Ca2+ binding to site I of the cardiac Ca2+ pump is sufficient to dissociate phospholamban.

Abstract excerpt

Phospholamban (PLB) inhibits the activity of SERCA2a, the Ca(2+)-ATPase in cardiac sarcoplasmic reticulum, by decreasing the apparent affinity of the enzyme for Ca(2+). Recent cross-linking studies have suggested that PLB binding and Ca(2+) binding to SERCA2a are mutually exclusive. PLB binds to the E2 conformation of the Ca(2+)-ATPase, preventing formation of E1, the conformation that binds two Ca(2+) (at sites...

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