1
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Salazar Marcano DE, Savić ND, Declerck K, Abdelhameed SAM, Parac-Vogt TN. Reactivity of metal-oxo clusters towards biomolecules: from discrete polyoxometalates to metal-organic frameworks. Chem Soc Rev 2024; 53:84-136. [PMID: 38015569 DOI: 10.1039/d3cs00195d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Metal-oxo clusters hold great potential in several fields such as catalysis, materials science, energy storage, medicine, and biotechnology. These nanoclusters of transition metals with oxygen-based ligands have also shown promising reactivity towards several classes of biomolecules, including proteins, nucleic acids, nucleotides, sugars, and lipids. This reactivity can be leveraged to address some of the most pressing challenges we face today, from fighting various diseases, such as cancer and viral infections, to the development of sustainable and environmentally friendly energy sources. For instance, metal-oxo clusters and related materials have been shown to be effective catalysts for biomass conversion into renewable fuels and platform chemicals. Furthermore, their reactivity towards biomolecules has also attracted interest in the development of inorganic drugs and bioanalytical tools. Additionally, the structural versatility of metal-oxo clusters allows for the efficiency and selectivity of the biomolecular reactions they promote to be readily tuned, thereby providing a pathway towards reaction optimization. The properties of the catalyst can also be improved through incorporation into solid supports or by linking metal-oxo clusters together to form Metal-Organic Frameworks (MOFs), which have been demonstrated to be powerful heterogeneous catalysts. Therefore, this review aims to provide a comprehensive and critical analysis of the state of the art on biomolecular transformations promoted by metal-oxo clusters and their applications, with a particular focus on structure-activity relationships.
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Affiliation(s)
| | - Nada D Savić
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
| | - Kilian Declerck
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
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2
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Materon IC, Palzkill T. Structural biology of MCR-1-mediated resistance to polymyxin antibiotics. Curr Opin Struct Biol 2023; 82:102647. [PMID: 37399693 PMCID: PMC10527939 DOI: 10.1016/j.sbi.2023.102647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/30/2023] [Accepted: 06/07/2023] [Indexed: 07/05/2023]
Abstract
Polymyxins, a last resort antibiotic, target the outer membrane of pathogens and are used to address the increasing prevalence of multidrug-resistant Gram-negative bacteria. The plasmid-encoded enzyme MCR-1 confers polymyxin resistance to bacteria by modifying the outer membrane. Transferable resistance to polymyxins is a major concern; therefore, MCR-1 is an important drug target. In this review, we discuss recent structural and mechanistic aspects of MCR-1 function, its variants and homologs, and how they are relevant to polymyxin resistance. Specifically, we discuss work on polymyxin-mediated disruption of the outer and inner membranes, computational studies on the catalytic mechanism of MCR-1, mutagenesis and structural analysis concerning residues important for substrate binding in MCR-1, and finally, advancements in inhibitors targeting MCR-1.
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Affiliation(s)
- Isabel Cristina Materon
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Timothy Palzkill
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX 77030, USA.
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3
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Biswas S, Chowdhury T, Dutta K, Saha S, Das D. Biochemical Resistivity against Free Radicals and Microbes: Cooperative Action of Zn(II)/Imidazole in Phosphoesterase-Mediated Cell Death. ACS APPLIED BIO MATERIALS 2023; 6:3278-3290. [PMID: 37565455 DOI: 10.1021/acsabm.3c00365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
This work delivers a targeted synthesis of four isostructural O-substituted imidazole-based zinc(II) complexes, namely, [Zn2(L1)2(I)2](DMF) (1), [Zn2(L2)2(I)2](DMF) (2), [Zn2(L1)2(Br)2] (3), and [Zn2(L2)2(Br)2] (4), derived from homologous Schiff-base ligands HL1 and HL2 to explore their impact on free radicals, microbes, and dephosphorylation of phosphoesters. The antioxidant activity of all complexes was checked by various radical scavenging assays (ABTS+•, DPPH•, and H2O2 radical quenching). Among them, complex 2 showed superior radical quenching activity, as indicated by its lowest EC50 value and thus maximum antioxidative capability. Again, antibacterial assays against several Gram-positive and Gram-negative bacteria were conducted to evaluate the zone of inhibition. The minimum bactericidal concentration and minimum inhibitory concentration values from the microdilution method for all complexes revealed complex 3 to have maximum potency against Gram-positive bacteria. The P-O bond hydrolysis in the phospholipid chain caused by the hydrolytic phosphoesterase activity of the Zn(II)-complexes plays a crucial role in cell membrane rupture. A model substrate 4-PNPP was used to explain the potency of monomeric Zn(II) complex (3) for cell penetration over dimeric one (2) with a proper mechanism. Furthermore, a heme model substrate, Fe(TPP)Cl, has been introduced with the most potent complex 3 and has spectrophotometric evidence for covalent interaction with imidazole and Fe(III) that can disrupt the nitric oxide dioxygenase function of flavohemoglobin, leading to bacterial cell death. To our knowledge, this is the first case to report a novel mechanism of antimicrobial action where both the metal and the ligand are cooperatively involved in bacterial cell death. The main goal of this work is to invent multifunctional therapeutics as well as the proper chemical rationalization of biological processes using mechanistic approaches, which includes investigating the roles of halides, imidazoles, and solution-phase structural variations of complexes..
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Affiliation(s)
- Sneha Biswas
- Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Tania Chowdhury
- Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Koushik Dutta
- Department of Polymer Science & Technology, University of Calcutta, 92, A.P.C. Road, Kolkata- 700009 West Bengal, India
| | - Sayan Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Debasis Das
- Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
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4
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Khakerwala Z, Kumar A, Makde RD. Crystal structure of phosphate bound Acyl phosphatase mini-enzyme from Deinococcus radiodurans at 1Å resolution. Biochem Biophys Res Commun 2023; 671:153-159. [PMID: 37302289 DOI: 10.1016/j.bbrc.2023.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 05/31/2023] [Accepted: 06/01/2023] [Indexed: 06/13/2023]
Abstract
Acylphosphatase (Acp) is a hydrolase which specifically cleaves carboxyl-phosphate bond of intermediates of metabolic pathways. It is a small cytosolic enzyme found in both prokaryotic and eukaryotic organisms. Previous crystal structures of acylphosphatase from different organisms have provided insights into the active site but the complete understanding of substrate binding and catalytic mechanisms in acylphosphatase remain elusive. Here we report the crystal structure of phosphate bound acylphosphatase from a mesothermic bacterium, Deinococcus radiodurans (drAcp) at resolution of 1.0 Å. Our structural analysis shows how the terminal phosphate group of substrates is bound to the active site, highlighting the importance of arginine in substrate recognition, role of asparagine in mode of catalysis and shedding light on the reaction mechanism. Additionally, the protein can refold after thermal melting by gradually lowering the temperature. To further explore the dynamics of drAcp, molecular dynamics simulation of drAcp and homologs from thermophilic organisms were carried out which revealed similar root mean square fluctuation profile but drAcp showed comparatively higher fluctuations.
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Affiliation(s)
- Zeenat Khakerwala
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, Maharashtra, India; Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai, 400085, Maharashtra, India.
| | - Ashwani Kumar
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai, 400085, Maharashtra, India.
| | - Ravindra D Makde
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, Maharashtra, India; Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai, 400085, Maharashtra, India.
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5
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Hosseinzadeh M, Sanz S, van Leusen J, Izarova NV, Brechin EK, Dalgarno SJ, Kögerler P. Controlled Hydrolysis of Phosphate Esters: A Route to Calixarene-Supported Rare-Earth Clusters. Chemistry 2023; 29:e202203525. [PMID: 36453613 DOI: 10.1002/chem.202203525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 11/30/2022] [Accepted: 12/01/2022] [Indexed: 12/05/2022]
Abstract
Phosphate ester bonds are widely present in nature (e. g. DNA/RNA) and can be extremely stable against hydrolysis without the help of catalysts. Previously, we showed how the combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO ) allows isolation of single lanthanide (Ln) metal ions as [LnIII (LPO )2 ](O3 SCF3 )3 . Here we report how by controlling the reaction conditions a new hydrolyzed phosphoryl-calix[4]arene ligand (H3 LHPO ) is formed as a result of LnIII -mediated P-OEt bond cleavage in three out of the eight possible sites in LPO . The chelating nature of H3 LHPO traps the LnIII species in the form of [LnIII (LHPO )((EtO)2 P(O)OH)]2 dimers (Ln=La, Dy, Tb, Gd), where the Dy derivative shows slow magnetization relaxation. The strategy presented herein could be extended to access a broader library of hydrolyzed platforms (Hx LHPO ; x=1-8) that may represent mimics of nuclease enzymes.
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Affiliation(s)
- Marjan Hosseinzadeh
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Sergio Sanz
- Peter Grünberg Institute, Electronic Properties (PGI-6) Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Jan van Leusen
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Natalya V Izarova
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, EH9 3FJ, Edinburgh, UK
| | - Scott J Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany.,Peter Grünberg Institute, Electronic Properties (PGI-6) Forschungszentrum Jülich, 52425, Jülich, Germany
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6
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Bihani SC, Nagar V, Kumar M. Mechanistic and evolutionary insights into alkaline phosphatase superfamily through structure-function studies on Sphingomonas alkaline phosphatase. Arch Biochem Biophys 2023; 736:109524. [PMID: 36716801 DOI: 10.1016/j.abb.2023.109524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 12/20/2022] [Accepted: 01/20/2023] [Indexed: 01/28/2023]
Abstract
Alkaline phosphatases (APs), represented by E. coli AP (ECAP), employ an arginine residue to stabilize the phosphoryl group in the active site; whereas, AP from Sphingomonas (SPAP) shows a unique combination of substrate-binding residues; Thr89, Asn110, Lys171, and Arg173. Although such combination has been observed only in SPAP, these residues are present separately in different members of the AP superfamily. Here, we establish the presence of two distinct classes of APs; ECAP-type and SPAP-type. Bioinformatic analyses show that SPAP-type of APs are widely distributed in the bacterial kingdom. The role of active site residues in the catalytic mechanism has been delineated through a set of crystal structures reported here. These structures, representing different stages of the reaction pathway provide wealth of information for the catalytic mechanism. Despite critical differences in the substrate binding residues, SPAP follows a mechanism similar to that of ECAP-type of APs. Structure-based phylogenetic analysis suggests that SPAP and ECAP may have diverged very early during the evolution from a common ancestor. Moreover, it is proposed that the SPAP-type of APs are fundamental members of the AP superfamily and are more closely related to other members of the superfamily as compared to the ECAP-type of APs.
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Affiliation(s)
- Subhash C Bihani
- Protein Crystallography Section, Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India.
| | - Vandan Nagar
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India; Food Microbiology Group, Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Mukesh Kumar
- Protein Crystallography Section, Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
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7
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Onyido I, Obumselu OF, Egwuatu CI, Okoye NH. Solvent and solvation effects on reactivities and mechanisms of phospho group transfers from phosphate and phosphinate esters to nucleophiles. Front Chem 2023; 11:1176746. [PMID: 37179775 PMCID: PMC10172589 DOI: 10.3389/fchem.2023.1176746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/03/2023] [Indexed: 05/15/2023] Open
Abstract
Organophosphorus esters fulfil many industrial, agricultural, and household roles. Nature has deployed phosphates and their related anhydrides as energy carriers and reservoirs, as constituents of genetic materials in the form of DNA and RNA, and as intermediates in key biochemical conversions. The transfer of the phosphoryl (PO3) group is thus a ubiquitous biological process that is involved in a variety of transformations at the cellular level such as bioenergy and signals transductions. Significant attention has been paid in the last seven decades to understanding the mechanisms of uncatalyzed (solution) chemistry of the phospho group transfer because of the notion that enzymes convert the dissociative transition state structures in the uncatalyzed reactions into associative ones in the biological processes. In this regard, it has also been proposed that the rate enhancements enacted by enzymes result from the desolvation of the ground state in the hydrophobic active site environments, although theoretical calculations seem to disagree with this position. As a result, some attention has been paid to the study of the effects of solvent change, from water to less polar solvents, in uncatalyzed phospho transfer reactions. Such changes have consequences on the stabilities of the ground and the transition states of reactions which affect reactivities and, sometimes, the mechanisms of reactions. This review seeks to collate and evaluate what is known about solvent effects in this domain, especially their effects on rates of reactions of different classes of organophosphorus esters. The outcome of this exercise shows that a systematized study of solvent effects needs to be undertaken to fully understand the physical organic chemistry of the transfer of phosphates and related molecules from aqueous to substantially hydrophobic environments, since significant knowledge gaps exist.
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8
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The Power of Biocatalysts for Highly Selective and Efficient Phosphorylation Reactions. Catalysts 2022. [DOI: 10.3390/catal12111436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Reactions involving the transfer of phosphorus-containing groups are of key importance for maintaining life, from biological cells, tissues and organs to plants, animals, humans, ecosystems and the whole planet earth. The sustainable utilization of the nonrenewable element phosphorus is of key importance for a balanced phosphorus cycle. Significant advances have been achieved in highly selective and efficient biocatalytic phosphorylation reactions, fundamental and applied aspects of phosphorylation biocatalysts, novel phosphorylation biocatalysts, discovery methodologies and tools, analytical and synthetic applications, useful phosphoryl donors and systems for their regeneration, reaction engineering, product recovery and purification. Biocatalytic phosphorylation reactions with complete conversion therefore provide an excellent reaction platform for valuable analytical and synthetic applications.
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9
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Lima MA, Rudd TR, Fernig DG, Yates EA. Phosphorylation and sulfation share a common biosynthetic pathway, but extend biochemical and evolutionary diversity of biological macromolecules in distinct ways. JOURNAL OF THE ROYAL SOCIETY, INTERFACE 2022; 19:20220391. [PMID: 35919982 PMCID: PMC9346353 DOI: 10.1098/rsif.2022.0391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Phosphate and sulfate groups are integral to energy metabolism and introduce negative charges into biological macromolecules. One purpose of such modifications is to elicit precise binding/activation of protein partners. The physico-chemical properties of the two groups, while superficially similar, differ in one important respect—the valency of the central (phosphorus or sulfur) atom. This dictates the distinct properties of their respective esters, di-esters and hence their charges, interactions with metal ions and their solubility. These, in turn, determine the contrasting roles for which each group has evolved in biological systems. Biosynthetic links exist between the two modifications; the sulfate donor 3′-phosphoadenosine-5′-phosphosulfate being formed from adenosine triphosphate (ATP) and adenosine phosphosulfate, while the latter is generated from sulfate anions and ATP. Furthermore, phosphorylation, by a xylosyl kinase (Fam20B, glycosaminoglycan xylosylkinase) of the xylose residue of the tetrasaccharide linker region that connects nascent glycosaminoglycan (GAG) chains to their parent proteoglycans, substantially accelerates their biosynthesis. Following observations that GAG chains can enter the cell nucleus, it is hypothesized that sulfated GAGs could influence events in the nucleus, which would complete a feedback loop uniting the complementary anionic modifications of phosphorylation and sulfation through complex, inter-connected signalling networks and warrants further exploration.
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Affiliation(s)
- M A Lima
- Centre for Glycosciences, Keele University, Keele ST5 5BG, UK.,School of Life Sciences, Keele University, Keele ST5 5BG, UK
| | - T R Rudd
- Analytical and Biological Science Department, National Institute of Biological Standards and Control (NIBSC), Blanche Lane, South Mimms, Potters Bar EN6 3QG, UK.,Department of Biochemistry and Systems Biology, ISMIB, University of Liverpool, Liverpool L69 7ZB, UK
| | - D G Fernig
- Department of Biochemistry and Systems Biology, ISMIB, University of Liverpool, Liverpool L69 7ZB, UK
| | - E A Yates
- School of Life Sciences, Keele University, Keele ST5 5BG, UK.,Department of Biochemistry and Systems Biology, ISMIB, University of Liverpool, Liverpool L69 7ZB, UK
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10
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Singh MM, Satija J. Enzyme-assisted metal nanoparticles etching based plasmonic ELISA: Progress and insights. Anal Biochem 2022; 654:114820. [PMID: 35850200 DOI: 10.1016/j.ab.2022.114820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 07/07/2022] [Accepted: 07/12/2022] [Indexed: 11/24/2022]
Abstract
The unique size and shape tunable localized surface plasmon resonance (LSPR) properties of the noble metal nanoparticle have been extensively exploited to realize a variety of enzyme-based optical biosensors. Although approaches like metal film deposition, nanoparticle aggregation, and synthesis & growth of metal nanoparticles are quite useful, metal nanoparticle etching-based biosensors offer greater sensitivity, selectivity, and stability against various environmental factors which makes this strategy easy to use for field applications. This review discusses the current state-of-art of plasmonic nanoparticle etching-based enzyme-linked immunosorbent assay (ELISA) realized for visual detection of various analytes. The naked eye detection, i.e. without any optical readout device, is the additional advantage of this sensing approach that reduces the analysis cost significantly making it feasible under resource-constrained settings. This review paper provides deeper insights into biocatalytic etching mechanisms of various plasmonic nanoparticles resulting in vivid color change as a function of analyte concentration. Although nanoparticle etching-based ELISA has huge potential, steps need to be taken to realize a point-of-care (POC) nanodiagnostic before its translation to a commercial technique or product that can be achieved in near future by integrating it with microfluidics technology and other technological avenues.
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Affiliation(s)
| | - Jitendra Satija
- Centre for Nanobiotechnology, VIT, Vellore, Tamil Nadu, 632014, India.
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11
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Schwartz G, Hananel U, Avram L, Goldbourt A, Markovich G. A Kinetic Isotope Effect in the Formation of Lanthanide Phosphate Nanocrystals. J Am Chem Soc 2022; 144:9451-9457. [PMID: 35594149 PMCID: PMC9189826 DOI: 10.1021/jacs.2c02424] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Mechanisms of nucleation and growth
of crystals are still attracting
a great deal of interest, in particular with recent advances in experimental
techniques aimed at studying such phenomena. Studies of kinetic isotope
effects in various reactions have been useful for elucidating reaction
mechanisms, and it is believed that the same may apply for crystal
formation kinetics. In this work, we present a kinetic study of the
formation of europium-doped terbium phosphate nanocrystals under acidic
conditions, including a strong H/D isotope effect. The nanocrystal
growth process could be quantitatively followed through monitoring
of the europium luminescence intensity. Hence, such lanthanide-based
nanocrystals may serve as unique model systems for studying crystal
nucleation and growth mechanisms. By combining the luminescence and
NMR kinetics data, we conclude that the observed delayed nucleation
occurs due to initial formation of pre-nucleation clusters or polymers
of the lanthanide and phosphate ions, which undergo a phase transformation
to crystal nuclei and further grow by cluster attachment. A scaling
behavior observed on comparison of the H2O and D2O-based pre-nucleation and nanocrystal growth kinetics led us to
conclude that both pre-nucleation and nanocrystal growth processes
are of similar chemical nature.
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Affiliation(s)
- Gal Schwartz
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Uri Hananel
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Liat Avram
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Amir Goldbourt
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Gil Markovich
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
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12
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Lakra J, Tikariha D, Kumar B. Significance of dimeric surfactant on kinetic study of organophosphorus compounds. INT J CHEM KINET 2022. [DOI: 10.1002/kin.21574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jyotsna Lakra
- Department of Chemistry APSGMNS Govt. P.G. College Kawardha Kawardha Chhattisgarh India
| | - Deepti Tikariha
- Department of Chemistry APSGMNS Govt. P.G. College Kawardha Kawardha Chhattisgarh India
| | - Birendra Kumar
- Department of Chemistry Govt. Rajmata Vijayaraje Sindhiya Kanya Mahavidyalaya Kawardha Kawardha Chhattisgarh India
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13
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Pfeiffer M, Crean RM, Moreira C, Parracino A, Oberdorfer G, Brecker L, Hammerschmidt F, Kamerlin SCL, Nidetzky B. Essential Functional Interplay of the Catalytic Groups in Acid Phosphatase. ACS Catal 2022; 12:3357-3370. [PMID: 35356705 PMCID: PMC8938923 DOI: 10.1021/acscatal.1c05656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/31/2022] [Indexed: 01/15/2023]
Abstract
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The cooperative interplay
between the functional devices of a preorganized
active site is fundamental to enzyme catalysis. An in-depth understanding
of this phenomenon is central to elucidating the remarkable efficiency
of natural enzymes and provides an essential benchmark for enzyme
design and engineering. Here, we study the functional interconnectedness
of the catalytic nucleophile (His18) in an acid phosphatase by analyzing
the consequences of its replacement with aspartate. We present crystallographic,
biochemical, and computational evidence for a conserved mechanistic
pathway via a phospho-enzyme intermediate on Asp18. Linear free-energy
relationships for phosphoryl transfer from phosphomonoester substrates
to His18/Asp18 provide evidence for the cooperative interplay between
the nucleophilic and general-acid catalytic groups in the wild-type
enzyme, and its substantial loss in the H18D variant. As an isolated
factor of phosphatase efficiency, the advantage of a histidine compared
to an aspartate nucleophile is ∼104-fold. Cooperativity
with the catalytic acid adds ≥102-fold to that advantage.
Empirical valence bond simulations of phosphoryl transfer from glucose
1-phosphate to His and Asp in the enzyme explain the loss of activity
of the Asp18 enzyme through a combination of impaired substrate positioning
in the Michaelis complex, as well as a shift from early to late protonation
of the leaving group in the H18D variant. The evidence presented furthermore
suggests that the cooperative nature of catalysis distinguishes the
enzymatic reaction from the corresponding reaction in solution and
is enabled by the electrostatic preorganization of the active site.
Our results reveal sophisticated discrimination in multifunctional
catalysis of a highly proficient phosphatase active site.
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Affiliation(s)
- Martin Pfeiffer
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12/I, 8010 Graz, Austria.,Austrian Centre of Industrial Biotechnology, Petersgasse 14, 8010 Graz, Austria
| | - Rory M Crean
- Department of Chemistry-BMC, Uppsala University, BMC Box 576, S-751 23 Uppsala, Sweden
| | - Catia Moreira
- Department of Chemistry-BMC, Uppsala University, BMC Box 576, S-751 23 Uppsala, Sweden
| | - Antonietta Parracino
- Department of Chemistry-BMC, Uppsala University, BMC Box 576, S-751 23 Uppsala, Sweden
| | - Gustav Oberdorfer
- Institute of Biochemistry, Graz University of Technology, NAWI Graz, Petersgasse 12/II, 8010 Graz, Austria
| | - Lothar Brecker
- Department of Organic Chemistry, University of Vienna, Währingerstraße 38, 1090 Vienna, Austria
| | - Friedrich Hammerschmidt
- Department of Organic Chemistry, University of Vienna, Währingerstraße 38, 1090 Vienna, Austria
| | | | - Bernd Nidetzky
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12/I, 8010 Graz, Austria.,Austrian Centre of Industrial Biotechnology, Petersgasse 14, 8010 Graz, Austria
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14
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Fu Y, Zhang Y, Fan F, Wang B, Cao Z. Degradation of pesticides diazinon and diazoxon by phosphotriesterase: insight into divergent mechanisms from QM/MM and MD simulations. Phys Chem Chem Phys 2022; 24:687-696. [PMID: 34927643 DOI: 10.1039/d1cp05034f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enzymatic hydrolysis by phosphotriesterase (PTE) is one of the most effective ways of degrading organophosphorus pesticides, but the catalytic efficiency depends on the structural features of substrates. Here the enzymatic degradation of diazinon (DIN) and diazoxon (DON), characterized by PS and PO, respectively, have been investigated by QM/MM calculations and MM MD simulations. Our calculations demonstrate that the hydrolysis of DON (with PO) is inevitably initiated by the nucleophilic attack of the bridging-OH- on the phosphorus center, while for DIN (with PS), we proposed a new degradation mechanism, initiated by the nucleophilic attack of the Znα-bound water molecule, for its low-energy pathway. For both DIN and DON, the hydrolytic reaction is predicted to be the rate-limiting step, with energy barriers of 18.5 and 17.7 kcal mol-1, respectively. The transportation of substrates to the active site, the release of the leaving group and the degraded product are generally verified to be favorable by MD simulations via umbrella sampling, both thermodynamically and dynamically. The side-chain residues Phe132, Leu271 and Tyr309 play the gate-switching role to manipulate substrate delivery and product release. In comparison with the DON-enzyme system, the degraded product of DIN is more easily released from the active site. These new findings will contribute to the comprehensive understanding of the enzymatic degradation of toxic organophosphorus compounds by PTE.
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Affiliation(s)
- Yuzhuang Fu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Yuwei Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Fangfang Fan
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
| | - Binju Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Zexing Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
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15
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Jeon H, Vazquez-Lima H, Jeong H, Cho KB, Hong S. Mono- and dinuclear zinc complexes bearing identical bis(thiosemicarbazone) ligand that exhibit alkaline phosphatase-like catalytic reactivity. J Biol Inorg Chem 2021; 27:37-47. [PMID: 34714402 DOI: 10.1007/s00775-021-01909-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 10/22/2021] [Indexed: 10/20/2022]
Abstract
Mono- and dinuclear zinc(II) complexes bearing bis(thiosemicarbazone) (bTSC) ligand were employed in the cleavage of phosphoester bonds. Comparative kinetic studies combined with theory suggested that the P-O bond cleavage is much accelerated by dinuclear zinc(II) complex in the presence of base. Based on the DFT-optimized structures of the proposed intermediates, it is plausible that (1) the removal of sulfur atoms of bTSC ligand from the zinc center provides two vacant sites for the binding of water (or hydroxide ion) and phosphoester and (2) the H-bonding between water (or hydroxide ion) and phosphoester, through several water molecules, may also assist the P-O bond cleavage and facilitate the nucleophilic attack. The kinetic and catalytic studies on the hydrolysis of phosphoester by dinuclear zinc complex showed a much-enhanced reactivity under basic reaction conditions, reaching over 95% conversion yield within 4 h. The currently presented compounds are arguably one of the faster synthetic Zn-based model performing phosphatase-like activity presented so far.
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Affiliation(s)
- Hyeri Jeon
- Department of Chemistry, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Hugo Vazquez-Lima
- Department of Chemistry, Jeonbuk National University, Jeonju, 54896, Republic of Korea.,Department of Inorganic Chemistry, Meritorious Autonomous University of Puebla, 72000, Puebla, Mexico
| | - Haewon Jeong
- Department of Chemistry, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Kyung-Bin Cho
- Department of Chemistry, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
| | - Seungwoo Hong
- Department of Chemistry, Sookmyung Women's University, Seoul, 04310, Republic of Korea.
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16
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Robertson AJ, Wilson AL, Burn MJ, Cliff MJ, Popelier PLA, Waltho JP. The Relationship between Enzyme Conformational Change, Proton Transfer, and Phosphoryl Transfer in β-Phosphoglucomutase. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Angus J. Robertson
- Department of Molecular Biology and Biotechnology, Krebs Institute for Biomolecular Research, The University of Sheffield, Sheffield S10 2TN, United Kingdom
| | - Alex L. Wilson
- Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, United Kingdom
| | - Matthew J. Burn
- Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, United Kingdom
| | - Matthew J. Cliff
- Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, United Kingdom
| | - Paul L. A. Popelier
- Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, United Kingdom
| | - Jonathan P. Waltho
- Department of Molecular Biology and Biotechnology, Krebs Institute for Biomolecular Research, The University of Sheffield, Sheffield S10 2TN, United Kingdom
- Department of Chemistry, Manchester Institute of Biotechnology, The University of Manchester, Manchester M1 7DN, United Kingdom
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17
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Guo YJ, Cui CX, Liu YJ. Theoretical Study on Storage and Release of Firefly Luciferin. Photochem Photobiol 2021; 98:184-192. [PMID: 34333799 DOI: 10.1111/php.13496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 07/29/2021] [Accepted: 07/29/2021] [Indexed: 11/29/2022]
Abstract
Among numerous bioluminescent organisms, firefly is the most studied one. Recent experiment proposed that sulfoluciferin (SLH2 ) may serve as a storage form of luciferin (LH2 ). In the present article, we employed density functional theory calculation to uncover the mechanism and detailed process of the storage and release reactions. Due to lack of available crystallographic structure of the related enzyme, the calculation was performed on a model system. For the storage reaction, possible amino acid residues were used for imitating the protein environment. For the release reaction, the dielectric constant of 3.0 was employed to simulate the polarity of the protein cavity. The computational results indicated that the reactions from LH2 to SLH2 and from SLH2 to LH2 are both exergonic, which favor the storage and release processes and coincide with the experimental observation. Basing on experimental and current theoretical study, we supplemented the stages of LH2 storage and release in the entire bioluminescent cycle of firefly. The current theoretical calculation could inspire the study on LH2 storage and release of other bioluminescent organisms.
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Affiliation(s)
- Ya-Jie Guo
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, China
| | - Cheng-Xing Cui
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, China
| | - Ya-Jun Liu
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, China.,Center for Advanced Materials Research, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai, China
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18
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Lanuza J, Sánchez González Á, Bandeira NAG, Lopez X, Gil A. Mechanistic Insights into Promoted Hydrolysis of Phosphoester Bonds by MoO 2Cl 2(DMF) 2. Inorg Chem 2021; 60:11177-11191. [PMID: 34270231 DOI: 10.1021/acs.inorgchem.1c01088] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A phosphoester bond is a crucial structural block in biological systems, whose occurrence is regulated by phosphatases. Molybdenum compounds have been reported to be active in phosphate ester hydrolysis of model phosphates. Specifically, MoO2Cl2(DMF)2 is active in the hydrolysis of para-nitrophenyl phosphate (pNPP), leading to heteropolyoxometalate structures. We use density functional theory (DFT) to clarify the mechanism by which these species promote the hydrolysis of the phosphoester bond. The present calculations give insight into several key aspects of this reaction: (i) the speciation of this complex prior to interaction with the phosphate (DMF release, Mo-Cl hydrolysis, and pH influence on the speciation), (ii) the competition between phosphate addition and the molybdate nucleation process, (iii) and the mechanisms by which some plausible active species promote this hydrolysis in different conditions. We described thoroughly two different pathways depending on the nucleation possibilities of the molybdenum complex: one mononuclear mechanism, which is preferred in conditions in which very low complex concentrations are used, and another dinuclear mechanism, which is preferred at higher concentrations.
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Affiliation(s)
- Jose Lanuza
- Polimero eta Material Aurreratuak, Kimika eta Teknologia Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain.,Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Ángel Sánchez González
- BioISI-Biosystems and Integrative Sciences Institute-Universidade de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 1749-016, Lisboa, Portugal
| | - Nuno A G Bandeira
- BioISI-Biosystems and Integrative Sciences Institute-Universidade de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 1749-016, Lisboa, Portugal
| | - Xabier Lopez
- Polimero eta Material Aurreratuak, Kimika eta Teknologia Saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain.,Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Adrià Gil
- BioISI-Biosystems and Integrative Sciences Institute-Universidade de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 1749-016, Lisboa, Portugal.,CIC nanoGUNE BRTA, Tolosa Hiribidea 76, E-20018 Donostia-San Sebastián, Euskadi, Spain
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19
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Silva VB, Campos RB, Pavez P, Medeiros M, Orth ES. Nucleophilic Neutralization of Organophosphates: Lack of Selectivity or Plenty of Versatility? CHEM REC 2021; 21:2638-2665. [PMID: 34117695 DOI: 10.1002/tcr.202100123] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/17/2021] [Indexed: 12/13/2022]
Abstract
Neutralization of organophosphates is an issue of public health and safety, involving agrochemicals and chemical warfare. A promising approach is the nucleophilic neutralization, scope of this review, which focuses on the molecular nucleophiles: hydroxide, imidazole derivatives, alpha nucleophiles, amines and other nucleophiles. A reactivity mapping is given correlating the pathways and reaction efficiency with structural dependence of the nucleophile (basicity) and the organophosphate (electrophilic centers, P=O/P=S shift, leaving and non-leaving group). Reactions extremely unfavorable (>20 years) can be reduced to seconds with various nucleophiles, some which are catalytic. Although there is no universal nucleophile, a lack of selectivity in some cases accounts for plenty of versatility in other reactions. The ideal neutralization requires a solid mechanistic understanding, together with balancing factors such as milder conditions, fast process, selectivity and less toxic products.
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Affiliation(s)
- Valmir B Silva
- Department of Chemistry, Universidade Federal do Paraná, CP 19081, CEP 81531-990, Curitiba, PR, Brazil
| | - Renan B Campos
- Academic Department of Chemistry and Biology, Universidade Tecnológica Federal do Paraná, ZIP 81280-340, Curitiba, PR, Brazil
| | - Paulina Pavez
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Casilla 306, 6094411, Santiago, Chile
| | - Michelle Medeiros
- Department of Chemistry, Universidade Federal de Santa Catarina, CEP 88040-900, Florianópolis, SC, Brazil
| | - Elisa S Orth
- Department of Chemistry, Universidade Federal do Paraná, CP 19081, CEP 81531-990, Curitiba, PR, Brazil
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20
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Zhu L, Yang H, Wong MW. Asymmetric Nucleophilic Allylation of α-Chloro Glycinate via Squaramide Anion-Abstraction Catalysis: SN1 or SN2 Mechanism, or Both? J Org Chem 2021; 86:8414-8424. [DOI: 10.1021/acs.joc.1c00839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lihan Zhu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Hui Yang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Ming Wah Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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21
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Wang Y, Yang L, Wang M, Zhang J, Qi W, Su R, He Z. Bioinspired Phosphatase-like Mimic Built from the Self-Assembly of De Novo Designed Helical Short Peptides. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00129] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yutong Wang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
| | - Lijun Yang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
| | - Mengfan Wang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China
| | - Jiaxing Zhang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
| | - Wei Qi
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
- The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China
| | - Rongxin Su
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
- The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China
| | - Zhimin He
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China
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22
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Yang Y, Chen P, Liu Y, Cai Z, Wang X, Me Y, Ding X, Lin L, Jiang H, Zhang Z, Ju Y. A colorimetric indicator-displacement assay based on stable Cu 2+ selective carbon dots for fluorescence turn-on detection of pyrophosphate anions in urine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 251:119479. [PMID: 33503563 DOI: 10.1016/j.saa.2021.119479] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 01/01/2021] [Accepted: 01/10/2021] [Indexed: 06/12/2023]
Abstract
Determination of PPi levels in urine represents a measurable factor for diagnostic, treatment, and monitoring of urolithiasis. Owing to the quenching ability of Cu2+ on fluorescent carbon dots (CDs) and strong binding affinity between Cu2+ and PPi, we develop a new off-on assay for PPi detection using newly BPHA CDs (BPHA: N,N-bis(pyridin-2-ylmethyl)hexan-1-amine). The fluorescence intensity of BPHA CDs was significantly quenched by Cu2+ ("off") through forming BPHA CDs/Cu2+ complexes and the fluorescence intensity of BPHA CDs /Cu2+ system was completely resumed by PPi ("on") owing to the release of free Cu2+. The fluorescence turn-off/on approach showed a highly selective response to PPi over the large family of other anions. The detection limits were 0.094 μM for Cu2+ and 0.025 μM for PPi, respectively. A wide linear range for PPi was up to 4400 μM. The indicator displacement assay (IDAs) using pyrocatechol violet (PV) as a colorimetric indicator was carried out to detect PPi with the naked eyes. The "off-on" fluorescent sensor based on BPHA CDs shows many merits, including convenient operation, cost-saving, high sensitivity, selectivity, stability and wide detecting range, which is applied to PPi detection in human urine sample.
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Affiliation(s)
- Yi Yang
- Changzhou Vocational Institute of Engineering, Changzhou 213164, China
| | - Pei Chen
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China; West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Yuqing Liu
- School of Basic Medical Sciences, Nanjing Medical University, Nanjing 211166, China; School of Medicine, Xiamen University, Xiamen 361005, China
| | - Zheng Cai
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Xiyao Wang
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Yang Me
- The First affiliated Hospital, Nanjing Medical University, Nanjing 211166, China
| | - Xiongyu Ding
- The First affiliated Hospital, Nanjing Medical University, Nanjing 211166, China
| | - Lan Lin
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Huijun Jiang
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Zhenqin Zhang
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Yichun Ju
- School of Pharmacy, Nanjing Medical University, Nanjing 211166, China.
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23
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Rahman AB, Okamoto H, Miyazawa Y, Aoki S. Design and Synthesis of Supramolecular Phosphatases Formed from a Bis(Zn
2+
‐Cyclen) Complex, Barbital‐Crown‐K
+
Conjugate and Cu
2+
for the Catalytic Hydrolysis of Phosphate Monoester. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Akib Bin Rahman
- Faculty of Pharmaceutical Science Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Hirokazu Okamoto
- Faculty of Pharmaceutical Science Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Yuya Miyazawa
- Faculty of Pharmaceutical Science Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Shin Aoki
- Faculty of Pharmaceutical Science Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
- Research Institute for Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
- Research Institute for Biomedical Sciences Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
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24
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Goldmeier MN, Katz S, Glaser F, Belakhov V, Khononov A, Baasov T. Toward Catalytic Antibiotics: Redesign of Fluoroquinolones to Catalytically Fragment Chromosomal DNA. ACS Infect Dis 2021; 7:608-623. [PMID: 33448785 DOI: 10.1021/acsinfecdis.0c00777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A library of ciprofloxacin-nuclease conjugates was designed and synthesized to investigate their potential as catalytic antibiotics. The Cu(II) complexes of the new designer compounds (i) showed excellent in vitro hydrolytic and oxidative DNase activity, (ii) showed good antibacterial activity against both Gram-negative and Gram-positive bacteria, and (iii) proved to be highly potent bacterial DNA gyrase inhibitors via a mechanism that involves stabilization of the fluoroquinolone-topoisomerase-DNA ternary complex. Furthermore, the Cu(II) complexes of two of the new designer compounds were shown to fragment supercoiled plasmid DNA into linear DNA in the presence of DNA gyrase, demonstrating a "proof of concept" in vitro. These ciprofloxacin-nuclease conjugates can therefore serve as models with which to develop next-generation, in vivo functioning catalytic antimicrobials.
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Affiliation(s)
- Moshe N. Goldmeier
- Edith and Joseph Fischer Enzyme Inhibitors Laboratory, Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa 3200003, Israel
| | - Sofya Katz
- Edith and Joseph Fischer Enzyme Inhibitors Laboratory, Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa 3200003, Israel
| | - Fabian Glaser
- The Lorry I. Lokey Interdisciplinary Center for Life Sciences and Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Valery Belakhov
- Edith and Joseph Fischer Enzyme Inhibitors Laboratory, Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa 3200003, Israel
| | - Alina Khononov
- Edith and Joseph Fischer Enzyme Inhibitors Laboratory, Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa 3200003, Israel
| | - Timor Baasov
- Edith and Joseph Fischer Enzyme Inhibitors Laboratory, Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa 3200003, Israel
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25
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Mou Z, Chen X, Wang C, Wang T, Yang H, Li Z. Nucleophilic 18F-fluorination of phosphorofluoridates and phosphonofluoridic acids via imidazole-activated precursors. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Kalu GI, Ubochi CI, Onyido I. Reactions of aryl dimethylphosphinothioate esters with anionic oxygen nucleophiles: transition state structure in 70% water-30% ethanol. RSC Adv 2021; 11:8833-8845. [PMID: 35423373 PMCID: PMC8695247 DOI: 10.1039/d0ra10759j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 02/03/2021] [Indexed: 11/21/2022] Open
Abstract
Aryl dimethylphosphinates, 2, react with anionic oxygen nucleophiles in water via a concerted (ANDN) mechanism. With EtO- in anhydrous ethanol, the mechanism is associative (AN + DN), with rate-limiting pentacoordinate intermediate formation. This change in mechanism with solvent change has been ascribed to changes in the nucleophile and leaving group basicities accompanying solvent change. This paper reports on a kinetic analysis of the reactions of the aryl dimethylphosphinothioates, 3a-g, with oxygen nucleophiles in 70% water-30% ethanol (v/v) solvent at 25 °C, reactions known to proceed by a concerted mechanism in water, to test the rationalization stated above, since the nucleophiles and LGs of interest are more basic in aqueous ethanol than in water. The change in solvent causes an ca. 14 to 320-fold decrease in rate. Hammett and Brønsted-type correlations characterize a concerted TS with less P-LG bonding in aqueous ethanol than in water. Two opposing consequences are associated with the solvent change: (a) increased basicity of nucleophiles and LGs, which lead to a modest tightening of the TS; and (b) better stabilization of the IS relative to the TS in aqueous ethanol, which results in a slower reaction with a more product-like TS. Hammond and anti-Hammond effects on the TS arising from better stabilization of the IS over the TS dominate over the effects of increased nucleophile and LG basicity in determining the looser TS structure in aqueous ethanol. An altered TS structure is consistent with an altered reaction potential energy surface, in this case caused by a change in solvent polarity.
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Affiliation(s)
- Georgina I Kalu
- Department of Chemistry, Imo State University Owerri Nigeria
| | | | - Ikenna Onyido
- Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University Awka Nigeria +234-806-268-5122
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27
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Pramanik SK, Das A. Small luminescent molecular probe for developing as assay for alkaline phosphatase. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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28
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Yam VW, Law AS. Recent advances in supramolecular
self‐assembly
and biological applications of luminescent alkynylplatinum(
II
) polypyridine complexes. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202000536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Vivian Wing‐Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry The University of Hong Kong, Pokfulam Road Hong Kong People's Republic of China
| | - Angela Sin‐Yee Law
- Institute of Molecular Functional Materials and Department of Chemistry The University of Hong Kong, Pokfulam Road Hong Kong People's Republic of China
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29
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Novak V, Khatri PK, Laursen KH. The oxygen isotopic signature of soil- and plant-derived sulphate is controlled by fertilizer type and water source. PLANT, CELL & ENVIRONMENT 2021; 44:203-215. [PMID: 32844439 DOI: 10.1111/pce.13877] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 08/19/2020] [Accepted: 08/20/2020] [Indexed: 06/11/2023]
Abstract
The oxygen isotope signature of sulphate (δ18 Osulphate ) is increasingly used to study nutritional fluxes and sulphur transformation processes in a variety of natural environments. However, mechanisms controlling the δ18 Osulphate signature in soil-plant systems are largely unknown. The objective of this study was to determine key factors, which affect δ18 Osulphate values in soil and plants. The impact of an 18 O-water isotopic gradient and different types of fertilizers was investigated in a soil incubation study and a radish (Raphanus sativus L.) greenhouse growth experiment. Water provided 31-64% of oxygen atoms in soil sulphate formed via mineralization of organic residues (green and chicken manures) while 49% of oxygen atoms were derived from water during oxidation of elemental sulphur. In contrast, δ18 Osulphate values of synthetic fertilizer were not affected by soil water. Correlations between soil and plant δ18 Osulphate values were controlled by water δ18 O values and fertilizer treatments. Additionally, plant δ34 S data showed that the sulphate isotopic composition of plants is a function of S assimilation. This study documents the potential of using compound-specific isotope ratio analysis for investigating and tracing fertilization strategies in agricultural and environmental studies.
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Affiliation(s)
- Vlastimil Novak
- Plant Nutrients and Food Quality Research Group, Plant and Soil Science Section and Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - Purna Kumar Khatri
- Plant Nutrients and Food Quality Research Group, Plant and Soil Science Section and Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - Kristian Holst Laursen
- Plant Nutrients and Food Quality Research Group, Plant and Soil Science Section and Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
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30
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Development of metallosupramolecular phosphatases based on the combinatorial self-assembly of metal complexes and organic building blocks for the catalytic hydrolysis of phosphate monoesters. RESULTS IN CHEMISTRY 2021. [DOI: 10.1016/j.rechem.2021.100133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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31
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Lai R, Cui Q. Differences in the Nature of the Phosphoryl Transfer Transition State in Protein Phosphatase 1 and Alkaline Phosphatase: Insights from QM Cluster Models. J Phys Chem B 2020; 124:9371-9384. [PMID: 33030898 PMCID: PMC7647665 DOI: 10.1021/acs.jpcb.0c07863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Quantum mechanical (QM) cluster models are used to probe effects on the catalytic properties of protein phosphatase 1 (PP1) and alkaline phosphatase (AP) due to metal ions and active site residues. The calculations suggest that the phosphoryl transfer transition states in PP1 are synchronous in nature with a significant degree of P-Olg cleavage, while those in AP are tighter with a modest degree of P-Olg cleavage and a range of P-Onuc formation. Similar to observations made in our recent work, a significant degree of cross talk between the forming and breaking P-O bonds complicates the interpretation of the Brønsted relation, especially in regard to AP for which the computed βlg/βEQ,lg value does not correlate with the degree of P-Olg cleavage regardless of the metal ions in the active site. By comparison, the correlation between βlg/βEQ,lg and the P-Olg bond order is more applicable to PP1, which generally exhibits less variation in the transition state than AP. Results for computational models with swapped metal ions between PP1 and AP suggest that the metal ions modulate both the nature of the transition state and the degrees of sensitivity of the transition state to the leaving group. In the reactant state, the degree of the scissile bond polarization is also different in the two enzymes, although this difference appears to be largely determined by the active site residues rather than the metal ions. Therefore, both the identity of the metal ion and the positioning of polar or charged residues in the active site contribute to the distinct catalytic characteristics of these enzymes. Several discrepancies observed between the QM cluster results and the available experimental data highlight the need for further QM/MM method developments for the quantitative analysis of metalloenzymes that contain open-shell transition metal ions.
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Affiliation(s)
- Rui Lai
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Qiang Cui
- Departments of Chemistry, Physics, and Biomedical Engineering, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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32
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Hu QH, Williams MT, Shulgina I, Fossum CJ, Weeks KM, Adams LM, Reinhardt CR, Musier-Forsyth K, Hati S, Bhattacharyya S. Editing Domain Motions Preorganize the Synthetic Active Site of Prolyl-tRNA Synthetase. ACS Catal 2020; 10:10229-10242. [PMID: 34295570 DOI: 10.1021/acscatal.0c02381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Prolyl-tRNA synthetases (ProRSs) catalyze the covalent attachment of proline onto cognate tRNAs, an indispensable step for protein synthesis in all living organisms. ProRSs are modular enzymes and the "prokaryotic-like" ProRSs are distinguished from "eukaryotic-like" ProRSs by the presence of an editing domain (INS) inserted between motifs 2 and 3 of the main catalytic domain. Earlier studies suggested the presence of coupled-domain dynamics could contribute to catalysis; however, the role that the distal, highly mobile INS domain plays in catalysis at the synthetic active site is not completely understood. In the present study, a combination of theoretical and experimental approaches has been used to elucidate the precise role of INS domain dynamics. Quantum mechanical/molecular mechanical simulations were carried out to model catalytic Pro-AMP formation by Enterococcus faecalis ProRS. The energetics of the adenylate formation by the wild-type enzyme was computed and contrasted with variants containing active site mutations, as well as a deletion mutant lacking the INS domain. The combined results revealed that two distinct types of dynamics contribute to the enzyme's catalytic power. One set of motions is intrinsic to the INS domain and leads to conformational preorganization that is essential for catalysis. A second type of motion, stemming from the electrostatic reorganization of active site residues, impacts the height and width of the energy profile and has a critical role in fine tuning the substrate orientation to facilitate reactive collisions. Thus, motions in a distal domain can preorganize the active site of an enzyme to optimize catalysis.
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Affiliation(s)
- Quin H. Hu
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Murphi T. Williams
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Irina Shulgina
- Department of Chemistry and Biochemistry and Center for RNA Biology, The Ohio State University, Columbus, Ohio 43210, United States
| | - Carl J. Fossum
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Katelyn M. Weeks
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Lauren M. Adams
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Clorice R. Reinhardt
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Karin Musier-Forsyth
- Department of Chemistry and Biochemistry and Center for RNA Biology, The Ohio State University, Columbus, Ohio 43210, United States
| | - Sanchita Hati
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
| | - Sudeep Bhattacharyya
- Department of Chemistry and Biochemistry, University of Wisconsin, Eau Claire, Wisconsin 54701, United States
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33
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Shi J, Xu C, Xiang L, Chen J, Cai Z. Tris(2,4-di- tert-butylphenyl)phosphate: An Unexpected Abundant Toxic Pollutant Found in PM 2.5. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:10570-10576. [PMID: 32786564 DOI: 10.1021/acs.est.0c03709] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A novel pollutant, tris(2,4-di-tert-butylphenyl)phosphate (I168O), was identified in urban fine particulate matter (PM2.5) samples in a nontargeted screening based on mass spectrometry for the first time. I168O was detected in all samples collected from two typical cities far away from each other in China. The concentrations of I168O reached up to 851 (median: 153) ng/m3, indicating that it was a widespread and abundant pollutant in the air. The antioxidant Irgafos 168 [I168, tris(2,4-di-tert-butylphenyl)phosphite] popularly added in plastics was the most suspected source for the detected I168O. Simulation studies indicated that heating, UV radiation, and water contact might significantly (p < 0.05) transform I168 to I168O. In particular, I168O might be magnificently evaporated into the air at high temperatures. The outdoor inhalation exposure of I168O may exert substantial health risks.
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Affiliation(s)
- Jingchun Shi
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon, Hong Kong 999077, China
| | - Caihong Xu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP), Fudan Tyndall Centre, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China
| | - Li Xiang
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon, Hong Kong 999077, China
| | - Jianmin Chen
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP), Fudan Tyndall Centre, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China
- Institute of Eco-Chongming (IEC), East China Normal University, Shanghai 200062, China
| | - Zongwei Cai
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon, Hong Kong 999077, China
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34
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Pashirova TN, Fetin PA, Lezov AA, Kadnikov MV, Valeeva FG, Burilova EA, Bilibin AY, Zorin IM. Self-Assembled Quaternary Ammonium-Containing Comb-Like Polyelectrolytes for the Hydrolysis of Organophosphorous Esters: Effect of Head Groups and Counter-Ions. Chempluschem 2020; 85:1939-1948. [PMID: 32865345 DOI: 10.1002/cplu.202000417] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/27/2020] [Indexed: 12/17/2022]
Abstract
The aim of this work was to increase the efficiency of catalytic systems for the hydrolytic cleavage of 4-nitrophenyl esters of phosphonic acids. Quaternary ammonium-containing comb-like polyelectrolytes («polymerized micelles») with ester cleavable fragments and a low aggregation threshold were used as catalysts. The synthesis of poly(11-acryloyloxyundecylammonium) surfactants with different counterions (Br- , NO3 - , CH3 C6 H4 SO3 - ) and head groups was realized by micellar free-radical polymerization. Molecular weight, critical association concentration, particle sizes and solubilization properties toward Orange OT were determined. Self-assemblies organized by poly(11-acryloyloxyundecyltrimethyl ammonium) bromide successfully catalyze the hydrolysis of 4-nitrophenyl butylchloromethylphosphonate up to two orders of magnitude compared to aqueous alkaline hydrolysis. The development of these catalysts is promising for industrial applications and organophosphorus compound detoxification.
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Affiliation(s)
- Tatiana N Pashirova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St., 8, Kazan, 420088, Russian Federation
| | - Petr A Fetin
- Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab, St., Petersburg, 199034, Russian Federation
| | - Alexey A Lezov
- Department of Molecular Biophysics and Polymer Physics, Physical Faculty, St. Petersburg State University, 7/9 Universitetskaya nab, St., Petersburg, 199034, Russian Federation
| | - Matvey V Kadnikov
- Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab, St., Petersburg, 199034, Russian Federation
| | - Farida G Valeeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St., 8, Kazan, 420088, Russian Federation
| | - Evgenia A Burilova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov St., 8, Kazan, 420088, Russian Federation
| | - Alexander Yu Bilibin
- Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab, St., Petersburg, 199034, Russian Federation
| | - Ivan M Zorin
- Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab, St., Petersburg, 199034, Russian Federation
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35
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Jiang L, Sun Y, Chen Y, Nan P. From DNA to Nerve Agents – The Biomimetic Catalysts for the Hydrolysis of Phosphate Esters. ChemistrySelect 2020. [DOI: 10.1002/slct.202001947] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lei Jiang
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, College of Chemical Engineering China University of Petroleum (East China) Changjiang West Road, No.66. Qingdao 266580 China
| | - Yujiao Sun
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, College of Chemical Engineering China University of Petroleum (East China) Changjiang West Road, No.66. Qingdao 266580 China
| | - Yuxue Chen
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, College of Chemical Engineering China University of Petroleum (East China) Changjiang West Road, No.66. Qingdao 266580 China
| | - Pengli Nan
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, College of Chemical Engineering China University of Petroleum (East China) Changjiang West Road, No.66. Qingdao 266580 China
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Chowdhury T, Dasgupta S, Khatua S, Acharya K, Das D. Executing a Series of Zinc(II) Complexes of Homologous Schiff Base Ligands for a Comparative Analysis on Hydrolytic, Antioxidant, and Antibacterial Activities. ACS APPLIED BIO MATERIALS 2020; 3:4348-4357. [PMID: 35025433 DOI: 10.1021/acsabm.0c00372] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Six zinc(II) complexes, namely, [Zn(HL1H)Cl2] (1), [Zn(HL1H)Br2] (2), [Zn2(HL1H)2(OH)I2]·I (3), [Zn(HL2)Cl] (4), [Zn2(HL2)Br3] (5), and [Zn(HL2)I] (6) have been manufactured by using two homologous Schiff base ligands H2L1 and H2L2 for the purpose of perlustrating their phosphatase-like activity, antioxidant activity, and antibacterial activity. Complexes 1, 2, 4, and 5 have been reported earlier by us, whereas complexes 3 and 6 have been synthesized and structurally characterized by regular physicochemical methods The hydrolytic property of the six complexes has been evaluated by checking the hydrolysis of the P-O bond of a widely used substrate, namely, disodium salt of (para-nitrophenyl)phosphate (PNPP) in 97.5% (v/v) mixture of N,N-dimethylformamide and water (DMF-water). Complexes 2-5 have profound efficiency toward hydrolysis of phosphate ester bonds, and complexes 1 and 6 were noted to be inactive toward hydrolysis. Complex 3 displayed the highest efficacy among the six complexes. Additionally, antioxidant and antibacterial activities of the complexes were studied thoroughly. A detailed study of their antioxidant property revealed that complex 3 manifested superior radical scavenging activity, thus exhibiting the highest antioxidant property. The antibacterial activity was tested using four investigating bacteria, specifically Listeria monocytogenes ATCC19111, Staphylococcus aureus ATCC 700699, Salmonella typhimurium ATCC 23564, and Escherichia coli ATCC 25922 by determining minimum inhibitory concentration (MIC) values using the microdilution method. Here as well, complex 3 exhibited the highest activity to both Gram positive and Gram negative bacteria. The chemistry behind these experimental findings has been manifested by shedding light upon the structural features of the complexes. The suitable choice of ligand H2L1 where one methylene group is less than its homologous ligand and metal precursor (ZnI2) imparts a unique hydroxo-bridged molecular geometry and 2D hydrogen bonding network which in turn probably enhances the hydrolytic and biological activities of complex 3.
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Affiliation(s)
- Tania Chowdhury
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Sanchari Dasgupta
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Somanjana Khatua
- Molecular and Applied Mycology and Plant Pathology Laboratory, Centre of Advanced Study, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019 West Bengal, India
| | - Krishnendu Acharya
- Molecular and Applied Mycology and Plant Pathology Laboratory, Centre of Advanced Study, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019 West Bengal, India
| | - Debasis Das
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
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37
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Yam VWW, Law ASY. Luminescent d8 metal complexes of platinum(II) and gold(III): From photophysics to photofunctional materials and probes. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213298] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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38
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Abstract
Enzymes are predominantly proteins able to effectively and selectively catalyze highly complex biochemical reactions in mild reaction conditions. Nevertheless, they are limited to the arsenal of reactions that have emerged during natural evolution in compliance with their intrinsic nature, three-dimensional structures and dynamics. They optimally work in physiological conditions for a limited range of reactions, and thus exhibit a low tolerance for solvent and temperature conditions. The de novo design of synthetic highly stable enzymes able to catalyze a broad range of chemical reactions in variable conditions is a great challenge, which requires the development of programmable and finely tunable artificial tools. Interestingly, over the last two decades, chemists developed protein secondary structure mimics to achieve some desirable features of proteins, which are able to interfere with the biological processes. Such non-natural oligomers, so called foldamers, can adopt highly stable and predictable architectures and have extensively demonstrated their attractiveness for widespread applications in fields from biomedical to material science. Foldamer science was more recently considered to provide original solutions to the de novo design of artificial enzymes. This review covers recent developments related to peptidomimetic foldamers with catalytic properties and the principles that have guided their design.
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39
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Szeler K, Williams NH, Hengge AC, Kamerlin SCL. Modeling the Alkaline Hydrolysis of Diaryl Sulfate Diesters: A Mechanistic Study. J Org Chem 2020; 85:6489-6497. [PMID: 32309943 PMCID: PMC7304899 DOI: 10.1021/acs.joc.0c00441] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Indexed: 12/11/2022]
Abstract
Phosphate and sulfate esters have important roles in regulating cellular processes. However, while there has been substantial experimental and computational investigation of the mechanisms and the transition states involved in phosphate ester hydrolysis, there is far less work on sulfate ester hydrolysis. Here, we report a detailed computational study of the alkaline hydrolysis of diaryl sulfate diesters, using different DFT functionals as well as mixed implicit/explicit solvation with varying numbers of explicit water molecules. We consider the impact of the computational model on computed linear free-energy relationships (LFER) and the nature of the transition states (TS) involved. We obtain good qualitative agreement with experimental LFER data when using a pure implicit solvent model and excellent agreement with experimental kinetic isotope effects for all models used. Our calculations suggest that sulfate diester hydrolysis proceeds through loose transition states, with minimal bond formation to the nucleophile and bond cleavage to the leaving group already initiated. Comparison to prior work indicates that these TS are similar in nature to those for the alkaline hydrolysis of neutral arylsulfonate monoesters or charged phosphate diesters and fluorophosphates. Obtaining more detailed insights into the transition states involved assists in understanding the selectivity of enzymes that hydrolyze these reactions.
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Affiliation(s)
- Klaudia Szeler
- Department
of Chemistry − BMC, Uppsala University, BMC Box 576, S-751 23 Uppsala, Sweden
| | | | - Alvan C. Hengge
- Department
of Chemistry and Biochemistry, Utah State
University, Logan, Utah 84322-0300, United States
| | - Shina C. L. Kamerlin
- Department
of Chemistry − BMC, Uppsala University, BMC Box 576, S-751 23 Uppsala, Sweden
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40
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Chen H, Snurr RQ. Insights into Catalytic Gas-Phase Hydrolysis of Organophosphate Chemical Warfare Agents by MOF-Supported Bimetallic Metal-Oxo Clusters. ACS APPLIED MATERIALS & INTERFACES 2020; 12:14631-14640. [PMID: 31909586 DOI: 10.1021/acsami.9b19484] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Zirconium-based metal-organic frameworks (Zr-MOFs) have been reported to be efficient catalysts for the hydrolysis of organophosphate chemical warfare agents (CWAs) in buffered solutions. However, for the gas-phase reaction, which is more relevant to the situation in a battlefield gas mask application, the kinetics of Zr-MOF catalysts may be severely hindered by strong product inhibition. To improve the catalytic performance, we computationally screened a series of synthetically accessible Zr-MOF-supported bimetallic metal-oxo clusters in which the metal-oxygen-metal active motif is preserved, aiming to find catalysts that have lower binding affinities to the hydrolysis product. For the promising catalyst Al2O2(OH)2@NU-1000 identified from the screening using density functional theory, we mapped out the full reaction pathway of gas-phase dimethyl p-nitrophenolphosphate (DMNP) hydrolysis and analyzed the free energy profile as well as the turnover frequency (TOF). We found that the catalytic mechanism on the new catalyst is slightly different from the one on NU-1000, which also led to a different TOF-limiting step. Additional factors that can affect the overall catalytic performance in practical application, such as the amount of ambient moisture and the existence of acid gases that may poison the catalyst, have also been evaluated.
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Affiliation(s)
- Haoyuan Chen
- Department of Chemical & Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Randall Q Snurr
- Department of Chemical & Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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41
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Ma W, Dai W, Liu Q, Chen Y, Zhao Y, Cao S. Synthesis of novel spirophosphanes containing a pentacoordinated P–C bond by P-alkylation reaction. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130886] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Pettersson P, Barth A. Correlations between the structure and the vibrational spectrum of the phosphate group. Implications for the analysis of an important functional group in phosphoproteins. RSC Adv 2020; 10:4715-4724. [PMID: 35495230 PMCID: PMC9049017 DOI: 10.1039/c9ra10366j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 01/17/2020] [Indexed: 12/02/2022] Open
Abstract
Density functional theory calculations were used to establish correlations between the structure and the vibrational spectrum of the phosphate group in model compounds for phosphorylated amino acids. The model compounds were acetyl phosphate, methyl phosphate, and p-tolyl phosphate, which represented the phosphorylated amino acids aspartyl phosphate, serine or threonine phosphate, and tyrosine phosphate, respectively. The compounds were placed in different environments consisting of one or several HF or H2O molecules, which modeled interactions of phosphorylated amino acids in the protein environment. The calculations were performed with the B3LYP functional and the 6-311++G(3df, 3pd) basis set. In general, the wavenumbers (or frequencies) of the stretching vibrations of the terminal P–O bonds correlated better with bond lengths of the phosphate group than with its bond angles. The best correlations were obtained with the shortest and the mean terminal P–O bond lengths with standard deviations from the trend line of only 0.2 pm. Other useful correlations were observed with the bond length difference between the shortest and longest terminal P–O bond and with the bond length of the bridging P–O bond. Vibrational frequencies of phosphate are sensitive to bond length changes on the sub-picometer scale.![]()
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Affiliation(s)
- Pontus Pettersson
- Department of Biochemistry and Biophysics
- Arrhenius Laboratories
- Stockholm University
- 10691 Stockholm
- Sweden
| | - Andreas Barth
- Department of Biochemistry and Biophysics
- Arrhenius Laboratories
- Stockholm University
- 10691 Stockholm
- Sweden
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43
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Zhou X, Zhang XP, Li W, Jiang J, Xu H, Ke Z, Phillips DL, Zhao C. Unraveling mechanisms of the uncoordinated nucleophiles: theoretical elucidations of the cleavage of bis( p-nitrophenyl) phosphate mediated by zinc-complexes with apical nucleophiles. RSC Adv 2019; 9:37696-37704. [PMID: 35541823 PMCID: PMC9075727 DOI: 10.1039/c9ra06737j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/01/2019] [Indexed: 02/01/2023] Open
Abstract
A theoretical approach was used to investigate the hydrolytic cleavage mechanisms of the bis(p-nitrophenyl) phosphate (BNPP−) catalyzed by Zn(ii)-complexes featuring uncoordinated nucleophiles. Ligand-based and alternative solvent-based nucleophilic attack reaction models are proposed. The pKa values of the Zn(ii)-bound water molecules or ligands in the [Zn(LnH)(η-H2O)(H2O)]2+ (n = 1, 2 and 3) complexes, as well as the dimerization tendency of the mononuclear Zn(ii)-complexes, were found to significantly influence the reaction mechanisms. The Zn(ii)-L3 complexes were found to be more favorable for the hydrolytic cleavage of the BNPP−via a ligand-based nucleophilic attack pathway. This was due to the lower pKa value for the deprotonation of the oxime ligand, the hard dimerization of the mononuclear Zn(ii)-L3 species, and the presence of an uncoordinated nucleophile. The origins of the uncoordinated reactions were systematically elucidated. The theoretical results reported here are in good agreement with experimental observations and more importantly, help to elucidate the factors that influence intermolecular nucleophilic attack reactions with coordinated/uncoordinated nucleophiles. A theoretical approach was used to investigate the hydrolytic cleavage mechanisms of the bis(p-nitrophenyl) phosphate (BNPP−) catalyzed by Zn(ii)-complexes featuring uncoordinated nucleophiles.![]()
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Affiliation(s)
- Xiaoyu Zhou
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 P. R. China
| | - Xue-Peng Zhang
- School of Chemisty and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China
| | - Weikang Li
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 P. R. China
| | - Jingxing Jiang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, School of Materials Science and Engineering, Sun Yat-sen University Guangzhou 510275 P. R. China
| | - Huiying Xu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 P. R. China
| | - Zhuofeng Ke
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, School of Materials Science and Engineering, Sun Yat-sen University Guangzhou 510275 P. R. China
| | - David Lee Phillips
- Department of Chemistry, University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Cunyuan Zhao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 P. R. China
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Identification of a Specific Inhibitor of Human Scp1 Phosphatase Using the Phosphorylation Mimic Phage Display Method. Catalysts 2019. [DOI: 10.3390/catal9100842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Protein phosphatases are divided into tyrosine (Tyr) phosphatases and serine/threonine (Ser/Thr) phosphatases. While substrate trapping mutants are frequently used to identify substrates of Tyr phosphatases, a rapid and simple method to identify Ser/Thr phosphatase substrates is yet to be developed. The TFIIF-associating component of RNA polymerase II C-terminal domain (CTD) phosphatase/small CTD phosphatase (FCP/SCP) phosphatase family is one of the three types of Ser/Thr protein phosphatases. Defects in these phosphatases are correlated with the occurrence of various diseases such as cancer and neuropathy. Recently, we developed phosphorylation mimic phage display (PMPD) method with AlF4−, a methodology to identify substrates for FCP/SCP type Ser/Thr phosphatase Scp1. Here, we report a PMPD method using BeF3− to identify novel substrate peptides bound to Scp1. After screening peptide phages, we identified peptides that bound to Scp1 in a BeF3−-dependent manner. Synthetic phosphopeptide BeM12-1, the sequence of which was isolated at the highest frequency, directly bound to Scp1. The binding was inhibited by adding BeF3−, indicating that the peptide binds to the active center of catalytic site in Scp1. The phosphorylated BeM12-1 worked as a competitive inhibitor of Scp1. Thus, PMPD method may be applicable for the identification of novel substrates and inhibitors of the FCP/SCP phosphatase family.
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Unusual resistance of cobalt bis dicarbollide phosphate and phosphorothioate bridged esters towards alkaline hydrolysis: The “metallacarborane effect”. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Miyazawa Y, Rahman AB, Saga Y, Imafuku H, Hisamatsu Y, Aoki S. Catalytic Hydrolysis of Phosphate Monoester by Supramolecular Complexes Formed by the Self-Assembly of a Hydrophobic Bis(Zn 2+-cyclen) Complex, Copper, and Barbital Units That Are Functionalized with Amino Acids in a Two-Phase Solvent System. MICROMACHINES 2019; 10:mi10070452. [PMID: 31277494 PMCID: PMC6680849 DOI: 10.3390/mi10070452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 06/30/2019] [Accepted: 07/01/2019] [Indexed: 12/02/2022]
Abstract
We previously reported on the preparation of supramolecular complexes by the 2:2:2 assembly of a dinuclear Zn2+-cyclen (cyclen = 1,4,7,10-tetraazacyclododecane) complex having a 2,2′-bipyridyl linker equipped with 0~2 long alkyl chains (Zn2L1~Zn2L3), 5,5-diethylbarbituric acid (Bar) derivatives, and a copper(II) ion (Cu2+) in aqueous solution and two-phase solvent systems and their phosphatase activities for the hydrolysis of mono(4-nitrophenyl) phosphate (MNP). These supermolecules contain Cu2(μ-OH)2 core that mimics the active site of alkaline phosphatase (AP), and one of the ethyl groups of the barbital moiety is located in close proximity to the Cu2(μ-OH)2 core. The generally accepted knowledge that the amino acids around the metal center in the active site of AP play important roles in its hydrolytic activity inspired us to modify the side chain of Bar with various functional groups in an attempt to mimic the active site of AP in the artificial system, especially in two-phase solvent system. In this paper, we report on the design and synthesis of new supramolecular complexes that are prepared by the combined use of bis(Zn2+-cyclen) complexes (Zn2L1, Zn2L2, and Zn2L3), Cu2+, and Bar derivatives containing amino acid residues. We present successful formation of these artificial AP mimics with respect to the kinetics of the MNP hydrolysis obeying Michaelis–Menten scheme in aqueous solution and a two-phase solvent system and to the mode of the product inhibition by inorganic phosphate.
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Affiliation(s)
- Yuya Miyazawa
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Akib Bin Rahman
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yutaka Saga
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Hiroki Imafuku
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yosuke Hisamatsu
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Shin Aoki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
- Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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Fan F, Zheng Y, Zhang Y, Zheng H, Zhong J, Cao Z. A Comprehensive Understanding of Enzymatic Degradation of the G-Type Nerve Agent by Phosphotriesterase: Revised Role of Water Molecules and Rate-Limiting Product Release. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01877] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Fangfang Fan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 360015, People’s Republic of China
| | - Yongchao Zheng
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, People’s Republic of China
| | - Yuwei Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 360015, People’s Republic of China
| | - He Zheng
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, People’s Republic of China
| | - Jinyi Zhong
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, People’s Republic of China
| | - Zexing Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 360015, People’s Republic of China
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Calixto AR, Moreira C, Pabis A, Kötting C, Gerwert K, Rudack T, Kamerlin SCL. GTP Hydrolysis Without an Active Site Base: A Unifying Mechanism for Ras and Related GTPases. J Am Chem Soc 2019; 141:10684-10701. [PMID: 31199130 DOI: 10.1021/jacs.9b03193] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
GTP hydrolysis is a biologically crucial reaction, being involved in regulating almost all cellular processes. As a result, the enzymes that catalyze this reaction are among the most important drug targets. Despite their vital importance and decades of substantial research effort, the fundamental mechanism of enzyme-catalyzed GTP hydrolysis by GTPases remains highly controversial. Specifically, how do these regulatory proteins hydrolyze GTP without an obvious general base in the active site to activate the water molecule for nucleophilic attack? To answer this question, we perform empirical valence bond simulations of GTPase-catalyzed GTP hydrolysis, comparing solvent- and substrate-assisted pathways in three distinct GTPases, Ras, Rab, and the Gαi subunit of a heterotrimeric G-protein, both in the presence and in the absence of the corresponding GTPase activating proteins. Our results demonstrate that a general base is not needed in the active site, as the preferred mechanism for GTP hydrolysis is a conserved solvent-assisted pathway. This pathway involves the rate-limiting nucleophilic attack of a water molecule, leading to a short-lived intermediate that tautomerizes to form H2PO4- and GDP as the final products. Our fundamental biochemical insight into the enzymatic regulation of GTP hydrolysis not only resolves a decades-old mechanistic controversy but also has high relevance for drug discovery efforts. That is, revisiting the role of oncogenic mutants with respect to our mechanistic findings would pave the way for a new starting point to discover drugs for (so far) "undruggable" GTPases like Ras.
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Affiliation(s)
- Ana R Calixto
- Department of Chemistry-BMC , Uppsala University , Box 576, S-751 23 Uppsala , Sweden
| | - Cátia Moreira
- Department of Chemistry-BMC , Uppsala University , Box 576, S-751 23 Uppsala , Sweden
| | - Anna Pabis
- Department of Cell and Molecular Biology , Uppsala University , BMC Box 596, S-751 24 , Uppsala , Sweden
| | - Carsten Kötting
- Department of Biophysics , Ruhr University Bochum , 44801 Bochum , Germany
| | - Klaus Gerwert
- Department of Biophysics , Ruhr University Bochum , 44801 Bochum , Germany
| | - Till Rudack
- Department of Biophysics , Ruhr University Bochum , 44801 Bochum , Germany
| | - Shina C L Kamerlin
- Department of Chemistry-BMC , Uppsala University , Box 576, S-751 23 Uppsala , Sweden
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Buschiazzo A, Trajtenberg F. Two-Component Sensing and Regulation: How Do Histidine Kinases Talk with Response Regulators at the Molecular Level? Annu Rev Microbiol 2019; 73:507-528. [PMID: 31226026 DOI: 10.1146/annurev-micro-091018-054627] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Perceiving environmental and internal information and reacting in adaptive ways are essential attributes of living organisms. Two-component systems are relevant protein machineries from prokaryotes and lower eukaryotes that enable cells to sense and process signals. Implicating sensory histidine kinases and response regulator proteins, both components take advantage of protein phosphorylation and flexibility to switch conformations in a signal-dependent way. Dozens of two-component systems act simultaneously in any given cell, challenging our understanding about the means that ensure proper connectivity. This review dives into the molecular level, attempting to summarize an emerging picture of how histidine kinases and cognate response regulators achieve required efficiency, specificity, and directionality of signaling pathways, properties that rely on protein:protein interactions. α helices that carry information through long distances, the fine combination of loose and specific kinase/regulator interactions, and malleable reaction centers built when the two components meet emerge as relevant universal principles.
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Affiliation(s)
- Alejandro Buschiazzo
- Laboratory of Molecular and Structural Microbiology, Institut Pasteur de Montevideo, Montevideo 11400, Uruguay; , .,Integrative Microbiology of Zoonotic Agents, Department of Microbiology, Institut Pasteur, Paris 75015, France
| | - Felipe Trajtenberg
- Laboratory of Molecular and Structural Microbiology, Institut Pasteur de Montevideo, Montevideo 11400, Uruguay; ,
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Rahman AB, Imafuku H, Miyazawa Y, Kafle A, Sakai H, Saga Y, Aoki S. Catalytic Hydrolysis of Phosphate Monoester by Supramolecular Phosphatases Formed from a Monoalkylated Dizinc(II) Complex, Cyclic Diimide Units, and Copper(II) in Two-Phase Solvent System. Inorg Chem 2019; 58:5603-5616. [PMID: 30969761 DOI: 10.1021/acs.inorgchem.8b03586] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Design and synthesis of enzyme mimic with programmed molecular interaction among several building blocks including metal complexes and metal chelators is of intellectual and practical significance. The preparation of artificial enzymes that mimic the natural enzymes such as hydrolases, phosphatases, etc. remains a great challenge in the field of supramolecular chemistry. Herein we report on the design and synthesis of asymmetric (nonsymmetric) supermolecules by the 2:2:2 self-assembly of an amphiphilic zinc(II)-cyclen complex containing a 2,2'-bipyridyl linker and one long alkyl chain (Zn2L3), barbital analogues, and Cu2+ as model compounds of an enzyme alkaline phosphatase that catalyzes the hydrolysis of phosphate monoesters such as mono(4-nitrophenyl)phosphate at neutral pH in two-phase solvent system (H2O/CHCl3) in pH 7.4 and 37 °C. Hydrolytic activity of these complexes was found to be catalytic, and their catalytic turnover numbers are 3-4. The mechanistic studies based on the UV/vis and emission spectra of the H2O and CHCl3 phases of the reaction mixtures suggest that the hydrophilicity/hydrophobicity balance of the supramolecular catalysts is an important factor for catalytic activity.
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