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Felsztyna I, Perillo MA, Clop EM. Nanoarchitectonic approaches for measuring the catalytic behavior of a membrane anchored enzyme. From Langmuir-Blodgett to a novel Langmuir-Schaefer based nanofilm building device. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2023; 1865:184177. [PMID: 37225031 DOI: 10.1016/j.bbamem.2023.184177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/22/2023] [Accepted: 05/15/2023] [Indexed: 05/26/2023]
Abstract
Self-organized lipid monolayers at the air-water interface (Langmuir films, LF) are commonly used for measuring the catalytic properties of membrane-bound enzymes. This methodology allows to provide a consistent flat topography molecular density, packing defects and thickness. The aim of the present work was to show the methodological advantages of using the horizontal transfer method (Langmuir-Schaefer) with respect to the vertical transfer method (Langmuir-Blodgett) when mounting a device to measure catalytic activity of membrane enzymes. Based on the results obtained we can conclude that it is possible to prepare stable Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) films from Bovine Erythrocyte Membranes (BEM) preserving the catalytic activity of its native Acetylcholinesterase (BEA). In comparison, the LS films showed Vmax values more similar to the enzyme present in the vesicles of natural membranes. In addition, it was much easier to produce large amounts of transferred areas with the horizontal transfer methodology. It was possible to decrease the time required to mount an assay with numerous activity points, such as building activity curves as a function of substrate concentration. The present results show that LSBEM provides a proof of concept for the development of biosensors based on transferred purified membrane for the screening of new products acting on an enzyme embedded on its natural milieu. In the case of BEA, the application of these enzymatic sensors could have medical interest, providing drug screening tools for the treatment of Alzheimer's disease.
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Affiliation(s)
- Iván Felsztyna
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
| | - María A Perillo
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
| | - Eduardo M Clop
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Departamento de Química, Cátedra de Química Biológica, Córdoba, Argentina; CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina.
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Zhou F, Xue Q, Duan X. A novel ultrasonic-electric-based microsystem for the investigation of mechanical aging on lipid membranes. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2023; 2023:1-4. [PMID: 38083663 DOI: 10.1109/embc40787.2023.10340884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Aging cells experience a gradual degeneration of their chemical and physical characteristics, resulting in the declining body functions that are commonly observed in old age. In this paper, we propose a novel microsystem that utilizes acoustics and electricity to investigate the effects of mechanical cyclic loading on cellular aging. Our study is the first to examine how mechanical loading influences the physicochemical characteristics of lipid bilayer at the subcellular level. By providing a new method for understanding the mechanism of cellular aging and aging-related diseases, our microsystem has significant implications for the development of treatments and therapies.Clinical Relevance- This ultrasonic-electric-based microsystem, as an in vitro model with sensitive quantitative capabilities, could have significant clinical implications in terms of understanding cellular responses to mechanical forces, elucidating the pathogenesis of aging-related diseases, and developing therapeutic strategies.
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Jemmett P, Milan DC, Nichols RJ, Howitt T, Martin AL, Arnold T, Rawle JL, Nicklin CL, Dafforn TR, Cox LR, Horswell SL. Influence of the Lipid Backbone on Electrochemical Phase Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14290-14301. [PMID: 36354380 PMCID: PMC9686133 DOI: 10.1021/acs.langmuir.2c02370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Sphingolipids are an important class of lipids found in mammalian cell membranes with important structural and signaling roles. They differ from another major group of lipids, the glycerophospholipids, in the connection of their hydrocarbon chains to their headgroups. In this study, a combination of electrochemical and structural methods has been used to elucidate the effect of this difference on sphingolipid behavior in an applied electric field. N-Palmitoyl sphingomyelin forms bilayers of similar coverage and thickness to its close analogue di-palmitoyl phosphatidylcholine. Grazing incidence diffraction data show slightly closer packing and a smaller chain tilt angle from the surface normal. Electrochemical IR results at low charge density show that the difference in tilt angle is retained on deposition to form bilayers. The bilayers respond differently to increasing electric field strength: chain tilt angles increase for both molecules, but sphingomyelin chains remain tilted as field strength is further increased. This behavior is correlated with disruption of the hydrogen-bonding network of small groups of sphingomyelin molecules, which may have significance for the behavior of molecules in lipid rafts in the presence of strong fields induced by ion gradients or asymmetric distribution of charged lipids.
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Affiliation(s)
- Philip
N. Jemmett
- School
of Chemistry, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
| | - David C. Milan
- Department
of Chemistry, University of Liverpool, Crown Street, LiverpoolL69 7ZD, UK
| | - Richard J. Nichols
- Department
of Chemistry, University of Liverpool, Crown Street, LiverpoolL69 7ZD, UK
| | - Thomas Howitt
- School
of Chemistry, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
| | - Alexandra L. Martin
- School
of Chemistry, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
| | - Thomas Arnold
- Diamond
Light Source, Harwell Science and Innovation Campus, Chilton, Didcot, OxfordshireOX11
0DE, UK
- European
Spallation Source ERICPO Box 176, LundSE-221
00, Sweden
- ISIS
Pulsed Neutron and Muon Source, Science and Technology Facilities
Council, Rutherford Appleton Laboratory, Harwell, OxfordshireOX11 0QX, UK
- Department
of Chemistry, University of Bath, Claverton Down, BathBA2 7AY, UK
| | - Jonathan L. Rawle
- Diamond
Light Source, Harwell Science and Innovation Campus, Chilton, Didcot, OxfordshireOX11
0DE, UK
| | - Christopher L. Nicklin
- Diamond
Light Source, Harwell Science and Innovation Campus, Chilton, Didcot, OxfordshireOX11
0DE, UK
| | - Timothy R. Dafforn
- School
of Biosciences, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
| | - Liam R. Cox
- School
of Chemistry, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
| | - Sarah L. Horswell
- School
of Chemistry, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK
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Paul R, Banik H, Alzaid M, Bhattacharjee D, Hussain SA. Interaction of a Phospholipid and a Coagulating Protein: Potential Candidate for Bioelectronic Applications. ACS OMEGA 2022; 7:17583-17592. [PMID: 35664573 PMCID: PMC9161252 DOI: 10.1021/acsomega.1c07395] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 04/15/2022] [Indexed: 05/31/2023]
Abstract
In the present communication, we have investigated the interaction between a biomembrane component 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and a coagulating protein protamine sulfate (PS) using the Langmuir-Blodgett (LB) technique. The π-A isotherm, π-t characteristics, and analysis of isotherm curves suggested that PS strongly interacted with DOPC, affecting the fluidity of the DOPC layer. Electrical characterization indicates that PS as well as the PS-DOPC film showed resistive switching behavior suitable for Write Once Read Many (WORM) memory application. Trap-controlled space charge-limited conduction (SCLC) was the key mechanism behind such observed switching. The presence of DOPC affected the SCLC process, leading to lowering of threshold voltage (V Th), which is advantageous in terms of lower power consumption.
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Affiliation(s)
- Ripa Paul
- Thin
Film and Nanoscience Laboratory, Department of Physics, Tripura University, Suryamaninagar 799022, Tripura, India
| | - Hritinava Banik
- Thin
Film and Nanoscience Laboratory, Department of Physics, Tripura University, Suryamaninagar 799022, Tripura, India
| | - Meshal Alzaid
- Physics
Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Al-Jouf 75471, Saudi Arabia
| | - Debajyoti Bhattacharjee
- Thin
Film and Nanoscience Laboratory, Department of Physics, Tripura University, Suryamaninagar 799022, Tripura, India
| | - Syed Arshad Hussain
- Thin
Film and Nanoscience Laboratory, Department of Physics, Tripura University, Suryamaninagar 799022, Tripura, India
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