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Unfolded ribonuclease A consists of a mixture of fast- and slow-refolding species. It is generally accepted that the slow-refolding states arise from isomerization of proline residues. We show that unfolding at subzero temperatures may be used to trap the fast-refolding species Uf, since the rate of proline isomerization slows down at a much faster rate than protein unfolding. The unfolding was carried out in 5 M guanidine hydrochloride; at -15 degrees C the protein unfolding process is complete within 30 s and under these conditions there is less than 1.5% proline isomerization. By using ribonuclease in which Tyr-115 was nitrated it was possible to rule out significant isomerization of Pro-114 in the observed slow-unfolding step.
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