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- Publisher Website: 10.7554/eLife.39122
- Scopus: eid_2-s2.0-85055077330
- PMID: 30311910
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Article: Calcium-dependent electrostatic control of anion access to the pore of the calcium-activated chloride channel TMEM16A
Title | Calcium-dependent electrostatic control of anion access to the pore of the calcium-activated chloride channel TMEM16A |
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Authors | |
Issue Date | 2018 |
Citation | eLife, 2018, v. 7, article no. e39122 How to Cite? |
Abstract | TMEM16A is a ligand-gated anion channel that is activated by intracellular Ca 2+ . This channel comprises two independent pores and closely apposed Ca 2+ binding sites that are contained within each subunit of a homodimeric protein. Previously we characterized the influence of positively charged pore-lining residues on anion conduction (Paulino et al., 2017a). Here, we demonstrate the electrostatic control of permeation by the bound calcium ions in mouse TMEM16A using electrophysiology and Poisson-Boltzmann calculations. The currents of constitutively active mutants lose their outward rectification as a function of Ca 2+ concentration due to the alleviation of energy barriers for anion conduction. This phenomenon originates from Coulombic interactions between the bound Ca 2+ and permeating anions and thus demonstrates that an electrostatic gate imposed by the vacant binding site present in the sterically open pore, is released by Ca 2+ binding to enable an otherwise sub-conductive pore to conduct with full capacity. |
Persistent Identifier | http://hdl.handle.net/10722/343270 |
DC Field | Value | Language |
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dc.contributor.author | Lam, Andy K.M. | - |
dc.contributor.author | Dutzler, Raimund | - |
dc.date.accessioned | 2024-05-10T09:06:48Z | - |
dc.date.available | 2024-05-10T09:06:48Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | eLife, 2018, v. 7, article no. e39122 | - |
dc.identifier.uri | http://hdl.handle.net/10722/343270 | - |
dc.description.abstract | TMEM16A is a ligand-gated anion channel that is activated by intracellular Ca 2+ . This channel comprises two independent pores and closely apposed Ca 2+ binding sites that are contained within each subunit of a homodimeric protein. Previously we characterized the influence of positively charged pore-lining residues on anion conduction (Paulino et al., 2017a). Here, we demonstrate the electrostatic control of permeation by the bound calcium ions in mouse TMEM16A using electrophysiology and Poisson-Boltzmann calculations. The currents of constitutively active mutants lose their outward rectification as a function of Ca 2+ concentration due to the alleviation of energy barriers for anion conduction. This phenomenon originates from Coulombic interactions between the bound Ca 2+ and permeating anions and thus demonstrates that an electrostatic gate imposed by the vacant binding site present in the sterically open pore, is released by Ca 2+ binding to enable an otherwise sub-conductive pore to conduct with full capacity. | - |
dc.language | eng | - |
dc.relation.ispartof | eLife | - |
dc.title | Calcium-dependent electrostatic control of anion access to the pore of the calcium-activated chloride channel TMEM16A | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.7554/eLife.39122 | - |
dc.identifier.pmid | 30311910 | - |
dc.identifier.scopus | eid_2-s2.0-85055077330 | - |
dc.identifier.volume | 7 | - |
dc.identifier.spage | article no. e39122 | - |
dc.identifier.epage | article no. e39122 | - |
dc.identifier.eissn | 2050-084X | - |