1
|
Zhao X, Ding W, Wang H, Wang Y, Liu Y, Li Y, Liu C. Structural Insights and Influence of Terahertz Waves in Midinfrared Region on Kv1.2 Channel Selectivity Filter. ACS OMEGA 2024; 9:9702-9713. [PMID: 38434859 PMCID: PMC10905694 DOI: 10.1021/acsomega.3c09801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/16/2024] [Accepted: 01/23/2024] [Indexed: 03/05/2024]
Abstract
Potassium ion channels are the structural basis for excitation transmission, heartbeat, and other biological processes. The selectivity filter is a critical structural component of potassium ion channels, whose structure is crucial to realizing their function. As biomolecules vibrate and rotate at frequencies in the terahertz band, potassium ion channels are sensitive to terahertz waves. Therefore, it is worthwhile to investigate how the terahertz wave influences the selectivity filter of the potassium channels. In this study, we investigate the structure of the selectivity filter of Kv1.2 potassium ion channels using molecular dynamics simulations. The effect of an electric field on the channel has been examined at four different resonant frequencies of the carbonyl group in SF: 36.75 37.06, 37.68, and 38.2 THz. As indicated by the results, 376GLY appears to be the critical residue in the selectivity filter of the Kv1.2 channel. Its dihedral angle torsion is detrimental to the channel structural stability and the transmembrane movement of potassium ions. 36.75 THz is the resonance frequency of the carbonyl group of 376GLY. Among all four frequencies explored, the applied terahertz electric field of this frequency has the most significant impact on the channel structure, negatively impacting the channel stability and reducing the ion permeability by 20.2% compared to the absence of fields. In this study, we simulate that terahertz waves in the mid-infrared frequency region can significantly alter the structure and function of potassium ion channels and that the effects of terahertz waves differ greatly based on frequency.
Collapse
Affiliation(s)
- Xiaofei Zhao
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Wen Ding
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Hongguang Wang
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Yize Wang
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Yanjiang Liu
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Yongdong Li
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Chunliang Liu
- Key Laboratory
for Physical
Electronics and Devices of the Ministry of Education, School of Electronic
and Information Engineering, Xi’an
Jiaotong University, Xi’an, Shaanxi 710049, China
| |
Collapse
|
2
|
Sehati M, Rafii-Tabar H, Sasanpour P. Computational modeling of the variation of the transmembrane potential of the endothelial cells of the blood-brain-barrier subject to an external electric field. Biomed Phys Eng Express 2023; 9:065009. [PMID: 37703844 DOI: 10.1088/2057-1976/acf937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 09/13/2023] [Indexed: 09/15/2023]
Abstract
The electromechanical properties of the membrane of endothelial cells forming the blood-brain barrier play a vital role in the function of this barrier. The mechanical effect exerted by external electric fields on the membrane could change its electrical properties. In this study the effect of extremely low frequency (ELF) external electric fields on the electrical activity of these cells has been studied by considering the mechanical effect of these fields on the capacitance of the membrane. The effect of time-dependent capacitance of the membrane is incorporated in the current components of the parallel conductance model for the electrical activity of the cells. The results show that the application of ELF electric fields induces hyperpolarization, having an indirect effect on the release of nitric oxide from the endothelial cell and the polymerization of actin filaments. Accordingly, this could play an important role in the permeability of the barrier. Our finding can have possible consequences in the field of drug delivery into the central nervous system.
Collapse
Affiliation(s)
- Mahboobe Sehati
- Department of Medical Physics and Biomedical Engineering, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hashem Rafii-Tabar
- Department of Medical Physics and Biomedical Engineering, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- The Physics Branch of the Academy of Sciences of Iran, Tehran, Iran
| | - Pezhman Sasanpour
- Department of Medical Physics and Biomedical Engineering, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| |
Collapse
|
3
|
Wang Y, Wang H, Ding W, Zhao X, Li Y, Liu C. Regulation of Ion Permeation of the KcsA Channel by Applied Midinfrared Field. Int J Mol Sci 2022; 24:ijms24010556. [PMID: 36613998 PMCID: PMC9820211 DOI: 10.3390/ijms24010556] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 12/30/2022] Open
Abstract
Ion transport molecules are involved in many physiological and pathological processes and are considered potential targets for cancer treatment. In the large family of ion transport molecules, potassium (K) ion channels, as surface-expressed proteins, show the highest variability and most frequent expression changes in many tumor types. The key to exploring the permeation of K+ through potassium channels lies in the conserved sequence TVGYG, which is common in the selectivity filter (SF) region of all potassium channels. We found that the K+ flux significantly increased with the help of a specific frequency terahertz electromagnetic wave (51.87 THz) in the KcsA channel using a molecular dynamics combined model through the combined simulation of the constant electric field method and ion imbalance method. This frequency has the strongest absorption peak in the infrared spectrum of -C=O groups in the SF region. With the applied electric field of 51.87 THz, the Y78 residue at the S1 site of the SF has a smaller vibration amplitude and a more stable structure, which enables the K+ to bind closely with the carbonyl oxygen atoms in the SF and realize ion conduction in a more efficient direct Coulomb knock-on.
Collapse
Affiliation(s)
- Yize Wang
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Hongguang Wang
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
- Correspondence: ; Tel.: +86-18191765263
| | - Wen Ding
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Xiaofei Zhao
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yongdong Li
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Chunliang Liu
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
- School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| |
Collapse
|
4
|
Li Y, Chang C, Zhu Z, Sun L, Fan C. Terahertz Wave Enhances Permeability of the Voltage-Gated Calcium Channel. J Am Chem Soc 2021; 143:4311-4318. [PMID: 33625851 DOI: 10.1021/jacs.0c09401] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A deficiency of Ca2+ fluxes arising from dysfunctional voltage-gated calcium channels has been associated with a list of calcium channelopathies such as epilepsy, hypokalemic periodic paralysis, episodic ataxia, etc. Apart from analyzing the pathogenic channel mutations, understanding how the channel regulates the ion conduction would be instructive to the treatment as well. In the present work, in relating the free energetics of Ca2+ transport to the calcium channel, we demonstrate the importance of bridging Ca2+ hydration waters, which form hydrogen bonds with channel -COO- and -C═O groups and enable a long-distance effect on the Ca2+ permeation. By firing a terahertz wave which resonates with the stretching mode of either the -COO- or the -C═O group, we obtain significantly enhanced selectivity and conductance of Ca2+. The Ca2+ free energy negatively grows nearly 5-fold. The direct evidence is the reinforced hydrogen bonds. In addition, thanks to forced vibrations, -COO- contributes to raised permeation as well even under a field in resonance with -C═O, and vice versa. Since the resonant terahertz field could manipulate the conduction of calcium channels, it has potential applications in therapeutic intervention such as rectifying a Ca2+ deficiency in degraded calcium channels, inducing apoptosis of tumor cells with overloaded calcium etc.
Collapse
Affiliation(s)
- Yangmei Li
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, People's Republic of China
| | - Chao Chang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, People's Republic of China.,Key Laboratory of Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Zhi Zhu
- School of Optical-Electrical Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
| | - Lan Sun
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, People's Republic of China
| | - Chunhai Fan
- School of Chemistry and Chemical Engineering, and Institute of Molecular Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| |
Collapse
|
5
|
Rahimi Z, Lohrasebi A. Influences of electric fields on the operation of Aqy1 aquaporin channels: a molecular dynamics study. Phys Chem Chem Phys 2020; 22:25859-25868. [PMID: 33155592 DOI: 10.1039/d0cp04763e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The dynamics of water molecules inside an Aquaporin channel, embedded within a stochastically fluctuating membrane, was modeled by means of the application of the molecular dynamics (MD) simulation method. We considered the effect of the existence and nonexistence of an external electric field, either constant or oscillating, on the stability of the channel. It was observed that the permeation of water molecules through the channel was increased when the channel was exposed to a constant electric field of strength -0.2 mV nm-1. Moreover, oscillating electric fields of 5 and 10 GHz frequencies, which is the range of field frequency generally present in our daily life, were applied to the channel, showing not significant effects on the stability of the channel and its important parts. In addition, we investigated the influence of the application of electric fields on the water molecule ordinations in the channels, and the results showed that the water molecule orientations were changed in response to the applied field.
Collapse
Affiliation(s)
- Z Rahimi
- Department of Physics, University of Isfahan, P.O. Box 81746-73441, Isfahan, Iran.
| | | |
Collapse
|
6
|
Adiban J, Jamali Y, Rafii-Tabar H. Simulation of the effect of an external GHz electric field on the potential energy profile of Ca2+
ions in the selectivity filter of the CaV
Ab channel. Proteins 2018; 86:414-422. [DOI: 10.1002/prot.25456] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 12/06/2017] [Accepted: 01/08/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Jamal Adiban
- Department of Medical Physics and Biomedical Engineering; School of Medicine, Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Yousef Jamali
- Department of Applied Mathematics; School of Mathematical Sciences, Tarbiat Modares University; Tehran Iran
- School of Nano-Science; Institute for Research in Fundamental Sciences (IPM); Tehran Iran
| | - Hashem Rafii-Tabar
- Department of Medical Physics and Biomedical Engineering; School of Medicine, Shahid Beheshti University of Medical Sciences; Tehran Iran
| |
Collapse
|
7
|
Fallah Z, Jamali Y, Rafii-Tabar H. Structural and Functional Effect of an Oscillating Electric Field on the Dopamine-D3 Receptor: A Molecular Dynamics Simulation Study. PLoS One 2016; 11:e0166412. [PMID: 27832207 PMCID: PMC5104473 DOI: 10.1371/journal.pone.0166412] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/29/2016] [Indexed: 01/02/2023] Open
Abstract
Dopamine as a neurotransmitter plays a critical role in the functioning of the central nervous system. The structure of D3 receptor as a member of class A G-protein coupled receptors (GPCRs) has been reported. We used MD simulation to investigate the effect of an oscillating electric field, with frequencies in the range 0.6–800 GHz applied along the z-direction, on the dopamine-D3R complex. The simulations showed that at some frequencies, the application of an external oscillating electric field along the z-direction has a considerable effect on the dopamine-D3R. However, there is no enough evidence for prediction of changes in specific frequency, implying that there is no order in changes. Computing the correlation coefficient parameter showed that increasing the field frequency can weaken the interaction between dopamine and D3R and may decrease the Arg128{3.50}-Glu324{6.30} distance. Because of high stability of α helices along the z-direction, applying an oscillating electric field in this direction with an amplitude 10-time higher did not have a considerable effect. However, applying the oscillating field at the frequency of 0.6 GHz along other directions, such as X-Y and Y-Z planes, could change the energy between the dopamine and the D3R, and the number of internal hydrogen bonds of the protein. This can be due to the effect of the direction of the electric field vis-à-vis the ligands orientation and the interaction of the oscillating electric field with the dipole moment of the protein.
Collapse
Affiliation(s)
- Zohreh Fallah
- School of Nano-Science, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
| | - Yousef Jamali
- School of Nano-Science, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
- Department of Mathematics, Tarbiat Modarres University, Tehran, Iran
| | - Hashem Rafii-Tabar
- Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Evin, Tehran, Iran
- * E-mail:
| |
Collapse
|