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Failure of chaperonin for protein folding

Which of the following scenarios would most likely result in the failure of a chaperonin to facilitate proper protein folding?

a Increased expression of heat shock proteins (HSPs) in the cytosol b Increased temperature leading to partial protein unfolding c Deletion of the substrate-binding domain in HSP90 d Functional mutation in the GroEL protein e Overexpression of co-chaperones that enhance chaperonin function

The most likely cause is a functional mutation in the GroEL protein, since GroEL is the core chaperonin responsible for forming the folding chamber. If GroEL is defective, the folding process cannot occur correctly, regardless of other chaperone activity.

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