Numbers between parentheses indicate the class number, for a given property. Hydrogen donor or acceptor atom (4 classes) IMGT classes of the amino acids side chain properties Table 2: IMGT classes of the 20 common amino acids side chain properties. (A, C, G, I, L, M, F, P, W, V) amino acids. Regarding the 'Charge', the 'nonpolar' class includes the other 10 uncharged The 'nonpolar' class comprises amino acids without hydrogen donor or acceptor atoms ('none'), and also Includes the 5 charged (R, H, K, D, E) and 5 uncharged (N, Q, S, T, Y) amino acids. Indeed, tryptophan, despite its hydrogen donor atom, has been classified in the IMGT 'nonpolar' class,Īs it participates to the nonpolar core of the structural domains.Regarding the 'Charge', the 'polar' class The 'polar' class comprises amino acids with hydrogen donor and/or acceptor atoms, except tryptophan.
Nonpolar: A, C, G, I, L, M, F, P, W, V. The final amino acid assignment to one of the four bead types is optimized by minimizing the summed energy over all TM.There are 4 IMGT 'Hydrogen donor or acceptor atoms' classes.īased on the presence or absence of hydrogen donor and/or acceptor atoms. The sulfhydryl group of cystein and phenolic hydroxyl group of tyrosine show some degree of pH-dependent ionization. Uncharged: A, N, C, Q, G, I, L, M, F, P, S, T, W, Y, V.There are 5 IMGT 'Volume' classes (volume in Å 3).Īmino acids in each class are in the order of Table 2:Īmino acids are ordered from the smallest one (G) to the largest one (W). Has been classified in the IMGT 'hydrophobic' class, as it participates to the hydrophobic core of the structural domains. (1) Tryptophan, despite its value of -0.9 in the Kyte-Doolittle scale, To the most hydrophilic one, Arginine (R, on the right hand side), according to the Kyte-Doolitle scale. They have been individualized from 'Chemical' (G and P from 'aliphatic', F, W and Y from 'aromatic') classes, based on the structural properties of the amino acids in protein domains.Īmino acids in each class are in the order of Table 2 :Īmino acids are ordered from the most hydrophobic one, Isoleucine (I, on the left hand side) 'Chemical', 'Charge', 'Hydrogen donor or acceptor atoms'Īnd 'Polarity' properties of the side chains (or R- groups). The 11 IMGT 'Physicochemical' classes were defined on the 'Hydrophathy', 'Volume', Figure 1: The 11 IMGT 'Physicochemical' classes of the 20 common amino acids.
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