1
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Schneider JS, Helten H. Hybrid materials comprising ferrocene and diaminoborane moieties: linear concatenation versus macrocyclization. Chem Commun (Camb) 2024. [PMID: 39228359 DOI: 10.1039/d4cc03813d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024]
Abstract
Combination of borane and diaminoferrocene monomers by Si/B exchange condensation reactions afforded either diazabora-[3]ferrocenophanes or, via stepwise processes, larger macrocycles and a series of linear oligomers. Additional incorporation of p-phenylene moieties in the backbone yielded alternating concatenation.
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Affiliation(s)
- Johannes S Schneider
- Julius-Maximilians-Universität Würzburg, Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Am Hubland, 97074 Würzburg, Germany.
| | - Holger Helten
- Julius-Maximilians-Universität Würzburg, Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Am Hubland, 97074 Würzburg, Germany.
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2
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Zhang C, Jiang X, Jing Y, Zhang N, Wang P, Wang H, Jiang K, Chen XM, Chen X. Synthesis, Structures, and Reactivities of BCN-Heterocyclic B-N Chains. Inorg Chem 2024; 63:10519-10526. [PMID: 38804144 DOI: 10.1021/acs.inorgchem.4c00772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The BCN-heterocyclic B-N chain compounds, the sodium and potassium salts of 3 and 4 anions (Na3, Na4, and K4), were synthesized by reactions of ethane 1,2-diamineborane (BH3NH2CH2CH2NH2BH3, 1) and propane 1,2-diamineborane (BH3NH2CH2CH2CH2NH2BH3, 2) with MH (M = Na and K). Then, the neutral B-N chain compounds 5 and 6 were prepared with dehydrogenation of [NH4]3 and [NH4]4, formed by metathesis reactions of Na3 and Na4 with NH4Cl or NH4SCN, respectively. Compounds 7 and 8, analog 5, were also prepared using pyridine and 4-methoxypyridine instead of NH3 in 5. These synthesized compounds were characterized spectroscopically, and the singe-crystal structures of the Na3·18-crown-6 and K4·18-crown-6 adducts were determined. Furthermore, the reactions of Na3 and Na4 with cationic B-N chain compounds, [NH3BH2NH3]Cl and [NH3BH2NH2BH2NH3]Cl, could not form longer BCN-heterocyclic B-N chain. The solubility of metal hydrides, the ability for proton abstracting, the basicity of Lewis bases, and the chelate effect may influence these reactions even though the reaction mechanism is not fully understood.
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Affiliation(s)
- Chen Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xin Jiang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yi Jing
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Na Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Peng Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Hongju Wang
- School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Kai Jiang
- School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xi-Meng Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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3
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Choi S, Dong G. Rapid and Modular Access to Multifunctionalized 1,2-Azaborines via Palladium/Norbornene Cooperative Catalysis. J Am Chem Soc 2024; 146:9512-9518. [PMID: 38551167 DOI: 10.1021/jacs.4c01582] [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: 04/11/2024]
Abstract
1,2-Azaborines, a unique class of BN-isosteres of benzene, have attracted great interest across several fields. While significant advancements have been made in the postfunctionalization of 1,2-azaborines, challenges still exist for the selective functionalization of the C4 position and access to 1,2-azaborines with five or six independently installed substituents. Here we report a rapid and modular method for C3 and C4 difunctionalization of 1,2-azaborines using the palladium/norbornene (Pd/NBE) cooperative catalysis. Enabled by the C2 amide-substituted NBE, diverse 3-iodo-1,2-azaborines can be used as substrates, showing broad functional group tolerance. Besides ortho arylation, preliminary success of ortho alkylation has also been realized. In addition, a range of alkenes and nucleophiles can be employed for ipso C3 functionalization. The reaction is scalable, and various postfunctionalizations, including forming hexa-substituted 1,2-azaborines, have been achieved.
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Affiliation(s)
- Shinyoung Choi
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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4
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Müller M, Neitz H, Höbartner C, Helten H. BN-Phenanthrene- and BN-Pyrene-Based Fluorescent Uridine Analogues. Org Lett 2024; 26:1051-1055. [PMID: 38285916 DOI: 10.1021/acs.orglett.3c04226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
Two unprecedented fluorescent nucleosides that feature BN-doped polycyclic aromatic hydrocarbons are presented. One of them, having a BN-modified phenanthrene moiety incorporated, shows blue fluorescence but suffers from poor stability under aqueous conditions. The other nucleoside comprises an internally BN-doped pyrene as the chromophore. It shows green fluorescence in various solvents and is stable under aqueous and alkaline conditions.
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Affiliation(s)
- Michael Müller
- Julius-Maximilians-Universität Würzburg, Institute of Inorganic Chemistry, Am Hubland, 97074 Würzburg, Germany
- Julius-Maximilians-Universität Würzburg, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Am Hubland, 97074 Würzburg, Germany
| | - Hermann Neitz
- Julius-Maximilians-Universität Würzburg, Institute of Organic Chemistry, Am Hubland, 97074 Würzburg, Germany
| | - Claudia Höbartner
- Julius-Maximilians-Universität Würzburg, Institute of Organic Chemistry, Am Hubland, 97074 Würzburg, Germany
- Julius-Maximilians-Universität Würzburg, Center for Nanosystems Chemistry (CNC), Theodor-Boveri-Weg, 97074 Würzburg, Germany
| | - Holger Helten
- Julius-Maximilians-Universität Würzburg, Institute of Inorganic Chemistry, Am Hubland, 97074 Würzburg, Germany
- Julius-Maximilians-Universität Würzburg, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Am Hubland, 97074 Würzburg, Germany
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5
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Harada M, Fujioka S, Ansai S, Wang C, Kamino S, Hirano K, Uchiyama M. BN-Embedded Aromatic Hydrocarbon Synthesis via Nucleophilic Diboration Reactions. Org Lett 2024; 26:247-251. [PMID: 38112185 DOI: 10.1021/acs.orglett.3c03898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Activation of bis(pinacolato)diboron with aromatic lithium amide promotes diboration of the proximal C-C triple bond, leading to BN-embedded aromatic compounds. In situ treatment of the initially generated spirocyclic borate intermediate with aqueous acid or organometallic reagents enables ligand installation on the endocyclic boron atom.
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Affiliation(s)
- Mei Harada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Shota Fujioka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shoma Ansai
- Faculty of Pharmaceutical Sciences, Institute of Medicinal, Pharmaceutical, and Health Sciences, Kanazawa University, Ka-kuma-machi, Kanazawa 920-1192, Japan
| | - Chao Wang
- Faculty of Pharmaceutical Sciences, Institute of Medicinal, Pharmaceutical, and Health Sciences, Kanazawa University, Ka-kuma-machi, Kanazawa 920-1192, Japan
| | - Shinichiro Kamino
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Keiichi Hirano
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano 920-1192, Japan
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6
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Gliese PJ, Appiarius Y, Scheele T, Lork E, Neudecker T, Staubitz A. Synthesis and crystal structure of 2-(anthracen-9-yl)-1-( tert-butyl-dimethyl-sil-yl)-3,6-di-hydro-1λ 4,2λ 4-aza-borinine. Acta Crystallogr E Crystallogr Commun 2023; 79:1012-1016. [PMID: 37936862 PMCID: PMC10626957 DOI: 10.1107/s2056989023008381] [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: 08/18/2023] [Accepted: 09/23/2023] [Indexed: 11/09/2023]
Abstract
The title compound, C24H30BNSi (I), is an asymmetric 1,2,3,6-tetra-hydro-1,2-aza-borinine consisting of a BN-substituted cyclo-hexa-diene analog with a B-anthracenyl substituent. A ring-closing metathesis with subsequent substitution of the obtained BCl 1,2-aza-borinine using anthracenyl lithium yielded the title compound I. The asymmetric unit (Z = 8) belongs to the ortho-rhom-bic space group Pbca and shows an elongated N-C bond compared to previously reported BN-1,4-cyclo-hexa-diene [Abbey et al. (2008 ▸) J. Am. Chem. Soc. 130, 7250-7252]. The primarily contributing surface inter-actions are H⋯H and C⋯H/H⋯C (as elucidated by Hirshfeld surface analysis) which are dominated by van der Waals forces. Moreover, the non-aromatic BN heterocycle and the protecting group exhibit intra- and inter-molecular C-H⋯π inter-actions, respectively, with the anthracenyl substituent.
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Affiliation(s)
- Philipp J. Gliese
- University of Bremen, Institute for Organic and Analytical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
| | - Yannik Appiarius
- University of Bremen, Institute for Organic and Analytical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
| | - Tarek Scheele
- University of Bremen, Institute for Physical and Theoretical Chemistry, 28359 Bremen, Germany
| | - Enno Lork
- University of Bremen, Institute for Inorganic Chemistry and Crystallography, 28359 Bremen, Germany
| | - Tim Neudecker
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
- University of Bremen, Institute for Physical and Theoretical Chemistry, 28359 Bremen, Germany
- Bremen Center for Computational Materials Science, 28359 Bremen, Germany
| | - Anne Staubitz
- University of Bremen, Institute for Organic and Analytical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
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7
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Liao S, Liu K, Wu H, Kuang Q, Hu X, Li Y, Lu H, Yuan J. A rapid construction of 1,3,2-benzodiazaborininones [R-B(aam)] from boronic acids and anthranilamides. RSC Adv 2023; 13:2570-2573. [PMID: 36741161 PMCID: PMC9847347 DOI: 10.1039/d2ra06573h] [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: 10/18/2022] [Accepted: 12/20/2022] [Indexed: 01/19/2023] Open
Abstract
A simple, efficient and mild methodology for the synthesis of 1,3,2-benzodiazaborininones [R-B(aam)] from boronic acids and anthranilamides on ethyl acetate is described. A series of 1,3,2-benzodiazaborininones were prepared in moderate to excellent yields at room temperature without dehydrating agents, metal catalysts, corrosive acids or other additives. Meanwhile, a multi-gram scale reaction is also performed to ensure the scalability of the reaction, and the product can be conveniently isolated by simple filtration.
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Affiliation(s)
- Siwei Liao
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Kai Liu
- Department of Pharmacy, Chongqing Public Health Medical CenterPR China
| | - Huili Wu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Qiulin Kuang
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Xueyuan Hu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Yihao Li
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Hongxiao Lu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
| | - Jianyong Yuan
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical UniversityChongqing 400016PR China
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8
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Pastore AJ, Montoya A, Kamat M, Basso KB, Italia JS, Chatterjee A, Drosou M, Pantazis DA, Angerhofer A. Selective incorporation of 5-hydroxytryptophan blocks long range electron transfer in oxalate decarboxylase. Protein Sci 2023; 32:e4537. [PMID: 36482787 PMCID: PMC9801070 DOI: 10.1002/pro.4537] [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: 09/23/2022] [Revised: 11/28/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022]
Abstract
Oxalate decarboxylase from Bacillus subtilis is a binuclear Mn-dependent acid stress response enzyme that converts the mono-anion of oxalic acid into formate and carbon dioxide in a redox neutral unimolecular disproportionation reaction. A π-stacked tryptophan dimer, W96 and W274, at the interface between two monomer subunits facilitates long-range electron transfer between the two Mn ions and plays an important role in the catalytic mechanism. Substitution of W96 with the unnatural amino acid 5-hydroxytryptophan leads to a persistent EPR signal which can be traced back to the neutral radical of 5-hydroxytryptophan with its hydroxyl proton removed. 5-Hydroxytryptophan acts as a hole sink preventing the formation of Mn(III) at the N-terminal active site and strongly suppresses enzymatic activity. The lower boundary of the standard reduction potential for the active site Mn(II)/Mn(III) couple can therefore be estimated as 740 mV against the normal hydrogen electrode at pH 4, the pH of maximum catalytic efficiency. Our results support the catalytic importance of long-range electron transfer in oxalate decarboxylase while at the same time highlighting the utility of unnatural amino acid incorporation and specifically the use of 5-hydroxytryptophan as an energetic sink for hole hopping to probe electron transfer in redox proteins.
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Affiliation(s)
| | - Alvaro Montoya
- Department of ChemistryUniversity of FloridaGainesvilleFloridaUSA
| | - Manasi Kamat
- Department of ChemistryUniversity of FloridaGainesvilleFloridaUSA
| | - Kari B. Basso
- Department of ChemistryUniversity of FloridaGainesvilleFloridaUSA
| | - James S. Italia
- Department of ChemistryBoston CollegeChestnut HillMassachusettsUSA
| | | | - Maria Drosou
- Max‐Planck‐Institut für KohlenforschungMülheim an der RuhrGermany
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9
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Sans-Panadés E, Vaquero JJ, Fernández-Rodríguez MA, García-García P. Synthesis of BN-Polyarenes by a Mild Borylative Cyclization Cascade. Org Lett 2022; 24:5860-5865. [PMID: 35913827 PMCID: PMC9384698 DOI: 10.1021/acs.orglett.2c02477] [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] [Indexed: 11/28/2022]
Abstract
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Reaction of BCl3 with suitably substituted o-alkynylanilines promotes a cascade reaction in which BN-polycyclic
compounds are obtained via the formation of two new cycles and three
new bonds in a single operational step. The reaction is highly efficient
and takes place at room temperature, providing a very mild and straightforward
strategy for the preparation of BN-aromatic compounds, which can be
further transformed into a variety of BN-PAHs with different polycyclic
cores and substituents.
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Affiliation(s)
- Ester Sans-Panadés
- Universidad de Alcalá (IRYCIS). Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR). Campus Científico-Tecnológico, Facultad de Farmacia. Autovía A-II, Km 33.1, 28805-Alcalá de Henares, Madrid, Spain
| | - Juan J Vaquero
- Universidad de Alcalá (IRYCIS). Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR). Campus Científico-Tecnológico, Facultad de Farmacia. Autovía A-II, Km 33.1, 28805-Alcalá de Henares, Madrid, Spain
| | - Manuel A Fernández-Rodríguez
- Universidad de Alcalá (IRYCIS). Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR). Campus Científico-Tecnológico, Facultad de Farmacia. Autovía A-II, Km 33.1, 28805-Alcalá de Henares, Madrid, Spain
| | - Patricia García-García
- Universidad de Alcalá (IRYCIS). Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR). Campus Científico-Tecnológico, Facultad de Farmacia. Autovía A-II, Km 33.1, 28805-Alcalá de Henares, Madrid, Spain
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10
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Das BC, Adil Shareef M, Das S, Nandwana NK, Das Y, Saito M, Weiss LM. Boron-Containing heterocycles as promising pharmacological agents. Bioorg Med Chem 2022; 63:116748. [PMID: 35453036 DOI: 10.1016/j.bmc.2022.116748] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/16/2022] [Accepted: 04/08/2022] [Indexed: 11/28/2022]
Abstract
The incorporation of the "magic" boron atom has been established as an important new strategy in the field of medicinal chemistry as boron compounds have been shown to form various bonds with their biological targets. Currently, a number of boron-based drugs (e.g. bortezomib, crisaborole, and tavaborole) have been FDA approved and are in the clinic, and several other boron-containing compounds are in clinical trials. Boron-based heterocycles have an incredible potential in the ongoing quest for new therapeutic agents owing to their plethora of biological activities and useful pharmacokinetic profiles. The present perspective is intended to review the pharmacological applications of boron-based heterocycles that have been published. We have classified these compounds into groups exhibiting shared pharmacological activities and discussed their corresponding biological targets focusing mainly on the most potent therapeutic compounds.
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Affiliation(s)
- Bhaskar C Das
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY, USA; Department of Medicine and Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Mohammed Adil Shareef
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY, USA
| | - Sasmita Das
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY, USA
| | - Nitesh K Nandwana
- Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, NY, USA
| | - Yogarupa Das
- Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA
| | - Mariko Saito
- Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA
| | - Louis M Weiss
- Department of Medicine, Division of Infectious Diseases and Department of Pathology Division of Parasitology and Tropical Medicine, Albert Einstein College of Medicine, Bronx NY-10461, USA
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11
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Micikas RJ, Acharyya A, Smith AB, Gai F. Synthesis and characterization of the fluorescence utility of two Visible-Light-Absorbing tryptophan derivatives. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Dai Y, Zhang X, Liu Y, Yu H, Su W, Zhou J, Ye Q, Huang Z. 1,6;2,3-Bis-BN Cyclohexane: Synthesis, Structure, and Hydrogen Release. J Am Chem Soc 2022; 144:8434-8438. [PMID: 35446021 DOI: 10.1021/jacs.1c13581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BN/CC isosterism has been widely investigated as a strategy to expand carbon-based compounds. The introduction of BN units in organic molecules always results in novel properties. In this work, we reported the first synthesis and characterization of 1,6;2,3-bis-BN cyclohexane, an isostere of cyclohexane with two adjacent BN pairs. Its ring flipping barrier is similar to that of cyclohexane. Protic hydrogens on N in 1,6;2,3-bis-BN cyclohexane show higher reactivity than its isomeric bis-BN cyclohexane. This compound exhibits an appealing hydrogen storage capability of >9.0 wt %, nearly twice as much as the 1,2;4,5-bis-BN cyclohexane.
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Affiliation(s)
- Yan Dai
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia
| | - Xin Zhang
- State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yongfeng Liu
- State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Haibo Yu
- Molecular Horizons and School of Chemistry & Molecular Bioscience, University of Wollongong, Northfields Avenue, Wollongong, New South Wales 2522, Australia
| | - Wei Su
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, China
| | - John Zhou
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia
| | - Qing Ye
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, China.,Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Zhenguo Huang
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia
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13
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Morita T, Murakami H, Asawa Y, Nakamura H. Enantioselective Synthesis of Oxazaborolidines by Palladium‐Catalyzed N−H/B−H Double Activation of 1,2‐Azaborines. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202113558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Taiki Morita
- Laboratory for Chemistry and Life Science Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
- School of Life Science and Technology Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
| | - Hiroki Murakami
- School of Life Science and Technology Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
| | - Yasunobu Asawa
- School of Life Science and Technology Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
- School of Life Science and Technology Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan
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14
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Morita T, Murakami H, Asawa Y, Nakamura H. Enantioselective Synthesis of Oxazaborolidines by Palladium-Catalyzed N-H/B-H Double Activation of 1,2-Azaborines. Angew Chem Int Ed Engl 2021; 61:e202113558. [PMID: 34913232 DOI: 10.1002/anie.202113558] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Indexed: 01/14/2023]
Abstract
A palladium-catalyzed N-H/B-H double activation of 1,2-dihydro-1,2-benzazaborines proceeded via cycloaddition with vinyl ethylene carbonate to produce polycyclic oxazaborolidines in 31-96 % yield. The key step in this process is the release of molecular hydrogen from a borate intermediate. Using a SPINOL-derived phosphoramidite as a chiral ligand, chiral oxazaborolidines were synthesized in good to high yields with excellent enantioselectivity (up to 95 % ee). The vinyl group of the resulting oxazaborolidine underwent metathesis, Heck reaction, and Wacker oxidation without affecting the oxazaborolidine framework.
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Affiliation(s)
- Taiki Morita
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan
| | - Hiroki Murakami
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan
| | - Yasunobu Asawa
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama, 226-8503, Japan
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15
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Adhikari A, Bhattarai BR, Aryal A, Thapa N, Kc P, Adhikari A, Maharjan S, Chanda PB, Regmi BP, Parajuli N. Reprogramming natural proteins using unnatural amino acids. RSC Adv 2021; 11:38126-38145. [PMID: 35498070 PMCID: PMC9044140 DOI: 10.1039/d1ra07028b] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 11/18/2021] [Indexed: 12/26/2022] Open
Abstract
Unnatural amino acids have gained significant attention in protein engineering and drug discovery as they allow the evolution of proteins with enhanced stability and activity. The incorporation of unnatural amino acids into proteins offers a rational approach to engineer enzymes for designing efficient biocatalysts that exhibit versatile physicochemical properties and biological functions. This review highlights the biological and synthetic routes of unnatural amino acids to yield a modified protein with altered functionality and their incorporation methods. Unnatural amino acids offer a wide array of applications such as antibody-drug conjugates, probes for change in protein conformation and structure-activity relationships, peptide-based imaging, antimicrobial activities, etc. Besides their emerging applications in fundamental and applied science, systemic research is necessary to explore unnatural amino acids with novel side chains that can address the limitations of natural amino acids.
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Affiliation(s)
- Anup Adhikari
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Bibek Raj Bhattarai
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Ashika Aryal
- Department of Chemistry, Birendra Multiple Campus, Tribhuvan University Bharatpur Chitwan Nepal
| | - Niru Thapa
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Puja Kc
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Ashma Adhikari
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Sushila Maharjan
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
| | - Prem B Chanda
- Department of Chemistry and Physics, Southeastern Louisiana University Hammond Louisiana 70402 USA
| | - Bishnu P Regmi
- Department of Chemistry, Florida Agricultural and Mechanical University Tallahassee Florida 32307 USA
| | - Niranjan Parajuli
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University Kritipur 44618 Kathmandu Nepal
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16
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Li J, Daniliuc CG, Matern J, Fernández G, Kehr G, Erker G. Multi-component synthesis of dihydro-1,3-azaborinine derived oxindole isosteres. Chem Commun (Camb) 2021; 57:7689-7692. [PMID: 34259251 DOI: 10.1039/d1cc02557k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the synthesis of the first examples of 1,3-azaborinine derived oxindole systems, the BN-isosteres of the important compound class of the oxindoles. Hydroboration of terminal aryl acetylenes with FmesBH2, followed by treatment with 2 equiv. of a glycine ester derived isonitrile gave a small series of 1,3-azaborinine derived oxindoles. The new BN-oxindoles show interesting photophysical behavior.
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Affiliation(s)
- Jun Li
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Jonas Matern
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gustavo Fernández
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gerald Kehr
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gerhard Erker
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
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17
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Heß M, Krummenacher I, Dellermann T, Braunschweig H. Rhodium-Mediated Stoichiometric Synthesis of Mono-, Bi-, and Bis-1,2-Azaborinines: 1-Rhoda-3,2-azaboroles as Reactive Precursors. Chemistry 2021; 27:9503-9507. [PMID: 34060149 PMCID: PMC8362125 DOI: 10.1002/chem.202100795] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Indexed: 11/22/2022]
Abstract
A series of highly substituted 1,2-azaborinines, including a phenylene-bridged bis-1,2-azaborinine, was synthesized from the reaction of 1,2-azaborete rhodium complexes with variously substituted alkynes. 1-Rhoda-3,2-azaborole complexes, which are accessible by phosphine addition to the corresponding 1,2-azaborete complexes, were also found to be suitable precursors for the synthesis of 1,2-azaborinines and readily reacted with alkynyl-substituted 1,2-azaborinines to generate new regioisomers of bi-1,2-azaborinines, which feature directly connected aromatic rings. Their molecular structures, which can be viewed as boron-nitrogen isosteres of biphenyls, show nearly perpendicular 1,2-azaborinine rings. The new method using rhodacycles instead of 1,2-azaborete complexes as precursors is shown to be more effective, allowing the synthesis of a wider range of 1,2-azaborinines.
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Affiliation(s)
- Merlin Heß
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Ivo Krummenacher
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Theresa Dellermann
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
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18
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Evaluating mutual influences of cation-π interactions and H-bonding: Cases of indole and BN-indole. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115131] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Ohler A, Long H, Ohgo K, Tyson K, Murray D, Davis A, Whittington C, Hvastkovs EG, Duffy L, Haddy A, Sargent AL, Allen WE, Offenbacher AR. Synthesis of redox-active fluorinated 5-hydroxytryptophans as molecular reporters for biological electron transfer. Chem Commun (Camb) 2021; 57:3107-3110. [PMID: 33626126 DOI: 10.1039/d1cc00187f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorinated 5-hydroxytryptophans (Fn-5HOWs) were synthesized in gram scale quantities and incorporated into a β-hairpin peptide and the protein azurin. The redox-active Fn-5HOWs exhibit unique radical spectroscopic signatures that expand the function of as probes for biological electron transfer.
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Affiliation(s)
- Amanda Ohler
- Department of Chemistry, East Carolina University, Greenville, NC, USA.
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20
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Boknevitz K, Darrigan C, Chrostowska A, Liu SY. Cation-π binding ability of BN indole. Chem Commun (Camb) 2020; 56:3749-3752. [PMID: 32125334 DOI: 10.1039/d0cc00869a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A BN indole-containing aromatic scaffold has been synthesized and the cation-π binding ability characterized by nuclear magnetic resonance (NMR) monitored titrations. The resulting chemical shifts were analyzed using a non-linear curve fitting procedure and the extracted association constants (Ka's) compared with the natural indole scaffold. Computations were also performed to support our findings. This work shows that incorporation of a B-N bond in place of a C-C bond in an aromatic system slightly lowers the cation-π binding ability of the arene's π-system with simple cations.
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Affiliation(s)
- Katherine Boknevitz
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.
| | - Clovis Darrigan
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
| | - Anna Chrostowska
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA. and Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Pau, France
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21
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Zhang Y, Li B, Liu S. Pd‐Senphos Catalyzed
trans
‐Selective Cyanoboration of 1,3‐Enynes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005882] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yuanzhe Zhang
- Department of Chemistry Boston College Chestnut Hill MA 02467-3860 USA
| | - Bo Li
- Department of Chemistry Boston College Chestnut Hill MA 02467-3860 USA
| | - Shih‐Yuan Liu
- Department of Chemistry Boston College Chestnut Hill MA 02467-3860 USA
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22
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Zhang Y, Li B, Liu SY. Pd-Senphos Catalyzed trans-Selective Cyanoboration of 1,3-Enynes. Angew Chem Int Ed Engl 2020; 59:15928-15932. [PMID: 32511855 PMCID: PMC7491284 DOI: 10.1002/anie.202005882] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Indexed: 12/25/2022]
Abstract
The first trans-selective cyanoboration reaction of an alkyne, specifically a 1,3-enyne, is described. The reported palladium-catalyzed cyanoboration of 1,3-enynes is site-, regio-, and diastereoselective, and is uniquely enabled by the 1,4-azaborine-based Senphos ligand structure. Tetra-substituted alkenyl nitriles are obtained providing useful boron-dienenitrile building blocks that can be further functionalized. The utility of our method has been demonstrated with the synthesis of Satigrel, an anti-platelet aggregating agent.
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Affiliation(s)
- Yuanzhe Zhang
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
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23
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Jiang HK, Wang YH, Weng JH, Kurkute P, Li CL, Lee MN, Chen PJ, Tseng HW, Tsai MD, Wang YS. Probing the Active Site of Deubiquitinase USP30 with Noncanonical Tryptophan Analogues. Biochemistry 2020; 59:2205-2209. [PMID: 32484330 DOI: 10.1021/acs.biochem.0c00307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Methanosarcina mazei pyrrolysyl-tRNA synthetase (PylRS) and its cognate tRNA have been evolved to generate genetically encoded noncanonical amino acids (ncAAs). Use of tryptophan (Trp) analogues with pyrrole ring modification for their spatial and polarity tuning in enzyme activity and substrate specificity is still limited. Herein, we report the application of an evolved PylRS, FOWRS2, for efficient incorporation of five Trp analogues into the deubiquitinase USP30 to decipher the role of W475 for diubiquitin selectivity. Structures of the five FOWRS-C/Trp analogue complexes at 1.7-2.5 Å resolution showed multiple ncAA binding modes. The W475 near the USP30 active site was replaced with Trp analogues, and the effect on the activity as well as the selectivity toward diubiquitin linkage types was examined. It was found that the Trp analogue with a formyl group attached to the nitrogen atom of the indole ring led to an improved activity of USP30 likely due to enhanced polar interactions and that another Trp analogue, 3-benzothienyl-l-alanine, induced a unique K6-specificity. Collectively, genetically encoded noncanonical Trp analogues by evolved PylRS·tRNACUAPyl pair unravel the spatial role of USP30-W475 in its diubiquitin selectivity.
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Affiliation(s)
- Han-Kai Jiang
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Chemical Biology and Molecular Biophysics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan.,Department of Chemistry, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Yi-Hui Wang
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Jui-Hung Weng
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Prashant Kurkute
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Chemical Biology and Molecular Biophysics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan.,Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Chien-Lung Li
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Man-Nee Lee
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Pei-Jung Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Hsueh-Wei Tseng
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Ming-Daw Tsai
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - Yane-Shih Wang
- Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan.,Chemical Biology and Molecular Biophysics Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei 10617, Taiwan
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24
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An Efficient Ni/Pd Catalyzed Chemoselective Synthesis of 1,3,2‐Benzodiazaborininones from Boronic Acids and Anthranilamides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900827] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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