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Article |
From the Center for Molecular Cardiology, Department of Medicine, and Department of Pharmacology, Columbia University College of Physicians and Surgeons, New York, NY, and the Institute of Molecular Physiology and Genetics (K.O.), Slovak Academy of Sciences, Bratislava, Slovak Republic.
Correspondence to Andrew R. Marks, MD, Center for Molecular Cardiology, Box 65, Columbia University College of Physicians and Surgeons, Room 9-401, 630 W 168th St, New York, NY 10032. E-mail arm42{at}columbia.edu
Abstract
Abstract Excitation-contraction coupling in heart muscle requires the activation of Ca2+-release channels/type 2 ryanodine receptors (RyR2s) by Ca2+ influx. RyR2s are arranged on the sarcoplasmic reticular membrane in closely packed arrays such that their large cytoplasmic domains contact one another. We now show that multiple RyR2s can be isolated under conditions such that they remain physically coupled to one another. When these coupled channels are examined in planar lipid bilayers, multiple channels exhibit simultaneous gating, termed "coupled gating." Removal of the regulatory subunit, the FK506 binding protein (FKBP12.6), functionally but not physically uncouples multiple RyR2 channels. Coupled gating between RyR2 channels may be an important regulatory mechanism in excitation-contraction coupling as well as in other signaling pathways involving intracellular Ca2+ release.
Key Words: ryanodine receptors Ca2+ channels coupled gating FKBP12.6 excitation-contraction coupling
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