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Self-Emulsifying Micellization of Crude Extracts from Apple (Malus domestica cv. Anna), Plum ( Prunus domestica cv. Satsuma), and Guava ( Psidium guajava L.) Fruits. Molecules 2023; 28:molecules28031297. [PMID: 36770962 PMCID: PMC9921913 DOI: 10.3390/molecules28031297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/13/2023] [Accepted: 01/20/2023] [Indexed: 01/31/2023] Open
Abstract
Micellar microemulsions are thermodynamically stable self-emulsifying systems that have been used to successfully improve the low oral bioavailability of several bioactive phytochemicals, such as antioxidant polyphenols. However, most studies have reported the micellization of single-compounds or purified chemical fractions; thus, the stability, phytochemical-loading efficiency, and bioactivity of complex crude extracts remain largely unexplored. In this study, we evaluated the effects of micellar emulsification of tropical apple (Malus domestica cv. Anna), plum (Prunus domestica cv. Satsuma), and guava (Psidium guajava L.) extracts regarding particle size and stability, polyphenol-loading efficiency, antioxidant capacity, and cytotoxic activity in human and murine cells. Simple food-grade extraction protocols were implemented to obtain apple, plum, and guava extracts. Total polyphenols, flavonoids, and antioxidant activity (DPPH) were determined in the fruit extracts, and their polyphenol profile was further characterized by liquid chromatography (HPLC-DAD). The dried extracts were mixed into a food-grade, self-emulsifying system, and their cytotoxicity in human and murine cell lines was compared. Our research showed that complex fruit matrixes were successfully emulsified into thermodynamically stable polysorbate-based nanometric micelles with uniform size distribution and consistent pH stability, with potential applications in food and biomedical industries.
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Study on the Mechanism of the Reversible Color Change of Polyacrylic Acid Modified Gold Nanoparticles Responding to pH. MATERIALS 2021; 14:ma14133679. [PMID: 34279250 PMCID: PMC8269886 DOI: 10.3390/ma14133679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/06/2021] [Accepted: 06/24/2021] [Indexed: 11/29/2022]
Abstract
In view of various explanations regarding the pH response of the nanocomposite of gold nanoparticles (AuNPs) modified with polyacrylic acid (PAA) molecules in reported literature, in this work, AuNPs with a size of 20 nm saturatedly loaded with PAA molecules (AuNPs-PAAs) were used to investigate the following aspects of this issue. We investigated the effects of pH on the stability of AuNPs-PAAs in the presence of salt, CTAB, poly (sodium styrenesulfonate) (PSS), ethanol, and free PAA, respectively. Common techniques were undertaken to evaluate the stability, including UV-Vis spectroscopy, Zeta potential analysis, and TEM. The results show that AuNPs-PAAs could respond to pH variations, having a reversible aggregation-to-disaggregation, accompanying their Zeta potential change. The proposed corresponding mechanism was that this reversible change was attributes to the net charge variation of AuNPs-PAAs induced by a reversible protonation-to-deprotonation of PAA rather than the conformational change. It was found that salt, CTAB, PSS, and free PAA could strengthen the dispersity of AuNPs-PAAs, even though their absolute Zeta potential values were decreased to small values or dropped to nearly zero. This abnormal phenomenon was explained by solvation. It was also found that AuNPs-PAAs have an opposite pH response in aqueous and ethanol solutions, justifying the solvation effect. All these results revealed the conformational stability of PAAs immobilized on AuNPs. The methods and the findings of this investigation give some new insights to understand the pH-response of AuNPs-PAAs composites and the design of AuNPs-PAAs-based functional sensors.
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Zhang L, Quan C, Zhang X, Xiong W, Fan S. Proteoliposome-based model for screening inhibitors targeting histidine kinase AgrC. Chem Biol Drug Des 2019; 93:712-723. [PMID: 30737896 DOI: 10.1111/cbdd.13497] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 01/18/2019] [Accepted: 01/26/2019] [Indexed: 11/29/2022]
Abstract
AgrC, as an integral membrane receptor protein with histidine kinase activity, is an important component of the agr quorum-sensing system of Staphylococcus aureus. AgrC acts as a sensor for the recognition of environmental signals and transduction of the signals into the cytoplasm. Therefore, AgrC is considered to be a compelling target for the development of novel quorum-sensing inhibitors. Here, we constructed a proteoliposome-based model for screening inhibitors targeting AgrC by incorporating AgrC into liposomes. We demonstrated that the dissolution state of the liposome was a critical factor in the reconstruction of the AgrC proteoliposome, in which AgrC maintained similar orientation and function as those in natural biological membranes. Two monomers, namely, rhein and aloeemodin, were successfully screened out as inhibitors targeting AgrC by the proteoliposome-based model from 14 traditional Chinese medicine monomers. The inhibitory effects of these compounds on the growth of suspended bacteria was dose dependent, and subinhibitory concentrations of these compounds significantly reduced the expression of three virulence factors (hla, clfA, and clpP), that are regulated by the agr system. The results preliminarily indicated that rhein and aloeemodin can inhibit the agr signaling pathway and also indirectly confirmed the feasibility and effectiveness of the AgrC proteoliposome as a drug screening model.
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Affiliation(s)
- Liying Zhang
- College of Life Sciences, Dalian Minzu University, Dalian, China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian, China
| | - Chunshan Quan
- College of Life Sciences, Dalian Minzu University, Dalian, China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian, China
| | - Xuning Zhang
- School of Biological Engineering, Dalian Polytechnic University, Dalian, China
| | - Wen Xiong
- College of Life Sciences, Dalian Minzu University, Dalian, China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian, China
| | - Shengdi Fan
- College of Life Sciences, Dalian Minzu University, Dalian, China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian Minzu University, Dalian, China
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Babu IM, William JJ, Muralidharan G. Surfactant tuned morphology of mesoporous β-Co(OH)2/CMC nanoflakes: a prospective candidate for supercapacitors. J Solid State Electrochem 2019. [DOI: 10.1007/s10008-019-04223-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Coughlan ACH, Torres-Diaz I, Jerri HA, Bevan MA. Direct Measurements of kT-Scale Capsule-Substrate Interactions and Deposition Versus Surfactants and Polymer Additives. ACS APPLIED MATERIALS & INTERFACES 2018; 10:27444-27453. [PMID: 30024154 DOI: 10.1021/acsami.8b06987] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report a novel approach to directly measure the interactions and deposition behavior of functional capsule delivery systems on glass substrates versus the concentration of an anionic surfactant sodium lauryl ether sulfate (SLES) and a cationic acrylamide-acrylamidopropyltrimonium copolymer (AAC). Analyses of three-dimensional optical microscopy trajectories were used to quantify lateral diffusive dynamics, deposition lifetimes, and potentials of mean force for different solution conditions. In the absence of additives, negatively charged capsule surfaces yield electrostatic repulsion with the negatively charged substrate, which inhibits deposition. With an increasing SLES concentration below the critical micelle concentration (CMC), capsule-substrate electrostatic repulsion is mediated by the charged surfactant solution that decreases the Debye length. Above the SLES CMC, depletion attraction causes enhanced deposition until eventually depletion repulsion inhibits deposition at concentrations ∼10 wt %. Addition of an ACC causes deposition via capsule-substrate bridging at all concentrations; the weakest deposition occurs at intermediate AAC concentrations from a competition of steric repulsion and attraction via a few extended bridges. The novel measurements and models of capsule interactions and deposition on substrates in this work provide a basis to fundamentally understand and rationally design complex rinse-off cleansing formulations with optimal characteristics.
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Affiliation(s)
- Anna C H Coughlan
- Chemical & Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Isaac Torres-Diaz
- Chemical & Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Huda A Jerri
- R&D Division , Firmenich Inc. , Plainsboro , New Jersey 08536 , United States
| | - Michael A Bevan
- Chemical & Biomolecular Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States
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Peng H, Rübsam K, Jakob F, Pazdzior P, Schwaneberg U, Pich A. Reversible Deactivation of Enzymes by Redox-Responsive Nanogel Carriers. Macromol Rapid Commun 2016; 37:1765-1771. [DOI: 10.1002/marc.201600476] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 08/20/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Huan Peng
- Functional and Interactive Polymers; Institute of Technical and Macromolecular Chemistry; RWTH Aachen University; Worringerweg 1 52074 Aachen Germany
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
| | - Kristin Rübsam
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
| | - Felix Jakob
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
| | - Patrizia Pazdzior
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
| | - Ulrich Schwaneberg
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
- Institute for Biotechnology; RWTH Aachen University; Worringerweg 3 52074 Aachen Germany
| | - Andrij Pich
- Functional and Interactive Polymers; Institute of Technical and Macromolecular Chemistry; RWTH Aachen University; Worringerweg 1 52074 Aachen Germany
- DWI-Leibniz Institute for Interactive Materials e.V; Forckenbeckstraße 50 52074 Aachen Germany
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Chiang CC, Su CY, Yang AC, Wang TY, Lee WY, Hua CC, Kang DY. Relationships between the solution and solid-state properties of solution-cast low-k silica thin films. Phys Chem Chem Phys 2016; 18:20371-80. [PMID: 27401818 DOI: 10.1039/c6cp04166c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper reports on the fabrication of low-k (amorphous) silica thin films cast from solutions without and with two different types of surfactants (TWEEN® 80 and Triton™ X-100) to elucidate the relationships between the structural/morphological features of the casting solutions and the physical properties of the resulting thin films. Cryogenic transmission microscopy (cryo-TEM), static/dynamic light scattering (SLS/DLS), and small-angle X-ray scattering (SAXS) revealed contrasting colloidal dispersion states and phase behavior among the three casting solutions. Casting solution with the Triton™ X-100 surfactant produced stable (>90 days) nanoparticles with good dispersion in solution (mean particle size ∼10 nm) as well as good mesopore volume (characterized by nitrogen physisorption) in powder and thin films of high mechanical strength (characterized by the nanoindentation test). The longer main chain and bulkier side units of the TWEEN® 80 surfactant led to stable micelle-nanoparticle coexisting dispersion, which resulted in the highest mesopore volume in powder and thin films with the lowest dielectric constant (∼3) among the samples in this study. The casting solution without the surfactant failed to produce a stabilized solution or thin films of acceptable uniformity. These findings demonstrate the possibility of fine-tuning low-k silica film properties by controlling the colloidal state of casting solutions.
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Affiliation(s)
- Chao-Ching Chiang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Chien-You Su
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62102, Taiwan, Republic of China.
| | - An-Chih Yang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Ting-Yu Wang
- Electron Microscope Unit of Instrument Center, National Taiwan University, Taipei 10617, Taiwan, Republic of China
| | - Wen-Ya Lee
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan, Republic of China
| | - Chi-Chung Hua
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62102, Taiwan, Republic of China.
| | - Dun-Yen Kang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
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Wei Y, Sun Z. Liquid-phase exfoliation of graphite for mass production of pristine few-layer graphene. Curr Opin Colloid Interface Sci 2015. [DOI: 10.1016/j.cocis.2015.10.010] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Dandpat SS, Sarkar M. Investigating the molecular and aggregated states of a drug molecule rutaecarpine using spectroscopy, microscopy, crystallography and computational studies. Phys Chem Chem Phys 2015; 17:13992-4002. [DOI: 10.1039/c5cp01980j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present study demonstrates the aggregation behavior of rutaecarpine and the effect of surface active ionic liquids on the dissociation of the aggregates.
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Affiliation(s)
- Shiba Sundar Dandpat
- School of Chemical Sciences
- National Institute of Science Education and Research
- Bhubaneswar 751005
- India
| | - Moloy Sarkar
- School of Chemical Sciences
- National Institute of Science Education and Research
- Bhubaneswar 751005
- India
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Formation and Stability of Vitamin E Enriched Nanoemulsions Stabilized by Octenyl Succinic Anhydride Modified Starch. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2014. [DOI: 10.1515/ijfe-2014-0159] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Abstract
Vitamin E (VE) is highly susceptible to autoxidation; therefore, it requires systems to encapsulate and protect it from autoxidation. In this study, we developed VE delivery systems, which were stabilized by Capsul® (MS), a starch modified with octenyl succinic anhydride. Influences of interfacial tension, VE viscosity, molecular weight distribution, and surfactant type (MS versus Tween 80) on stability and droplet size obtained by high-pressure homogenization were investigated. Both surfactants reduced interfacial tension and small droplet diameters (<350 nm) were produced at high VE content (80% oil phase, w/w) and low emulsifier (2.5%, w/w), which was attributed to their molecular distribution and interfacial characteristics and the magnitude of disruptive forces generated within homogenizer. MS nanoemulsions were stable to droplet coalescence at high temperature–short time exposure (30, 55, 80°C; 30 min). Results indicated that MS can be used successfully to stabilize VE nanoemulsions at ambient temperatures. Such nanoemulsions may be incorporated in many food products.
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Mehtala J, Wei A. Nanometric resolution in the hydrodynamic size analysis of ligand-stabilized gold nanorods. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13737-43. [PMID: 25349895 PMCID: PMC4245992 DOI: 10.1021/la502955h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The stability and hydrodynamic size of ligand-coated gold nanorods (GNRs; aspect ratio 3.6) have been characterized by nanoparticle tracking analysis (NTA)-a single-particle counting method that can measure size distributions with low nanometer resolution. Stable aqueous suspensions of citrate-stabilized GNRs (cit-GNRs) are amenable to surface functionalization without loss of dispersion control. Cit-GNRs can be treated with chemisorptive ligands (thiols and dithiocarbamates), nonionic surfactants (Tween 20), and proteins (human serum albumin), all of which produce stable suspensions at low surfactant concentrations. The precision of NTA (relative standard deviation 10-12%, standard error <2%) is sufficient to allow differences in the hydrodynamic size of coated GNRs to be interpreted in terms of surfactant structure and conformation.
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Halim U, Zheng CR, Chen Y, Lin Z, Jiang S, Cheng R, Huang Y, Duan X. A rational design of cosolvent exfoliation of layered materials by directly probing liquid-solid interaction. Nat Commun 2014; 4:2213. [PMID: 23896793 DOI: 10.1038/ncomms3213] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 06/27/2013] [Indexed: 12/24/2022] Open
Abstract
Exfoliation of layered materials such as graphite and transition metal dichalcogenides into mono- or few-layers is of significant interest for both the fundamental studies and potential applications. Here we report a systematic investigation of the fundamental factors governing the liquid exfoliation process and the rational design of a cosolvent approach for the exfoliation of layered materials. We show that Young's equation can be used to predict the optimal cosolvent concentration for the effective exfoliation of graphite and molybdenum disulphide in water mixtures with methanol, ethanol, isopropanol and t-butyl alcohol. Moreover, we find that the cosolvent molecular size has an important role in the exfoliation yield, attributed to the larger steric repulsion provided by the larger cosolvent molecules. Our study provides critical insight into the exfoliation of layered materials, and defines a rational strategy for the design of an environmentally friendly pathway to the high yield exfoliation of layered materials.
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Affiliation(s)
- Udayabagya Halim
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA
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Gong Y, Zhang MM, Zhang P, Shi HF, Jiang PG, Lin JH. Metal–organic frameworks based on 4-(4-carboxyphenyl)-2,2,4,4-terpyridine: structures, topologies and electrocatalytic behaviors in sodium laurylsulfonate aqueous solution. CrystEngComm 2014. [DOI: 10.1039/c4ce01506a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Two isostructural MOFs show better solubilities in SDS solution than water, and they show different electrocatalytic behaviors for the HER in SDS solution.
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Affiliation(s)
- Yun Gong
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
| | - Miao Miao Zhang
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
| | - Pan Zhang
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
| | - Hui Fang Shi
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
| | - Peng Gang Jiang
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
| | - Jian Hua Lin
- Department of Applied Chemistry
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, PR China
- Zhejiang University
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May A, Pool R, van Dijk E, Bijlard J, Abeln S, Heringa J, Feenstra KA. Coarse-grained versus atomistic simulations: realistic interaction free energies for real proteins. ACTA ACUST UNITED AC 2013; 30:326-34. [PMID: 24273239 DOI: 10.1093/bioinformatics/btt675] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
MOTIVATION To assess whether two proteins will interact under physiological conditions, information on the interaction free energy is needed. Statistical learning techniques and docking methods for predicting protein-protein interactions cannot quantitatively estimate binding free energies. Full atomistic molecular simulation methods do have this potential, but are completely unfeasible for large-scale applications in terms of computational cost required. Here we investigate whether applying coarse-grained (CG) molecular dynamics simulations is a viable alternative for complexes of known structure. RESULTS We calculate the free energy barrier with respect to the bound state based on molecular dynamics simulations using both a full atomistic and a CG force field for the TCR-pMHC complex and the MP1-p14 scaffolding complex. We find that the free energy barriers from the CG simulations are of similar accuracy as those from the full atomistic ones, while achieving a speedup of >500-fold. We also observe that extensive sampling is extremely important to obtain accurate free energy barriers, which is only within reach for the CG models. Finally, we show that the CG model preserves biological relevance of the interactions: (i) we observe a strong correlation between evolutionary likelihood of mutations and the impact on the free energy barrier with respect to the bound state; and (ii) we confirm the dominant role of the interface core in these interactions. Therefore, our results suggest that CG molecular simulations can realistically be used for the accurate prediction of protein-protein interaction strength. AVAILABILITY AND IMPLEMENTATION The python analysis framework and data files are available for download at http://www.ibi.vu.nl/downloads/bioinformatics-2013-btt675.tgz.
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Affiliation(s)
- Ali May
- Centre for Integrative Bioinformatics (IBIVU), VU University Amsterdam, Amsterdam Institute for Molecules Medicines and Systems (AIMMS), VU University Amsterdam, Department of Preventive Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Netherlands Bioinformatics Centre (NBIC), Geert Grooteplein 28 6525 GA Nijmegen, The Netherlands and Department of Biological Psychology, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
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Yi-Pai Huang, Fang-Cheng Lin, Szu-I Wu, Po-Ru Yang. Mechanism and Improvement of Charged-Particles Transition in Microcup Electrophoretic Displays. ACTA ACUST UNITED AC 2013. [DOI: 10.1109/jdt.2013.2251859] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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