Table 1. Reaction Rates and Implied Equilibrium Constants for the Folding Reaction (Eq 2)^a.

peptide	proline conc.	kunfold [1/μs]	kfold [1/μs]	K
Ala5	5 M	30.0 ± 7.8	1.77 ± 0.01	0.0590 ± 0.0157
Ala8		3.82 ± 1.78	0.639 ± 0.132	0.168 ± 0.113
Ala15		0.623 ± 0.352	2.40 ± 1.11	3.86 ± 3.96
AAQAA3		0.910 ± 0.530	0.836 ± 0.476	0.92 ± 1.06
KR1		0.497 ± 0.200	0.141 ± 0.025	0.284 ± 0.164
Ala5	2 M	330 ± 4	11.3 ± 1.2	0.0343 ± 0.0041
Ala8		9.76 ± 3.27	1.08 ± 0.34	0.111 ± 0.072
Ala15		0.702 ± 0.063	0.637 ± 0.240	0.908 ± 0.423
AAQAA3		3.65 ± 0.09	1.19 ± 0.01	0.326 ± 0.011
KR1		4.00 ± 1.04	0.513 ± 0.033	0.128 ± 0.042
Ala5	0 M	443 ± 8	13.1 ± 1.0	0.0297 ± 0.0028
Ala8		74.5 ± 10.2	5.00 ± 0.39	0.0671 ± 0.0144
Ala15		11.7 ± 5.1	4.15 ± 2.31	0.356 ± 0.352
AAQAA3		6.85 ± 0.31	1.89 ± 0.12	0.276 ± 0.030
KR1		22.6 ± 4.9	1.31 ± 0.14	0.0581 ± 0.0188
Ala21		1.16 ± 0.18	1.66 ± 0.27	1.43 ± 0.45

^aThe errors of k_fold and k_unfold come from maximum differences between “e” and “h” trajectories under each conditions. The error of K has been obtained as the maximum error via a complete differential rule. Three significant digits and/or same accuracy for errors associated to each value.