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Junctophilins: a novel family of junctional membrane complex proteins.

Junctional complexes between the plasma membrane (PM) and endoplasmic/sarcoplasmic reticulum (ER/ SR) are a common feature of all excitable cell types and mediate cross-talk between cell surface and intracellular ion channels. We have identified the junctophilins (JPs), a novel conserved family of proteins that are components of the junctional complexes. JPs are composed of a carboxy-terminal hydrophobic segment spanning the ER/SR membrane and a remaining cytoplasmic domain that shows specific affinity for the PM. In mouse, there are at least three JP subtypes: JP-1, -2, and -3. JP-2 is abundantly expressed in the heart, and mutant mice lacking JP-2 exhibited embryonic lethality. Cardiac myocytes from the mutant mice showed deficiency of the junctional membrane complexes and abnormal Ca2+ transients. Our results suggest that JPs are important components of junctional membrane complexes.

Pubmed ID: 10949023


  • Takeshima H
  • Komazaki S
  • Nishi M
  • Iino M
  • Kangawa K


Molecular cell

Publication Data

July 31, 2000

Associated Grants


Mesh Terms

  • Amino Acid Motifs
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Calcium Signaling
  • Cell Membrane
  • DNA Primers
  • Endoplasmic Reticulum
  • Male
  • Membrane Proteins
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Molecular Sequence Data
  • Muscle, Skeletal
  • Myocardium
  • Rabbits
  • Sarcoplasmic Reticulum
  • Sequence Homology, Amino Acid
  • Tissue Distribution