A protein that aids the assembly and folding of other protein molecules in living cells.
- In addition to folding new proteins, chaperonins also re-fold old proteins which have somehow gotten twisted out of shape.
- The best studied chaperone is the bacterial chaperonin, GroEL, a large protein shaped like a double ring with dyad symmetry under certain conditions.
- The biogenesis of microtubules in the cell comprises a series of complex steps, including protein-folding reactions catalyzed by chaperonins.
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