Chaperonin releases the substrate protein in a form with tendency to aggregate and ability to rebind to chaperonin

FEBS Letters

Taguchi, Hideki¹  Yoshida, Masasuke¹ 

[1] Research Laboratory of Resources Utilization, R-1, Tokyo Institute of Technology, Nagatsuta 4259, Yokohama 226, Japan

关键词: Chaperonin;    GroEL;    Protein folding;    Rhodanese;    NEM;    N-ethylmaleimide;    rhodanese;    thiosulfate sulfurtransferase;   

DOI  :  10.1016/0014-5793(95)00041-7

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

To know whether the protein released from chaperonin GroEL/ES is in a form committed to the native state or still an aggregatable non-native one, two experiments were carried out. Dilution of the [GroEL-substrate protein] binary complex prior to ATP addition significantly improved the yield of folding, suggesting that the released protein has a tendency to aggregate. When N-ethylmaleimide treated GroEL, which can form the binary complex but not release the bound protein, was added to the binary complex prior to ATP addition, productive folding was severely inhibited, indicating that the protein released from GroEL/ES can bind to N-ethylmaleimide treated chaperonin. These data favor the ‘reservoir’ or ‘reversion’ model, in which GroEL/ES acts as a buffer of folding intermediate or mediates reversion of a misfolded protein to a less folded primitive form, rather than the ‘marsupium’ model in which folding of the substrate protein proceeds in chaperonin.

【 授权许可】

Unknown