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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.
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]
Copyright of European Physical Journal E -- Soft Matter is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Coil-helix transition in poly(L-glutamic acid): Evidence for a 3-state non-cooperative process.
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  Data: <searchLink fieldCode="DE" term="%22Polyglutamic+acid%22">Polyglutamic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Cooperative+processing%22">Cooperative processing</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink><br /><searchLink fieldCode="DE" term="%22Osmotic+coefficients%22">Osmotic coefficients</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+self-assembly%22">Molecular self-assembly</searchLink>
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  Label: Abstract
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  Data: 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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  Data: <i>Copyright of European Physical Journal E -- Soft Matter is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epje/i2012-12100-4
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      – Code: eng
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      – SubjectFull: Polyglutamic acid
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      – SubjectFull: Cooperative processing
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      – SubjectFull: Molecular weights
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      – SubjectFull: Osmotic coefficients
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      – SubjectFull: Molecular self-assembly
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      – TitleFull: Coil-helix transition in poly(L-glutamic acid): Evidence for a 3-state non-cooperative process.
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              Text: Oct2012
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