Abstract
Chaperonin GroEL assists protein folding in the presence of ATP and magnesium. Recent studies have shown that several divalent cations other than magnesium induce conformational changes of GroEL, thereby influencing chaperonin-assisted protein folding, but little is known about the detailed mechanism for such actions. Thus, the effects of divalent cations on protein encapsulation by GroEL/ES complexes were investigated. Of the divalent cations, not only magnesium, but also manganese ions enabled the functional refolding and release of 5,10-methylenetetrahydroforate reductase (METF) by GroEL. Neither ATP hydrolysis nor METF refolding was observed in the presence of zinc ion, whereas only ATP hydrolysis was induced by cobalt and nickel ions. SDS-PAGE and gel filtration analyses revealed that cobalt, nickel and zinc ions permit the formation of stable substrate-GroEL-GroES cis-ternary complexes, but prevent the release of METF from GroEL.
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Acknowledgements
This study was supported in part by the program for Basic Research Activities for Innovative Biosciences (Bio-oriented Technology Research Advancement Institution: BRAIN) of Japan, and by the “Academic Frontier” Project for Private Universities: matching fund subsidy from MEXT of Japan, 2004–2008.
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Okuda, H., Sakuhana, C., Yamamoto, R. et al. Effects of divalent cations on encapsulation and release in the GroEL-assisted folding. Biometals 20, 903–910 (2007). https://doi.org/10.1007/s10534-006-9078-z
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DOI: https://doi.org/10.1007/s10534-006-9078-z