Figure 1.
Schematic representation of the reversible interaction of 21-amino-9α-hydroxy-ryanodine with its site on the channel. On binding, the ryanoid induces a modified conductance state with high open probability. With the ryanoid bound, the channel can close but cannot enter the normal open state. When 21-amino-9α-hydroxy-ryanodine dissociates from its site, channel gating and ion handling return to normal. Dwell times in the unmodified and modified states are monitored using the pattern recognition program described in materials and methods. The probability of the channel being in the modified state (P mod) is then calculated for the entire 6-min recording as described in the text.