Abstract
A photo-responsive polypeptide membrane composed of poly(L-glutamic acid) (PGA) containing 38.3 mol% pararosaniline leucocyanide (rose(CN)) groups in the side chains was prepared. The ultraviolet (UV) light irradiation could produce cationic side chains along the polypeptide backbone resulting from a photodissociation of rose(CN) side chains in the membrane, which arises an electrostatic repulsive forces among the cationic side chains. This increased electrostatic repulsive force destabilized the α-helical structure of the rose(CN)-PGA in the membrane. As a result, the membrane functions of rose(CN)-PGA, such as membrane potential and transport properties, were strongly dependent on UV light irradiation, especially, the permeability of KCl through the rose(CN)-PGA membrane was much increased by a factor of 16 upon UV irradiation. The photoinduced changes of the membrane functions were reversible and consistent with the photoinduced conformational changes of rose(CN)-PGA membrane.
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Sato, M., Kinoshita, T., Takizawa, A. et al. Photocontrol of the Structure and Functions of a Polypeptide Membrane Composed of Poly(L-glutamic acid) Containing Pararosaniline Leucocyanide Groups in the Side Chains. Polym J 21, 369–376 (1989). https://doi.org/10.1295/polymj.21.369
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DOI: https://doi.org/10.1295/polymj.21.369
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