Coil-helix transition in poly(L-glutamic acid): Evidence for a 3-state non-cooperative process.
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| Title: | Coil-helix transition in poly(L-glutamic acid): Evidence for a 3-state non-cooperative process. |
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| Authors: | Zalczer, G.1 Gilbert.Zalczer@cea.fr |
| Source: | European Physical Journal E -- Soft Matter. Oct2012, Vol. 35 Issue 10, p1-4. 4p. |
| Subjects: | Polyglutamic acid, Cooperative processing, Molecular weights, Osmotic coefficients, Molecular self-assembly |
| Abstract: | 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 the presence of short and long PEG chains suggest a direct interaction of PEG and PGA rather than an osmotic effect. Graphical abstract: [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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