ProFold: Protein Fold Classification with Additional Structural Features and a Novel Ensemble Classifier

Table 3

The 20 amino acids divided into 3 groups according to their physiochemical properties.

Physicochemical property	The 1st group	The 2nd group	The 3rd group
Hydrophobicity	RKEDQN	GASTPHY	CVLIMFW
Van der Waals volume	GASCTPD	NVEQIL	MHKFRYW
Polarity	LIFWCMVF	PATGS	HQRKNED
Polarizability	GASDT	CPNVEQIL	KMHFRYW
Charge	KR	ANCQGHILMFPSTWYV	DE
Surface tension	GQDNAHR	KTSEC	ILMFPWYV
Secondary structure	EALMQKRH	VIYCWFT	GNPSD
Solvent accessibility	ALFCGIVW	RKQEND	MPSTHY