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Plant Physiol, November 1999, Vol. 121, pp. 753-761
Cloning and First Functional Characterization of a Plant Cyclic
Nucleotide-Gated Cation Channel1
Qiang
Leng,
Richard W.
Mercier,
Weizhe
Yao,2 and
Gerald
A.
Berkowitz*
Department of Plant Science U-67, 1376 Storrs Road, University of
Connecticut, Storrs, Connecticut 06269-4067
Cyclic
nucleotide-gated (cng) non-selective cation channels have been cloned
from a number of animal systems. These channels are characterized by
direct gating upon cAMP or cGMP binding to the intracellular portion of
the channel protein, which leads to an increase in channel conductance.
Animal cng channels are involved in signal transduction systems; they
translate stimulus-induced changes in cytosolic cyclic nucleotide into
altered cell membrane potential and/or cation flux as part of a signal
cascade pathway. Putative plant homologs of animal cng channels have
been identified. However, functional characterization (i.e.
demonstration of cyclic-nucleotide-dependent ion currents) of a plant
cng channel has not yet been accomplished. We report the cloning and
first functional characterization of a plant member of this family of
ion channels. The Arabidopsis cDNA AtCNGC2 encodes a polypeptide with
deduced homology to the -subunit of animal channels, and facilitates
cyclic nucleotide-dependent cation currents upon expression in a number
of heterologous systems. AtCNGC2 expression in a yeast mutant lacking a
low-affinity K+ uptake system complements growth inhibition
only when lipophilic cyclic nucleotides are present in the culture
medium. Voltage clamp analysis indicates that Xenopus
laevis oocytes injected with AtCNGC2 cRNA demonstrate
cyclic-nucleotide-dependent, inward-rectifying K+ currents.
Human embryonic kidney cells (HEK293) transfected with AtCNGC2 cDNA
demonstrate increased permeability to Ca2+ only in the
presence of lipophilic cyclic nucleotides. The evidence presented here
supports the functional classification of AtCNGC2 as a
cyclic-nucleotide-gated cation channel, and presents the first direct
evidence (to our knowledge) identifying a plant member of this ion
channel family.
1
This material is based on work supported by the
National Science Foundation (grant nos. MCB-9513921 and BIR-9512977)
and by the Department of Energy (grant no. DE-FG02-95ER20202). This
is Storrs Agricultural Experiment Station publication no. 1,886.
2
Present address: M.D. Anderson Cancer Center
U-79, Section of Molecular and Cellular Biology, University of Texas,
Houston, TX 77030.
*
Corresponding author; e-mail gberkowi{at}canr1.cag.uconn.edu;
fax 860-486-0682.
© 1999 American Society of Plant Physiologists
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