Impact of Ultrafast Electric Field Changes on Photoreceptor Protein Dynamics

Electric-field effects on the interfacial electron transfer and protein dynamics of cytochrome c

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2010.12.020 ◽

2011 ◽

Vol 660 (2) ◽

pp. 367-376 ◽

Cited By ~ 33

Author(s):

H. Khoa Ly ◽

Nattawadee Wisitruangsakul ◽

Murat Sezer ◽

Jiu-Ju Feng ◽

Anja Kranich ◽

...

Keyword(s):

Electron Transfer ◽

Cytochrome C ◽

Electric Field ◽

Protein Dynamics ◽

Interfacial Electron Transfer ◽

Electric Field Effects ◽

Field Effects

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Dynamics of Solid Proteins by Means of Nuclear Magnetic Resonance Relaxometry

Biomolecules ◽

10.3390/biom9110652 ◽

2019 ◽

Vol 9 (11) ◽

pp. 652 ◽

Cited By ~ 8

Author(s):

Danuta Kruk ◽

Elzbieta Masiewicz ◽

Anna M. Borkowska ◽

Pawel Rochowski ◽

Pascal H. Fries ◽

...

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Electric Field ◽

Electric Field Gradient ◽

Field Gradient ◽

Protein Dynamics ◽

Spin Lattice Relaxation ◽

Closed Form Expression ◽

Quadrupole Relaxation ◽

Nuclear Magnetic

1H Nuclear magnetic resonance (NMR) relaxometry was exploited to investigate the dynamics of solid proteins. The relaxation experiments were performed at 37 °C over a broad frequency range, from approximately 10 kHz to 40 MHz. Two relaxation contributions to the overall 1H spin–lattice relaxation were revealed; they were associated with 1H–1H and 1H–14N magnetic dipole–dipole interactions, respectively. The 1H–1H relaxation contribution was interpreted in terms of three dynamical processes occurring on timescales of 10−6 s, 10−7 s, and 10−8 s, respectively. The 1H–14N relaxation contribution shows quadrupole relaxation enhancement effects. A thorough analysis of the data was performed revealing similarities in the protein dynamics, despite their different structures. Among several parameters characterizing the protein dynamics and structure (e.g., electric field gradient tensor at the position of 14N nuclei), the orientation of the 1H–14N dipole–dipole axis, with respect to the principal axis system of the electric field gradient, was determined, showing that, for lysozyme, it was considerably different than for the other proteins. Moreover, the validity range of a closed form expression describing the 1H–14N relaxation contribution was determined by a comparison with a general approach based on the stochastic Liouville equation.

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Stochastic Modeling of External Electric Field Effect on Escherichia Coli Min Protein Dynamics

Journal of the Korean Physical Society ◽

10.3938/jkps.53.851 ◽

2008 ◽

Vol 53 (2) ◽

pp. 851-862 ◽

Cited By ~ 1

Author(s):

Charin Modchang ◽

Wannapong Triampo ◽

Paisan Kanthang ◽

Udorn Junthorn ◽

Somrit Unai ◽

...

Keyword(s):

Escherichia Coli ◽

Electric Field ◽

Protein Dynamics ◽

External Electric Field ◽

Stochastic Modeling ◽

Field Effect ◽

Electric Field Effect ◽

External Electric Field Effect

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EF-X in Silico - Modeling Protein Dynamics in an Electric Field

Biophysical Journal ◽

10.1016/j.bpj.2019.11.2778 ◽

2020 ◽

Vol 118 (3) ◽

pp. 504a

Author(s):

Eugene Klyshko ◽

Lauren McGough ◽

Justin S. Kim ◽

Rama Ranganathan ◽

Sarah Rauscher

Keyword(s):

Electric Field ◽

Protein Dynamics ◽

In Silico ◽

In Silico Modeling

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Direct Observation of the Gating Step in Protein Electron Transfer: Electric-Field-Controlled Protein Dynamics

Journal of the American Chemical Society ◽

10.1021/ja8016895 ◽

2008 ◽

Vol 130 (30) ◽

pp. 9844-9848 ◽

Cited By ~ 70

Author(s):

Anja Kranich ◽

Hoang Khoa Ly ◽

Peter Hildebrandt ◽

Daniel H. Murgida

Keyword(s):

Electron Transfer ◽

Electric Field ◽

Protein Dynamics ◽

Direct Observation ◽

Protein Electron Transfer

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Resolution in photoelectron microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100086593 ◽

1991 ◽

Vol 49 ◽

pp. 458-459

Author(s):

G. F. Rempfer

Keyword(s):

Electron Microscopy ◽

Electric Field ◽

Ultraviolet Light ◽

Uniform Field ◽

Virtual Image ◽

Lens System ◽

Photoemission Electron Microscopy ◽

Planar Electrode ◽

Electron Lens ◽

Photoemission Electron

In photoelectron microscopy (PEM), also called photoemission electron microscopy (PEEM), the image is formed by electrons which have been liberated from the specimen by ultraviolet light. The electrons are accelerated by an electric field before being imaged by an electron lens system. The specimen is supported on a planar electrode (or the electrode itself may be the specimen), and the accelerating field is applied between the specimen, which serves as the cathode, and an anode. The accelerating field is essentially uniform except for microfields near the surface of the specimen and a diverging field near the anode aperture. The uniform field forms a virtual image of the specimen (virtual specimen) at unit lateral magnification, approximately twice as far from the anode as is the specimen. The diverging field at the anode aperture in turn forms a virtual image of the virtual specimen at magnification 2/3, at a distance from the anode of 4/3 the specimen distance. This demagnified virtual image is the object for the objective stage of the lens system.

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Field-assisted ionization theory for microscopists

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100171833 ◽

1994 ◽

Vol 52 ◽

pp. 820-821

Author(s):

Patrick P. Camus

Keyword(s):

Electric Field ◽

Electron Tunneling ◽

Ionization Probability ◽

Critical Distance ◽

Tunneling Probability ◽

Field Ionization ◽

Radius Of Curvature ◽

Field Evaporation ◽

A Value ◽

Ion Emission

The theory of field ion emission is the study of electron tunneling probability enhanced by the application of a high electric field. At subnanometer distances and kilovolt potentials, the probability of tunneling of electrons increases markedly. Field ionization of gas atoms produce atomic resolution images of the surface of the specimen, while field evaporation of surface atoms sections the specimen. Details of emission theory may be found in monographs.Field ionization (FI) is the phenomena whereby an electric field assists in the ionization of gas atoms via tunneling. The tunneling probability is a maximum at a critical distance above the surface,xc, Fig. 1. Energy is required to ionize the gas atom at xc, I, but at a value reduced by the appliedelectric field, xcFe, while energy is recovered by placing the electron in the specimen, φ. The highest ionization probability occurs for those regions on the specimen that have the highest local electric field. Those atoms which protrude from the average surfacehave the smallest radius of curvature, the highest field and therefore produce the highest ionizationprobability and brightest spots on the imaging screen, Fig. 2. This technique is called field ion microscopy (FIM).

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