Coil-helix transition in poly(L-glutamic acid) : Evidence for a 3-state non-cooperative process

Details Coil-helix transition in poly(L-glutamic acid) : Evidence for a 3-state non-cooperative process Coil-helix transition in poly(L-glutamic acid) : Evidence for a 3-state non-cooperative process

2012-01-12

arxiv.org/abs/1201.2566v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

A careful analysis of measurements of circular dichroism of poly(L-glutamic acid) (PGA) shows that the data can be very accurately described by introducing a third state for the PGA configuration, in addition to the helix and coil ones, and considering a simple equilibrium between these three states, without cooperativity. The third state is more conspicuous when high molecular weight polyethyleneglycol (PEG) is added. Excluded volume effects shown by differences in presence of short and long PEG chains indicate a direct interaction of PEG and PGA rather than an osmotic effect.

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