Regulation of Ionic Channels by G Proteins

  • A. M. Brown
  • A. Yatani
  • G. Kirsch
  • A. M. J. VanDongen
  • B. Schubert
  • J. Codina
  • L. Birnbaumer
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 308)


Signals may flow through membranes by a pathway composed of three elements: receptor, G protein and effector. At present we know of about 80 different receptors, about 15 different G proteins and about 15 different effectors (1,2). The primary structures of noradrenergic, dopamine, 5-hydroxytryptamine and rhodopsin receptors are similar indicating that the receptors form a family (2). The predicted secondary structures have seven membrane spanning a helices with the greatest differences among receptors occurring in the cytoplasmic linkers (3). The G proteins also form a family in which heterogeneity resides largely in the a subunits for which some 15 different cDNAs have been described (4,2). Two to four forms of the β subunit have been described and there are at least three forms of the y subunit (4,2). By contrast, the effectors are quite different from each other and there appears to be no homology among adenylyl cyclase (AC) (4), cGMP phosphodiesterase (PDE) and voltage-dependent ionic channels (5,6), although the predicted secondary structures of AC and voltage-gated channels are similar. Within this group, voltage-gated channels clearly are a family (7).


Adenylyl Cyclase Guanine Nucleotide Planar Lipid Bilayer Single Channel Current Protein Gating 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • A. M. Brown
    • 1
  • A. Yatani
    • 1
  • G. Kirsch
    • 1
  • A. M. J. VanDongen
    • 1
  • B. Schubert
    • 1
  • J. Codina
    • 2
  • L. Birnbaumer
    • 1
    • 2
  1. 1.Departments of Molecular Physiology and BiophysicsBaylor College of MedicineHoustonUSA
  2. 2.Departments of Cell BiologyBaylor College of MedicineHoustonUSA

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