o-Phthalaldehyde activates the Ca(2+) release mechanism from skeletal muscle sarcoplasmic reticulum.


o-Phthalaldehyde (OPA) is a bifunctional reagent that forms an isoindole derivative by reacting with cysteine and lysine residues separated by approximately 0.3 nm. OPA inhibits sarcoplasmic reticulum (SR) Ca(2+)-ATPase activity at low micromolar concentrations and induces Ca(2+) release from actively loaded SR vesicles by activating the ryanodine receptor… (More)


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