Measurement of Ca2+ Flux Through Ins(1,4,5)P3 Receptor-Ca2+ Channels in Lipid Bilayers (“Dip-Tip” and “Schindler” Methodology)

  • Edwin C. Thrower
Part of the Methods in Molecular Biology™ book series (MIMB, volume 114)


The inositol (1,4,5)trisphosphate [Ins(1,4,5)P3] receptor [Ins(1,4,5)P3-sensitive-Ca2+ channel] is an intracellular Ca2+ release channel located within the membrane of the smooth endoplasmic reticulum (ER). The study of kinetics and regulation of the Ins(1,4,5)P3 receptor is greatly complicated by problems of the heterogeneity of its environment (such as vesicle size or the number of receptors per unit area of membrane), and difficulties arise in achieving tight control of the ionic composition on the luminal side of the channel. These problems can be overcome, to a certain extent, by monitoring single-channel characteristics of the Ins(1,4,5)P3 receptor (such as channel unit conductance and open and closed times) in artificial planar lipid bilayers and relating this information to that obtained from various other studies.


Critical Micellar Concentration Soybean Lecithin Silicone Grease Teflon Film Vesicle Suspension 
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Copyright information

© Humana Press Inc., Totowa, NJ 1999

Authors and Affiliations

  • Edwin C. Thrower
    • 1
  1. 1.University of East AngliaNorwichUK

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