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  • 1
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    Deconstructing voltage sensor function and pharmacology in sodium channels (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-11-14
    Description: Voltage-activated sodium (Na(v)) channels are crucial for the generation and propagation of nerve impulses, and as such are widely targeted by toxins and drugs. The four voltage sensors in Na(v) channels have distinct amino acid sequences, raising fundamental questions about their relative contributions to the function and pharmacology of the channel. Here we use four-fold symmetric voltage-activated potassium (K(v)) channels as reporters to examine the contributions of individual S3b-S4 paddle motifs within Na(v) channel voltage sensors to the kinetics of voltage sensor activation and to forming toxin receptors. Our results uncover binding sites for toxins from tarantula and scorpion venom on each of the four paddle motifs in Na(v) channels, and reveal how paddle-specific interactions can be used to reshape Na(v) channel activity. One paddle motif is unique in that it slows voltage sensor activation, and toxins selectively targeting this motif impede Na(v) channel inactivation. This reporter approach and the principles that emerge will be useful in developing new drugs for treating pain and Na(v) channelopathies.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2587061/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2587061/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bosmans, Frank -- Martin-Eauclaire, Marie-France -- Swartz, Kenton J -- ZIA NS003017-03/Intramural NIH HHS/ -- England -- Nature. 2008 Nov 13;456(7219):202-8. doi: 10.1038/nature07473.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19005548" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; Ion Channel Gating/*drug effects ; Models, Molecular ; Mutagenesis ; Potassium Channels, Voltage-Gated/genetics/metabolism ; Protein Interaction Domains and Motifs/genetics/physiology ; Rats ; Recombinant Fusion Proteins/genetics/metabolism ; Scorpion Venoms/pharmacology ; Sodium Channels/genetics/*metabolism ; Spider Venoms/pharmacology ; Xenopus
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Sensing voltage across lipid membranes (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-12-19
    Description: The detection of electrical potentials across lipid bilayers by specialized membrane proteins is required for many fundamental cellular processes such as the generation and propagation of nerve impulses. These membrane proteins possess modular voltage-sensing domains, a notable example being the S1-S4 domains of voltage-activated ion channels. Ground-breaking structural studies on these domains explain how voltage sensors are designed and reveal important interactions with the surrounding lipid membrane. Although further structures are needed to understand the conformational changes that occur during voltage sensing, the available data help to frame several key concepts that are fundamental to the mechanism of voltage sensing.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2629456/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2629456/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Swartz, Kenton J -- ZIA NS002945-13/Intramural NIH HHS/ -- England -- Nature. 2008 Dec 18;456(7224):891-7. doi: 10.1038/nature07620.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Porter Neuroscience Research Center, Molecular Physiology and Biophysics Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA. swartzk@ninds.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19092925" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/*metabolism ; Humans ; *Ion Channel Gating ; Membrane Lipids/*metabolism ; Membrane Proteins/*chemistry/*metabolism ; Movement ; Protein Structure, Tertiary
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Structure and hydration of membranes embedded with voltage-sensing domains (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-11-27
    Description: Despite the growing number of atomic-resolution membrane protein structures, direct structural information about proteins in their native membrane environment is scarce. This problem is particularly relevant in the case of the highly charged S1-S4 voltage-sensing domains responsible for nerve impulses, where interactions with the lipid bilayer are critical for the function of voltage-activated ion channels. Here we use neutron diffraction, solid-state nuclear magnetic resonance (NMR) spectroscopy and molecular dynamics simulations to investigate the structure and hydration of bilayer membranes containing S1-S4 voltage-sensing domains. Our results show that voltage sensors adopt transmembrane orientations and cause a modest reshaping of the surrounding lipid bilayer, and that water molecules intimately interact with the protein within the membrane. These structural findings indicate that voltage sensors have evolved to interact with the lipid membrane while keeping energetic and structural perturbations to a minimum, and that water penetrates the membrane, to hydrate charged residues and shape the transmembrane electric field.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784928/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784928/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krepkiy, Dmitriy -- Mihailescu, Mihaela -- Freites, J Alfredo -- Schow, Eric V -- Worcester, David L -- Gawrisch, Klaus -- Tobias, Douglas J -- White, Stephen H -- Swartz, Kenton J -- GM74737/GM/NIGMS NIH HHS/ -- GM86685/GM/NIGMS NIH HHS/ -- P01 GM086685/GM/NIGMS NIH HHS/ -- R01 GM074637/GM/NIGMS NIH HHS/ -- R01 RR014812/RR/NCRR NIH HHS/ -- ZIA NS002945-13/Intramural NIH HHS/ -- England -- Nature. 2009 Nov 26;462(7272):473-9. doi: 10.1038/nature08542.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940918" target="_blank"〉PubMed〈/a〉
    Keywords: Archaeal Proteins/chemistry/metabolism ; Circular Dichroism ; Lipid Bilayers/*chemistry/*metabolism ; Membrane Lipids/analysis/chemistry/metabolism ; *Membrane Potentials ; Models, Molecular ; Molecular Dynamics Simulation ; Neutron Diffraction ; Nuclear Magnetic Resonance, Biomolecular ; Potassium Channels, Voltage-Gated/*chemistry/metabolism ; Protein Structure, Tertiary ; Spectrometry, Fluorescence ; Water/*analysis/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Structural biology: Trimeric ion-channel design (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-07-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silberberg, Shai D -- Swartz, Kenton J -- ZIA NS003018-03/Intramural NIH HHS/ -- England -- Nature. 2009 Jul 30;460(7255):580-1. doi: 10.1038/460580a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19641581" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Ion Channels/*chemistry ; Membrane Proteins/*chemistry ; *Models, Molecular ; Protein Binding ; Protein Structure, Tertiary ; Receptors, Purinergic P2/*chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Response:Model of Huntington's disease (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beal, M F -- Kowall, N W -- Swartz, K J -- Ferrante, R J -- Martin, J B -- New York, N.Y. -- Science. 1988 Jul 22;241(4864):475.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17792612" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Gating modifier toxins reveal a conserved structural motif in voltage-gated Ca2+ and K+ channels (1998)
    National Academy of Sciences
    Details
    Publication Date: 1998-07-21
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Palmitoylation influences the function and pharmacology of sodium channels (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-11-28
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Inter- and intrasubunit interactions between transmembrane helices in the open state of P2X receptor channels (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-09-30
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Helical interactions in P2X receptor channels [Physiology] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-10-16
    Description: P2X receptor channels open in response to the binding of extracellular ATP, a property that is essential for purinergic sensory signaling. Apo and ATP-bound X-ray structures of the detergent-solubilized zebrafish P2X4 receptor provide a blueprint for receptor mechanisms but unexpectedly showed large crevices between subunits within the transmembrane (TM) domain...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Palmitoylation influences the function and pharmacology of sodium channels [Physiology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-12-14
    Description: Palmitoylation is a common lipid modification known to regulate the functional properties of various proteins and is a vital step in the biosynthesis of voltage-activated sodium (Nav) channels. We discovered a mutation in an intracellular loop of rNav1.2a (G1079C), which results in a higher apparent affinity for externally applied PaurTx3 and ProTx-II, two voltage sensor toxins isolated from tarantula venom. To explore whether palmitoylation of the introduced cysteine underlies this observation, we compared channel susceptibility to a range of animal toxins in the absence and presence of 2-Br-palmitate, a palmitate analog that prevents palmitate incorporation into proteins, and found that palmitoylation contributes to the increased affinity of PaurTx3 and ProTx-II for G1079C. Further investigations with 2-Br-palmitate revealed that palmitoylation can regulate the gating and pharmacology of wild-type (wt) rNav1.2a. To identify rNav1.2a palmitoylation sites contributing to these phenomena, we substituted three endogenous cysteines predicted to be palmitoylated and found that the gating behavior of this triple cysteine mutant is similar to wt rNav1.2a treated with 2-Br-palmitate. As with chemically depalmitoylated rNav1.2a channels, this mutant also exhibits an increased susceptibility for PaurTx3. Additional mutagenesis experiments showed that palmitoylation of one cysteine in particular (C1182) primarily influences PaurTx3 sensitivity and may enhance the inactivation process of wt rNav1.2a. Overall, our results demonstrate that lipid modifications are capable of altering the gating and pharmacological properties of rNav1.2a.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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