Table 1 The mean frequencies of the individual amino acids (p(a)) in the genomes of living organisms
From: Optimality of the genetic code with respect to protein stability and amino-acid frequencies
Amino acid | p(a) Archaea (%) | p(a) Bacteria (%) | p(a) Eukaryotes (%) | p(a) (%) |
|---|---|---|---|---|
Ala | 7.85 (2.27) | 8.08 (2.61) | 6.48 (0.76) | 7.80 (2.38) |
Arg | 5.92 (1.15) | 4.99 (1.61) | 5.24 (0.49) | 5.23 (1.43) |
Asp | 5.47 (1.57) | 5.06 (0.42) | 5.31 (0.35) | 5.19 (0.81) |
Asn | 3.40 (1.05) | 4.63 (1.97) | 4.76 (0.90) | 4.37 (1.73) |
Cys | 0.89 (0.32) | 1.00 (0.31) | 1.86 (0.35) | 1.10 (0.44) |
Glu | 7.79 (1.13) | 6.35 (1.21) | 6.64 (0.28) | 6.72 (1.24) |
Gln | 1.90 (0.40) | 3.89 (0.95) | 4.28 (0.69) | 3.45 (1.19) |
Gly | 7.49 (0.75) | 6.70 (1.46) | 5.88 (0.72) | 6.77 (1.32) |
His | 1.70 (0.29) | 2.07 (0.39) | 2.41 (0.21) | 2.03 (0.41) |
Ile | 7.59 (2.19) | 7.05 (2.26) | 5.48 (0.92) | 6.95 (2.16) |
Leu | 9.65 (1.00) | 10.52 (0.66) | 9.35 (0.42) | 10.15 (0.86) |
Lys | 6.04 (2.75) | 6.43 (2.78) | 6.30 (0.69) | 6.32 (2.53) |
Met | 2.49 (0.47) | 2.19 (0.37) | 2.33 (0.21) | 2.28 (0.39) |
Phe | 4.00 (0.74) | 4.57 (0.97) | 4.20 (0.59) | 4.39 (0.89) |
Pro | 4.43 (0.92) | 3.99 (1.00) | 5.15 (0.75) | 4.26 (1.01) |
Ser | 5.93 (1.11) | 6.18 (0.77) | 8.50 (0.47) | 6.46 (1.17) |
Thr | 4.77 (0.89) | 5.15 (0.63) | 5.57 (0.32) | 5.12 (0.69) |
Trp | 1.03 (0.20) | 1.10 (0.28) | 1.13 (0.12) | 1.09 (0.25) |
Tyr | 3.68 (0.66) | 3.23 (0.64) | 3.03 (0.26) | 3.30 (0.63) |
Val | 7.97 (0.85) | 6.87 (1.19) | 6.09 (0.42) | 7.01 (1.18) |