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Abramova A, Glagolev M, Vasilevskaya V. Structured globules with twisted arrangement of helical blocks: Computer simulation. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lazutin AA, Kosmachev AN, Vasilevskaya VV. Lamellae and parking garage structures in amphiphilic homopolymer brushes with different grafting densities. J Chem Phys 2019; 151:154903. [PMID: 31640361 DOI: 10.1063/1.5120383] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
This article is devoted to the study of polymer layers of amphiphilic homopolymers tightly grafted to a flat surface at the nodes of a square lattice. It was shown that, due to the amphiphilicity of monomer units containing groups with different affinities, in a selective solvent, such layers form lamellae perpendicular to the grafting surface. The period of the lamellae depends on the grafting density and the quality of the solvent. The results are presented in the form of a state diagram in variables "the energy of attraction of the side groups" (effective solvent quality) and "the distance between the grafting points" (inversely proportional to the square root of the grafting density). The diagram contains the regions of stability of lamellae with significantly different periods, and a transitional area with a parking garage structure. The diagram is constructed by calculating the layer-by-layer structure factor and the angle of inclination of the lamellae in the slice. The calculations were performed for different sizes of the simulation box, and the most commensurate size was determined by a special procedure for each grafting density. The results may be interesting not only to specialists in polymer science but also to all those who investigate the processes of self-organization and rearrangement in dense systems.
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Affiliation(s)
- Alexei A Lazutin
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova ul., 28, Moscow 119991, Russia
| | - Alexei N Kosmachev
- Faculty of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
| | - Valentina V Vasilevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova ul., 28, Moscow 119991, Russia
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Vasilevskaya VV, Govorun EN. Hollow and Vesicle Particles from Macromolecules with Amphiphilic Monomer Units. POLYM REV 2019. [DOI: 10.1080/15583724.2019.1599013] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Valentina V. Vasilevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Moscow, Russia
- Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow, Russia
| | - Elena N. Govorun
- Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow, Russia
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Glagolev MK, Vasilevskaya VV. Liquid-Crystalline Ordering of Filaments Formed by Bidisperse Amphiphilic Macromolecules. POLYMER SCIENCE SERIES C 2018. [DOI: 10.1134/s1811238218010046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Glagolev MK, Vasilevskaya VV, Khokhlov AR. Domains in mixtures of amphiphilic macromolecules with different stiffness of backbone. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.08.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Glagolev MK, Vasilevskaya VV, Khokhlov AR. Induced liquid-crystalline ordering in solutions of stiff and flexible amphiphilic macromolecules: Effect of mixture composition. J Chem Phys 2016; 145:044904. [PMID: 27475394 DOI: 10.1063/1.4959861] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Impact of mixture composition on self-organization in concentrated solutions of stiff helical and flexible macromolecules was studied by means of molecular dynamics simulation. The macromolecules were composed of identical amphiphilic monomer units but a fraction f of macromolecules had stiff helical backbones and the remaining chains were flexible. In poor solvents the compacted flexible macromolecules coexist with bundles or filament clusters from few intertwined stiff helical macromolecules. The increase of relative content f of helical macromolecules leads to increase of the length of helical clusters, to alignment of clusters with each other, and then to liquid-crystalline-like ordering along a single direction. The formation of filament clusters causes segregation of helical and flexible macromolecules and the alignment of the filaments induces effective liquid-like ordering of flexible macromolecules. A visual analysis and calculation of order parameter relaying the anisotropy of diffraction allow concluding that transition from disordered to liquid-crystalline state proceeds sharply at relatively low content of stiff components.
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Affiliation(s)
- Mikhail K Glagolev
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
| | - Valentina V Vasilevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
| | - Alexei R Khokhlov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
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Glagoleva AA, Vasilevskaya VV. Formation of a vesicle-like globule under steric restrictions. POLYMER SCIENCE SERIES A 2016. [DOI: 10.1134/s0965545x16020097] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Wang Q, Yu L, Sun Y. Grafting glycidyl methacrylate to Sepharose gel for fabricating high-capacity protein anion exchangers. J Chromatogr A 2016; 1443:118-25. [DOI: 10.1016/j.chroma.2016.03.033] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 03/14/2016] [Accepted: 03/14/2016] [Indexed: 12/20/2022]
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Lazutin AA, Govorun EN, Vasilevskaya VV, Khokhlov AR. New strategy to create ultra-thin surface layer of grafted amphiphilic macromolecules. J Chem Phys 2016; 142:184904. [PMID: 25978911 DOI: 10.1063/1.4920973] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
It was found first that macromolecules made of amphiphilic monomer units could form spontaneously an ultra-thin layer on the surface which the macromolecules are grafted to. The width of such layer is about double size of monomer unit consisting of hydrophilic A (repulsive) and hydrophobic (attractive) B beads. The hydrophilic A beads are connected in a polymer chain while hydrophobic B beads are attached to A beads of the backbone as side groups. Three characteristic regimes are distinguished. At low grafting density, the macromolecules form ultra-thin micelles of the shape changing with decrease of distance d between grafting points as following: circular micelles-prolonged micelles-inverse micelles-homogeneous bilayer. Those micelles have approximately constant height and specific top-down A-BB-A structure. At higher grafting density, the micelles start to appear above the single bilayer of amphiphilic macromolecules. The thickness of grafted layer in these cases is different in different regions of grafting surface. Only at rather high density of grafting, the height of macromolecular layer becomes uniform over the whole grafting surface. The study was performed by computer modeling experiments and confirmed in framework of analytical theory.
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Affiliation(s)
- A A Lazutin
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova ul. 28, Moscow 119991, Russia
| | - E N Govorun
- Faculty of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
| | - V V Vasilevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova ul. 28, Moscow 119991, Russia
| | - A R Khokhlov
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova ul. 28, Moscow 119991, Russia
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Glagolev MK, Vasilevskaya VV, Khokhlov AR. Effect of Induced Self-Organization in Mixtures of Amphiphilic Macromolecules with Different Stiffness. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00188] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mikhail K. Glagolev
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova str, 28, 119991, Moscow, Russia
| | | | - Alexei R. Khokhlov
- A. N. Nesmeyanov Institute of Organoelement Compounds RAS, Vavilova str, 28, 119991, Moscow, Russia
- Faculty
of Physics, M. V. Lomonosov Moscow State University, Leninskie
Gory, 119992, Moscow, Russia
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Glagoleva AA, Vasilevskaya VV, Yoshikawa K, Khokhlov AR. Self-assembly of an amphiphilic macromolecule under spherical confinement: An efficient route to generate hollow nanospheres. J Chem Phys 2013; 139:244901. [PMID: 24387390 DOI: 10.1063/1.4839795] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A A Glagoleva
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
| | - V V Vasilevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
| | - K Yoshikawa
- Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe 610-0394, Japan
| | - A R Khokhlov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
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Piwowar M, Banach M, Konieczny L, Roterman I. Hydrophobic core formation in protein complex of cathepsin. J Biomol Struct Dyn 2013; 32:1023-32. [PMID: 23826628 DOI: 10.1080/07391102.2013.801784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The "fuzzy oil drop" model assumes that the idealized hydrophobic core in a protein body can be described by a 3D Gauss function. The structure of the 1ICF protein (cathepsin), which participates in the proteolysis process and has cysteine-type peptidase activity, has been analyzed on the basis of the "fuzzy oil drop" model. The authors have determined the contribution of individual exon fragments to the creation of a common hydrophobic core and assessed the involvement of each chain in this process, depending on the number of complexed chains. Quantitative assessment of exons, chains, dimers, and the whole complex suggest that each of these units plays a different role in shaping the protein's hydrophobic core.
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Affiliation(s)
- Monika Piwowar
- a Department of Bioinformatics and Telemedicine , Medical College - Jagiellonian University , Lazarza 16 , 31-530 , Krakow , Poland
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