Potassium (K+), the most abundant cation in biological organisms, plays a crucial role in the survival and development of plant cells, modulation of basic mechanisms such as enzyme activity, electrical membrane potentials, plant turgor and cellular homeostasis. Due to the absence of a Na+/K+ exchanger, which widely exists in animal …
A more direct measurement of q in Drosophila melanogaster Shaker 29-4 potassium channels yields a q value of 12.3 e0, which can be explained by a model for channel activation in which the equilibria of voltage-dependent steps are altered in the mutant channels. The high sensitivity of voltage-gated ion channels to changes in …
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Voltage-activated potassium (Kv) channels open and close in response to changes in membrane voltage, serving critical functions in electrical signaling in neurons …
Gating of single Shaker potassium channels in Drosophila muscle and in Xenopus oocytes injected with Shaker mRNA. Proc Natl Acad Sci U S A. 1989 Sep; 86 (18):7243–7247. [PMC free article] [Google Scholar] Zagotta WN, Hoshi T, Aldrich RW. Restoration of inactivation in mutants of Shaker potassium channels by a peptide …
We screened a rice (Oryza sativa L. 'Nipponbare') full-length cDNA expression library through functional complementation in yeast (Saccharomyces cerevisiae) to find novel cation transporters involved in salt tolerance. We found that expression of a cDNA clone, encoding the rice homolog of Shaker fam …
In 1987, two groups cloned the DNA that encodes a potassium-ion (K +) channel for the first time 1 – 3. The channel, called Shaker, was predicted to contain …
Maintaining Na + /K + homeostasis is a critical feature for plant survival under salt stress, which depends on the operation of Na + and K + transporters. Although some K + transporters mediating root K + uptake have been reported to be essential to the maintenance of Na + /K + homeostasis, the effect of K + long-distance translocation via …
The Drosophila Shaker (Sh) gene appears to encode a type of voltage-sensitive potassium (K+) channel called the A channel. We have isolated Sh as part of a 350 kb chromosomal walk. The region around Sh contains four identified transcription units. We find that Sh corresponds to a very large transcri …
We have determined the crystal structure of the T1 domain of a Shaker potassium channel at 1.55 Å resolution. The structure reveals that four identical subunits are arranged in a four-fold ...
The resting and activated conformations of the K V 1.2–2.1 voltage-sensing domain. (A) Experimentally determined activated conformation (Protein Data Bank ID code 2R9R).Note that R1 in Kv1.2–2.1 is glutamine, whereas R1 in Shaker is arginine. (B) Hypothetical resting/closed conformation.The yellow sphere represents the Ca 2+ in the …
The molecular targets and neural circuits that underlie general anesthesia are not fully elucidated. Here, we directly demonstrate that Kv1-family (Shaker-related) delayed rectifier K + channels in the central medial thalamic nucleus (CMT) are important targets for volatile anesthetics.The modulation of Kv1 channels by volatiles is network specific as …
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The primary components of the PCB Processor are: Hammer Mill – Using the screen with holes, this machine breaks up the components to ; 1/8" pieces and discharges them onto the shaker table to separate the larger metal from the board material.; Using the screen with slots, the board material is fully pulverized to liberate the metals from the plastics …
The potassium channels encoded by the Drosophila Shaker gene activate and inactivate rapidly when the membrane potential becomes more positive. Site-directed mutagenesis and single-channel patch-clamp recording were used to explore the molecular transitions that underlie inactivation in Shaker potassium channels expressed in …
We have determined the crystal structure of the T1 domain of a Shaker potassium channel at 1.55 Å resolution. The structure reveals that four identical …
Shaker potassium channels from Drosophila are composed of four identical subunits. The contribution of a single subunit to the inactivation gating transition was …
Gating of single Shaker potassium channels in Drosophila muscle and in Xenopus oocytes injected with Shaker mRNA. Proc Natl Acad Sci U S A. 1989 Sep; 86 (18):7243–7247. [PMC free article] [Google Scholar] Zagotta WN, Hoshi T, Aldrich RW. Restoration of inactivation in mutants of Shaker potassium channels by a peptide …
In response to step depolarization, I K through Shaker K + channels activates with a noticeable lag; I K has a prominent sigmoidal time course, which is illustrated for …
We have addressed this problem by using fluorescence resonance energy transfer as a spectroscopic ruler15,16,17 to determine distances between S4s in the Shaker K+ channel in different gating states.
In the pore-deletion mutant Shaker-iVSD, the pore domain (S5-S6) after position I384 and almost the complete C-terminus were removed and a cysteine at position A359 in the S3-S4 linker was introduced to follow conformational changes (Figure 1a, bottom, for details see Materials and methods).Shaker-iVSD mutants were transiently …
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Here, we illustrate the properties of 31 Shaker-type channels, or putative Shaker-type channels, which have been genetically identified in 12 different plant …
Genes and neural circuits coordinately regulate animal sleep. However, it remains elusive how these endogenous factors shape sleep upon environmental changes. Here, we demonstrate that Shaker (Sh)-expressing GABAergic neurons projecting onto dorsal fan-shaped body (dFSB) regulate temperature-adaptiv …
Site-directed mutagenesis and single-channel patch-clamp recording were used to explore the molecular transitions that underlie inactivation in Shaker potassium channels …
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K + channels of the Shaker family have been shown to play crucial roles in K + uptake and transport. Cotton (Gossypium hirsutum) is an important cash crop.In this study, the 24 Shaker family genes were identified in cotton. Phylogenetic analysis suggests that they were assigned to five clusters. Additionally, their chromosomal location, …
By PCR of genomic DNA with primers based on regions conserved between Drosophila Shaker and a mouse voltage-gated potassium channel, Ramaswami et al. (1990) isolated fragments of several related human genes. They used the fragments to screen cDNA libraries and cloned cDNAs encoding several potassium channels that they designated …
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