1
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Pinto M, Saliminasab M, Harris A, Lazaratos M, Bondar AN, Ladizhansky V, Brown LS. The retinal chromophore environment in an inward light-driven proton pump studied by solid-state NMR and hydrogen-bond network analysis. Phys Chem Chem Phys 2024; 26:24090-24108. [PMID: 39248601 DOI: 10.1039/d4cp02611j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/10/2024]
Abstract
Inward proton pumping is a relatively new function for microbial rhodopsins, retinal-binding light-driven membrane proteins. So far, it has been demonstrated for two unrelated subgroups of microbial rhodopsins, xenorhodopsins and schizorhodopsins. A number of recent studies suggest unique retinal-protein interactions as being responsible for the reversed direction of proton transport in the latter group. Here, we use solid-state NMR to analyze the retinal chromophore environment and configuration in an inward proton-pumping Antarctic schizorhodopsin. Using fully 13C-labeled retinal, we have assigned chemical shifts for every carbon atom and, assisted by structure modelling and molecular dynamics simulations, made a comparison with well-studied outward proton pumps, identifying locations of the unique protein-chromophore interactions for this functional subclass of microbial rhodopsins. Both the NMR results and molecular dynamics simulations point to the distinctive polar environment in the proximal part of the retinal, which may result in a hydration pattern dramatically different from that of the outward proton pumps, causing the reversed proton transport.
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Affiliation(s)
- Marie Pinto
- Department of Physics and Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
| | - Maryam Saliminasab
- Department of Physics and Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
| | - Andrew Harris
- Department of Physics and Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
| | - Michalis Lazaratos
- Freie Universität Berlin, Physics Department, Theoretical Molecular Biophysics Group, D-14195 Berlin, Germany
| | - Ana-Nicoleta Bondar
- University of Bucharest, Faculty of Physics, Măgurele 077125, Romania
- Forschungszentrum Jülich, Institute for Computational Biomedicine (IAS-5/INM-9), 52428 Jülich, Germany
| | - Vladimir Ladizhansky
- Department of Physics and Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
| | - Leonid S Brown
- Department of Physics and Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
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2
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Nachliel E, Gutman M. Reaction within the coulomb-cage; science in retrospect. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2023; 1865:184071. [PMID: 36244436 DOI: 10.1016/j.bbamem.2022.184071] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 08/01/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022]
Abstract
The Coulomb-cage is defined as the space where the electrostatic interaction between two bodies is more intensive than the thermal energy (kBT). For small molecule, the Coulomb-cage is a small sphere, extending only few water molecules towards the bulk and its radius is sensitive to the ionic strength of the solution. For charged proteins or membranal structures, the Coulomb-cage can engulf large fraction of the surface and provides a preferred pathway for ion propagation along the surface. Similarly, electrostatic potential at the inner space of a channel can form preferential trajectories passage for ions. The dynamics of ions inside the Coulomb-cage of ions was formulated by the studies of proton-anion recombination of excited photoacids. In the present article, we recount the study of intra- Coulomb-cage reaction taking place on the surface of macro-molecular bodies like micelles, membranes, proteins and intra-protein cavities. The study progressed stepwise, tracing the dynamics of a proton ejected from a photo-acid molecule located at defined sites (on membrane, inter-membrane space, active site of enzyme, inside Large Pore Channels etc.). Accumulation of experimental observations encouraged us to study of the reaction mechanism by molecular dynamics simulations of ions within the Coulomb-cage of proteins surface or inside large pores. The intra-Coulomb-cage proton transfer events follows closely the fine structure of the electrostatic field inside the cage and reflects the shape of nearby dielectric boundaries, the temporal ordering of the solvent molecules and the structural fluctuations of the charged side chains. The article sums some 40 years of research, which in retrospect clarifies the intra-Coulomb-cage reaction mechanism.
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Affiliation(s)
- E Nachliel
- Laser Laboratory for Fast Reactions, Dep. Of Biochemistry and Molecular Biology, Life Sciences, Tel Aviv University, Israel
| | - M Gutman
- Laser Laboratory for Fast Reactions, Dep. Of Biochemistry and Molecular Biology, Life Sciences, Tel Aviv University, Israel.
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3
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Friedman R. Simulations of Biomolecules in Electrolyte Solutions. ADVANCED THEORY AND SIMULATIONS 2019. [DOI: 10.1002/adts.201800163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ran Friedman
- Department of Chemistry and Biomedical SciencesLinnæus UniversityKalmar SE‐391 82 Sweden
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4
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Kemmler L, Ibrahim M, Dobbek H, Zouni A, Bondar AN. Dynamic water bridging and proton transfer at a surface carboxylate cluster of photosystem II. Phys Chem Chem Phys 2019; 21:25449-25466. [DOI: 10.1039/c9cp03926k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A hydrogen-bond cluster at a negatively-charged protein interface with a bound protein and long-lived waters might be a proton storage site.
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Affiliation(s)
- Lukas Kemmler
- Freie Universität Berlin
- Department of Physics
- Theoretical Molecular Biophysics Group
- D-14195 Berlin
- Germany
| | - Mohamed Ibrahim
- Humboldt Universtät zu Berlin
- Institute for Biology, Structural Biology and Biochemistry
- Berlin
- Germany
| | - Holger Dobbek
- Humboldt Universtät zu Berlin
- Institute for Biology, Structural Biology and Biochemistry
- Berlin
- Germany
| | - Athina Zouni
- Humboldt Universtät zu Berlin
- Institute for Biology, Biophysics of Photosynthesis
- Berlin
- Germany
| | - Ana-Nicoleta Bondar
- Freie Universität Berlin
- Department of Physics
- Theoretical Molecular Biophysics Group
- D-14195 Berlin
- Germany
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5
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Awasthi AA, Singh PK. Excited-State Proton Transfer on the Surface of a Therapeutic Protein, Protamine. J Phys Chem B 2017; 121:10306-10317. [PMID: 29032681 DOI: 10.1021/acs.jpcb.7b07151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Proton transfer reactions on biosurfaces play an important role in a myriad of biological processes. Herein, the excited-state proton transfer reaction of 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) has been investigated in the presence of an important therapeutic protein, Protamine (PrS), using ground-state absorption, steady-state, and detailed time-resolved emission measurements. HPTS forms a 1:1 complex with Protamine with a high association constant of 2.6 × 104 M-1. The binding of HPTS with Protamine leads to a significant modulation in the ground-state prototropic equilibrium causing a downward shift of 1.1 unit in the acidity constant (pKa). In contrast to a large number of reports of slow proton transfer of HPTS on biosurfaces, interestingly, HPTS registers a faster proton transfer event in the presence of Protamine as compared to that of even the bulk aqueous buffer medium. Furthermore, the dimensionality of the proton diffusion process is also significantly reduced on the surface of Protamine that is in contrast to the behavior of HPTS in the bulk aqueous buffer medium, where the proton diffusion process is three-dimensional. The effect of ionic strength on the binding of HPTS toward PrS suggests a predominant role of electrostatic interaction between anionic HPTS and cationic Protamine, which is further supported by molecular docking simulations which predict that the most preferable binding site for HPTS on the surface of Protamine is surrounded by multiple cationic arginine residues.
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Affiliation(s)
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India.,Homi Bhabha National Institute , Training School Complex, Anushaktinagar, Mumbai 400094, India
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6
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del Val C, Bondar AN. Charged groups at binding interfaces of the PsbO subunit of photosystem II: A combined bioinformatics and simulation study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:432-441. [DOI: 10.1016/j.bbabio.2017.03.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 03/13/2017] [Accepted: 03/14/2017] [Indexed: 01/20/2023]
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7
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Ferenczi EA, Vierock J, Atsuta-Tsunoda K, Tsunoda SP, Ramakrishnan C, Gorini C, Thompson K, Lee SY, Berndt A, Perry C, Minniberger S, Vogt A, Mattis J, Prakash R, Delp S, Deisseroth K, Hegemann P. Optogenetic approaches addressing extracellular modulation of neural excitability. Sci Rep 2016; 6:23947. [PMID: 27045897 PMCID: PMC4820717 DOI: 10.1038/srep23947] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 03/10/2016] [Indexed: 12/28/2022] Open
Abstract
The extracellular ionic environment in neural tissue has the capacity to influence, and be influenced by, natural bouts of neural activity. We employed optogenetic approaches to control and investigate these interactions within and between cells, and across spatial scales. We began by developing a temporally precise means to study microdomain-scale interactions between extracellular protons and acid-sensing ion channels (ASICs). By coupling single-component proton-transporting optogenetic tools to ASICs to create two-component optogenetic constructs (TCOs), we found that acidification of the local extracellular membrane surface by a light-activated proton pump recruited a slow inward ASIC current, which required molecular proximity of the two components on the membrane. To elicit more global effects of activity modulation on ‘bystander’ neurons not under direct control, we used densely-expressed depolarizing (ChR2) or hyperpolarizing (eArch3.0, eNpHR3.0) tools to create a slow non-synaptic membrane current in bystander neurons, which matched the current direction seen in the directly modulated neurons. Extracellular protons played contributory role but were insufficient to explain the entire bystander effect, suggesting the recruitment of other mechanisms. Together, these findings present a new approach to the engineering of multicomponent optogenetic tools to manipulate ionic microdomains, and probe the complex neuronal-extracellular space interactions that regulate neural excitability.
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Affiliation(s)
- Emily A Ferenczi
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA.,Neurosciences, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Johannes Vierock
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Kyoko Atsuta-Tsunoda
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Satoshi P Tsunoda
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Charu Ramakrishnan
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Christopher Gorini
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Kimberly Thompson
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Soo Yeun Lee
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Andre Berndt
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Chelsey Perry
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Sonja Minniberger
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Arend Vogt
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
| | - Joanna Mattis
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA.,Neurosciences, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Rohit Prakash
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA.,Neurosciences, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Scott Delp
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA
| | - Karl Deisseroth
- Bioengineering, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA.,HHMI, Stanford University, 318 Campus Drive, Stanford, CA 94305, USA.,Department of Psychiatry &Behavioral Science, Stanford University, 401 Quarry Road, Stanford, CA 94305, USA
| | - Peter Hegemann
- Institute of Biology, Experimental Biophysics, Invalidenstraße 42, D-10115 Berlin, Germany
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8
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Lorch S, Capponi S, Pieront F, Bondar AN. Dynamic Carboxylate/Water Networks on the Surface of the PsbO Subunit of Photosystem II. J Phys Chem B 2015; 119:12172-81. [DOI: 10.1021/acs.jpcb.5b06594] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastian Lorch
- Theoretical
Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Sara Capponi
- Department
of Physiology and Biophysics, University of California at Irvine, Medical Sciences I, Irvine, California 92697, United States
| | - Florian Pieront
- Theoretical
Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Ana-Nicoleta Bondar
- Theoretical
Molecular Biophysics, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
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9
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Omotuyi IO. Ebola virus envelope glycoprotein derived peptide in human Furin-bound state: computational studies. J Biomol Struct Dyn 2014; 33:461-70. [PMID: 25347780 DOI: 10.1080/07391102.2014.981207] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Ebola virus (EboV) is currently ravaging West Africa with estimated case fatality rate of 52%. Currently, no drug treatment is available and immunoglobulin therapy is still at the rudimentary stage. For anti-EboV drug development, druggable viral and host protein targets, including human Furin are under intense investigation. Here, molecular dynamics simulation was performed on Apo-Furin, meta-guanidinomethyl-Phac-RVR-Amba-bound, and two EboV glycoprotein (GP) 494-TGGRRTRREA-503/Furin complexes (Accurate and one amino acid shift alignment). The results of the simulation established ligand-induced desolvation of Furin active site and structural compactness. Accurately aligned EboV-GP peptide exhibited a tighter binding mode with Furin and showed 1.5- and 3.0-fold MMPBSA binding free energy estimate compared with the displaced peptide and inhibitor, respectively. The difference in free energy was traced to the difference in contribution of threonine residues of the peptides. Furthermore, Furin subsites I conferred substrate specificity and ligand binding accuracy. Accurately aligned peptide trapped active site His194 side chain into gauche (-) (+60(o)) χ1-dihedral compared with gauche+ (-60(o)) in other biosystems while Asp153 is trapped in gauche+ (-60(o)) in ligand bound not Apo state. Ramachandran plot showed that the scissile Arg8 of the accurately aligned peptide showed β conformation distribution as apposed to 310R, αL, and 310L. Finally, the active site proximal Na(+) binding is dependent on substrate peptide occupancy of the active site but detaches in the absence of a ligand. In conclusion, Furin might represent candidate drug target for Ebola virus disease treatment via therapeutic target of the active site and Na(+) binding pocket.
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Affiliation(s)
- I Olaposi Omotuyi
- a Department of Pharmacology and Therapeutic Innovation , Graduate School of Biomedical Science, Nagasaki University , Nagasaki , Japan
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10
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Extended protein/water H-bond networks in photosynthetic water oxidation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1177-90. [PMID: 22503827 DOI: 10.1016/j.bbabio.2012.03.031] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 03/19/2012] [Accepted: 03/28/2012] [Indexed: 11/23/2022]
Abstract
Oxidation of water molecules in the photosystem II (PSII) protein complex proceeds at the manganese-calcium complex, which is buried deeply in the lumenal part of PSII. Understanding the PSII function requires knowledge of the intricate coupling between the water-oxidation chemistry and the dynamic proton management by the PSII protein matrix. Here we assess the structural basis for long-distance proton transfer in the interior of PSII and for proton management at its surface. Using the recent high-resolution crystal structure of PSII, we investigate prominent hydrogen-bonded networks of the lumenal side of PSII. This analysis leads to the identification of clusters of polar groups and hydrogen-bonded networks consisting of amino acid residues and water molecules. We suggest that long-distance proton transfer and conformational coupling is facilitated by hydrogen-bonded networks that often involve more than one protein subunit. Proton-storing Asp/Glu dyads, such as the D1-E65/D2-E312 dyad connected to a complex water-wire network, may be particularly important for coupling protonation states to the protein conformation. Clusters of carboxylic amino acids could participate in proton management at the lumenal surface of PSII. We propose that rather than having a classical hydrophobic protein interior, the lumenal side of PSII resembles a complex polyelectrolyte with evolutionary optimized hydrogen-bonding networks. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.
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11
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Friedman R. Ions and the Protein Surface Revisited: Extensive Molecular Dynamics Simulations and Analysis of Protein Structures in Alkali-Chloride Solutions. J Phys Chem B 2011; 115:9213-23. [DOI: 10.1021/jp112155m] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ran Friedman
- School of Natural Sciences, Linnæus University, 391 82 Kalmar, Sweden
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12
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Cohen B, Martin Álvarez C, Alarcos Carmona N, Organero JA, Douhal A. Proton-Transfer Reaction Dynamics within the Human Serum Albumin Protein. J Phys Chem B 2011; 115:7637-47. [DOI: 10.1021/jp200294q] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Boiko Cohen
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Cristina Martin Álvarez
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Noemí Alarcos Carmona
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Juan Angel Organero
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
| | - Abderrazzak Douhal
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S/N, 45071 Toledo, Spain
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13
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Kurakin A. The self-organizing fractal theory as a universal discovery method: the phenomenon of life. Theor Biol Med Model 2011; 8:4. [PMID: 21447162 PMCID: PMC3080324 DOI: 10.1186/1742-4682-8-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Accepted: 03/29/2011] [Indexed: 12/15/2022] Open
Abstract
A universal discovery method potentially applicable to all disciplines studying organizational phenomena has been developed. This method takes advantage of a new form of global symmetry, namely, scale-invariance of self-organizational dynamics of energy/matter at all levels of organizational hierarchy, from elementary particles through cells and organisms to the Universe as a whole. The method is based on an alternative conceptualization of physical reality postulating that the energy/matter comprising the Universe is far from equilibrium, that it exists as a flow, and that it develops via self-organization in accordance with the empirical laws of nonequilibrium thermodynamics. It is postulated that the energy/matter flowing through and comprising the Universe evolves as a multiscale, self-similar structure-process, i.e., as a self-organizing fractal. This means that certain organizational structures and processes are scale-invariant and are reproduced at all levels of the organizational hierarchy. Being a form of symmetry, scale-invariance naturally lends itself to a new discovery method that allows for the deduction of missing information by comparing scale-invariant organizational patterns across different levels of the organizational hierarchy.An application of the new discovery method to life sciences reveals that moving electrons represent a keystone physical force (flux) that powers, animates, informs, and binds all living structures-processes into a planetary-wide, multiscale system of electron flow/circulation, and that all living organisms and their larger-scale organizations emerge to function as electron transport networks that are supported by and, at the same time, support the flow of electrons down the Earth's redox gradient maintained along the core-mantle-crust-ocean-atmosphere axis of the planet. The presented findings lead to a radically new perspective on the nature and origin of life, suggesting that living matter is an organizational state/phase of nonliving matter and a natural consequence of the evolution and self-organization of nonliving matter.The presented paradigm opens doors for explosive advances in many disciplines, by uniting them within a single conceptual framework and providing a discovery method that allows for the systematic generation of knowledge through comparison and complementation of empirical data across different sciences and disciplines.
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Affiliation(s)
- Alexei Kurakin
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA.
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14
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DeCoursey TE. Voltage-gated proton channels find their dream job managing the respiratory burst in phagocytes. Physiology (Bethesda) 2010; 25:27-40. [PMID: 20134026 PMCID: PMC3023998 DOI: 10.1152/physiol.00039.2009] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The voltage-gated proton channel bears surprising resemblance to the voltage-sensing domain (S1-S4) of other voltage-gated ion channels but is a dimer with two conduction pathways. The proton channel seems designed for efficient proton extrusion from cells. In phagocytes, it facilitates the production of reactive oxygen species by NADPH oxidase.
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Affiliation(s)
- Thomas E DeCoursey
- Department of Molecular Biophysics and Physiology, Rush University Medical Center, Chicago, Illinois, USA.
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15
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16
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Wolf I, Shapira A, Giniger R, Miller Y, Gerber R, Cheshnovsky O. Critical Size for Intracluster Proton Transfer from Water to an Anion. Angew Chem Int Ed Engl 2008; 47:6272-4. [DOI: 10.1002/anie.200800542] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Wolf I, Shapira A, Giniger R, Miller Y, Gerber R, Cheshnovsky O. Critical Size for Intracluster Proton Transfer from Water to an Anion. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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