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Volume 17, Number 4,
Issue of February 15, 1997
pp. 1330-1338
Copyright ©1997 Society for Neuroscience
The Intracellular Loop between Domains I and II of the B-Type
Calcium Channel Confers Aspects of G-Protein Sensitivity to the E-Type
Calcium Channel
Received Oct. 25, 1996; revised Dec. 3, 1996; accepted Dec. 10, 1996.
Karen M. Page,
Gary J. Stephens,
Nicholas S. Berrow, and
Annette C. Dolphin
Department of Pharmacology, Royal Free Hospital School of Medicine,
London NW3 2PF, United Kingdom
Neuronal voltage-dependent calcium channels undergo inhibitory
modulation by G-protein activation, generally involving both kinetic
slowing and steady-state inhibition. We have shown previously that the
-subunit of neuronal calcium channels plays an important role in
this process, because when it is absent, greater receptor-mediated inhibition is observed (). We therefore hypothesized that the calcium channel -subunits normally may occlude
G-protein-mediated inhibition. Calcium channel -subunits bind to the
cytoplasmic loop between transmembrane domains I and II of the
1-subunits (). We have examined the hypothesis
that this loop is involved in G-protein-mediated inhibition by making
chimeras containing the I-II loop of 1B or 1A inserted into
1E ( 1EBE and 1EAE, respectively). This strategy was adopted
because 1B (the molecular counterpart of N-type channels) and, to a
lesser extent, 1A (P/Q-type) are G-protein-modulated, whereas this
has not been observed to any great extent for 1E. Although 1B,
coexpressed with 2- and 1b transiently expressed in COS-7
cells, showed both kinetic slowing and steady-state inhibition when
recorded with GTP S in the patch pipette, both of which were reversed
with a depolarizing prepulse, the chimera 1EBE (and, to a smaller
extent, 1EAE) showed only kinetic slowing in the presence of
GTP S, and this also was reversed by a depolarizing prepulse. These
results indicate that the I-II loop may be the molecular substrate of
kinetic slowing but that the steady-state inhibition shown by 1B may
involve a separate site on this calcium channel.
Key words:
calcium channel;
G-protein;
-subunit;
1B;
1E;
modulation
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