Glu

1.59

0.52

1.01

Ala

1.41

0.72

0.82

Leu

1.34

1.22

0.57

Met

1.30

1.14

0.52

Gln

1.27

0.98

0.84

Lys

1.23

0.69

1.07

Arg

1.21

0.84

0.90

His

1.05

0.80

0.81

Val

0.90

1.87

0.41

Ile

1.09

1.67

0.47

Tyr

0.74

1.45

0.76

Cys

0.66

1.40

0.54

Trp

1.02

1.35

0.65

Phe

1.16

1.33

0.59

Thr

0.76

1.17

0.96

Gly

0.43

0.58

1.77

Asn

0.76

0.48

1.34

Pro

0.34

0.31

1.32

Ser

0.57

0.96

1.22

Asp

0.99

0.39

1.24

Note: The amino acids are grouped according to their preference for α helices (top group), β sheets (middle group), or turns (bottom group).

Source: T. E. Creighton, Proteins: Structures and Molecular Properties, 2d ed. (W. H. Freeman and Company, 1992), p. 256.