FIGURE 3. A conjectural plot of the free energy, G, for conversion of monomeric GNNQQNY, M, to the aggregated state, Mn.

From the following article:

Structure of the cross-beta spine of amyloid-like fibrils

Rebecca Nelson, Michael R. Sawaya, Melinda Balbirnie, Anders Ø. Madsen, Christian Riekel, Robert Grothe and David Eisenberg

Nature 435, 773-778(9 June 2005)

doi:10.1038/nature03680

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The standard free energy change DeltaG0 for the conversion is small, so that the change in DeltaG is controlled mainly by the concentration of monomer. At low concentrations, the monomeric state is favoured over the aggregated state, and the aggregated state is favoured at high concentrations. There is a significant kinetic barrier to formation of the aggregated state, DeltaGformation. At high concentrations of protein, the barrier to re-dissolve fibres, DeltaGdissolution, is very large.

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