1
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Chen LH, Hu JN. Development of nano-delivery systems for loaded bioactive compounds: using molecular dynamics simulations. Crit Rev Food Sci Nutr 2024:1-22. [PMID: 38206576 DOI: 10.1080/10408398.2023.2301427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
Over the past decade, a remarkable surge in the development of functional nano-delivery systems loaded with bioactive compounds for healthcare has been witnessed. Notably, the demanding requirements of high solubility, prolonged circulation, high tissue penetration capability, and strong targeting ability of nanocarriers have posed interdisciplinary research challenges to the community. While extensive experimental studies have been conducted to understand the construction of nano-delivery systems and their metabolic behavior in vivo, less is known about these molecular mechanisms and kinetic pathways during their metabolic process in vivo, and lacking effective means for high-throughput screening. Molecular dynamics (MD) simulation techniques provide a reliable tool for investigating the design of nano-delivery carriers encapsulating these functional ingredients, elucidating the synthesis, translocation, and delivery of nanocarriers. This review introduces the basic MD principles, discusses how to apply MD simulation to design nanocarriers, evaluates the ability of nanocarriers to adhere to or cross gastrointestinal mucosa, and regulates plasma proteins in vivo. Moreover, we presented the critical role of MD simulation in developing delivery systems for precise nutrition and prospects for the future. This review aims to provide insights into the implications of MD simulation techniques for designing and optimizing nano-delivery systems in the healthcare food industry.
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Affiliation(s)
- Li-Hang Chen
- SKL of Marine Food Processing & Safety Control, National Engineering Research Center of Seafood, Collaborative Innovation Center of Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
| | - Jiang-Ning Hu
- SKL of Marine Food Processing & Safety Control, National Engineering Research Center of Seafood, Collaborative Innovation Center of Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
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2
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Song Y, Li Z, Tang R, Zhou K, Zhang L, Lin T, Fan J, Shi Z, Ma YQ. Size Control of On-Surface Self-Assembled Nanochains Using Soft Building Blocks. J Phys Chem Lett 2023; 14:11324-11332. [PMID: 38064362 DOI: 10.1021/acs.jpclett.3c02858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Owing to their conformational flexibility, soft molecules with side chains play a crucial role in molecular self-assembly or self-organization processes toward bottom-up building of supramolecular nanostructures. However, the influence of the rotating side chains in the confined space and subsequent surface-confined supramolecular self-assembly remains rarely explored. Herein, using the spatial confinement effect between soft building blocks, we realized size control on surface-confined supramolecular coordination self-assembly through the synergy between the repulsive steric hindrance and the attractive chemical interactions. Combining scanning tunneling microscopy with density functional theory calculations and Monte Carlo simulations, we elucidated the effective repulsive force generated by the thermal wiggling motions of the soft building blocks, allowing length tuning of the self-assembled chain structures. Through a delicate balance between the repulsive interaction induced by the spatial confinement effect and the coordinate chemical interaction, we provide a new strategy for controlling the geometry of the on-surface supramolecular nanostructures.
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Affiliation(s)
- Yang Song
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Zhanbo Li
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Rongyu Tang
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Kun Zhou
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Lizhi Zhang
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Tao Lin
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Jian Fan
- Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China
| | - Ziliang Shi
- Center for Soft Condensed Matter Physics & Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Yu-Qiang Ma
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
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3
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Kariuki M, Rho JY, Hall SCL, Perrier S. Investigating the Impact of Hydrophobic Polymer Segments on the Self-Assembly Behavior of Supramolecular Cyclic Peptide Systems via Asymmetric-Flow Field Flow Fractionation. Macromolecules 2023; 56:6618-6632. [PMID: 37720562 PMCID: PMC10501196 DOI: 10.1021/acs.macromol.3c00442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 08/08/2023] [Indexed: 09/19/2023]
Abstract
The present study examines the behavior of cyclic peptide polymer conjugates that have been designed to combine their self-assembling ability via H-bonding with the properties of amphiphilic diblock copolymers. Using a combination of asymmetric flow-field flow fractionation (AF4) and small-angle neutron scattering (SANS), we have uncovered unique insight based on the population of structures established at a 24 h equilibrium profile. Our results determine that by introducing a small quantity of hydrophobicity into the conjugated polymer corona, the resulting nanotube structures exhibit low unimer dissociation which signifies enhanced stability. Furthermore, as the hydrophobicity of the polymer corona is increased, the elongation of the nanotubes is observed due to an increase in the association of unimers. This encompasses not only the H-bonding of unimers into nanotubes but also the self-assembly of single nanotubes into segmented-nanotube structures with high aspect ratios. However, this influence relies on a subtle balance between the hydrophobicity and hydrophilicity of the polymer corona. This balance is proposed to determine the solvent entropic penalty of hydrating the system, whereby the cost scales with the hydrophobic quantity. Consequently, it has been suggested that at a critical hydrophobic quantity, the solvation penalty becomes high enough such that the self-assembly of the system deviates from ordered hydrogen bonding. The association behavior is instead dominated by the hydrophobic effect which results in the undesirable formation of disordered aggregates.
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Affiliation(s)
- Maria Kariuki
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | - Julia Y. Rho
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | - Stephen C. L. Hall
- ISIS
Neutron and Muon Source, Rutherford Appleton
Laboratory, Didcot OX11 0QX, U.K.
| | - Sébastien Perrier
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
- Warwick
Medical School, University of Warwick, Coventry CV4 7AL, U.K.
- Faculty
of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
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4
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Gruschwitz FV, Fu MC, Klein T, Takahashi R, Higashihara T, Hoeppener S, Nischang I, Sakurai K, Brendel JC. Unraveling Decisive Structural Parameters for the Self-Assembly of Supramolecular Polymer Bottlebrushes Based on Benzene Trisureas. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01361] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Franka V. Gruschwitz
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
| | - Mao-Chun Fu
- Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Tobias Klein
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
| | - Rintaro Takahashi
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
| | - Tomoya Higashihara
- Department of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Stephanie Hoeppener
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
| | - Ivo Nischang
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
| | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
| | - Johannes C. Brendel
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany
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5
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Lee H. Molecular Simulations of PEGylated Biomolecules, Liposomes, and Nanoparticles for Drug Delivery Applications. Pharmaceutics 2020; 12:E533. [PMID: 32531886 PMCID: PMC7355693 DOI: 10.3390/pharmaceutics12060533] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 06/04/2020] [Accepted: 06/08/2020] [Indexed: 12/17/2022] Open
Abstract
Since the first polyethylene glycol (PEG)ylated protein was approved by the FDA in 1990, PEGylation has been successfully applied to develop drug delivery systems through experiments, but these experimental results are not always easy to interpret at the atomic level because of the limited resolution of experimental techniques. To determine the optimal size, structure, and density of PEG for drug delivery, the structure and dynamics of PEGylated drug carriers need to be understood close to the atomic scale, as can be done using molecular dynamics simulations, assuming that these simulations can be validated by successful comparisons to experiments. Starting with the development of all-atom and coarse-grained PEG models in 1990s, PEGylated drug carriers have been widely simulated. In particular, recent advances in computer performance and simulation methodologies have allowed for molecular simulations of large complexes of PEGylated drug carriers interacting with other molecules such as anticancer drugs, plasma proteins, membranes, and receptors, which makes it possible to interpret experimental observations at a nearly atomistic resolution, as well as help in the rational design of drug delivery systems for applications in nanomedicine. Here, simulation studies on the following PEGylated drug topics will be reviewed: proteins and peptides, liposomes, and nanoparticles such as dendrimers and carbon nanotubes.
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Affiliation(s)
- Hwankyu Lee
- Department of Chemical Engineering, Dankook University, Yongin 16890, Korea
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6
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Sousa SF, Peres J, Coelho M, Vieira TF. Analyzing PEGylation through Molecular Dynamics Simulations. ChemistrySelect 2018. [DOI: 10.1002/slct.201800855] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sérgio F. Sousa
- UCIBIO@REQUIMTE; BioSIM; Departamento de Biomedicina; Faculdade de Medicina da Universidade do Porto, Alameda Professor Hernâni Monteiro; 4200-319, Porto Portugal
| | - Joana Peres
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
| | - Manuel Coelho
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
| | - Tatiana F. Vieira
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
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7
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Mansfield EDH, Hartlieb M, Catrouillet S, Rho JY, Larnaudie SC, Rogers SE, Sanchis J, Brendel JC, Perrier S. Systematic study of the structural parameters affecting the self-assembly of cyclic peptide-poly(ethylene glycol) conjugates. SOFT MATTER 2018; 14:6320-6326. [PMID: 30019044 DOI: 10.1039/c8sm01133h] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Self-assembling cyclic peptides (CP) consisting of amino acids with alternating d- and l-chirality form nanotubes by hydrogen bonding, hydrophobic interactions, and π-π stacking in solution. These highly dynamic materials are emerging as promising supramolecular systems for a wide range of biomedical applications. Herein, we discuss how varying the polymer conformation (linear vs. brush), as well as the number of polymer arms per peptide unimer affects the self-assembly of PEGylated cyclic peptides in different solvents, using small angle neutron scattering. Using the derived information, strong correlations were drawn between the size of the aggregates, solvent polarity, and its ability to compete for hydrogen bonding interactions between the peptide unimers. Using these data, it could be possible to engineer cyclic peptide nanotubes of a controlled length.
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Affiliation(s)
- Edward D H Mansfield
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
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8
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Lampel A, Ulijn RV, Tuttle T. Guiding principles for peptide nanotechnology through directed discovery. Chem Soc Rev 2018; 47:3737-3758. [PMID: 29748676 DOI: 10.1039/c8cs00177d] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Life's diverse molecular functions are largely based on only a small number of highly conserved building blocks - the twenty canonical amino acids. These building blocks are chemically simple, but when they are organized in three-dimensional structures of tremendous complexity, new properties emerge. This review explores recent efforts in the directed discovery of functional nanoscale systems and materials based on these same amino acids, but that are not guided by copying or editing biological systems. The review summarises insights obtained using three complementary approaches of searching the sequence space to explore sequence-structure relationships for assembly, reactivity and complexation, namely: (i) strategic editing of short peptide sequences; (ii) computational approaches to predicting and comparing assembly behaviours; (iii) dynamic peptide libraries that explore the free energy landscape. These approaches give rise to guiding principles on controlling order/disorder, complexation and reactivity by peptide sequence design.
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Affiliation(s)
- A Lampel
- Advanced Science Research Center (ASRC) at the Graduate Center, City University of New York (CUNY), New York, NY, USA.
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9
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Benjamin A, Keten S. Polymer Conjugation as a Strategy for Long-Range Order in Supramolecular Polymers. J Phys Chem B 2016; 120:3425-33. [DOI: 10.1021/acs.jpcb.5b12547] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ari Benjamin
- Department
of Mechanical
Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
| | - Sinan Keten
- Department
of Mechanical
Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
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10
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DeBenedictis EP, Hamed E, Keten S. Mechanical Reinforcement of Proteins with Polymer Conjugation. ACS NANO 2016; 10:2259-2267. [PMID: 26687555 DOI: 10.1021/acsnano.5b06917] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Conjugating poly(ethylene glycol) (PEG) to peptides, also known as PEGylation, is proven to increase the thermodynamical stability of peptides, and has been successfully applied to prolong the lifetime of peptide-based vaccines and therapeutic agents. While it is known that protein structure and function can be altered by mechanical stress, whether PEGylation can reinforce proteins against mechanical unfolding remains to be ascertained. Here, we illustrate that PEGylation prolongs the lifetime of α-helices subject to constant stress. PEGylation is found to increase the unfolding time through two mechanisms. We see that (1) the unfolding rate of a helical segment is decreased through prolonged plateau regimes where the peptide helical content remains constant, and (2) the proportion of refolding to unfolding is increased, primarily by shielding water molecules from replacing forcibly exposed backbone hydrogen bonds near the conjugation site. Our findings demonstrate the feasibility of improving peptide mechanical stability with polymer conjugation. This provides a basis for future studies on optimizing conjugation location and chemistry to build custom biomolecules with unforeseen mechanical functions and stability.
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Affiliation(s)
- Elizabeth P DeBenedictis
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Elham Hamed
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Sinan Keten
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
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11
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Carmichael SP, Shell MS. Entropic (de)stabilization of surface-bound peptides conjugated with polymers. J Chem Phys 2015; 143:243103. [DOI: 10.1063/1.4929592] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Scott P. Carmichael
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA
| | - M. Scott Shell
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA
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12
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Sinko R, Keten S. Understanding emergent functions in self-assembled fibrous networks. NANOTECHNOLOGY 2015; 26:352501. [PMID: 26267869 DOI: 10.1088/0957-4484/26/35/352501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Understanding self-assembly processes of nanoscale building blocks and characterizing their properties are both imperative for designing new hierarchical, network materials for a wide range of structural, optoelectrical, and transport applications. Although the characterization and choices of these material building blocks have been well studied, our understanding of how to precisely program a specific morphology through self-assembly still must be significantly advanced. In the recent study by Xie et al (2015 Nanotechnology 26 205602), the self-assembly of end-functionalized nanofibres is investigated using a coarse-grained molecular model and offers fundamental insight into how to control the structural morphology of nanofibrous networks. Varying nanoscale networks are observed when the molecular interaction strength is changed and the findings suggest that self-assembly through the tuning of molecular interactions is a key strategy for designing nanostructured networks with specific topologies.
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13
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Hierarchical cascades of instability govern the mechanics of coiled coils: helix unfolding precedes coil unzipping. Biophys J 2015; 107:477-484. [PMID: 25028889 DOI: 10.1016/j.bpj.2014.06.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/13/2014] [Accepted: 06/03/2014] [Indexed: 12/31/2022] Open
Abstract
Coiled coils are a fundamental emergent motif in proteins found in structural biomaterials, consisting of α-helical secondary structures wrapped in a supercoil. A fundamental question regarding the thermal and mechanical stability of coiled coils in extreme environments is the sequence of events leading to the disassembly of individual oligomers from the universal coiled-coil motifs. To shed light on this phenomenon, here we report atomistic simulations of a trimeric coiled coil in an explicit water solvent and investigate the mechanisms underlying helix unfolding and coil unzipping in the assembly. We employ advanced sampling techniques involving steered molecular dynamics and metadynamics simulations to obtain the free-energy landscapes of single-strand unfolding and unzipping in a three-stranded assembly. Our comparative analysis of the free-energy landscapes of instability pathways shows that coil unzipping is a sequential process involving multiple intermediates. At each intermediate state, one heptad repeat of the coiled coil first unfolds and then unzips due to the loss of contacts with the hydrophobic core. This observation suggests that helix unfolding facilitates the initiation of coiled-coil disassembly, which is confirmed by our 2D metadynamics simulations showing that unzipping of one strand requires less energy in the unfolded state compared with the folded state. Our results explain recent experimental findings and lay the groundwork for studying the hierarchical molecular mechanisms that underpin the thermomechanical stability/instability of coiled coils and similar protein assemblies.
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14
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Catrouillet S, Bouteiller L, Nicol E, Nicolai T, Pensec S, Jacquette B, Le Bohec M, Colombani O. Self-Assembly and Critical Solubility Temperature of Supramolecular Polystyrene Bottle-Brushes in Cyclohexane. Macromolecules 2015. [DOI: 10.1021/ma5024022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sylvain Catrouillet
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Laurent Bouteiller
- UMR
8232, IPCM, Chimie des Polymères, Sorbonne Université, UPMC Université Paris 06, F-75005 Paris, France
- UMR
8232, IPCM, Chimie des Polymères, CNRS, 75005 Paris, France
| | - Erwan Nicol
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Taco Nicolai
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Sandrine Pensec
- UMR
8232, IPCM, Chimie des Polymères, Sorbonne Université, UPMC Université Paris 06, F-75005 Paris, France
- UMR
8232, IPCM, Chimie des Polymères, CNRS, 75005 Paris, France
| | - Boris Jacquette
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Maël Le Bohec
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Olivier Colombani
- IMMM−UMR
CNRS 6283, LUNAM Université, Université du Maine, av. O. Messiaen, 72085 Le Mans Cedex 9, France
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15
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Hamed E, Ma D, Keten S. Multiple PEG Chains Attached onto the Surface of a Helix Bundle: Conformations and Implications. ACS Biomater Sci Eng 2015. [DOI: 10.1021/ab500088b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Elham Hamed
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Dan Ma
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Sinan Keten
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
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16
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Woo SY, Lee H. Molecular dynamics studies of PEGylated α-helical coiled coils and their self-assembled micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8848-8855. [PMID: 25000284 DOI: 10.1021/la501973w] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We performed coarse-grained (CG) molecular dynamics simulations of trimeric α-helical coiled coils grafted with poly(ethylene glycol) (PEG) of different sizes and conjugate positions and the self-assembled micelle of amphiphilic trimers. The CG model for the trimeric coiled coil is verified by comparing the α-helical structure and interhelical distance with those calculated from all-atom simulations. In CG simulations of PEGylated trimers, the end-to-end distances and radii of gyration of PEGs grafted to the sides of peptides become shorter than those of free PEGs in water, which agrees with experiments. This shorter size of the grafted PEGs is also confirmed by calculating the thickness of the PEG layer, which is less than the size of the mushroom. These indicate the adsorption of PEG chains onto coiled coils since hydrophobic residues in the exterior sites of coiled coils tend to be less exposed to water and thus interact with PEGs, leading to the compact conformation of adsorbed PEGs. Simulations of the self-assembly of amphiphilic trimers show that the randomly distributed trimers self-assemble to micelles. The outer radius and hydrodynamic radius of the micelle, which were calculated respectively from radial densities and diffusion coefficients, are ∼7 nm, in agreement with the experimental value of ∼7.5 nm, while the aggregation number of amphiphilic molecules per micelle is lower than the experimentally proposed value. These simulations predict the experimentally measured size of PEGs grafted to the trimeric coiled coils and their self-assembled amphiphilic micelles and suggest that the aggregation number of the micelle may be lower, which needs to be confirmed by experiments.
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Affiliation(s)
- Sun Young Woo
- Department of Chemical Engineering, Dankook University , Yongin 448-701, South Korea
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17
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Ruiz L, Keten S. Thermodynamics versus Kinetics Dichotomy in the Linear Self-Assembly of Mixed Nanoblocks. J Phys Chem Lett 2014; 5:2021-2026. [PMID: 26273889 DOI: 10.1021/jz500776g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report classical and replica exchange molecular dynamics simulations that establish the mechanisms underpinning the growth kinetics of a binary mix of nanorings that form striped nanotubes via self-assembly. A step-growth coalescence model captures the growth process of the nanotubes, which suggests that high aspect ratio nanostructures can grow by obeying the universal laws of self-similar coarsening, contrary to systems that grow through nucleation and elongation. Notably, striped patterns do not depend on specific growth mechanisms, but are governed by tempering conditions that control the likelihood of depropagation and fragmentation.
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18
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Molecular Modeling of PEGylated Peptides, Dendrimers, and Single-Walled Carbon Nanotubes for Biomedical Applications. Polymers (Basel) 2014. [DOI: 10.3390/polym6030776] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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