Observation of the Coexistence of Sodium and Calcium Ions in a DNA G-Quadruplex Ion Channel

2007 ◽  
Vol 129 (33) ◽  
pp. 10106-10107 ◽  
Author(s):  
Michael P. H. Lee ◽  
Gary N. Parkinson ◽  
Pascale Hazel ◽  
Stephen Neidle
Keyword(s):  
Ion Channel ◽  
Calcium Ions ◽  
G Quadruplex

scholarly journals The Nociceptor Ion Channel TRPA1 Is Potentiated and Inactivated by Permeating Calcium Ions

2008 ◽  
Vol 283 (47) ◽  
pp. 32691-32703 ◽  
Author(s):  
Yuanyuan Y. Wang ◽  
Rui B. Chang ◽  
Hang N. Waters ◽  
David D. McKemy ◽  
Emily R. Liman
Keyword(s):  
Ion Channel ◽  
Calcium Ions

scholarly journals Modeling the effect of a electric field on the dynamics of calcium ions in calcium ion channel

2019 ◽  
Vol 18 (4) ◽  
pp. 551-558
Author(s):  
Z Rahimi ◽  
A Lohrasebi ◽  
M Ghorbani ◽  
◽  
◽  
...  
Keyword(s):  
Electric Field ◽  
Ion Channel ◽  
Calcium Ions ◽  
Calcium Ion

scholarly journals Cyclic Nucleotide-Gated Ion Channel 6 Mediates Thermotolerance in Arabidopsis Seedlings by Regulating Hydrogen Peroxide Production via Cytosolic Calcium Ions

2021 ◽  
Vol 12 ◽  
Author(s):  
Wenxu Wang ◽  
Jiaojiao Zhang ◽  
Lijuan Ai ◽  
Dan Wu ◽  
Bing Li ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ion Channel ◽  
Calcium Ions ◽  
Cyclic Nucleotide ◽  
Cytosolic Calcium ◽  
Plant Responses ◽  
Wild Type ◽  
Chain Reactions ◽  
Polymerase Chain Reactions ◽  
In The Wild

We previously reported the involvement of cyclic nucleotide-gated ion channel 6 (CNGC6) and hydrogen peroxide (H2O2) in plant responses to heat shock (HS). To demonstrate their relationship with plant thermotolerance, we assessed the effect of HS on several groups of Arabidopsis (Arabidopsis thaliana) seedlings: wild-type, cngc6 mutant, and its complementation line. Under exposure to HS, the level of H2O2 was lower in the cngc6 mutant seedlings than in the wild-type (WT) seedlings but obviously increased in the complementation line. The treatment of Arabidopsis seeds with calcium ions (Ca2+) increased the H2O2 levels in the seedlings under HS treatment, whereas treatment with a Ca2+ chelator (EGTA) inhibited it, indicating that CNGC6 may stimulate the accumulation of H2O2 in a manner dependent on an increase in cytosolic Ca2+ ([Ca2+]cyt). This point was verified by phenotypic observations and thermotolerance testing with transgenic plants overexpressing AtRbohB and AtRbohD (two genes involved in HS-responsive H2O2 production), respectively, in a cngc6 background. Real-time reverse transcription-polymerase chain reactions and Western blotting suggested that CNGC6 enhanced the gene transcription of HS factors (HSFs) and the accumulation of HS proteins (HSPs) via H2O2. These upon results indicate that H2O2 acts downstream of CNGC6 in the HS signaling pathway, increasing our understanding of the initiation of plants responses to high temperatures.

Single-stranded DNA designed lipophilic G-quadruplexes as transmembrane channels for switchable potassium transport

2019 ◽  
Vol 55 (80) ◽  
pp. 12004-12007 ◽  
Author(s):  
Chunying Li ◽  
Hui Chen ◽  
Li Zhou ◽  
Hui Shi ◽  
Xiaoxiao He ◽  
...  
Keyword(s):  
Ion Channel ◽  
Potassium Transport ◽  
Single Stranded Dna ◽  
G Quadruplex ◽  
Transmembrane Channels

G-quadruplex single-stranded DNA was modified lipophilically and developed as a biomimetic ion channel for selective and switchable K+ transport.

Early in vivo changes in calcium ions, oxidative stress markers, and ion channel immunoreactivity following partial injury to the optic nerve

2011 ◽  
Vol 90 (3) ◽  
pp. 606-618 ◽  
Author(s):  
Jonathan Wells ◽  
Matthew R. Kilburn ◽  
Jeremy A. Shaw ◽  
Carole A. Bartlett ◽  
Alan R. Harvey ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Optic Nerve ◽  
Ion Channel ◽  
Calcium Ions ◽  
Oxidative Stress Markers ◽  
Stress Markers

Influence of Calcium Ions on the Plant Cell Surface: Membrane Fusions and Conformational Changes

1974 ◽  
Vol 32 ◽  
pp. 154-155
Author(s):  
D. James Morré ◽  
Charles E. Bracker ◽  
William J. VanDerWoude
Keyword(s):  
Cell Wall ◽  
Cell Surface ◽  
Conformational Changes ◽  
Calcium Ions ◽  
Surface Membrane ◽  
Carboxyl Groups ◽  
Cross Linking ◽  
Ultrastructural Evidence ◽  
Glycine Max L ◽  
Wall Extensibility

Calcium ions in the concentration range 5-100 mM inhibit auxin-induced cell elongation and wall extensibility of plant stems. Inhibition of wall extensibility requires that the tissue be living; growth inhibition cannot be explained on the basis of cross-linking of carboxyl groups of cell wall uronides by calcium ions. In this study, ultrastructural evidence was sought for an interaction of calcium ions with some component other than the wall at the cell surface of soybean (Glycine max (L.) Merr.) hypocotyls.

Mitochondrial matrix calcium ions regulate energy production in myocardium: A cytochemical study

1990 ◽  
Vol 48 (2) ◽  
pp. 166-167
Author(s):  
W.A. Jacob ◽  
R. Hertsens ◽  
A. Van Bogaert ◽  
M. De Smet
Keyword(s):  
Energy Metabolism ◽  
Calcium Ions ◽  
Energy Production ◽  
Regulation Of Respiration ◽  
Free Calcium ◽  
Mitochondrial Matrix ◽  
Cytochemical Study ◽  
Nmr Techniques

In the past most studies of the control of energy metabolism focus on the role of the phosphorylation potential ATP/ADP.Pi on the regulation of respiration. Studies using NMR techniques have demonstrated that the concentrations of these compounds for oxidation phosphorylation do not change appreciably throughout the cardiac cycle and during increases in cardiac work. Hence regulation of energy production by calcium ions, present in the mitochondrial matrix, has been the object of a number of recent studies.Three exclusively intramitochondnal dehydrogenases are key enzymes for the regulation of oxidative metabolism. They are activated by calcium ions in the low micromolar range. Since, however, earlier estimates of the intramitochondnal calcium, based on equilibrium thermodynamic considerations, were in the millimolar range, a physiological correlation was not evident. The introduction of calcium-sensitive probes fura-2 and indo-1 made monitoring of free calcium during changing energy metabolism possible. These studies were performed on isolated mitochondria and extrapolation to the in vivo situation is more or less speculative.

Myrsinane and related diterpenes from Euphorbia falcata with selective potassium ion channel activity

Planta Medica ◽  
2015 ◽  
Vol 81 (16) ◽  
Author(s):  
A Vasas ◽  
P Orvos ◽  
L Tálosi ◽  
P Forgo ◽  
G Pinke ◽  
...  
Keyword(s):  
Ion Channel ◽  
Potassium Ion ◽  
Channel Activity ◽  
Potassium Ion Channel
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