukarya  
Amino acids Secondary structures Polar requirement* Average (range) Average (range)   Ratio (HT, T)/M
Gln (Q) α-helix 8.60 1.88 (1.44-2.08) 4.19(3.25-5.5) 4.28 (3.97-5.24) 0.44
His (H) α-helix 8.40 1.53 (1.43-1.9) 2.29 (1.83-2.74) 2.4(2.15-2.68) 0.65
Ala (A) α-helix 7.00 6.38 (5.44-7.84) 9.83 (6-13) 7.64(6.19-11.1) 0.73
Cys (C) β-strand 4.8 0.81 (0.56-1.27) 1.09 (0.67-1.91) 1.84(1.27-2.21) 0.62
Glu (E) α-helix 12.50 8.11 (5.53-9.6) 5.8(4.4-7.08) 6.6 (6.39-6.99) 1.34
Lys (K) α-helix 10.10 7.5 (4.5-10.4) 4.56 (2.61-10) 6.28 (5.6-7.29) 1.49
Tyr (Y) β-strand 5.40 4.08 (3.2-4.82) 2.74 (1.9-3.48) 3.01 (2.76-3.35) 1.45
Ile (I) β-strand 4.90 8.42 (7.18-10.5) 5.5(3.28-8.64) 5.46 (4.43-6.51) 1.52
  1. *Taken from 14; Taken from 16; data on HT. T. M in %; only ratios >1.3 and <0.8 are shown.