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Table 6 Frequency of occurrence of the protein segments defined by our alphabet in four main SCOP classes

From: Protein structure search and local structure characterization

  All alpha All beta alpha/beta alpha+beta
Letter Count Percentage Count Percentage Count Percentage Count Percentage
A 54859 2.95 255473 8.83 278238 5.46 161041 6.07
R 91363 4.92 148361 5.13 270345 5.31 145619 5.49
N 76176 4.10 309834 10.71 340682 6.69 202555 7.64
D 21055 1.13 127159 4.39 112078 2.20 66959 2.53
C 34856 1.88 172334 5.96 193952 3.81 102632 3.87
Q 102444 5.51 111333 3.85 271893 5.34 138081 5.21
E 58672 3.16 782607 27.06 620717 12.18 427778 16.14
G 42350 2.28 72105 2.49 147390 2.89 76968 2.90
H 39017 2.10 115542 3.99 163319 3.21 89203 3.37
I 3547 0.19 6607 0.23 9449 0.19 5739 0.22
L 49312 2.65 40909 1.41 141605 2.78 65856 2.48
K 43582 2.35 58687 2.04 146869 2.88 70549 2.66
M 16727 0.90 127070 4.39 110318 2.17 67912 2.56
F 70718 3.81 89366 3.09 179145 3.52 91702 3.46
P 104364 5.62 54939 1.91 192654 3.78 87149 3.29
S 76080 4.10 83725 2.89 173935 3.41 91160 3.44
T 937938 50.49 149259 5.17 1551585 30.46 651525 24.58
W 34533 1.86 186476 6.46 190001 3.72 108460 4.09
Total 1857593 100.00 2891786 100.00 5094175 100.00 2650888 100.00