Assessing the Ability of Spectroscopic Methods to Determine the Difference in the Folding Propensities of Highly Similar β-Hairpins.

We have evaluated the ability of nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopies to describe the difference in the folding propensities of two structurally highly similar cyclic β-hairpins, comparing the outcome to that of molecular dynamics simulations. NAMFIS-type NMR ensemble analysis and CD spectroscopy were observed to accurately describe the consequence of altering a single interaction site, whereas a single-site ¹³ C NMR chemical shift melting curve-based technique was not.