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Molecular recognition and self-assembly special feature: Squaring cooperative binding circles.

ABSTRACT: The cooperative binding effects of viologens and pyridines to a synthetic bivalent porphyrin receptor are used as a model system to study how the magnitudes of these effects relate to the experimentally obtained values. The full thermodynamic and kinetic circles concerning both activation and inhibition of the cage of the receptor for the binding of viologens were measured and evaluated. The results strongly emphasize the apparent character of measured binding and rate constants, in which the fractional saturation of receptors with other guests is linearly expressed in these constants. The presented method can be used as a simple tool to better analyze and comprehend the experimentally observed kinetics and thermodynamics of natural and artificial cooperative systems.

SUBMITTER: Deutman AB 

PROVIDER: S-EPMC2705591 | biostudies-other | 2009 Jun

REPOSITORIES: biostudies-other

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Molecular recognition and self-assembly special feature: Squaring cooperative binding circles.

Deutman Alexander B C AB   Monnereau Cyrille C   Moalin Mohamed M   Coumans Ruud G E RG   Veling Nico N   Coenen Michiel M   Smits Jan M M JM   de Gelder René R   Elemans Johannes A A W JA   Ercolani Gianfranco G   Nolte Roeland J M RJ   Rowan Alan E AE  

Proceedings of the National Academy of Sciences of the United States of America 20090521 26

The cooperative binding effects of viologens and pyridines to a synthetic bivalent porphyrin receptor are used as a model system to study how the magnitudes of these effects relate to the experimentally obtained values. The full thermodynamic and kinetic circles concerning both activation and inhibition of the cage of the receptor for the binding of viologens were measured and evaluated. The results strongly emphasize the apparent character of measured binding and rate constants, in which the fr  ...[more]

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