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Chaperonins and protein folding: unity and disunity of mechanisms

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Summary

Chaperonin-facilitated folding of proteins involves two partial reactions. The first partial reaction, the formation of stable binary complexes between chaperonin-60 and non-native states of the target protein, is common to the chaperonin-facilitated folding of all target proteins investigated to date. The structural basis for this interaction is not presently understood. The second partial reaction, the dissociation of the target protein in a form committed to the native state, appears to proceed by a variety of mechanisms, dependent upon the nature of the target protein in question. Those target proteins (e.g. rubisco, rhodanese, citrate synthase) which require the presence of chaperonin-10, also appear to require the hydrolysis of ATP to bring about the dissociation of the target protein from chaperonin-60. With one exception (pre-β-lactamase) those target proteins which do not require the presence of chaperonin-10 to be released from chaperonin-60, also do not require the hydrolysis of ATP, since non-hydrolysable analogues of ATP support the release of the target protein in a state committed to the native state. The question of whether or not chaperonin-facilitated folding constitutes a catalysed event is addressed.

Keywords

Target Protein High Ionic Strength Binary Complex Rate Enhancement Partial Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media Dordrecht 1993

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