PubMed Journals Articles About "Piezo Proteins Pore Forming Subunits Mechanically Activated Channels" 
Piezo Proteins Pore Forming Subunits Mechanically Activated Channels PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Piezo Proteins Pore Forming Subunits Mechanically Activated Channels articles that have been published worldwide.
More Information about "Piezo Proteins Pore Forming Subunits Mechanically Activated Channels" on BioPortfolio
We have published hundreds of Piezo Proteins Pore Forming Subunits Mechanically Activated Channels news stories on BioPortfolio along with dozens of Piezo Proteins Pore Forming Subunits Mechanically Activated Channels Clinical Trials and PubMed Articles about Piezo Proteins Pore Forming Subunits Mechanically Activated Channels for you to read. In addition to the medical data, news and clinical trials, BioPortfolio also has a large collection of Piezo Proteins Pore Forming Subunits Mechanically Activated Channels Companies in our database. You can also find out about relevant Piezo Proteins Pore Forming Subunits Mechanically Activated Channels Drugs and Medications on this site too.
Showing "Piezo proteins pore forming subunits mechanically activated channels" PubMed Articles 1–25 of 41,000+
Small-conductance ca(2+)-activated k(+) channels: form and function.
Small-conductance Ca(2+)-activated K(+) channels (SK channels) are widely expressed throughout the central nervous system. These channels are activated solely by increases in intracellular Ca(2+). SK channels are stable macromolecular complexes of the ion pore-forming subunits with calmodulin, which serves as the intrinsic Ca(2+) gating subunit, as well as with protein kinase CK2 and protein phosphatase 2A, which modulate Ca(2+) sensitivity. Well-known for their roles in regulating somatic excitability in c...
STIM and Orai proteins and the non-capacitative ARC channels.
The ARC channel is a small conductance, highly Ca2+-selective ion channel whose activation is specifically dependent on low concentrations of arachidonic acid acting at an intracellular site. They are widely distributed in diverse cell types where they provide an alternative, store-independent pathway for agonist-activated Ca2+ entry. Although biophysically similar to the store-operated CRAC channels, these two conductances function under distinct conditions of agonist stimulation, with the ARC channels pro...
Dorsal root ganglia contain heterogeneous populations of primary afferent neurons that transmit various sensory stimuli. This functional diversity may be correlated with differential expression of voltage-gated K(+) (Kv) channels. Here, we examine cellular distributions of Kv4 pore-forming and ancillary subunits that are responsible for fast-inactivating A-type K(+) current.
Neuronal Voltage-Gated K(+) (Kv) Channels Function in Macromolecular Complexes.
Considerable evidence indicates that native neuronal voltage-gated K(+) (Kv) currents reflect the functioning of macromolecular Kv channel complexes, composed of pore-forming (alpha) subunits, cytosolic and transmembrane accessory subunits, together with regulatory and scaffolding proteins. The individual components of these macromolecular complexes appear to influence the stability, the trafficking, the localization and/or the biophysical properties of the channels. Recent studies suggest that Kv channel a...
Although highly selective Ca(2+) entry pathways play a critical role in agonist-activated Ca(2+) signals in non-excitable cells, only with the recent discovery of the Orai proteins have the first insights into the molecular nature of these pathways been possible. To date, just two such highly Ca(2+)-selective "Orai channels" have been identified in native cells-the store-operated CRAC channels and the store-independent, arachidonic acid-activated ARC channels. Studies have shown that the functional CRAC cha...
Two-pore Channels Form Homo- and Heterodimers.
Two-pore channels (TPCs) have been recently identified as NAADP-regulated Ca(2+) release channels, which are localized on the endolysosomal system. TPCs have a 12-transmembrane domain (TMD) structure and are evolutionary intermediates between the 24-TMD α-subunits of Na(+) or Ca(2+) channels and the transient receptor potential channel superfamily, which have six TMDs in a single subunit and form tetramers with 24 TMDs as active channels. Based on this relationship, it is predicted that TPCs dimerize to fo...
Arrangement of Kv1 {alpha} subunits dictates sensitivity to tetraethylammonium.
Shaker-related Kv1 channels contain four channel-forming alpha subunits. Subfamily member Kv1.1 often occurs oligomerized with Kv1.2 alpha subunits in synaptic membranes, and so information was sought on the influence of their positions within tetramers on the channels' properties. Kv1.1 and 1.2 alpha genes were tandem linked in various arrangements, followed by expression as single-chain proteins in mammalian cells. As some concatenations reported previously seemed not to reliably position Kv1 subunits in...
KCNQ1 subdomains involved in KCNE modulation revealed by an invertebrate KCNQ1 orthologue.
KCNQ1 channels are voltage-gated potassium channels that are widely expressed in various non-neuronal tissues, such as the heart, pancreas, and intestine. KCNE proteins are known as the auxiliary subunits for KCNQ1 channels. The effects and functions of the different KCNE proteins on KCNQ1 modulation are various; the KCNQ1-KCNE1 ion channel complex produces a slowly activating potassium channel that is crucial for heartbeat regulation, while the KCNE3 protein makes KCNQ1 channels constitutively active, whic...
Distal end of carboxyl terminus is not essential for the assembly of rat eag1 potassium channels.
The assembly of four pore-forming α-subunits into tetramers is a prerequisite for the formation of functional K(+) channels. A short carboxyl assembly domain (CAD) in the distal end of the cytoplasmic carboxyl terminus has been implicated in the assembly of Eag α-subunits, a subfamily of the ether-à-go-go K(+) channel family. The precise role of CAD in the formation of Eag tetrameric channels, however, remains unclear. Moreover, it has not been determined whether other protein regions also contribute to...
Mechanotransduction channels mediate several common sensory modalities such as hearing, touch, and proprioception; however, very little is known about the molecular identities of these channels. Many TRP family channels have been implicated in mechanosensation, but none have been demonstrated to form a mechanotransduction channel, raising the question of whether TRP proteins simply play indirect roles in mechanosensation. Using Caenorhabditis elegans as a model, here we have recorded a mechanosensitive cond...
TRPM1 is the founding member of the melastatin subgroup of transient receptor potential (TRP) proteins, but it has not yet been firmly established that TRPM1 proteins form ion channels. Consequently, the biophysical and pharmacological properties of these proteins are largely unknown. Here we show that heterologous expression of TRPM1 proteins induces ionic conductances that can be activated by extracellular steroid application. However the current amplitudes observed were too small to enable a reliable bio...
K(2P)2.1 (TREK1) two-pore-domain potassium channels control electrical activity in the central nervous system (CNS) and in the heart. Auxiliary β subunits (Kvβ) increase functional K(+) channel diversity in the CNS. Based on similar tissue distribution and common functional significance of Kvβ2 protein and K(2P)2.1 channels in neuronal excitability, we hypothesized that Kvβ2 subunits modulate K(2P)2.1 currents.
Piezo1 and Piezo2 Are Essential Components of Distinct Mechanically Activated Cation Channels.
Mechanical stimuli drive many physiological processes, including touch and pain sensation, hearing, and blood pressure regulation. Mechanically activated (MA) cation channel activities have been recorded in many cells, but the responsible molecules have not been identified. We characterized a rapidly adapting MA current in a mouse neuroblastoma cell line. Expression profiling and RNAi knockdown of candidate genes identified Piezo1 (Fam38A) to be required for MA currents in these cells. Piezo1 and related Pi...
Rationale: Ca(2+)-activated K(+) channels are present in a wide variety of cells. We have previously reported the presence of small conductance Ca(2+)-activated K(+) (SK or KCa) channels in human and mouse cardiac myocytes that contribute functionally toward the shape and duration of cardiac action potentials. Three isoforms of SK channel subunits (SK1, -2, and -3) are found to be expressed. Moreover, there is differential expression with more abundant SK channels in the atria and pacemaking tissues compare...
Effect of bestrophin-1 on L-type Ca(2+) channel activity depends on the Ca(2+) channel beta-subunit.
Best's vitelliforme macular degeneration is an inherited retinal degeneration associated with a reduction of the light-peak in the patient's electro-oculogram. Bestrophin-1, the product of the disease-promoting/forming gene can function as regulator of voltage-dependent L-type Ca(2+) channels in the retinal pigment epithelium (RPE). Since mice deficient for either beta4-subunits or Ca(V)1.3 subunits show reduced light-peaks, the regulatory function of bestrophin-1 on heterologously expressed Ca(2+) channels...
Targeting SKCa Channels in Cancer: Potential New Therapeutic Approaches.
Many studies have reported changes in potassium channel expression in many cancers and the involvement of these channels in various stages of cancer progression. By contrast, data concerning SKCa channels (small conductance calcium-activated potassium channels) have only recently become available. This review aims i) to present the structure and physiology of SKCa channels, ii) to provide an overview of published data concerning the SKCa proteins produced in tumor cells, and, whenever possible, the biologic...
TRPV3 ion channels mediate thermo-transduction, nociception, inflammation and dermatitis in mammals. TRPV1-4 proteins have been shown to have conserved cysteine-residues in the pore-forming regions. These residues participate in channel activation via S-nitrosylation of channel proteins. Camphor is a commonly used ligand for TRPV3 channels. Thus the knowledge about the potential binding/interacting site(s) for camphor will help to design effective and potent analgesic compounds. In an overlap-extension PCR...
A Specific Two-pore Domain Potassium Channel Blocker Defines the Structure of the TASK-1 Open Pore.
Two-pore domain potassium (K(2P)) channels play a key role in setting the membrane potential of excitable cells. Despite their role as putative targets for drugs and general anesthetics, little is known about the structure and the drug binding site of K(2P) channels. We describe A1899 as a potent and highly selective blocker of the K(2P) channel TASK-1. As A1899 acts as an open-channel blocker and binds to residues forming the wall of the central cavity, the drug was used to further our understanding of the...
Potassium-channel mutations and cardiac arrhythmias-diagnosis and therapy.
The coordinated generation and propagation of action potentials within cardiomyocytes creates the intrinsic electrical stimuli that are responsible for maintaining the electromechanical pump function of the human heart. The synchronous opening and closing of cardiac Na(+), Ca(2+), and K(+) channels corresponds with the activation and inactivation of inward depolarizing (Na(+) and Ca(2+)) and outward repolarizing (K(+)) currents that underlie the various phases of the cardiac action potential (resting, depol...
Mechanosensitive channels: in touch with piezo.
Mechanosensory transduction underlies touch, hearing and proprioception and requires mechanosensitive channels that are directly gated by forces; however, the molecular identities of these channels remain largely elusive. A new study has identified Piezo1 and Piezo2 as a novel class of mechanosensitive channels.
Oligomerization of Cav{beta} subunits is an essential correlate of Ca2+ channel activity.
Voltage-gated calcium channels conduct Ca(2+) ions in response to membrane depolarization. The resulting transient increase in cytoplasmic free calcium concentration is a critical trigger for the initiation of such vital responses as muscle contraction and transcription. L-type Cav1.2 calcium channels are complexes of the pore-forming alpha1C subunit associated with cytosolic Cavbeta subunits. All major Cavbetas share a highly homologous membrane associated guanylate kinase-like (MAGUK) domain that binds to...
Pore-forming toxins (PFTs) are proteins that are secreted as soluble molecules and are inserted into membranes to form oligomeric transmembrane pores. In this paper, we report the crystal structure of Fragaceatoxin C (FraC), a PFT isolated from the sea anemone Actinia fragacea, at 1.8 Å resolution. It consists of a crown-shaped nonamer with an external diameter of about 11.0 nm and an internal diameter of approximately 5.0 nm. Cryoelectron microscopy studies of FraC in lipid bilayers reveal the pore str...
Functional consequences of Kir2.1/Kir2.2 subunit heteromerization.
Kir2 subunits form channels that underlie classical strongly inwardly rectifying potassium currents. While homomeric Kir2 channels display a number of distinct and physiologically important properties, the functional properties of heteromeric Kir2 assemblies, as well as the stoichiometries and the arrangements of Kir2 subunits in native channels, remain largely unknown. Therefore, we have implemented a concatemeric approach, whereby all four cloned Kir2 subunits were linked in tandem, in order to study the...
Voltage-gated sodium (Na(v)) and calcium (Ca(v)) channels, which play essential biological roles, are characterized by their ability to discriminate the "native" ion from other competing cations. Surprisingly, Na(+)-selective bacterial Na(v) and high voltage-activated Ca(2+)-selective Ca(v) channels both exhibit selectivity filters (the narrowest part of the open pore) lined by four Glu residues that interact specifically with the permeating ions. This raises the intriguing question why selectivity filters...
Local Ca(2+) signaling occurring within nanometers of voltage-gated Ca(2+) (Cav) channels is crucial for CNS function, yet the molecular composition of Cav channel nano-environments is largely unresolved. Here, we used a proteomic strategy combining knockout-controlled multiepitope affinity purifications with high-resolution quantitative MS for comprehensive analysis of the molecular nano-environments of the Cav2 channel family in the whole rodent brain. The analysis shows that Cav2 channels, composed of po...
