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.