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Volume 16, Number 16,
Issue of August 15, 1996
pp. 4983-4993
Copyright ©1996 Society for Neuroscience
The 1E Calcium Channel Exhibits Permeation
Properties Similar to Low-Voltage-Activated Calcium Channels
Received Feb. 29, 1996; revised May 23, 1996; accepted May 28, 1996.
Emmanuel Bourinet1,
Gerald W. Zamponi1,
Anthony Stea1,
Tuck W. Soong1,
Bertram A. Lewis2,
Lisa P. Jones2,
David T. Yue2, and
Terry P. Snutch1
1 Biotechnology Laboratory, University of British
Columbia, Vancouver, British Columbia, Canada V6T 1Z3, and
2 Department of Biomedical Engineering, Johns Hopkins
University School of Medicine, Baltimore, Maryland 21205
The physiological and pharmacological properties of the
1E calcium (Ca) channel subtype do not exactly
match any of the established categories described for native neuronal
Ca currents. Many of the key diagnostic features used to assign cloned
Ca channels to their native counterparts, however, are dependent on a
number of factors, including cellular environment, subunit
coexpression, and modulation by second messengers and G-proteins. Here,
by examining the intrinsic pore characteristics of a family of
transiently expressed neuronal Ca channels, we demonstrate that the
permeation properties of 1E closely resemble
those described for a subset of low-threshold Ca channels. The
1A (P-/Q-type), 1B
(N-type), and 1C (L-type) high-threshold Ca
channels all exhibit larger whole-cell currents with barium (Ba) as the
charge carrier as compared with Ca or strontium (Sr). In contrast,
macroscopic 1E currents are largest in Sr,
followed by Ca and then Ba. The unique permeation properties of
1E are maintained at the single-channel level,
are independent of the nature of the expression system, and are not
affected by coexpression of 2 and subunits. Overall, the permeation characteristics of
1E are distinct from those described for
R-type currents and share some similarities with native low-threshold
Ca channels.
Key words:
calcium channel;
permeation;
barium;
strontium;
transient
expression;
conductance;
pore properties
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