22.2组成蛋白质的20种氨基酸 5-1 Properties and Conventions Associated with the Standard Amino Acids Abbreviated Amino acid (R group) Hydropathy in proteins (%) R groups Glycine 2.34 5.97 0.4 7.2 Alanin 2.34 5.97 Leuc ine 131 2.36 9.60 5.98 3.8 9.1 Isoleucine 131 968 6.02 4.5 5.3 Methionine 149 2.28 921 5.74 1.9 2,3 Aromatic R groups 165 1.83 9,13 548 3,9 181 2.20 9.11 10.07 5.66 Tryptophan 2.38 9.39 5.89 1.4 Polar, uncharged R groups Serine 2.21 -0.8 Proline 115 1.99 10.96 648 Threonine PTcAG 119 2.11 9.62 587 0.7 5.9 121 8.18 132 2.02 5.41 2.17 9,13 5.65 4,2 Positively charged R groups 146 8.95 10.53 9.74 39 Histidine 155 9.17 6.00 Arginine 174 2.17 904 12.48 10 Negatively charged Aspartate 133 9.60 3.65 3.5 5.3 Glutamate 147 2.19 9.67 4.25 3.22 3.5 6.3 'A scale combining hydrophobicity and hydrophilicity of R groups; it can be used to me tendency of an amino acid to seek ues) or a nyaropno te,J& bio.157.105-132 'Average occurrence in over 1150 proteins From Doolittle, R F(1989)Redundancies in protein Structure and the Principles of Profein Conformation(Fasman, G D, ed) Plenum Press, NY, pp. 599-623 n sequences In Prediction of protein2.2.2 组成蛋白质的20种氨基酸