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Polovyi IO, Gnatyuk OP, Pyrshev KO, Hanulia TO, Doroshenko TP, Karakhim SA, Posudievsky OY, Kondratyuk AS, Koshechko VG, Dovbeshko GI. Dual effect of 2D WS 2 nanoparticles on the lysozyme conformation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2020; 1869:140556. [PMID: 33075478 DOI: 10.1016/j.bbapap.2020.140556] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 07/17/2020] [Accepted: 10/15/2020] [Indexed: 02/08/2023]
Abstract
In the present work we studied the effect of 2D WS2 nanoparticles on the conformational changes in lysozyme protein at different pH values (2.0-11.5). The contributions of various structural conformations (α-helix, β-sheets parallel and antiparallel, unordered structure and side groups) were determined by decomposition of Amid I absorbance bands. The 2D WS2 were shown to have different impact on secondary structure depending on pH of the solution and protein concentration. The amyloid fibril presence was confirmed with confocal microscopy enhanced by gold support, and fluorescent spectroscopy with amyloid-sensitive dye Thioflavin T. Our data show that WS2 can both inhibit and stimulate amyloid formation. Additionally, we have also reported an unusual spectroscopic behavior displayed by lysozyme, indicated by narrowing of Amide I and Amide II bands at pH 2.5 and 3.5 when incubated with 2D WS2 nanoparticles.
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Affiliation(s)
- I O Polovyi
- Institute of Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 46, Kyiv 03028, Ukraine.
| | - O P Gnatyuk
- Institute of Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 46, Kyiv 03028, Ukraine
| | - K O Pyrshev
- Institute of Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 46, Kyiv 03028, Ukraine; O.V. Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Leontovycha street, 9, Kyiv 01054, Ukraine
| | - T O Hanulia
- Institute of Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 46, Kyiv 03028, Ukraine; Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Okolna street, 2, Wroclaw 50-422, Poland
| | - T P Doroshenko
- V. Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 41, Kyiv 03028, Ukraine
| | - S A Karakhim
- O.V. Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Leontovycha street, 9, Kyiv 01054, Ukraine
| | - O Yu Posudievsky
- L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Nauky avenue, 31, Kyiv 03028, Ukraine
| | - A S Kondratyuk
- L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Nauky avenue, 31, Kyiv 03028, Ukraine
| | - V G Koshechko
- L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Nauky avenue, 31, Kyiv 03028, Ukraine
| | - G I Dovbeshko
- Institute of Physics of the National Academy of Sciences of Ukraine, Nauky avenue, 46, Kyiv 03028, Ukraine
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Charnley M, Gilbert J, Jones OG, Reynolds NP. Characterization of Amyloid Fibril Networks by Atomic Force Microscopy. Bio Protoc 2018; 8:e2732. [PMID: 34179261 PMCID: PMC8203930 DOI: 10.21769/bioprotoc.2732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 01/23/2018] [Accepted: 01/29/2018] [Indexed: 01/08/2023] Open
Abstract
Dense networks of amyloid nanofibrils fabricated from common globular proteins adsorbed to solid supports can improve cell adhesion, spreading and differentiation compared to traditional flat, stiff 2D cell culture substrates like Tissue Culture Polystyrene (TCPS). This is due to the fibrous, nanotopographic nature of the amyloid fibril networks and the fact that they closely mimic the mechanical properties and architecture of the extracellular matrix (ECM). However, precise cell responses are strongly dependent on the nanostructure of the network at the cell culture interface, thus accurate characterization of the immobilized network is important. Due to its exquisite lateral resolution and simple sample preparation techniques, Atomic Force Microscopy (AFM) is an ideal technique to characterize the fibril network morphology. Thus, here we describe a detailed protocol, for the characterization of amyloid fibril networks by tapping mode AFM.
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Affiliation(s)
- Mirren Charnley
- Centre for Micro-photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia
- Peter MacCallum Cancer Research Centre, Parkville, Melbourne, Victoria, Australia
| | - Jay Gilbert
- Department of Food Science, Purdue University, West Lafayette, USA
| | - Owen G. Jones
- Department of Food Science, Purdue University, West Lafayette, USA
| | - Nicholas P. Reynolds
- ARC Training Centre for Biodevices, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia
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