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• W2056501063 abstract "The kinetic and equilibrium properties of a clustering process were studied as a function of temperature for two point mutants of a 31 kDa fragment derived from the cytoplasmic region of the Escherichia coli aspartate receptor (C-fragment), which were shown previously to have a greater tendency to form clusters relative to the wild-type C-fragment [Long, D. G., & Weis, R. M. (1992) Biochemistry 31, 9904-9911]. The clustering equilibria were different for the two C-fragments. Monomers of a serine-461 to leucine (S461L) mutant C-fragment were in equilibrium with dimers, while monomers of a S325L C-fragment were in equilibrium with trimers. The positive values for delta H degree, delta S degree, and delta Cp degree of dissociation estimated from a van't Hoff analysis, and the differences in the CD spectra of isolated monomers and oligomers, demonstrated that the monomers were less well-folded than the clustered forms. The oligomer dissociation rate exhibited a marked temperature dependence over the range from 4 to 30 degrees C and was remarkably slow at low temperatures; e.g. t1/2 of dimer dissociation for the S461L C-fragment was 85 h at 4 degrees C. The values for delta H degree +2, delta S degree +2, and delta Cp degree +2 derived from the temperature dependence of the dissociation rate were comparable to the corresponding parameters determined in a DSC study of C-fragment denaturation [Wu, J., Long, D. G., & Weis, R. M. (1995) Biochemistry 34, 3056-3065], which indicated that the transition state resembled thermally denatured C-fragment. Octyl glucoside accelerated the dissociation rate by 3-5-fold presumably by lowering the barrier to dissociation. This acceleration and the positive value of delta Cp degree +2 were interpreted as evidence for an increase in solvent accessible hydrophobic groups in the transition state. The molecular basis for the slow rate of dissociation is proposed to result from the conversion of intermolecular coiled coils in the oligomers to an intramolecular coiled coil in the monomer." @default.
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• W2056501063 date "1996-01-01" @default.
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• W2056501063 title "Oligomers of the Cytoplasmic Fragment from the <i>Escherichia coli</i> Aspartate Receptor Dissociate through an Unfolded Transition State" @default.
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• W2056501063 doi "https://doi.org/10.1021/bi961749i" @default.
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