ArticleThe Journal of general physiology2011
Alignment of transmembrane regions in the cystic fibrosis transmembrane conductance regulator chloride channel pore.
Article in The Journal of general physiology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.
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Who cites it
35 citing papers in PubMed, 55 citations in OpenAlex.
- Cystic Fibrosis: Understanding Cystic Fibrosis Transmembrane Regulator Mutation Classification and Modulator Therapies.Advances in respiratory medicine · 2024Review
- CFTR Modulators: From Mechanism to Targeted Therapeutics.Handbook of experimental pharmacology · 2024Article
- The molecular evolution of function in the CFTR chloride channel.The Journal of general physiology · 2021Article
- Two positively charged amino acid side-chains in the inner vestibule of the CFTR channel pore play analogous roles in controlling anion binding and anion conductance.Cellular and molecular life sciences : CMLS · 2021Article
- Positional effects of premature termination codons on the biochemical and biophysical properties of CFTR.The Journal of physiology · 2020Article
- Discovering the chloride pathway in the CFTR channel.Cellular and molecular life sciences : CMLS · 2020Article
- Contribution of the eighth transmembrane segment to the function of the CFTR chloride channel pore.Cellular and molecular life sciences : CMLS · 2019Article
- Conformational change of the extracellular parts of the CFTR protein during channel gating.Cellular and molecular life sciences : CMLS · 2018Article
- Structure of Transmembrane Helix 8 and Possible Membrane Defects in CFTR.Biophysical journal · 2018Article
- Functional organization of cytoplasmic portals controlling access to the cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel pore.The Journal of biological chemistry · 2018Article
- Structural mechanisms of CFTR function and dysfunction.The Journal of general physiology · 2018Review
- Functional characterization reveals that zebrafish CFTR prefers to occupy closed channel conformations.PloS one · 2018Article
- Transmembrane helical interactions in the CFTR channel pore.PLoS computational biology · 2017Article
- Molecular modelling and molecular dynamics of CFTR.Cellular and molecular life sciences : CMLS · 2017Review
- Architecture and functional properties of the CFTR channel pore.Cellular and molecular life sciences : CMLS · 2017Review
- Spatial positioning of CFTR's pore-lining residues affirms an asymmetrical contribution of transmembrane segments to the anion permeation pathway.The Journal of general physiology · 2016Article
- Cytoplasmic pathway followed by chloride ions to enter the CFTR channel pore.Cellular and molecular life sciences : CMLS · 2016Article
- Cystic Fibrosis Transmembrane Conductance Regulator (CFTR): CLOSED AND OPEN STATE CHANNEL MODELS.The Journal of biological chemistry · 2015Article
- Functional Architecture of the Cytoplasmic Entrance to the Cystic Fibrosis Transmembrane Conductance Regulator Chloride Channel Pore.The Journal of biological chemistry · 2015Article
- Full-open and closed CFTR channels, with lateral tunnels from the cytoplasm and an alternative position of the F508 region, as revealed by molecular dynamics.Cellular and molecular life sciences : CMLS · 2015Article
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
Different transmembrane (TM) α helices are known to line the pore of the cystic fibrosis TM conductance regulator (CFTR) Cl(-) channel. However, the relative alignment of these TMs in the three-dimensional structure of the pore is not known. We have used patch-clamp recording to investigate the accessibility of cytoplasmically applied cysteine-reactive reagents to cysteines introduced along the length of the pore-lining first TM (TM1) of a cysteine-less variant of CFTR. We find that methanethiosulfonate (MTS) reagents irreversibly modify cysteines substituted for TM1 residues K95, Q98, P99, and L102 when applied to the cytoplasmic side of open channels. Residues closer to the intracellular end of TM1 (Y84-T94) were not apparently modified by MTS reagents, suggesting that this part of TM1 does not line the pore. None of the internal MTS reagent-reactive cysteines was modified by extracellular [2-(trimethylammonium)ethyl] MTS. Only K95C, closest to the putative intracellular end of TM1, was apparently modified by intracellular [2-sulfonatoethyl] MTS before channel activation. Comparison of these results with recent work on CFTR-TM6 suggests a relative alignment of these two important TMs along the axis of the pore. This alignment was tested experimentally by formation of disulfide bridges between pairs of cysteines introduced into these two TMs. Currents carried by the double mutants K95C/I344C and Q98C/I344C, but not by the corresponding single-site mutants, were inhibited by the oxidizing agent copper(II)-o-phenanthroline. This inhibition was irreversible on washing but could be reversed by the reducing agent dithiothreitol, suggesting disulfide bond formation between the introduced cysteine side chains. These results allow us to develop a model of the relative positions, functional contributions, and alignment of two important TMs lining the CFTR pore. Such functional information is necessary to understand and interpret the three-dimensional structure of the pore.
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