Descriptors of DPPS for 20 coded amino acids.
AA	Abbr.	V1 a	V2	V3	V4	V5	V6	V7	V8	V9	V10
Ala	A	-1.02	-2.88	-0.56	0.36	-6.15	-1.68	0.04	-2.51	-1.94	-0.01
Arg	R	1.99	4.13	-4.41	-1.02	4.78	3.04	-9.06	6.71	4.41	0.07
Asn	N	-2.19	1.86	0.38	-0.13	-2.30	1.41	-5.71	-1.11	1.73	-0.19
Asp	D	-6.60	3.32	1.61	0.36	-3.25	1.95	-7.36	0.14	1.24	-0.15
Cys	C	0.21	1.12	3.42	-0.68	-2.27	-1.22	3.11	-2.98	-1.70	1.57
Gln	Q	-0.47	1.16	-0.57	0.69	0.39	1.93	-5.46	-0.84	1.93	0.85
Glu	E	-5.39	0.65	-0.98	1.39	-0.23	2.51	-6.84	-0.68	1.41	1.28
Gly	G	-2.86	-5.00	-2.97	0.53	-11.45	1.89	-2.11	-3.99	-2.16	-0.76
His	H	0.73	2.68	-0.66	-1.89	1.60	1.13	-1.94	-0.11	0.44	0.15
Ile	I	1.91	-3.13	0.01	1.14	2.70	-4.55	8.93	0.18	-1.10	-0.76
Leu	L	1.64	-2.57	0.00	1.35	2.62	-2.65	7.72	0.05	-1.03	-1.81
Lys	K	2.47	1.54	-4.28	-0.86	2.77	2.06	-6.18	2.05	2.19	-1.65
Met	M	1.93	-0.01	1.21	0.99	2.79	-0.56	5.33	-0.87	-0.99	-1.09
Phe	F	2.68	0.84	2.22	0.71	5.02	-0.30	8.60	1.13	-1.40	-0.28
Pro	P	0.45	-2.89	1.77	-5.81	-3.79	-0.61	0.70	1.21	-1.67	1.79
Ser	S	-1.76	-0.19	1.06	-0.69	-5.72	0.14	-4.14	-2.42	-0.13	0.69
Thr	T	-0.55	-0.66	0.13	-0.31	-2.76	-1.56	-2.46	-2.12	0.17	0.08
Trp	W	3.88	1.78	1.68	2.00	9.31	0.89	7.53	4.27	-0.23	-1.42
Tyr	Y	2.10	1.26	1.15	0.91	5.90	0.74	3.71	3.32	0.25	1.33
Val	V	0.83	-3.02	-0.22	0.97	0.05	-4.55	5.61	-1.41	-1.44	0.30
a The DPPS descriptors for 20 amino acids are derived by PCA. The electronic properties of the amino acid are characterized by V1-V4, steric properties by V5 and V6, hydrophobic properties by V7 and V8, and hydrogen bond contributions by V9 and V10.
References [1] F. Tian, L. Yang, F. Lv, Q. Yang, P. Zhou, In silico quantitative prediction of peptides binding affinity to human MHC molecule: an intuitive quantitative structure-activity relationship approach, Amino Acids, 36 (2009) 535-554.