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- W2054956543 abstract "The molecular chaperone, GroEL, is completely disassembled into monomers by the addition of 4,4'-dipyridyl disulfide. The dissociation leads to monomers in a kinetically controlled process. The additions of functional ligands of GroEL such as Mg(2+) or adenine nucleotides produced differences in the observed rates, but at the end of the kinetics, the dissociation was complete. In addition to the information obtained from native gels, the fluorescent probe bis-ANS was utilized to follow the monomer formation. The results demonstrate that the formation of monomers was associated with the exposure of hydrophobic surfaces. This assessment was possible without the use of added chaotropes, such as urea, to dissociate GroEL. Dissociation kinetics were also followed by light scattering. The kinetics of dissociation of the 14mer are cooperative with respect to the concentration of 4,4'-DPDS. Thermodynamic parameters for the kinetic process gave a free energy of activation (DeltaG) of 19.3 +/- 1.2 kcal mol(-1), which was decomposed to an enthalpy of activation (DeltaH) of 19.30 +/- 1.2 kcal mol(-1) and an entropy of activation (DeltaS) of -8.2 +/- 3.9 cal mol(-1) K(-1). We conclude that the dissociation of GroEL observed in this investigation is an enthalpy-controlled process." @default.
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- W2054956543 date "2001-08-01" @default.
- W2054956543 modified "2023-09-30" @default.
- W2054956543 title "The 4,4‘-Dipyridyl Disulfide-Induced Formation of GroEL Monomers Is Cooperative and Leads to Increased Hydrophobic Exposure" @default.
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- W2054956543 doi "https://doi.org/10.1021/bi010831x" @default.
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