Effect of intracellular diffusion on current--voltage                 curves in potassium channels

Daniele Andreucci; Dario Bellaveglia; Emilio N.M. Cirillo; Silvia Marconi

doi:10.3934/dcdsb.2014.19.1837

Article Contents

2014, Volume 19, Issue 7: 1837-1853. Doi: 10.3934/dcdsb.2014.19.1837

This issue Previous Article Viscoelastic fluids: Free energies, differential problems and asymptotic behaviour Next Article Mixed norms, functional Inequalities, and Hamilton-Jacobi equations

Effect of intracellular diffusion on current--voltage curves in potassium channels

1.
Dipartimento di Scienze di Base e Applicate per l'Ingegneria, Sapienza Università di Roma, via A. Scarpa 16, I-00161, Roma

Received: March 31, 2013

Revised: June 30, 2013

Published: August 2014

Abstract Related Papers Cited by

Abstract

We study the effect of intracellular ion diffusion on ionic currents permeating through the cell membrane. Ion flux across the cell membrane is mediated by specific channels, which have been widely studied in recent years with remarkable results: very precise measurements of the true current across a single channel are now available. Nevertheless, a complete understanding of this phenomenon is still lacking, though molecular dynamics and kinetic models have provided partial insights. In this paper we demonstrate, by analyzing the KcsA current-voltage currents via a suitable lattice model, that intracellular diffusion plays a crucial role in the permeation phenomenon. We believe that the interplay between the channel behavior and the ion diffusion in the cell is a key ingredient for a full explanation of the current-voltage curves.

Keywords:

Mathematics Subject Classification: Primary: 92B05, 60G50; Secondary: 92C37.

Citation:

Related Papers

Cited by

References

[1]	A. Abenavoli, M. L. Di Francesco, I. Schroeder, S. Epimoshko, S. Gazzarini, U. P. Hansen G. Thiel and A. Moroni, Fast and slow gating are inherent properties of the pore module of the K$^+$ channel Kcv, J. Gen. Physiol., 134 (2009), 219-229.doi: 10.1085/jgp.200910266.
[2]	D. Andreucci, D. Bellaveglia, E. N. M. Cirillo and S. Marconi, Monte Carlo study of gating and selection in potassium channels, Physical Review E, 84 (2011), 021920.doi: 10.1103/PhysRevE.84.021920.
[3]	D. Andreucci, D. Bellaveglia, E. N. M. Cirillo and S. Marconi, Flux through a time-periodic gate: Monte Carlo test of a Homogenization result, Simultech 2013, Proceedings of the 3rd International Conference on Simulation and Modeling Methodologies, Technologies and Applications, pp. 626-635.
[4]	D. Andreucci and D. Bellaveglia, Permeability of interfaces with alternating pores in parabolic problems, Asymptotic Analysis, 79 (2012), 189-227.
[5]	J. rAqvist and V. Luzhkov, Ion permeation mechanism of the potassium channel, Nature, 404 (2000), 881-884.
[6]	S. Bernèche and B. Roux, A microscopic view of ion conduction through the K$^+$ channel, PNAS, 100 (2003), 8644-8648.
[7]	S. Chowdhuri and A. Chandra, Molecular dynamics simulations of aqueous NaCl and KCl solutions: Effects of ion concentration on the single-particle, pair, and collective dynamical properties of ions and water molecules, J. Chem. Phys., 115 (2001), 3732-3741.doi: 10.1063/1.1387447.
[8]	E. N. M. Cirillo and A. Muntean, Dynamics of pedestrians in regions with no visibility - a lattice model without exclusion, Physica A, 392 (2013), 3578-3588.doi: 10.1016/j.physa.2013.04.029.
[9]	E. N. M. Cirillo and A. Muntean, Can cooperation slow down emergency evacuations?, Comptes Rendus Mecanique, 340 (2012), 626-628.doi: 10.1016/j.crme.2012.09.003.
[10]	M. Ciszkowska, L. Zeng, E. O. Stejskal and J. G. Osteryoung, Transport of Thallium(I) Counterion in Polyelectrolyte Solution Determined by Voltammetry with Microelectrodes and by Pulsed-Field-Gradient, Spin-Echo NMR, J. Phys. Chem., 99 (1995), 11764-11769.doi: 10.1021/j100030a022.
[11]	E. L. Cussler, Diffusion, Second Edition, Cambridge University Press, Cambridge, UK, 1997.doi: 10.1017/CBO9780511805134.
[12]	D. A. Doyle, C. J. Morais, R. A. Pfuetzner, A. kuo, J. M. Gulbis, S. L. Cohen, B. T. Chait and R. MacKinnon, The structure of the potassium channel: Molecular basis of K$^+$ conduction and selectivity, Science, 280 (1998), 69-77.doi: 10.1126/science.280.5360.69.
[13]	J.-F. Dufréche, O. Bernard, S. Durand-Vidal and P. Turq, Analytical Theories of Transport in Concentrated Electrolyte Solutions from the MSA, J. Phys. Chem. B, 109 (2005), 9873-9884.
[14]	D. Fedida and J. C. Hesketh, Gating of voltage-dependent potassium channels, Prog. Bio. Mol. Biology, 75 (2001), 165-199.doi: 10.1016/S0079-6107(01)00006-2.
[15]	S. A. N. Goldstein, D. Bockenhauer, I. O'Kelly and N. Zilberberg, Potassium leak channels and the Kcnk family of two-p-domain subunits, Nature Reviews Neuroscience, 2 (2001), 175-184.
[16]	G. Grimmet and D. Stirzaker, Probability and Random Processes, Oxford University Press Inc., New York, US, 2001.
[17]	H. S. Harned and J. A. Shropshire, The Diffusion Coefficietn at $25^o$ of Potassium Chloride at Low Concentrations in $0.25$ Molar Aqueous Sucrose Solutions, J. of the American Chemical Society, 80 (1958), 5652-5653.
[18]	L. Heginbotham and R. MacKinnon, Conduction Properties of the Cloned Shaker K$^+$ Channel, Biophysical Journal, 65 (1993), 2089-2096.doi: 10.1016/S0006-3495(93)81244-X.
[19]	B. Hille, Ion Channels of Excitable Membranes, Third Edition, Sinauer Associates Inc., Sunderland, MA, USA, 2001.
[20]	A. L. Hodgkin and A. F. Huxley, The components of membrane conductance in the giant axon of Loligo, J. Physiol., 116 (1952), 473-496.
[21]	A. L. Hodgkin and R. D. Keynes, The potassium permeability of a giant nerve fibre, J. Physiol., 128 (1955), 61-88.
[22]	A. L. Hodgkin and R. D. Keynes, The mobility and diffusion coefficient of potassium in giant axons from SEPIA, J. Physiol., 119 (1953), 513-528.
[23]	S. Imai, M. Osawa, K. Takeichi and I. Shimada, Structural basis underlying the dual gate properties of KcsA, PNAS, 107 (2010), 6216-6221.doi: 10.1073/pnas.0911270107.
[24]	M. LeMasurier, L. Heginbotham and C. Miller, Kcsa: It's a Potassium Channel, J. Gen. Physiol., 118 (2001), 303-313.doi: 10.1085/jgp.118.3.303.
[25]	S. Mafé and J. Pellicer, Ion conduction in the KcsA potassium channel analyzed with a minimal kinetic model, Phy. Rev. E, 71 (2005), 022901.
[26]	C. Miller, An overview of the potassium channel family, Genome Biology, 1 (2000), reviews0004.
[27]	C. Miller, Ionic hopping defended, J. Gen. Physiol., 113 (1999), 783-787.doi: 10.1085/jgp.113.6.783.
[28]	E. Neher and B. Sakmann, Single-channel currents recorded from membrane of denervated frog muscle fibres, Nature, 260 (1976), 799-802.doi: 10.1038/260799a0.
[29]	P. H. Nelson, A permeation theory for single-file ion channels: Corresponding occupancy states produce Michaelis-Menten behavior, J. Chem. Phys., 117 (2002), 11396-11403.doi: 10.1063/1.1522709.
[30]	P. H. Nelson, Modeling the concentration-dependent permeation modes of the KcsA potassium ion channel, Phys. Rev. E, 68 (2003), 061908.doi: 10.1103/PhysRevE.68.061908.
[31]	P. H. Nelson, A permeation theory for single-file ion channels: One- and two-step models, J. Chem. Phys., 134 (2011), 165102.doi: 10.1063/1.3580562.
[32]	M. Recanatini, A. Cavalli and M. Masetti, Modeling hERG and its interactions with drugs: Recent advances in light of current potassium channel simulations, Chem. Med. Chem., 3 (2008), 523-535.doi: 10.1002/cmdc.200700264.
[33]	M. L. Renart, E. Montoya, A. M. Fernández, M. L. Molina, J. A. Poveda, J. A. Encinar, J. L. Ayala, A. V. Ferrer-Montiel, J. Gómez, A. Morales and J. M. González Ros, Controbution of Ion inding Affinity to Ion Selectivity and Permeation in KcsA, a Model Potassium Channel, Biochemistry, 51 (2012), 3891-3900.
[34]	I. Schroeder, U. P. Hansen, Saturation and Microsecond Gating of Current Indicate Depletion-induced Instability of the MaxiK Selectivity Filter, J. Gen. Physiol., 130 (2007), 83-97.doi: 10.1085/jgp.200709802.
[35]	A. M. J. VanDongen, Structure and Function of Ion Channels: A Hole in Four?, Comm. Theor. Biol., 2 (1992), 429-451.
[36]	A. M. J. VanDongen, K channel gating by an affinity-switching selectivity filter, PNAS, 101 (2004), 3248-3252.doi: 10.1073/pnas.0308743101.
[37]	Y. Zhou and R. Mackinnon, The occupancy of ions in the K$^+$ Selectivity Filter: Charge balance and coupling of ion binding to a protein conformational change underlie high conduction rates, J. Mol. Biol., 333 (2003), 965-975.doi: 10.1016/j.jmb.2003.09.022.