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Table 5 Protein lengths and amino acid frequencies (one letter code) for nine in the nine databases, length – average protein length in database, reference – database reference; f i – amino acid frequencies

From: Analytical model of peptide mass cluster centres with applications

Organ izm length f F f S f T f N f K f Y f E f V f Q f M
Arabidopsis t. 422.40 4.27 9.01 5.11 4.41 6.36 2.86 6.74 6.69 3.52 2.44
Drosophila m. 506.20 3.48 8.33 5.68 4.80 5.70 2.91 6.41 5.88 5.21 2.33
Escherichia coli 300.30 3.86 6.25 5.67 4.26 4.59 2.96 5.65 6.91 4.40 2.67
Homo sapiens 360.40 3.61 8.61 5.55 3.55 5.54 2.86 6.81 6.02 4.80 2.12
Mus musculus 378.30 3.74 8.58 5.55 3.59 5.71 2.88 6.75 6.11 4.74 2.22
Rattus norvegicus 484.40 3.81 8.33 5.52 3.59 5.62 2.74 6.77 6.32 4.64 2.28
Saccharomyces c. 447.00 4.47 9.02 5.93 6.18 7.26 3.41 6.43 5.58 3.94 2.10
Rhodopirellula b. 314.70 3.70 7.37 5.85 3.37 3.44 2.09 6.02 7.05 4.04 2.43
SwissProt DB 367.90 4.03 6.89 5.47 4.22 5.93 3.09 6.59 6.70 3.93 2.38
Mean 397.96 3.89 8.04 5.59 4.22 5.57 2.87 6.46 6.36 4.36 2.33
SD 71.90 0.32 0.98 0.24 0.88 1.07 0.35 0.39 0.50 0.54 0.18
Min 300.30 3.48 6.25 5.11 3.37 3.44 2.09 5.65 5.58 3.52 2.10
Max 506.20 4.47 9.02 5.93 6.18 7.26 3.41 6.81 7.05 5.21 2.67
  reference f C f L f A f W f P f H f D f R f I f G
Arabidopsis t. [34] 1.80 9.52 6.36 1.26 4.80 2.28 5.43 5.39 5.34 6.41
Drosophila m. [34] 1.95 9.02 7.36 1.00 5.46 2.64 5.18 5.53 4.96 6.17
Escherichia coli [34] 1.17 10.23 9.27 1.50 4.32 2.22 5.21 5.54 5.94 7.38
Homo sapiens [34] 2.24 9.78 6.98 1.35 6.22 2.51 4.73 5.64 4.28 6.80
Mus musculus [34] 2.29 9.92 6.86 1.29 6.03 2.57 4.76 5.51 4.38 6.54
Rattus norvegicus [34] 2.29 10.07 6.88 1.25 5.97 2.58 4.77 5.59 4.51 6.49
Saccharomyces c. [34] 1.30 9.52 5.51 1.04 4.39 2.18 5.76 4.41 6.58 5.00
Rhodopirellula b. [37] 1.27 9.31 9.25 1.54 5.33 2.31 6.23 6.96 4.95 7.48
SwissProt [27] 1.57 9.63 7.80 1.17 4.86 2.27 5.30 5.29 5.92 6.94
Mean   1.76 9.67 7.36 1.27 5.26 2.40 5.26 5.54 5.21 6.58
SD   0.45 0.38 1.25 0.18 0.71 0.18 0.50 0.65 0.80 0.74
Min   1.17 9.02 5.51 1.00 4.32 2.18 4.73 4.41 4.28 5.00
Max   2.29 10.23 9.27 1.54 6.22 2.64 6.23 6.96 6.58 7.48