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Ruiz Pestana L, Felberg LE, Head-Gordon T. Coexistence of Multilayered Phases of Confined Water: The Importance of Flexible Confining Surfaces. ACS Nano 2018; 12:448-454. [PMID: 29236478 DOI: 10.1021/acsnano.7b06805] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Flexible nanoscale confinement is critical to understanding the role that bending fluctuations play on biological processes where soft interfaces are ubiquitous or to exploit confinement effects in engineered systems where inherently flexible 2D materials are pervasively employed. Here, using molecular dynamics simulations, we compare the phase behavior of water confined between flexible and rigid graphene sheets as a function of the in-plane density, ρ2D. We find that both cases show commensurate mono-, bi-, and trilayered states; however, the water phase in those states and the transitions between them are qualitatively different for the rigid and flexible cases. The rigid systems exhibit discontinuous transitions between an (n)-layer and an (n+1)-layer state at particular values of ρ2D, whereas under flexible confinement, the graphene sheets bend to accommodate an (n)-layer and an (n+1)-layer state coexisting in equilibrium at the same density. We show that the flexible walls introduce a very different sequence of ice phases and their phase coexistence with vapor and liquid phases than that observed with rigid walls. We discuss the applicability of these results to real experimental systems to shed light on the role of flexible confinement and its interplay with commensurability effects.
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Affiliation(s)
- Luis Ruiz Pestana
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | | | - Teresa Head-Gordon
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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Jurrus E, Engel D, Star K, Monson K, Brandi J, Felberg LE, Brookes DH, Wilson L, Chen J, Liles K, Chun M, Li P, Gohara DW, Dolinsky T, Konecny R, Koes DR, Nielsen JE, Head-Gordon T, Geng W, Krasny R, Wei GW, Holst MJ, McCammon JA, Baker NA. Improvements to the APBS biomolecular solvation software suite. Protein Sci 2017; 27:112-128. [PMID: 28836357 DOI: 10.1002/pro.3280] [Citation(s) in RCA: 1086] [Impact Index Per Article: 155.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/21/2017] [Accepted: 08/22/2017] [Indexed: 12/11/2022]
Abstract
The Adaptive Poisson-Boltzmann Solver (APBS) software was developed to solve the equations of continuum electrostatics for large biomolecular assemblages that have provided impact in the study of a broad range of chemical, biological, and biomedical applications. APBS addresses the three key technology challenges for understanding solvation and electrostatics in biomedical applications: accurate and efficient models for biomolecular solvation and electrostatics, robust and scalable software for applying those theories to biomolecular systems, and mechanisms for sharing and analyzing biomolecular electrostatics data in the scientific community. To address new research applications and advancing computational capabilities, we have continually updated APBS and its suite of accompanying software since its release in 2001. In this article, we discuss the models and capabilities that have recently been implemented within the APBS software package including a Poisson-Boltzmann analytical and a semi-analytical solver, an optimized boundary element solver, a geometry-based geometric flow solvation model, a graph theory-based algorithm for determining pKa values, and an improved web-based visualization tool for viewing electrostatics.
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Affiliation(s)
| | - Dave Engel
- Pacific Northwest National Laboratory, Richland, Washington
| | - Keith Star
- Pacific Northwest National Laboratory, Richland, Washington
| | - Kyle Monson
- Pacific Northwest National Laboratory, Richland, Washington
| | - Juan Brandi
- Pacific Northwest National Laboratory, Richland, Washington
| | | | | | | | - Jiahui Chen
- Southern Methodist University, Dallas, Texas
| | - Karina Liles
- Pacific Northwest National Laboratory, Richland, Washington
| | - Minju Chun
- Pacific Northwest National Laboratory, Richland, Washington
| | - Peter Li
- Pacific Northwest National Laboratory, Richland, Washington
| | | | | | - Robert Konecny
- University of California San Diego, San Diego, California
| | - David R Koes
- University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | | | - Weihua Geng
- Southern Methodist University, Dallas, Texas
| | | | - Guo-Wei Wei
- Michigan State University, East Lansing, Michigan
| | | | | | - Nathan A Baker
- Pacific Northwest National Laboratory, Richland, Washington.,Brown University, Providence, Rhode Island
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Carr AC, Felberg LE, Piunova VA, Rice JE, Head-Gordon T, Swope WC. Effect of Hydrophobic Core Topology and Composition on the Structure and Kinetics of Star Polymers: A Molecular Dynamics Study. J Phys Chem B 2017; 121:2902-2918. [DOI: 10.1021/acs.jpcb.7b00865] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amber C. Carr
- IBM
Almaden Research Center, IBM Research, 650 Harry Road, San Jose, California 95120, United States
| | | | - Victoria A. Piunova
- IBM
Almaden Research Center, IBM Research, 650 Harry Road, San Jose, California 95120, United States
| | - Julia E. Rice
- IBM
Almaden Research Center, IBM Research, 650 Harry Road, San Jose, California 95120, United States
| | - Teresa Head-Gordon
- Chemical
Sciences Division, Lawrence Berkeley National Labs, Berkeley, California 94720, United States
| | - William C. Swope
- IBM
Almaden Research Center, IBM Research, 650 Harry Road, San Jose, California 95120, United States
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Felberg LE, Brookes DH, Yap EH, Jurrus E, Baker NA, Head-Gordon T. PB-AM: An open-source, fully analytical linear poisson-boltzmann solver. J Comput Chem 2016; 38:1275-1282. [PMID: 27804145 DOI: 10.1002/jcc.24528] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/18/2016] [Accepted: 10/01/2016] [Indexed: 11/09/2022]
Abstract
We present the open source distributed software package Poisson-Boltzmann Analytical Method (PB-AM), a fully analytical solution to the linearized PB equation, for molecules represented as non-overlapping spherical cavities. The PB-AM software package includes the generation of outputs files appropriate for visualization using visual molecular dynamics, a Brownian dynamics scheme that uses periodic boundary conditions to simulate dynamics, the ability to specify docking criteria, and offers two different kinetics schemes to evaluate biomolecular association rate constants. Given that PB-AM defines mutual polarization completely and accurately, it can be refactored as a many-body expansion to explore 2- and 3-body polarization. Additionally, the software has been integrated into the Adaptive Poisson-Boltzmann Solver (APBS) software package to make it more accessible to a larger group of scientists, educators, and students that are more familiar with the APBS framework. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Lisa E Felberg
- Department of Chemical and Biomolecular Engineering, University of California Berkeley, Berkeley, California, 94720
| | - David H Brookes
- Department of Chemistry, University of California Berkeley, Berkeley, California, 94720
| | - Eng-Hui Yap
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, Bronx, New York, 10461
| | - Elizabeth Jurrus
- Division of Computational and Statistical Analytics, Pacific Northwest National Laboratory, Richland, Washington, 99352.,Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, Utah, 84112
| | - Nathan A Baker
- Advanced Computing, Mathematics, and Data Division, Pacific Northwest National Laboratory, Richland, Washington, 99352.,Division of Applied Mathematics, Brown University, Providence, Rhode Island, 02912
| | - Teresa Head-Gordon
- Department of Chemical and Biomolecular Engineering, University of California Berkeley, Berkeley, California, 94720.,Department of Chemistry, University of California Berkeley, Berkeley, California, 94720.,Department of Bioengineering, University of California Berkeley, Berkeley, California, 94720.,Chemical Sciences Division, Lawrence Berkeley National Labs, Berkeley, California, 94720
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Felberg LE, Doshi A, Hura GL, Sly J, Piunova VA, Swope WC, Rice JE, Miller R, Head-Gordon T. Structural transition of nanogel star polymers with pH by controlling PEGMA interactions with acid or base copolymers. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1224942] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Lisa E. Felberg
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA
| | - Anjali Doshi
- Department of Bioengineering, University of California, Berkeley, CA, USA
| | - Greg L. Hura
- Physical Biosciences Division, Lawrence Berkeley National Labs, Berkeley, CA, USA
| | - Joseph Sly
- IBM Research, IBM Almaden Research Center, San Jose, CA, USA
| | | | | | - Julia E. Rice
- IBM Research, IBM Almaden Research Center, San Jose, CA, USA
| | - Robert Miller
- IBM Research, IBM Almaden Research Center, San Jose, CA, USA
| | - Teresa Head-Gordon
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA
- Department of Bioengineering, University of California, Berkeley, CA, USA
- Department of Chemistry, University of California, Berkeley, CA, USA
- Chemical Sciences Division, Lawrence Berkeley National Labs, Berkeley, CA, USA
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Felberg LE, Brookes DH, Head-Gordon T, Rice JE, Swope WC. Role of hydrophilicity and length of diblock arms for determining star polymer physical properties. J Phys Chem B 2014; 119:944-57. [PMID: 25254622 DOI: 10.1021/jp506203k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We present a molecular simulation study of star polymers consisting of 16 diblock copolymer arms bound to a small adamantane core by varying both arm length and the outer hydrophilic block when attached to the same hydrophobic block of poly-δ-valerolactone. Here we consider two biocompatible star polymers in which the hydrophilic block is composed of polyethylene glycol (PEG) or polymethyloxazoline (POXA) in addition to a polycarbonate-based polymer with a pendant hydrophilic group (PC1). We find that the different hydrophilic blocks of the star polymers show qualitatively different trends in their interactions with aqueous solvent, orientational time correlation functions, and orientational correlation between pairs of monomers of their polymeric arms in solution, in which we find that the PEG polymers are more thermosensitive compared with the POXA and PC1 star polymers over the physiological temperature range we have investigated.
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Affiliation(s)
- Lisa E Felberg
- Department of Chemical and Biomolecular Engineering, ‡Department of Chemistry, and §Department of Bioengineering, University of California Berkeley , Berkeley, California 94720, United States
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Sarode HN, Lindberg GE, Yang Y, Felberg LE, Voth GA, Herring AM. Insights into the Transport of Aqueous Quaternary Ammonium Cations: A Combined Experimental and Computational Study. J Phys Chem B 2014; 118:1363-72. [DOI: 10.1021/jp4085662] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Gerrick E. Lindberg
- Department
of Chemistry, James Franck Institute, Institute for Biophysical
Dynamics, and Computation Institute, University of Chicago, Chicago, Illinois 60637, United States
| | | | - Lisa E. Felberg
- Department
of Chemistry, James Franck Institute, Institute for Biophysical
Dynamics, and Computation Institute, University of Chicago, Chicago, Illinois 60637, United States
| | - Gregory A. Voth
- Department
of Chemistry, James Franck Institute, Institute for Biophysical
Dynamics, and Computation Institute, University of Chicago, Chicago, Illinois 60637, United States
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Felberg LE. PB-SAM, a Novel Solution to the Poison-Boltzmann Equation for Applications in Coarse Grain Dynamics. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.2321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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