Coupled gating between cardiac calcium release channels (ryanodine receptors)

Steven O. Marx, Jana Gaburjakova, Marta Gaburjakova, Charles Henrikson, Karol Ondrias, Andrew R. Marks

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)1151-1158
Number of pages8
JournalCirculation Research
Volume88
Issue number11
Publication statusPublished - Jun 8 2001
Externally publishedYes

    Fingerprint

Keywords

  • Ca channels
  • Coupled gating
  • Excitation-contraction coupling
  • FKBP12.6
  • Ryanodine receptors

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Marx, S. O., Gaburjakova, J., Gaburjakova, M., Henrikson, C., Ondrias, K., & Marks, A. R. (2001). Coupled gating between cardiac calcium release channels (ryanodine receptors). Circulation Research, 88(11), 1151-1158.