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Table 1 Seven amino acid classes used in our model.

From: Interaction prediction and classification of PDZ domains

Class Amino acid(s) Volume (Å3) Dipole (Debye)
1 Ala, Gly, Val <50 0
2 Ile, Leu, Phe, Pro >50 0
3 Tyr, Met, Thr, Ser >50 <1.0
4 His, Asn, Gln, Trp >50 1.0 < Dip. < 2.0
5 Arg, Lys >50 2.0 < Dip. < 3.0
6 Asp, Glu >50 >3.0
7 Cys* >50 <1.0
  1. *Cys is differentiated from class 3 because it can form disulfide bonds