Abstract
For the purpose of equilibrium and kinetic folding-unfolding studies, the SH3 domain of α-spectrin (spc-SH3) has long been considered a classic two-state folding protein. In this work we have indeed observed that the thermal unfolding curves of spc-SH3 measured at pH 3.0 by differential scanning calorimetry, circular dichroism, and NMR
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