Table 1. Intrinsic backbone PP _II propensities measured in disordered peptides.

	Kallenbach [17]	Creamer [18]	Hilser [19]
host a	Ac-G2XG2-NH2	Ac-P3XP3GY-NH2	Ac-VP2XVP2R3Y-NH2
ALA (A)	0.818	0.61	0.37
CYS (C)	0.557	0.55	0.25
ASP (D)	0.552	0.63	0.30
GLU (E)	0.684	0.61	0.42
PHE (F)	0.639	0.58	0.17
GLY (G)	-	0.58	0.13
HIS (H)	0.428	0.55	0.20
ILE (I)	0.519	0.50	0.39
LYS (K)	0.581	0.59	0.56
LEU (L)	0.574	0.58	0.24
MET (M)	0.498	0.55	0.36
ASN (N)	0.667	0.55	0.27
PRO (P)	-	0.67	1.00
GLN (Q)	0.654	0.66	0.53
ARG (R)	0.638	0.61	0.38
SER (S)	0.774	0.58	0.24
THR (T)	0.553	0.53	0.32
VAL (V)	0.743	0.49	0.39
TRP (W)	0.764	-	0.25
TYR (Y)	0.630	-	0.25
average	0.626	0.58	0.35

^asequence of host peptide used to measure PP _II propensity at the guest position, X