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The molten globule is a compact protein conformation that has a secondary structure content like that of the native protein, but poorly defined tertiary structure. It is a stable state for a few proteins under particular conditions and could be a ubiquitous kinetic intermediate in protein folding. The extent to which native interactions, above the level of the secondary structure, are preserved in this conformation is not so far known. Here we report that alpha-lactalbumin can adopt a molten globule conformation when one of its four disulphide bonds is reduced. In this state, the three other disulphide bonds rearrange spontaneously, at the same rate as when the protein is fully unfolded, to a number of different disulphide bond isomers that tend to maintain the molten globule conformation. That the molten globule state is compatible with a variety of disulphide bond pairings suggests that it is unlikely to be stabilized by many specific tertiary interactions. 相似文献
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Su X Chakravarti D Cho MS Liu L Gi YJ Lin YL Leung ML El-Naggar A Creighton CJ Suraokar MB Wistuba I Flores ER 《Nature》2010,467(7318):986-990
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Spontaneous re-formation of a broken peptide chain 总被引:5,自引:0,他引:5
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Antitumour activity in a series of bisdiketopiperazines 总被引:2,自引:0,他引:2