Abstract
In real life, the thing that matters about glutamate receptors is their response to the brief pulse of agonist (glutamate) that is released by a presynaptic nerve during synaptic transmission. The brief nature of this pulse makes it likely that postsynaptic channels will experience only a single activation (see below). The receptor is not at equilibrium, and it is the rate at which it works that controls its physiological properties. The study of rates (kinetics) is, therefore, crucial to the understanding of physiology. For some purposes, an empirical description of how things are observed to change is quite sufficient, and such empirical descriptions may be described appropriately as models; but, in order to understand how the receptor actually works, this is not good enough. For this purpose, we must aim to describe the receptor in terms of physical realities. The states in a kinetic mechanism must not be convenient abstractions but actual physical structures.
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Béhé, P., Colquhoun, D., Wyllie, D.J.A. (1999). Activation of Single AMPA- and NMDA-Type Glutamate-Receptor Channels. In: Jonas, P., Monyer, H. (eds) Ionotropic Glutamate Receptors in the CNS. Handbook of Experimental Pharmacology, vol 141. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08022-1_5
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