1,009 results match your criteria Acs Central Science[Journal]


Comparative Structural Analysis of 20S Proteasome Ortholog Protein Complexes by Native Mass Spectrometry.

ACS Cent Sci 2020 Apr 10;6(4):573-588. Epub 2020 Apr 10.

Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel.

Ortholog protein complexes are responsible for equivalent functions in different organisms. However, during evolution, each organism adapts to meet its physiological needs and the environmental challenges imposed by its niche. This selection pressure leads to structural diversity in protein complexes, which are often difficult to specify, especially in the absence of high-resolution structures. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00080DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181328PMC

Manganese-Doped, Lead-Free Double Perovskite Nanocrystals for Bright Orange-Red Emission.

ACS Cent Sci 2020 Apr 17;6(4):566-572. Epub 2020 Mar 17.

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China.

Lead-free halide perovskite nanocrystals (NCs) have recently attracted attention due to their nontoxicity and stability as alternatives to lead-based perovskite NCs. Here, we report undoped and manganese-doped all-inorganic, lead-free double perovskite (DP) NCs: CsNaIn Bi Cl (0 < < 1) and CsNaIn Bi Cl:Mn (0 ≤ ≤ 1) NCs. Undoped NCs exhibit blue emission. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00056DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181313PMC

Near-Infrared Light Responsive Nanoreactor for Simultaneous Tumor Photothermal Therapy and Carbon Monoxide-Mediated Anti-Inflammation.

ACS Cent Sci 2020 Apr 23;6(4):555-565. Epub 2020 Mar 23.

Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China.

Photothermal therapy (PTT) is an effective treatment modality with high selectivity for tumor suppression. However, the inflammatory responses caused by PTT may lead to adverse reactions including tumor recurrence and therapeutic resistance, which are regarded as major problems for PTT. Here, a near-infrared (NIR) light-responsive nanoreactor (P@DW/BC) is fabricated to simultaneously realize tumor PTT and carbon monoxide (CO)-mediated anti-inflammatory therapy. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01342DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181317PMC

Light-Activatable, 2,5-Disubstituted Tetrazoles for the Proteome-wide Profiling of Aspartates and Glutamates in Living Bacteria.

ACS Cent Sci 2020 Apr 13;6(4):546-554. Epub 2020 Apr 13.

Department of Chemistry, Technical University of Munich, Lichtenbergstrasse 4, Garching D-85747, Germany.

Covalent inhibitors have recently seen a resurgence of interest in drug development. Nevertheless, compounds, which do not rely on an enzymatic activity, have almost exclusively been developed to target cysteines. Expanding the scope to other amino acids would be largely facilitated by the ability to globally monitor their engagement by covalent inhibitors. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01268DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181327PMC

Unbiased Identification of the Liposome Protein Corona using Photoaffinity-based Chemoproteomics.

ACS Cent Sci 2020 Apr 1;6(4):535-545. Epub 2020 Apr 1.

Supramolecular and Biomaterials Chemistry, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.

Protein adsorption to the surface of a nanoparticle can fundamentally alter the character, behavior, and fate of a nanoparticle in vivo. Current methods to capture the protein corona rely on physical separation techniques and are unable to resolve key, individual protein-nanoparticle interactions. As a result, the precise link between the "synthetic" and the "biological" identity of a nanoparticle remains unclear. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01222DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181318PMC

Site-Selective and Rewritable Labeling of DNA through Enzymatic, Reversible, and Click Chemistries.

ACS Cent Sci 2020 Apr 27;6(4):525-534. Epub 2020 Mar 27.

School of Chemistry, University of Birmingham, Edgbaston, Birmingham, U.K., B15 2TT.

Current methods for bioconjugation rely on the introduction of stable linkers that lack the required versatility to perform sequential functionalizations. However, sequential manipulations are an increasing requirement in chemical biology because they can underpin multiple analyses of the same sample to provide a wider understanding of cell behavior. Here, we present a new method to site-selectively , , and chemical functionality to a biomolecule, DNA in this case. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01023DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181315PMC

Accurate Multiobjective Design in a Space of Millions of Transition Metal Complexes with Neural-Network-Driven Efficient Global Optimization.

ACS Cent Sci 2020 Apr 11;6(4):513-524. Epub 2020 Mar 11.

Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

The accelerated discovery of materials for real world applications requires the achievement of multiple design objectives. The multidimensional nature of the search necessitates exploration of multimillion compound libraries over which even density functional theory (DFT) screening is intractable. Machine learning (e. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00026DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181321PMC

Trace Ethylene Sensing via Wacker Oxidation.

ACS Cent Sci 2020 Apr 18;6(4):507-512. Epub 2020 Mar 18.

Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Ethylene is a dynamic plant hormone, and its temporal monitoring can be used to glean insight into plant health and status. However, the real-time distributed detection of ethylene at trace levels under ambient conditions remains a challenge. We report a single-walled carbon nanotube-based chemiresistor catalyst combination that can detect ppb levels of ethylene in air. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00022DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181324PMC

Emergence of Ferrichelatase Activity in a Siderophore-Binding Protein Supports an Iron Shuttle in Bacteria.

ACS Cent Sci 2020 Apr 9;6(4):493-506. Epub 2020 Mar 9.

Department of Chemistry, Washington University in St. Louis, One Brookings Drive, St. Louis, Missouri 63130, United States.

Siderophores are small-molecule high-affinity multidentate chelators selective for ferric iron that are produced by pathogenic microbes to aid in nutrient sequestration and enhance virulence. In Gram-positive bacteria, the currently accepted paradigm in siderophore-mediated iron acquisition is that effluxed metal-free siderophores extract ferric iron from biological sources and the resulting ferric siderophore complex undergoes diffusion-controlled association with a surface-displayed siderophore-binding protein (SBP) followed by ABC permease-mediated translocation across the cell envelope powered by ATP hydrolysis. Here we show that a more efficient paradigm is possible in Gram-positive bacteria where extracellular metal-free siderophores associate directly with -SBPs on the cell surface and serve as non-covalent cofactors that enable the -SBPs to non-reductively extract ferric iron directly from host metalloproteins with so-called "ferrichelatase" activity. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01257DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181320PMC

Ionic Fluorogels for Remediation of Per- and Polyfluorinated Alkyl Substances from Water.

ACS Cent Sci 2020 Apr 27;6(4):487-492. Epub 2020 Feb 27.

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

Per- and polyfluorinated alkyl substances (PFASs) contaminate groundwater, surface water, and finished drinking water internationally. Their ecological persistence and adverse human health effects demand effective remediation approaches. Motivated by the limitations in selectivity and performance of current PFAS removal technologies, we report a platform approach for the development of ionic fluorogel resins that effectively remove a chemically diverse mixture of PFAS from water. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01224DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181326PMC

Live-Cell Imaging and Quantification of PolyQ Aggregates by Stimulated Raman Scattering of Selective Deuterium Labeling.

Authors:
Kun Miao Lu Wei

ACS Cent Sci 2020 Apr 6;6(4):478-486. Epub 2020 Mar 6.

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.

Polyglutamine (polyQ) diseases are a group of neurodegenerative disorders, involving the deposition of aggregation-prone proteins with long polyQ expansions. However, the cytotoxic roles of these aggregates remain highly controversial, largely due to a lack of proper tools for quantitative and nonperturbative interrogations. Common methods including biochemical, spectroscopic assays, and live-cell fluorescence imaging all suffer from certain limitations. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01196DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181319PMC

Turn and Face the Strange: A New View on Phosphatases.

Authors:
Maja Köhn

ACS Cent Sci 2020 Apr 13;6(4):467-477. Epub 2020 Mar 13.

Faculty of Biology, Institute of Biology III, University of Freiburg, Schänzlestraße 18, 79104, Freiburg, Germany.

Phosphorylation as a post-translational modification is critical for cellular homeostasis. Kinases and phosphatases regulate phosphorylation levels by adding or removing, respectively, a phosphate group from proteins or other biomolecules. Imbalances in phosphorylation levels are involved in a multitude of diseases. Read More

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http://dx.doi.org/10.1021/acscentsci.9b00909DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181316PMC

Balancing Multiple Goals and Making It Work for Materials Research.

Authors:
Paulette Clancy

ACS Cent Sci 2020 Apr 1;6(4):464-466. Epub 2020 Apr 1.

Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00334DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181308PMC

Picking Flowers with Carbon Nanotube Sensors.

ACS Cent Sci 2020 Apr 3;6(4):461-463. Epub 2020 Apr 3.

Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00321DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181307PMC

Raman Imaging Shines a Light on Neurodegenerative Disorders.

Authors:
De-En Sun Xing Chen

ACS Cent Sci 2020 Apr 25;6(4):459-460. Epub 2020 Mar 25.

College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

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http://dx.doi.org/10.1021/acscentsci.0c00267DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181325PMC

Grab 'n Go: Siderophore-Binding Proteins Provide Pathogens a Quick Fix to Satisfy Their Hunger for Iron.

ACS Cent Sci 2020 Apr 17;6(4):456-458. Epub 2020 Mar 17.

Department of Chemistry, Duke University, Durham, North Carolina 27708-0346, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00179DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181309PMC

Fighting PFAS with PFAS.

ACS Cent Sci 2020 Apr 27;6(4):453-455. Epub 2020 Feb 27.

Department of Chemical and Biomolecular Engineering, Rice University, MS-362, 6100 Main Street, Houston, Texas 77005, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00164DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181314PMC

Powering Human Settlements in Space.

Authors:
Tien Nguyen

ACS Cent Sci 2020 Apr 13;6(4):450-452. Epub 2020 Apr 13.

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http://dx.doi.org/10.1021/acscentsci.0c00382DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181311PMC

A Conversation with Kerri Pratt.

Authors:
Deirdre Lockwood

ACS Cent Sci 2020 Apr 14;6(4):448-449. Epub 2020 Apr 14.

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http://dx.doi.org/10.1021/acscentsci.0c00379DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181312PMC

Multicolor Polymeric Nanoparticle Neuronal Tracers.

ACS Cent Sci 2020 Mar 24;6(3):436-445. Epub 2020 Feb 24.

Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.

Deciphering the targets of axonal projections plays a pivotal role in interpreting neuronal function and pathology. Neuronal tracers are indispensable tools for uncovering the functions and interactions between different subregions of the brain. However, the selection of commercially available neuronal tracers is limited, currently comprising small molecule dyes, viruses, and a handful of synthetic nanoparticles. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00027DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099585PMC

Catalysis-Enabled Access to Cryptic Geldanamycin Oxides.

ACS Cent Sci 2020 Mar 24;6(3):426-435. Epub 2020 Feb 24.

Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.

Catalytic, selective modifications of natural products can be a fertile platform for not only unveiling new natural product analogues with altered biological activity, but also for revealing new reactivity and selectivity hierarchies for embedded functional groups in complex environments. Motivated by these intersecting aims, we report site- and stereoselective oxidation reactions of geldanamycin facilitated by aspartyl-peptide catalysts. Through the isolation and characterization of four new geldanamycin oxides, we discovered a synergistic effect between lead peptide-based catalysts and geldanamycin, resulting in an unexpected reaction pathway. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00024DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099596PMC

What Is Special about Aromatic-Aromatic Interactions? Significant Attraction at Large Horizontal Displacement.

ACS Cent Sci 2020 Mar 2;6(3):420-425. Epub 2020 Mar 2.

Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade 11000, Serbia.

High-level calculations show that the most stable stacking for benzene-cyclohexane is 17% stronger than that for benzene-benzene. However, as these systems are displaced horizontally the benzene-benzene attraction retains its strength. At a displacement of 5. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099588PMC

Bottlebrush Bridge between Soft Gels and Firm Tissues.

ACS Cent Sci 2020 Mar 22;6(3):413-419. Epub 2020 Jan 22.

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, United States.

Softness and firmness are seemingly incompatible traits that synergize to create the unique soft-yet-firm tactility of living tissues pursued in soft robotics, wearable electronics, and plastic surgery. This dichotomy is particularly pronounced in tissues such as fat that are known to be both ultrasoft and ultrafirm. However, synthetically replicating this mechanical response remains elusive since ubiquitously employed soft gels are unable to concurrently reproduce tissue firmness. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01216DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099586PMC

Redox-Responsive Polycondensate Neoepitope for Enhanced Personalized Cancer Vaccine.

ACS Cent Sci 2020 Mar 3;6(3):404-412. Epub 2020 Feb 3.

Institute of Materials Science and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.

A versatile and highly effective platform remains a major challenge in the development of personalized cancer vaccines. Here, we devised a redox-responsive polycondensate neoepitope (PNE) through a reversible polycondensation reaction of peptide neoantigens and adjuvants together with a tracelessly responsive linker-monomer. Peptide-based neoantigens with diverse sequences and structures could be copolymerized with molecular adjuvants to form PNEs of high loading capacity for vaccine delivery without adding any carriers. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01174DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099592PMC

Computational Design of an Allosteric Antibody Switch by Deletion and Rescue of a Complex Structural Constellation.

ACS Cent Sci 2020 Mar 11;6(3):390-403. Epub 2020 Mar 11.

Program in Molecular Therapeutics, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, United States.

Therapeutic monoclonal antibodies have transformed medicine, especially with regards to treating cancers and disorders of the immune system. More than 50 antibody-derived drugs have already reached the clinic, the majority of which target cytokines or cell-surface receptors. Unfortunately, many of these targets have pleiotropic functions: they serve multiple different roles, and often not all of these roles are disease-related. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01065DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099597PMC

Glycoengineering of Natural Killer Cells with CD22 Ligands for Enhanced Anticancer Immunotherapy.

ACS Cent Sci 2020 Mar 5;6(3):382-389. Epub 2020 Mar 5.

Departments of Chemistry and Biomedical Engineering, Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States.

Adoptive transfer of immune cells is being actively pursued for cancer treatment. Natural killer (NK) cells, a class of cytotoxic immune cells, generally lack inherent selectivities toward cancer. To bestow tumor-targeting abilities and enhance anticancer efficacy, a new strategy is established to glycoengineer NK cells. Read More

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http://dx.doi.org/10.1021/acscentsci.9b00956DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099595PMC

MOrPH-PhD: An Integrated Phage Display Platform for the Discovery of Functional Genetically Encoded Peptide Macrocycles.

ACS Cent Sci 2020 Mar 4;6(3):368-381. Epub 2020 Feb 4.

Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.

Macrocyclic peptides represent attractive scaffolds for targeting protein-protein interactions, making methods for the diversification and functional selection of these molecules highly valuable for molecular discovery purposes. Here, we report the development of a novel strategy for the generation and high-throughput screening of combinatorial libraries of macrocyclic peptides constrained by a nonreducible thioether bridge. In this system, spontaneous, posttranslational peptide cyclization by means of a cysteine-reactive noncanonical amino acid was integrated with M13 bacteriophage display, enabling the creation of genetically encoded macrocyclic peptide libraries displayed on phage particles. Read More

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http://dx.doi.org/10.1021/acscentsci.9b00927DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099587PMC

Hierarchy in Metal-Organic Frameworks.

ACS Cent Sci 2020 Mar 10;6(3):359-367. Epub 2020 Mar 10.

Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States.

Sequence-defined nucleic acids and proteins with internal monomer sequences and arrangement are vital components in the living world, as a result of billions of years of molecular evolution. These natural hierarchical systems have inspired researchers to develop artificial hierarchical materials that can mimic similar functions such as replication, recognition, and information storage. In this Outlook, we describe the conceptual introduction of hierarchy into the design of metal-organic framework (MOF) materials. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00158DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099594PMC

The Future of Molecular Machines.

Authors:
Ivan Aprahamian

ACS Cent Sci 2020 Mar 3;6(3):347-358. Epub 2020 Mar 3.

6128 Burke Laboratory, Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States.

Artificial molecular machines have captured the imagination of scientists and nonscientists alike for decades now, given their clear potential to transform and enhance all aspects of human life. In this Outlook, I use a bicycle as an analogy to explain what a molecular machine is, in my opinion, and work through a representative selection of case studies to specify the significant accomplishments made to date, and the obstacles that currently stand between these and the field's fulfillment of its great potential. The hope of this intentionally sober account is to sketch a path toward a rich and exciting research trajectory that might challenge current practitioners and attract junior scientists into its fold. Read More

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http://dx.doi.org/10.1021/acscentsci.0c00064DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099591PMC

Multifunctional Pure MXene Fiber from Liquid Crystals of Only Water and MXene.

Authors:
Michael Naguib

ACS Cent Sci 2020 Mar 6;6(3):344-346. Epub 2020 Mar 6.

Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00180DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099583PMC

Fusing Antigens and Adjuvants into Traceless Nanogels.

Authors:
Bruno G De Geest

ACS Cent Sci 2020 Mar 6;6(3):342-343. Epub 2020 Mar 6.

Department of Pharmaceutics, Ghent University, 9000 Ghent, Belgium.

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http://dx.doi.org/10.1021/acscentsci.0c00098DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099584PMC

Toward Artificial Tissues That Are Both Soft and Firm.

ACS Cent Sci 2020 Mar 10;6(3):339-341. Epub 2020 Mar 10.

Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States.

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http://dx.doi.org/10.1021/acscentsci.0c00137DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099590PMC

Genetically Encoded Cyclic Peptide Phage Display Libraries.

ACS Cent Sci 2020 Mar 24;6(3):336-338. Epub 2020 Feb 24.

Department of Chemistry-BMC, Uppsala University, Uppsala 751 23, Sweden.

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http://dx.doi.org/10.1021/acscentsci.0c00087DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099589PMC

Plasmonic Color Makes a Comeback.

Authors:
Rachel Brazil

ACS Cent Sci 2020 Mar 16;6(3):332-335. Epub 2020 Mar 16.

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http://dx.doi.org/10.1021/acscentsci.0c00259DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099593PMC

A Conversation with Xiaogang Liu.

Authors:
XiaoZhi Lim

ACS Cent Sci 2020 Mar 13;6(3):313-314. Epub 2020 Mar 13.

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http://dx.doi.org/10.1021/acscentsci.0c00258DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7099611PMC

Inhomogeneity of Interfacial Electric Fields at Vibrational Probes on Electrode Surfaces.

ACS Cent Sci 2020 Feb 3;6(2):304-311. Epub 2020 Feb 3.

Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States.

Electric fields control chemical reactivity in a wide range of systems, including enzymes and electrochemical interfaces. Characterizing the electric fields at electrode-solution interfaces is critical for understanding heterogeneous catalysis and associated energy conversion processes. To address this challenge, recent experiments have probed the response of the nitrile stretching frequency of 4-mercaptobenzonitrile (4-MBN) attached to a gold electrode to changes in the solvent and applied electrode potential. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01297DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047426PMC
February 2020

Observation of the Unbiased Conformers of Putative DNA-Scaffold Ribosugars.

ACS Cent Sci 2020 Feb 18;6(2):293-303. Epub 2020 Feb 18.

Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Campus de Leioa, Ap. 644, 48080 Bilbao, Spain.

The constitution, configuration, and flexibility of the core sugars of DNA molecules alter their function in diverse roles. Conformational itineraries of the ribofuranosides (s) have long been known to finely determine rates of processing, yet we also know that, strikingly, semifunctional DNAs containing pyranosides (s) or other configurations can be created, suggesting sufficient but incompletely understood plasticity. The multiple conformers involved in such processes are necessarily influenced by context and environment: solvent, hosts, ligands. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01277DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047431PMC
February 2020

Catalytic Chemoselective -Phosphorylation of Alcohols.

ACS Cent Sci 2020 Feb 22;6(2):283-292. Epub 2020 Jan 22.

Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Phosphorylation of alcohols is a fundamentally important reaction in both life science and physical science. Product phosphate monoesters play key roles in living organisms, natural products, pharmaceuticals, and organic materials. Most of the chemical methods to date for synthesizing phosphate monoesters, however, require multistep sequences or are limited to specific types of substrates possibly due to harsh conditions. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01272DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047436PMC
February 2020

Enhancing the Signaling of GPCRs via Orthosteric Ions.

ACS Cent Sci 2020 Feb 23;6(2):274-282. Epub 2020 Jan 23.

Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

G protein-coupled receptors play essential roles in cellular processes such as neuronal signaling, vision, olfaction, tasting, and metabolism. As GPCRs are the most important drug targets, understanding their interactions with ligands is of utmost importance for discovering related new medicines. In many GPCRs, an allosteric sodium ion next to the highly conserved residue D has been proposed to stabilize the inactive receptor state by mediating interactions between transmembrane helices. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01247DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047428PMC
February 2020

Triggered Transience of Plastic Materials by a Single Electron Transfer Mechanism.

ACS Cent Sci 2020 Feb 5;6(2):266-273. Epub 2020 Feb 5.

Beckman Institute for Advanced Science and Technology, Department of Chemistry, Department of Chemical and Biomolecular Engineering, and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Transient polymers rapidly and controllably depolymerize in response to a specific trigger, typically by a chain-end unzipping mechanism. Triggers, such as heat, light, and chemical stimuli, are generally dependent on the chemistry of the polymer backbone or end groups. Single electron transfer (SET), in contrast to other triggering mechanisms, is achievable by various means including chemical, electrochemical, and photochemical oxidation or reduction. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01237DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047432PMC
February 2020

Additive-Free MXene Liquid Crystals and Fibers.

ACS Cent Sci 2020 Feb 6;6(2):254-265. Epub 2020 Feb 6.

A. J. Drexel Nanomaterials Institute, Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.

The discovery of liquid crystalline (LC) phases in dispersions of two-dimensional (2D) materials has enabled the development of macroscopically aligned three-dimensional (3D) macrostructures. Here, we report the first experimental observation of self-assembled LC phases in aqueous TiCT MXene inks without using LC additives, binders, or stabilizing agents. We show that the transition concentration from the isotropic to nematic phase is influenced by the aspect ratio of MXene flakes. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01217DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047439PMC
February 2020

Tracking and Visualization of Functional Domains in Stratified Metal-Organic Frameworks Using Gold Nanoparticles.

ACS Cent Sci 2020 Feb 22;6(2):247-253. Epub 2020 Jan 22.

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China.

We report here a new technique for the identification and visualization of functional domains in stratified metal-organic frameworks (MOFs). The technique, namely, gold diffusion enabled domain identification, utilizes the diffusion of Au nanoparticles within MOF cavities to track and selectively stain the more Au-philic domain in an MOF particle thereby allowing direct observation of domains, determination of domain sequences, and, in certain cases, domain boundaries under transmission electron microscopy. This method is an excellent tool for studying MOF materials with complex domain hierarchy. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01205DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047430PMC
February 2020

Competitive Metabolite Profiling of Natural Products Reveals Subunit Specific Inhibitors of the 20S Proteasome.

ACS Cent Sci 2020 Feb 21;6(2):241-246. Epub 2020 Jan 21.

Department of Chemistry, Zukunftskolleg, Konstanz Research School Chemical Biology, University of Konstanz, 78457 Konstanz, Germany.

We have developed a syringolin-based chemical probe and explored its utility for the profiling of metabolite extracts as potent inhibitors of the 20S proteasome. Activity-guided fractionation by competitive labeling allowed us to isolate and identify glidobactin A and C as well as luminmycin A from a Burkholderiales strain. The natural products exhibited unique subunit specificities for the proteolytic subunits of human and mouse constitutive and immunoproteasome in the lower nanomolar range. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01170DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047272PMC
February 2020

Revisiting the NaNiMnO Cathode: Oxygen Redox Chemistry and Oxygen Release Suppression.

ACS Cent Sci 2020 Feb 29;6(2):232-240. Epub 2020 Jan 29.

Institute of New Energy for Vehicles, Shanghai Key Laboratory for Development and Application of Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China.

Sodium layered transition metal oxides have been considered as promising cathode materials for sodium ion batteries due to their large capacity and high operating voltage. However, mechanism investigations of chemical evolution and capacity failure at high voltage are inadequate. As a representative cathode, NaNiMnO, the capacity contribution at a 4. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01166DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047265PMC
February 2020

Synthesis of Phospho-Amino Acid Analogues as Tissue Adhesive Cement Additives.

ACS Cent Sci 2020 Feb 11;6(2):226-231. Epub 2020 Feb 11.

Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden.

In this paper we report the synthesis of a library of phospho-amino acid analogues, via a novel single-step allyl-phosphoester protection/Pd-mediated deprotection strategy. These phosphoserine and phosphotyrosine analogues were then applied as additives to create adhesive calcium phosphate cements, allowing us to probe the chemical origins of the increased surface binding strength. We demonstrate the importance of multiple calcium binding motifs in mediating adhesion, as well as highlighting the crucial role played by substrate hydrophobicity and orientation in controlling binding strength. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047273PMC
February 2020

A Novel G Protein-Biased and Subtype-Selective Agonist for a G Protein-Coupled Receptor Discovered from Screening Herbal Extracts.

ACS Cent Sci 2020 Feb 23;6(2):213-225. Epub 2020 Jan 23.

iHuman Institute, ShanghaiTech University, Shanghai 201210, China.

Subtype selectivity and functional bias are vital in current drug discovery for G protein-coupled receptors (GPCRs) as selective and biased ligands are expected to yield drug leads with optimal on-target benefits and minimal side-effects. However, structure-based design and medicinal chemistry exploration remain challenging in part because of highly conserved binding pockets within subfamilies. Herein, we present an affinity mass spectrometry approach for screening herbal extracts to identify active ligands of a GPCR, the 5-HT receptor. Read More

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http://dx.doi.org/10.1021/acscentsci.9b01125DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7047268PMC
February 2020