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The heart contraction is controlled by the Ca2+-induced Ca2+ release (CICR) between L-type Ca2+ channels and ryanodine receptors (RyRs). The FK506-binding protein FKBP12.6 binds to RyR subunits, but its role in stabilizing RyR function has been debated for long. Recent reports of high-resolution RyR structure show that the HD2 domain that binds to the SPRY2 domain of neighbouring subunit in FKBP-bound RyR1 is detached and invisible in FKBP-null RyR2. The present study was to test the consequence of FKBP12.6 absence on the in situ activation of RyR2.

Sensitized signalling between L-type Ca2+channels and ryanodine receptors in the absence or inhibition of FKBP12.6 in cardiomyocytes

Sensitized signalling between L-type Ca²⁺channels and ryanodine receptors in the absence or inhibition of FKBP12.6 in cardiomyocytes