1
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Kurnikov IV, Pereyaslavets L, Kamath G, Sakipov SN, Voronina E, Butin O, Illarionov A, Leontyev I, Nawrocki G, Darkhovskiy M, Olevanov M, Ivahnenko I, Chen Y, Lock CB, Levitt M, Kornberg RD, Fain B. Neural Network Corrections to Intermolecular Interaction Terms of a Molecular Force Field Capture Nuclear Quantum Effects in Calculations of Liquid Thermodynamic Properties. J Chem Theory Comput 2024; 20:1347-1357. [PMID: 38240485 PMCID: PMC11042917 DOI: 10.1021/acs.jctc.3c00921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
We incorporate nuclear quantum effects (NQE) in condensed matter simulations by introducing short-range neural network (NN) corrections to the ab initio fitted molecular force field ARROW. Force field NN corrections are fitted to average interaction energies and forces of molecular dimers, which are simulated using the Path Integral Molecular Dynamics (PIMD) technique with restrained centroid positions. The NN-corrected force field allows reproduction of the NQE for computed liquid water and methane properties such as density, radial distribution function (RDF), heat of evaporation (HVAP), and solvation free energy. Accounting for NQE through molecular force field corrections circumvents the need for explicit computationally expensive PIMD simulations in accurate calculations of the properties of chemical and biological systems. The accuracy and locality of pairwise NN NQE corrections indicate that this approach could be applicable to complex heterogeneous systems, such as proteins.
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Affiliation(s)
- Igor V Kurnikov
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Leonid Pereyaslavets
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Ganesh Kamath
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Serzhan N Sakipov
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Ekaterina Voronina
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Oleg Butin
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Alexey Illarionov
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Igor Leontyev
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Grzegorz Nawrocki
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Mikhail Darkhovskiy
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Michael Olevanov
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Ilya Ivahnenko
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - YuChun Chen
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Christopher B Lock
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Palo Alto, California 94304, United States
| | - Michael Levitt
- Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Roger D Kornberg
- Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Boris Fain
- InterX Inc., (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
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2
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Kamath G, Illarionov A, Sakipov S, Pereyaslavets L, Kurnikov IV, Butin O, Voronina E, Ivahnenko I, Leontyev I, Nawrocki G, Darkhovskiy M, Olevanov M, Cherniavskyi YK, Lock C, Greenslade S, Chen Y, Kornberg RD, Levitt M, Fain B. Combining Force Fields and Neural Networks for an Accurate Representation of Bonded Interactions. J Phys Chem A 2024; 128:807-812. [PMID: 38232765 PMCID: PMC11008955 DOI: 10.1021/acs.jpca.3c07598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
We present a formalism of a neural network encoding bonded interactions in molecules. This intramolecular encoding is consistent with the models of intermolecular interactions previously designed by this group. Variants of the encoding fed into a corresponding neural network may be used to economically improve the representation of torsional degrees of freedom in any force field. We test the accuracy of the reproduction of the ab initio potential energy surface on a set of conformations of two dipeptides, methyl-capped ALA and ASP, in several scenarios. The encoding, either alone or in conjunction with an analytical potential, improves agreement with ab initio energies that are on par with those of other neural network-based potentials. Using the encoding and neural nets in tandem with an analytical model places the agreements firmly within "chemical accuracy" of ±0.5 kcal/mol.
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Affiliation(s)
- Ganesh Kamath
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Alexey Illarionov
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Serzhan Sakipov
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Leonid Pereyaslavets
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Igor V Kurnikov
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Oleg Butin
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Ekaterina Voronina
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
- Lomonosov MSU, Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia
| | - Ilya Ivahnenko
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Igor Leontyev
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Grzegorz Nawrocki
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Mikhail Darkhovskiy
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Michael Olevanov
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
- Department of Physics, Lomonosov MSU, Moscow 119991, Russia
| | - Yevhen K Cherniavskyi
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Christopher Lock
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Palo Alto, California 94304, United States
| | - Sean Greenslade
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - YuChun Chen
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
| | - Roger D Kornberg
- Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94304, United States
| | - Michael Levitt
- Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94304, United States
| | - Boris Fain
- InterX Inc. (a subsidiary of NeoTX Therapeutics LTD), 805 Allston Way, Berkeley, California 94710, United States
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3
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Illarionov A, Sakipov S, Pereyaslavets L, Kurnikov IV, Kamath G, Butin O, Voronina E, Ivahnenko I, Leontyev I, Nawrocki G, Darkhovskiy M, Olevanov M, Cherniavskyi YK, Lock C, Greenslade S, Sankaranarayanan SKRS, Kurnikova MG, Potoff J, Kornberg RD, Levitt M, Fain B. Combining Force Fields and Neural Networks for an Accurate Representation of Chemically Diverse Molecular Interactions. J Am Chem Soc 2023; 145:23620-23629. [PMID: 37856313 PMCID: PMC10623557 DOI: 10.1021/jacs.3c07628] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Indexed: 10/21/2023]
Abstract
A key goal of molecular modeling is the accurate reproduction of the true quantum mechanical potential energy of arbitrary molecular ensembles with a tractable classical approximation. The challenges are that analytical expressions found in general purpose force fields struggle to faithfully represent the intermolecular quantum potential energy surface at close distances and in strong interaction regimes; that the more accurate neural network approximations do not capture crucial physics concepts, e.g., nonadditive inductive contributions and application of electric fields; and that the ultra-accurate narrowly targeted models have difficulty generalizing to the entire chemical space. We therefore designed a hybrid wide-coverage intermolecular interaction model consisting of an analytically polarizable force field combined with a short-range neural network correction for the total intermolecular interaction energy. Here, we describe the methodology and apply the model to accurately determine the properties of water, the free energy of solvation of neutral and charged molecules, and the binding free energy of ligands to proteins. The correction is subtyped for distinct chemical species to match the underlying force field, to segment and reduce the amount of quantum training data, and to increase accuracy and computational speed. For the systems considered, the hybrid ab initio parametrized Hamiltonian reproduces the two-body dimer quantum mechanics (QM) energies to within 0.03 kcal/mol and the nonadditive many-molecule contributions to within 2%. Simulations of molecular systems using this interaction model run at speeds of several nanoseconds per day.
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Affiliation(s)
- Alexey Illarionov
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Serzhan Sakipov
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Leonid Pereyaslavets
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Igor V. Kurnikov
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Ganesh Kamath
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Oleg Butin
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Ekaterina Voronina
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
- Lomonosov
MSU, Skobeltsyn Institute of Nuclear Physics, Moscow, 119991, Russia
| | - Ilya Ivahnenko
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Igor Leontyev
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Grzegorz Nawrocki
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Mikhail Darkhovskiy
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Michael Olevanov
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
- Lomonosov
MSU, Dept. of Physics, Moscow, 119991, Russia
| | - Yevhen K. Cherniavskyi
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Christopher Lock
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
- Department
of Neurology and Neurological Sciences, Stanford University School of Medicine, Palo Alto, California 94304, United States
| | - Sean Greenslade
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
| | - Subramanian KRS Sankaranarayanan
- Center
for Nanoscale Materials, Argonne National
Lab, Argonne, Illinois 604391, United States
- Department
of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States
| | - Maria G. Kurnikova
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Jeffrey Potoff
- Department
of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan 48202, United States
| | - Roger D. Kornberg
- Department
of Structural Biology, Stanford University
School of Medicine, Stanford, California 94304, United States
| | - Michael Levitt
- Department
of Structural Biology, Stanford University
School of Medicine, Stanford, California 94304, United States
| | - Boris Fain
- InterX
Inc. (a Subsidiary of NeoTX Therapeutics Ltd.), 805 Allston Way, Berkeley, California 94710, United States
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Nawrocki G, Leontyev I, Sakipov S, Darkhovskiy M, Kurnikov I, Pereyaslavets L, Kamath G, Voronina E, Butin O, Illarionov A, Olevanov M, Kostikov A, Ivahnenko I, Patel DS, Sankaranarayanan SKRS, Kurnikova MG, Lock C, Crooks GE, Levitt M, Kornberg RD, Fain B. Protein-Ligand Binding Free-Energy Calculations with ARROW─A Purely First-Principles Parameterized Polarizable Force Field. J Chem Theory Comput 2022; 18:7751-7763. [PMID: 36459593 PMCID: PMC9753910 DOI: 10.1021/acs.jctc.2c00930] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Indexed: 12/03/2022]
Abstract
Protein-ligand binding free-energy calculations using molecular dynamics (MD) simulations have emerged as a powerful tool for in silico drug design. Here, we present results obtained with the ARROW force field (FF)─a multipolar polarizable and physics-based model with all parameters fitted entirely to high-level ab initio quantum mechanical (QM) calculations. ARROW has already proven its ability to determine solvation free energy of arbitrary neutral compounds with unprecedented accuracy. The ARROW FF parameterization is now extended to include coverage of all amino acids including charged groups, allowing molecular simulations of a series of protein-ligand systems and prediction of their relative binding free energies. We ensure adequate sampling by applying a novel technique that is based on coupling the Hamiltonian Replica exchange (HREX) with a conformation reservoir generated via potential softening and nonequilibrium MD. ARROW provides predictions with near chemical accuracy (mean absolute error of ∼0.5 kcal/mol) for two of the three protein systems studied here (MCL1 and Thrombin). The third protein system (CDK2) reveals the difficulty in accurately describing dimer interaction energies involving polar and charged species. Overall, for all of the three protein systems studied here, ARROW FF predicts relative binding free energies of ligands with a similar accuracy level as leading nonpolarizable force fields.
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Affiliation(s)
- Grzegorz Nawrocki
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Igor Leontyev
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Serzhan Sakipov
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | | | - Igor Kurnikov
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | | | - Ganesh Kamath
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Ekaterina Voronina
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
- Faculty
of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Oleg Butin
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Alexey Illarionov
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Michael Olevanov
- Faculty
of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | | | - Ilya Ivahnenko
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Dhilon S. Patel
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Subramanian K. R. S. Sankaranarayanan
- Center
for Nanoscale Materials, Argonne National
Lab, Lemont, Illinois 60439, United States
- Department
of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States
| | - Maria G. Kurnikova
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Christopher Lock
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
- Department
of Neurology and Neurological Sciences, Stanford University School of Medicine, Palo Alto, California 94304, United States
| | - Gavin E. Crooks
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
| | - Michael Levitt
- Department
of Structural Biology, Stanford University
School of Medicine, Stanford, California 94305, United States
| | - Roger D. Kornberg
- Department
of Structural Biology, Stanford University
School of Medicine, Stanford, California 94305, United States
| | - Boris Fain
- InterX
Inc., 805 Allston Way, Berkeley California, 94710, United States
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5
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Walhout PK, He Z, Dutagaci B, Nawrocki G, Feig M. Molecular Dynamics Simulations of Rhodamine B Zwitterion Diffusion in Polyelectrolyte Solutions. J Phys Chem B 2022; 126:10256-10272. [PMID: 36440862 PMCID: PMC9813770 DOI: 10.1021/acs.jpcb.2c06281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polyelectrolytes continue to find wide interest and application in science and engineering, including areas such as water purification, drug delivery, and multilayer thin films. We have been interested in the dynamics of small molecules in a variety of polyelectrolyte (PE) environments; in this paper, we report simulations and analysis of the small dye molecule rhodamine B (RB) in several very simple polyelectrolyte solutions. Translational diffusion of the RB zwitterion has been measured in fully atomistic, 2 μs long molecular dynamics simulations in four different polyelectrolyte solutions. Two solutions contain the common polyanion sodium poly(styrene sulfonate) (PSS), one with a 30-mer chain and the other with 10 trimers. The other two solutions contain the common polycation poly(allyldimethylammonium) chloride (PDDA), one with two 15-mers and the other with 10 trimers. RB diffusion was also simulated in several polymer-free solutions to verify its known experimental value for the translational diffusion coefficient, DRB, of 4.7 × 10-6 cm2/s at 300 K. RB diffusion was slowed in all four simulated PE solutions, but to varying degrees. DRB values of 3.07 × 10-6 and 3.22 × 10-6 cm2/s were found in PSS 30-mer and PSS trimer solutions, respectively, whereas PDDA 15-mer and trimer solutions yielded values of 2.19 × 10-6 and 3.34 × 10-6 cm2/s. Significant associations between RB and the PEs were analyzed and interpreted via a two-state diffusion model (bound and free diffusion) that describes the data well. Crowder size effects and anomalous diffusion were also analyzed. Finally, RB translation along the polyelectrolytes during association was characterized.
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Affiliation(s)
| | - Zhe He
- Wheaton College, Chemistry Department, 501 College Ave, Wheaton, IL 60187
| | - Bercem Dutagaci
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
| | - Grzegorz Nawrocki
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
| | - Michael Feig
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
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6
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Pereyaslavets L, Kamath G, Butin O, Illarionov A, Olevanov M, Kurnikov I, Sakipov S, Leontyev I, Voronina E, Gannon T, Nawrocki G, Darkhovskiy M, Ivahnenko I, Kostikov A, Scaranto J, Kurnikova MG, Banik S, Chan H, Sternberg MG, Sankaranarayanan SKRS, Crawford B, Potoff J, Levitt M, Kornberg RD, Fain B. Accurate determination of solvation free energies of neutral organic compounds from first principles. Nat Commun 2022; 13:414. [PMID: 35058472 PMCID: PMC8776904 DOI: 10.1038/s41467-022-28041-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 01/03/2022] [Indexed: 12/28/2022] Open
Abstract
The main goal of molecular simulation is to accurately predict experimental observables of molecular systems. Another long-standing goal is to devise models for arbitrary neutral organic molecules with little or no reliance on experimental data. While separately these goals have been met to various degrees, for an arbitrary system of molecules they have not been achieved simultaneously. For biophysical ensembles that exist at room temperature and pressure, and where the entropic contributions are on par with interaction strengths, it is the free energies that are both most important and most difficult to predict. We compute the free energies of solvation for a diverse set of neutral organic compounds using a polarizable force field fitted entirely to ab initio calculations. The mean absolute errors (MAE) of hydration, cyclohexane solvation, and corresponding partition coefficients are 0.2 kcal/mol, 0.3 kcal/mol and 0.22 log units, i.e. within chemical accuracy. The model (ARROW FF) is multipolar, polarizable, and its accompanying simulation stack includes nuclear quantum effects (NQE). The simulation tools' computational efficiency is on a par with current state-of-the-art packages. The construction of a wide-coverage molecular modelling toolset from first principles, together with its excellent predictive ability in the liquid phase is a major advance in biomolecular simulation.
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Affiliation(s)
| | - Ganesh Kamath
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
| | - Oleg Butin
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
| | | | - Michael Olevanov
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
- Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - Igor Kurnikov
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
| | | | - Igor Leontyev
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
| | - Ekaterina Voronina
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
- Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - Tyler Gannon
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA
| | | | | | | | | | - Jessica Scaranto
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Maria G Kurnikova
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Suvo Banik
- Center for Nanoscale Materials, Argonne National Lab, Argonne, IL, 60439, USA
- Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, IL, 60607, USA
| | - Henry Chan
- Center for Nanoscale Materials, Argonne National Lab, Argonne, IL, 60439, USA
- Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, IL, 60607, USA
| | - Michael G Sternberg
- Center for Nanoscale Materials, Argonne National Lab, Argonne, IL, 60439, USA
| | - Subramanian K R S Sankaranarayanan
- Center for Nanoscale Materials, Argonne National Lab, Argonne, IL, 60439, USA
- Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, IL, 60607, USA
| | - Brad Crawford
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI, 48202, USA
| | - Jeffrey Potoff
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI, 48202, USA
| | - Michael Levitt
- Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, 94304, USA
| | - Roger D Kornberg
- Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, 94304, USA
| | - Boris Fain
- InterX Inc, 805 Allston Way, Berkeley, CA, 94710, USA.
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7
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Dutagaci B, Nawrocki G, Goodluck J, Ashkarran AA, Hoogstraten CG, Lapidus LJ, Feig M. Charge-driven condensation of RNA and proteins suggests broad role of phase separation in cytoplasmic environments. eLife 2021; 10:64004. [PMID: 33496264 PMCID: PMC7877912 DOI: 10.7554/elife.64004] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 01/25/2021] [Indexed: 02/06/2023] Open
Abstract
Phase separation processes are increasingly being recognized as important organizing mechanisms of biological macromolecules in cellular environments. Well-established drivers of phase separation are multi-valency and intrinsic disorder. Here, we show that globular macromolecules may condense simply based on electrostatic complementarity. More specifically, phase separation of mixtures between RNA and positively charged proteins is described from a combination of multiscale computer simulations with microscopy and spectroscopy experiments. Phase diagrams were mapped out as a function of molecular concentrations in experiment and as a function of molecular size and temperature via simulations. The resulting condensates were found to retain at least some degree of internal dynamics varying as a function of the molecular composition. The results suggest a more general principle for phase separation that is based primarily on electrostatic complementarity without invoking polymer properties as in most previous studies. Simulation results furthermore suggest that such phase separation may occur widely in heterogenous cellular environment between nucleic acid and protein components.
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Affiliation(s)
- Bercem Dutagaci
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, United States
| | - Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, United States
| | - Joyce Goodluck
- Department of Physics, Michigan State University, East Lansing, United States
| | - Ali Akbar Ashkarran
- Precision Health Program and Department of Radiology, Michigan State University, East Lansing, United States
| | - Charles G Hoogstraten
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, United States
| | - Lisa J Lapidus
- Department of Physics, Michigan State University, East Lansing, United States
| | - Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, United States
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8
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Kosakowska E, Pietrzak L, Michalski W, Kepka L, Polkowski W, Jankiewicz M, Cisel B, Krynski J, Zwolinski J, Wyrwicz L, Rutkowski A, Stylinski R, Nawrocki G, Sopylo R, Szczepkowski M, Tarnowski W, Bujko K. Neoadjuvant chemotherapy with or without oxaliplatin after short-course radiotherapy in high-risk rectal cancer: A subgroup analysis from a prospective study. Rep Pract Oncol Radiother 2020; 25:1017-1022. [PMID: 33390858 DOI: 10.1016/j.rpor.2020.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 06/26/2020] [Revised: 07/28/2020] [Accepted: 08/11/2020] [Indexed: 02/08/2023] Open
Abstract
Aim To evaluate the role of oxaliplatin in neoadjuvant chemotherapy delivered after short-course irradiation. Background Using oxaliplatin in the above setting is uncertain. Patients and methods A subgroup of 136 patients managed by short-course radiotherapy and 3 cycles of consolidation chemotherapy within the framework of a randomised study was included in this post-hoc analysis. Sixty-seven patients received FOLFOX4 (oxaliplatin group) while oxaliplatin was omitted in the second period of accrual in 69 patients because of protocol amendment (fluorouracil-only group). Results Grade 3+ acute toxicity from neoadjuvant treatment was observed in 30% of patients in the oxaliplatin group vs. 16% in the fluorouracil-only group (p = 0.053). The corresponding proportions of patients having radical surgery or achieving complete pathological response were 72% vs. 77% (odds ratio [OR] = 0.88; 95% confidence interval [CI]: 0.39-1.98; p = 0.75) and 15% vs. 7% (OR = 2.25; 95% CI: 0.83-6.94; p = 0.16), respectively. The long-term outcomes were similar in the two groups. Overall and disease-free survival rates at 5 years were 63% vs. 56% (p = 0.78) and 49% vs. 44% (p = 0.59), respectively. The corresponding numbers for cumulative incidence of local failure or distant metastases were 33% vs. 38% (hazard ratio [HR] = 0.89; 95% CI: 0.52-1.52; p = 0.68) and 33% vs. 33% (HR = 0.78; 95% CI: 0.43-1.40; p = 0.41), respectively. Conclusion Our findings do not support adding oxaliplatin to three cycles of chemotherapy delivered after short-course irradiation.
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Affiliation(s)
- Ewa Kosakowska
- Department of Gastroenterological Oncology, Maria Sklodowska-Curie National, Research Institute of Oncology, Warsaw, Poland
| | - Lucyna Pietrzak
- I Department of Radiotherapy, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Wojciech Michalski
- Department of Computational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Lucyna Kepka
- Department of Radiotherapy, Military Institute of Medicine, Warsaw, Poland
| | | | | | - Bogumila Cisel
- Department of Surgical Oncology, Medical University of Lublin, Poland
| | - Jacek Krynski
- Department of Gastroenterological Oncology, Maria Sklodowska-Curie National, Research Institute of Oncology, Warsaw, Poland
| | - Jacek Zwolinski
- Department of Gastroenterological Oncology, Maria Sklodowska-Curie National, Research Institute of Oncology, Warsaw, Poland
| | - Lucjan Wyrwicz
- Department of Oncology and Radiotherapy, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Andrzej Rutkowski
- Department of Gastroenterological Oncology, Maria Sklodowska-Curie National, Research Institute of Oncology, Warsaw, Poland
| | - Roman Stylinski
- 1st Department of General Surgery, Transplantology and Nutritional Therapy, Medical University of Lublin, Poland
| | - Grzegorz Nawrocki
- Department of Surgery, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Rafal Sopylo
- Department of Surgery, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Marek Szczepkowski
- Clinical Department of Colorectal, General and Oncological Surgery, Centre of Postgraduate Medical Education, Bielanski Hospital, Warsaw, Poland
| | - Wieslaw Tarnowski
- Department of General, Oncologic and Digestive Tract Surgery, Medical Centre of Postgraduate Education, Orlowski Hospital, Warsaw, Poland
| | - Krzysztof Bujko
- I Department of Radiotherapy, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
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9
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Nawrocki G, Karaboga A, Sugita Y, Feig M. Effect of protein-protein interactions and solvent viscosity on the rotational diffusion of proteins in crowded environments. Phys Chem Chem Phys 2019; 21:876-883. [PMID: 30560249 DOI: 10.1039/c8cp06142d] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rotational diffusion of a protein in the presence of protein crowder molecules was analyzed via computer simulations. Cluster formation as a result of transient intermolecular contacts was identified as the dominant effect for reduced rotational diffusion upon crowding. The slow-down in diffusion was primarily correlated with direct protein-protein contacts rather than indirect interactions via shared hydration layers. But increased solvent viscosity due to crowding contributed to a lesser extent. Key protein-protein contacts correlated with a slow-down in diffusion involve largely interactions between charged and polar groups suggesting that the surface composition of a given protein and the resulting propensity for forming interactions with surrounding proteins in a crowded cellular environment may be the major determinant of its diffusive properties.
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Affiliation(s)
- Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, 603 Wilson Rd., Room 218 BCH, East Lansing, MI 48824, USA.
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10
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Woodard J, Srivastava KR, Rahamim G, Grupi A, Hogan S, Witalka DJ, Nawrocki G, Haas E, Feig M, Lapidus LJ. Intramolecular Diffusion in α-Synuclein: It Depends on How You Measure It. Biophys J 2018; 115:1190-1199. [PMID: 30224053 DOI: 10.1016/j.bpj.2018.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 08/09/2018] [Accepted: 08/21/2018] [Indexed: 10/28/2022] Open
Abstract
Intramolecular protein diffusion, the motion of one part of the polypeptide chain relative to another part, is a fundamental aspect of protein folding and may modulate amyloidogenesis of disease-associated intrinsically disordered proteins. Much work has determined such diffusion coefficients using a variety of probes, but there has been an apparent discrepancy between measurements using long-range probes, such as fluorescence resonance energy transfer, and short-range probes, such as Trp-Cys quenching. In this work, we make both such measurements on the same protein, α-synuclein, and confirm that such discrepancy exists. Molecular dynamics simulations suggest that such differences result from a diffusion coefficient that depends on the spatial distance between probes. Diffusional estimates in good quantitative agreement with experiment are obtained by accounting for the distinct distance ranges probed by fluorescence resonance energy transfer and Trp-Cys quenching.
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Affiliation(s)
- Jaie Woodard
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan
| | - Kinshuk R Srivastava
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan
| | - Gil Rahamim
- The Goodman Faculty of Life Science, Bar-Ilan University, Ramat Gan, Israel
| | - Asaf Grupi
- The Goodman Faculty of Life Science, Bar-Ilan University, Ramat Gan, Israel
| | - Steven Hogan
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan
| | - David J Witalka
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan
| | - Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan
| | - Elisha Haas
- The Goodman Faculty of Life Science, Bar-Ilan University, Ramat Gan, Israel
| | - Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan
| | - Lisa J Lapidus
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan.
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11
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Feig M, Nawrocki G, Yu I, Wang PH, Sugita Y. Challenges and opportunities in connecting simulations with experiments via molecular dynamics of cellular environments. J Phys Conf Ser 2018; 1036:012010. [PMID: 30613205 PMCID: PMC6319911 DOI: 10.1088/1742-6596/1036/1/012010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Computer simulations are widely used to study molecular systems, especially in biology. As simulations have greatly increased in scale reaching cellular levels there are now significant challenges in managing, analyzing, and interpreting such data in comparison with experiments that are being discussed. Management challenges revolve around storing and sharing terabyte to petabyte scale data sets whereas the analysis of simulations of highly complex systems will increasingly require automated machine learning and artificial intelligence approaches. The comparison between simulations and experiments is furthermore complicated not just by the complexity of the data but also by difficulties in interpreting experiments for highly heterogeneous systems. As an example, the interpretation of NMR relaxation measurements and comparison with simulations for highly crowded systems is discussed.
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Affiliation(s)
- Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, 48824 USA
- Quantitative Biology Center, RIKEN, Kobe, Japan
| | - Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, 48824 USA
| | - Isseki Yu
- Theoretical Molecular Science Laboratory, RIKEN, Wako, Japan
- iTHES Research Group, RIKEN, Wako, Japan
| | - Po-hung Wang
- Theoretical Molecular Science Laboratory, RIKEN, Wako, Japan
| | - Yuji Sugita
- Quantitative Biology Center, RIKEN, Kobe, Japan
- Theoretical Molecular Science Laboratory, RIKEN, Wako, Japan
- iTHES Research Group, RIKEN, Wako, Japan
- Advanced Institute for Computational Science, RIKEN, Kobe, Japan
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12
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Nawrocki G, Wang PH, Yu I, Sugita Y, Feig M. Protein Diffusion in a Dense Solution Studied by All-Atom Molecular Dynamics Simulations. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.1300] [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: 10/18/2022] Open
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13
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Abstract
For a long time, the effect of a crowded cellular environment on protein dynamics has been largely ignored. Recent experiments indicate that proteins diffuse more slowly in a living cell than in a diluted solution, and further studies suggest that the diffusion depends on the local surroundings. Here, detailed insight into how diffusion depends on protein-protein contacts is presented based on extensive all-atom molecular dynamics simulations of concentrated villin headpiece solutions. After force field adjustments in the form of increased protein-water interactions to reproduce experimental data, translational and rotational diffusion was analyzed in detail. Although internal protein dynamics remained largely unaltered, rotational diffusion was found to slow down more significantly than translational diffusion as the protein concentration increased. The decrease in diffusion is interpreted in terms of a transient formation of protein clusters. These clusters persist on sub-microsecond time scales and follow distributions that increasingly shift toward larger cluster size with increasing protein concentrations. Weighting diffusion coefficients estimated for different clusters extracted from the simulations with the distribution of clusters largely reproduces the overall observed diffusion rates, suggesting that transient cluster formation is a primary cause for a slow-down in diffusion upon crowding with other proteins.
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Affiliation(s)
- Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, United States
| | - Po-hung Wang
- RIKEN Theoretical Molecular Science Laboratory, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Isseki Yu
- RIKEN Theoretical Molecular Science Laboratory, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- RIKEN iTHES, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Yuji Sugita
- RIKEN Theoretical Molecular Science Laboratory, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- RIKEN iTHES, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- RIKEN Quantitative Biology Center, Integrated Innovation Building 7F, 6-7-1 Minaotojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- RIKEN Advanced Institute for Computational Science, 7-1-26 Minatojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, United States
- RIKEN Quantitative Biology Center, Integrated Innovation Building 7F, 6-7-1 Minaotojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
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14
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Abstract
![]()
The
effects of crowding in biological environments on biomolecular
structure, dynamics, and function remain not well understood. Computer
simulations of atomistic models of concentrated peptide and protein
systems at different levels of complexity are beginning to provide
new insights. Crowding, weak interactions with other macromolecules
and metabolites, and altered solvent properties within cellular environments
appear to remodel the energy landscape of peptides and proteins in
significant ways including the possibility of native state destabilization.
Crowding is also seen to affect dynamic properties, both conformational
dynamics and diffusional properties of macromolecules. Recent simulations
that address these questions are reviewed here and discussed in the
context of relevant experiments.
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Affiliation(s)
- Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University , East Lansing, Michigan, United States.,Quantitative Biology Center, RIKEN , Kobe, Japan
| | - Isseki Yu
- Theoretical Molecular Science Laboratory, RIKEN , Wako, Japan.,iTHES Research Group, RIKEN , Wako, Japan
| | - Po-Hung Wang
- Theoretical Molecular Science Laboratory, RIKEN , Wako, Japan
| | - Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University , East Lansing, Michigan, United States
| | - Yuji Sugita
- Quantitative Biology Center, RIKEN , Kobe, Japan.,Theoretical Molecular Science Laboratory, RIKEN , Wako, Japan.,iTHES Research Group, RIKEN , Wako, Japan.,Advanced Institute for Computational Science, RIKEN , Kobe, Japan
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15
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Huang J, Rauscher S, Nawrocki G, Ran T, Feig M, de Groot BL, Grubmüller H, MacKerell AD. CHARMM36m: an improved force field for folded and intrinsically disordered proteins. Nat Methods 2017. [PMID: 27819658 DOI: 10.1038/2fnmeth.4067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
The all-atom additive CHARMM36 protein force field is widely used in molecular modeling and simulations. We present its refinement, CHARMM36m (http://mackerell.umaryland.edu/charmm_ff.shtml), with improved accuracy in generating polypeptide backbone conformational ensembles for intrinsically disordered peptides and proteins.
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Affiliation(s)
- Jing Huang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, USA
| | - Sarah Rauscher
- Department of Theoretical and Computational Biophysics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Grzegorz Nawrocki
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Ting Ran
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, USA
| | - Michael Feig
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Bert L de Groot
- Department of Theoretical and Computational Biophysics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Helmut Grubmüller
- Department of Theoretical and Computational Biophysics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Alexander D MacKerell
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, USA
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16
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Bujko K, Wyrwicz L, Rutkowski A, Malinowska M, Pietrzak L, Kryński J, Michalski W, Olędzki J, Kuśnierz J, Zając L, Bednarczyk M, Szczepkowski M, Tarnowski W, Kosakowska E, Zwoliński J, Winiarek M, Wiśniowska K, Partycki M, Bęczkowska K, Polkowski W, Styliński R, Wierzbicki R, Bury P, Jankiewicz M, Paprota K, Lewicka M, Ciseł B, Skórzewska M, Mielko J, Bębenek M, Maciejczyk A, Kapturkiewicz B, Dybko A, Hajac Ł, Wojnar A, Leśniak T, Zygulska J, Jantner D, Chudyba E, Zegarski W, Las-Jankowska M, Jankowski M, Kołodziejski L, Radkowski A, Żelazowska-Omiotek U, Czeremszyńska B, Kępka L, Kolb-Sielecki J, Toczko Z, Fedorowicz Z, Dziki A, Danek A, Nawrocki G, Sopyło R, Markiewicz W, Kędzierawski P, Wydmański J. Long-course oxaliplatin-based preoperative chemoradiation versus 5 × 5 Gy and consolidation chemotherapy for cT4 or fixed cT3 rectal cancer: results of a randomized phase III study. Ann Oncol 2016; 27:834-42. [PMID: 26884592 DOI: 10.1093/annonc/mdw062] [Citation(s) in RCA: 260] [Impact Index Per Article: 32.5] [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: 12/23/2015] [Accepted: 02/08/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Improvements in local control are required when using preoperative chemoradiation for cT4 or advanced cT3 rectal cancer. There is therefore a need to explore more effective schedules. PATIENTS AND METHODS Patients with fixed cT3 or cT4 cancer were randomized either to 5 × 5 Gy and three cycles of FOLFOX4 (group A) or to 50.4 Gy in 28 fractions combined with two 5-day cycles of bolus 5-Fu 325 mg/m(2)/day and leucovorin 20 mg/m(2)/day during the first and fifth week of irradiation along with five infusions of oxaliplatin 50 mg/m(2) once weekly (group B). The protocol was amended in 2012 to allow oxaliplatin to be then foregone in both groups. RESULTS Of 541 entered patients, 515 were eligible for analysis; 261 in group A and 254 in group B. Preoperative treatment acute toxicity was lower in group A than group B, P = 0.006; any toxicity being, respectively, 75% versus 83%, grade III-IV 23% versus 21% and toxic deaths 1% versus 3%. R0 resection rates (primary end point) and pathological complete response rates in groups A and B were, respectively, 77% versus 71%, P = 0.07, and 16% versus 12%, P = 0.17. The median follow-up was 35 months. At 3 years, the rates of overall survival and disease-free survival in groups A and B were, respectively, 73% versus 65%, P = 0.046, and 53% versus 52%, P = 0.85, together with the cumulative incidence of local failure and distant metastases being, respectively, 22% versus 21%, P = 0.82, and 30% versus 27%, P = 0.26. Postoperative and late complications rates in group A and group B were, respectively, 29% versus 25%, P = 0.18, and 20% versus 22%, P = 0.54. CONCLUSIONS No differences were observed in local efficacy between 5 × 5 Gy with consolidation chemotherapy and long-course chemoradiation. Nevertheless, an improved overall survival and lower acute toxicity favours the 5 × 5 Gy schedule with consolidation chemotherapy. CLINICAL TRIAL NUMBER The trial is registered as ClinicalTrials.gov number NCT00833131.
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Affiliation(s)
| | - L Wyrwicz
- Department of Gastroenterological Oncology
| | | | | | | | - J Kryński
- Department of Gastroenterological Oncology
| | - W Michalski
- Department of Bioinformatics and Biostatistics Unit, M. Skłodowska-Curie Memorial Cancer Centre, Warsaw
| | - J Olędzki
- Department of Colorectal Surgery, Medical University, Warsaw
| | - J Kuśnierz
- Department of Gynecology, M. Skłodowska-Curie Memorial Cancer Centre, Warsaw
| | - L Zając
- Department of Gastroenterological Oncology
| | | | - M Szczepkowski
- Department of Rehabilitation, Jozef Piłsudski University of Physical Education, Warsaw Clinical Department of General and Colorectal Surgery, Bielański Hospital, Warsaw
| | - W Tarnowski
- Department of General, Oncologic and Digestive Tract Surgery, Medical Centre of Postgraduate Education, Orłowski Hospital, Warsaw
| | | | | | - M Winiarek
- Department of Gastroenterological Oncology
| | | | | | | | - W Polkowski
- Department of Surgical Oncology, Medical University of Lublin, Lublin
| | - R Styliński
- First Department of General Surgery, Transplantology and Nutritional Therapy, Medical University of Lublin, Lublin
| | | | - P Bury
- II Chair and Department of General and Gastrointestinal Surgery and Surgical Oncology of the Alimentary Tract, Medical University, Lublin
| | - M Jankiewicz
- Department of Surgical Oncology, Medical University of Lublin, Lublin Department of Radiotherapy, St John's Cancer Center, Lublin
| | - K Paprota
- Department of Radiotherapy, St John's Cancer Center, Lublin
| | - M Lewicka
- Department of Surgical Oncology, Medical University of Lublin, Lublin
| | - B Ciseł
- Department of Surgical Oncology, Medical University of Lublin, Lublin
| | - M Skórzewska
- Department of Surgical Oncology, Medical University of Lublin, Lublin
| | - J Mielko
- Department of Surgical Oncology, Medical University of Lublin, Lublin
| | | | | | | | | | | | - A Wojnar
- Pathology, Silesian Oncological Centre, Wroclaw
| | - T Leśniak
- Department of Surgery, Beskid Centre of Oncology, Bielsko-Biala
| | - J Zygulska
- Department of Radiotherapy, Beskid Centre of Oncology, Bielsko-Biala
| | - D Jantner
- Department of Surgery, Beskid Centre of Oncology, Bielsko-Biala
| | - E Chudyba
- Department of Radiotherapy, Beskid Centre of Oncology, Bielsko-Biala
| | - W Zegarski
- Department of Oncological Surgery, Collegium Medicum Nicolaus Copernicus University and Oncology Centre, Bydgoszcz
| | - M Las-Jankowska
- Department of Oncological Surgery, Collegium Medicum Nicolaus Copernicus University and Oncology Centre, Bydgoszcz
| | - M Jankowski
- Department of Oncological Surgery, Collegium Medicum Nicolaus Copernicus University and Oncology Centre, Bydgoszcz
| | | | - A Radkowski
- Department of Radiotherapy, Regional Cancer Centre, Tarnów
| | | | - B Czeremszyńska
- Department Radiotherapy, Independent Public Health Care Facility of the Ministry of the Interior and Warmian-Masurian Oncology Centre, Olsztyn
| | - L Kępka
- Department Radiotherapy, Independent Public Health Care Facility of the Ministry of the Interior and Warmian-Masurian Oncology Centre, Olsztyn
| | - J Kolb-Sielecki
- Department Radiotherapy, Independent Public Health Care Facility of the Ministry of the Interior and Warmian-Masurian Oncology Centre, Olsztyn
| | - Z Toczko
- Department of Surgery, Regional Hospital, Elbląg
| | - Z Fedorowicz
- Department of Surgery, Regional Hospital, Elbląg
| | - A Dziki
- Department of Surgery, Medical University, Lódź
| | | | - G Nawrocki
- Department of Surgery, M. Skłodowska-Curie Memorial Cancer Centre, Warsaw
| | - R Sopyło
- Department of Surgery, M. Skłodowska-Curie Memorial Cancer Centre, Warsaw
| | - W Markiewicz
- Department of Surgery, Regional Cancer Centre, Białystok
| | - P Kędzierawski
- Department of Radiotherapy, Regional Oncological Centre, Kielce
| | - J Wydmański
- Department of Radiotherapy, M. Skłodowska-Curie Memorial Cancer Centre, Gliwice, Poland
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17
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Cieplak M, Nawrocki G. Proteins Near Solid Surfaces and at Air-Water Interfaces. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.3454] [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: 10/22/2022] Open
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18
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Nawrocki G, Cieplak M. Interactions of aqueous amino acids and proteins with the (110) surface of ZnS in molecular dynamics simulations. J Chem Phys 2014; 140:095101. [DOI: 10.1063/1.4866763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Łągiewska B, Pacholczyk M, Lisik W, Cichocki A, Nawrocki G, Trzebicki J, Chmura A. Liver transplantation for nonresectable metastatic solid pseudopapillary pancreatic cancer. Ann Transplant 2013; 18:651-3. [PMID: 24280737 DOI: 10.12659/aot.889979] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Solid pseudopapillary tumor (SPT) of the pancreas, also known as Franz tumor, Hamoudie tumor, solid-cystic-papillary epithelial neoplasm, or solid and cystic tumor, is a neoplasm of transitory (potential) malignancy, seen predominantly in young women. CASE REPORT This report presents a female patient treated for a solid pseudopapillary tumor of the pancreas with hepatic metastases. The tumor was first diagnosed in 2006. Non-specific abdominal pain was the first presenting symptom. The patient underwent distal pancreatic resection and splenectomy in July 2006. Multifocal metastatic disease seen at surgery precluded radical resection. Following definitive pathology confirmation and the exclusion of extrahepatic metastases, the patient was referred to our transplant centre 18 months after pancreatic surgery, to be considered for orthotopic liver transplantation (OLTx). The extent of the disease was once again evaluated by imaging studies, followed by exploratory laparotomy. The patient underwent cadaveric liver transplantation in March 2008, with triple immunosuppression (tacrolimus, MMF, and steroids) following surgery. Presently, more than 5 years post-transplant, the patient has no signs of recurrent neoplasmatic disease. CONCLUSIONS This is the first liver transplantation for a metastatic pancreatic pseudopapillary tumor in Poland, with the longest follow-up period described in the literature. Follow-up suggests a cautiously optimistic prognosis despite primary unresectability of hepatic metastases and the necessity for immunosuppressive therapy.
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Bujko K, Richter P, Smith FM, Polkowski W, Szczepkowski M, Rutkowski A, Dziki A, Pietrzak L, Kołodziejczyk M, Kuśnierz J, Gach T, Kulig J, Nawrocki G, Radziszewski J, Wierzbicki R, Kowalska T, Meissner W, Radkowski A, Paprota K, Polkowski M, Rychter A. Preoperative radiotherapy and local excision of rectal cancer with immediate radical re-operation for poor responders: a prospective multicentre study. Radiother Oncol 2013; 106:198-205. [PMID: 23333016 DOI: 10.1016/j.radonc.2012.12.005] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 12/13/2012] [Accepted: 12/13/2012] [Indexed: 12/12/2022]
Abstract
PURPOSE To assess local control after preoperative radiation and local excision and to determine an optimal radiotherapy regimen. METHODS Eighty-nine patients with G1-2 rectal adenocarcinoma <3-4 cm; unfavourable cT1N0 (23.6%), cT2N0 (62.9%) or borderline cT2/cT3N0 (13.5%) received 5 × 5 Gy plus 4 Gy boost (71.9%) or 55.8 Gy in 31 fractions with 5-FU and leucovorin (28.1%). Local excision (traditional technique 56.2%, transanal endoscopic microsurgery 41.6%, Kraske procedure 2.2%) was performed 6-8 weeks later. If patients were downstaged to ypT0-1 without unfavourable factors (good responders), this was deemed definitive treatment. Immediate conversion to radical surgery was recommended for remaining patients. RESULTS Good response to radiation was seen in 67.2% of patients in the short-course group and in 80.0% in the chemoradiation group, p = 0.30. Local recurrence at 2 years (median follow-up) in good responders was 11.8% in the short-course group and 6.2% in the chemoradiation group, p = 0.53. In the total group, a lower rate of local recurrence at 2 years was observed in elderly patients (>69 years, median value) when compared to the younger patients; 8.3% vs. 27.7%, Cox analysis hazard ratio 0.232, p = 0.016. A total of 18 patients initially managed with local excision required conversion to abdominal surgery but either refused it or were unfit. In this group, local recurrence at 2 years was 37.1%. CONCLUSIONS This study suggests an acceptable local recurrence rate after preoperative radiotherapy and local excision of small, radiosensitive tumours in elderly patients.
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Affiliation(s)
- Krzysztof Bujko
- Department of Radiotherapy, Maria Sklodowska-Curie Memorial Cancer Centre, Warsaw, Poland.
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Nawrocki G, Cieplak M. Amino acids and proteins at ZnO–water interfaces in molecular dynamics simulations. Phys Chem Chem Phys 2013; 15:13628-36. [DOI: 10.1039/c3cp52198b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wisniewska-Becker A, Nawrocki G, Duda M, Subczynski WK. Structural aspects of the antioxidant activity of lutein in a model of photoreceptor membranes. Acta Biochim Pol 2012; 59:119-124. [PMID: 22428148 PMCID: PMC4116753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 03/01/2012] [Indexed: 05/31/2023]
Abstract
It was shown that in membranes containing raft domains, the macular xanthophylls lutein and zeaxanthin are not distributed uniformly, but are excluded from saturated raft domains and about ten times more concentrated in unsaturated bulk lipids. The selective accumulation of lutein and zeaxanthin in direct proximity to unsaturated lipids, which are especially susceptible to lipid peroxidation, could be very important as far as their antioxidant activity is concerned. Therefore, the protective role of lutein against lipid peroxidation was investigated in membranes made of raft-forming mixtures and in models of photoreceptor outer segment membranes and compared with their antioxidant activity in homogeneous membranes composed of unsaturated lipids. Lipid peroxidation was induced by photosensitized reactions using rose Bengal and monitored by an MDA-TBA test, an iodometric assay, and oxygen consumption (using EPR spectroscopy and the mHCTPO spin label as an oxygen probe). The results show that lutein protects unsaturated lipids more effectively in membranes made of raft-forming mixtures than in homogeneous membranes. This suggests that the selective accumulation of macular xanthophylls in the most vulnerable regions of photoreceptor membranes may play an important role in enhancing their antioxidant properties and ability to prevent age-related macular diseases (such as age-related macular degeneration (AMD)).
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Affiliation(s)
- Anna Wisniewska-Becker
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland.
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Wisniewska-Becker A, Nawrocki G, Duda M, Subczynski WK. Structural aspects of the antioxidant activity of lutein in a model of photoreceptor membranes. Acta Biochim Pol 2012. [DOI: 10.18388/abp.2012_2185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
It was shown that in membranes containing raft domains, the macular xanthophylls lutein and zeaxanthin are not distributed uniformly, but are excluded from saturated raft domains and about ten times more concentrated in unsaturated bulk lipids. The selective accumulation of lutein and zeaxanthin in direct proximity to unsaturated lipids, which are especially susceptible to lipid peroxidation, could be very important as far as their antioxidant activity is concerned. Therefore, the protective role of lutein against lipid peroxidation was investigated in membranes made of raft-forming mixtures and in models of photoreceptor outer segment membranes and compared with their antioxidant activity in homogeneous membranes composed of unsaturated lipids. Lipid peroxidation was induced by photosensitized reactions using rose Bengal and monitored by an MDA-TBA test, an iodometric assay, and oxygen consumption (using EPR spectroscopy and the mHCTPO spin label as an oxygen probe). The results show that lutein protects unsaturated lipids more effectively in membranes made of raft-forming mixtures than in homogeneous membranes. This suggests that the selective accumulation of macular xanthophylls in the most vulnerable regions of photoreceptor membranes may play an important role in enhancing their antioxidant properties and ability to prevent age-related macular diseases (such as age-related macular degeneration (AMD)).
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Nawrocki G, Grieb P, Górski A, Danielewicz R, Rowiński W. Prolongation of cardiac allograft survival in rats following combination treatment with 2-chloro-2'-deoxyadenosine and cyclosporine: a novel immunosuppressive strategy. Transplant Proc 1996; 28:3538-9. [PMID: 8962374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- G Nawrocki
- Maria Sklodowska-Curie Memorial Cancer Center, Warsaw Medical School, Poland
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Chmura A, Nawrocki G, Kwiatkowski A, Koselak M, Rowiński W, Płachta H. [Sultamicillin for prophylaxis of septic complications of gastric and enteric surgery]. Pol Tyg Lek 1993; 48 Suppl 2:13-5. [PMID: 8008660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- A Chmura
- Kliniki Chirurgii Ogólnej i Transplantacyjnej AM, Warszawie
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Walaszewski J, Rowinski W, Chmura A, Cajzner S, Kowalczyk J, Danielewicz R, Michalak G, Nawrocki G, Lazowski T, Zawadzki A. Decreased incidence of acute tubular necrosis after cadaveric donor transplantation due to lidocaine donor pretreatment and low-dose dopamine infusion in the recipient. Transplant Proc 1988; 20:913. [PMID: 3055532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Górski A, Chmura A, Rokicka-Milewska R, Wall W, Lagodziński Z, Glapinski T, Nawrocki G, Kobryń A, Rowiński W. Blood transfusion induces alterations in the circulation of immunoglobulin-secreting cells and activates helper T cells for Ig synthesis. Transplant Proc 1987; 19:1455. [PMID: 2978881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- A Górski
- Transplantation Institute, Department of Surgery, Warsaw
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