Abstract
Main points given in the above reports can be summarized as follows. Multiple unfolded forms exist for lysozyme as well as for RNase. The existence of fast- and slow-folding forms appears to be a general phenomenon; it has been confirmed for a number of globular proteins, which contain proline residues. The major slow refolding reaction of RNase A is a sequential process via structural intermediates. A rapidly formed intermediate has also been detected on the direct UF----N refolding pathway of lysozyme. The activated state for folding of lysozyme shows a conformation similar to the native protein in terms of packing of hydrophobic groups. This suggests that, in terms of compactness, the rate-limiting step occurs at a late stage of the refolding process. A protein homologous to lysozyme, alpha-lactalbumin, shows similar kinetics although alpha-lactalbumin shows an apparent equilibrium unfolding intermediate. The location of the rate-limiting step close to the native state has also been suggested for other proteins. It still remains open whether this is a general property of protein folding reactions. As shown for the unfolding of Mb, the multi-probe kinetic measurements will be a powerful tool for investigating the mechanism of...Continue Reading
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