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Douglas CD, Grandinetti L, Easton NM, Kuehm OP, Hayden JA, Hamilton MC, St Maurice M, Bearne SL. Slow-Onset, Potent Inhibition of Mandelate Racemase by 2-Formylphenylboronic Acid. An Unexpected Adduct Clasps the Catalytic Machinery. Biochemistry 2021; 60:2508-2518. [PMID: 34339165 DOI: 10.1021/acs.biochem.1c00374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
o-Carbonyl arylboronic acids such as 2-formylphenylboronic acid (2-FPBA) are employed in biocompatible conjugation reactions with the resulting iminoboronate adduct stabilized by an intramolecular N-B interaction. However, few studies have utilized these reagents as active site-directed enzyme inhibitors. We show that 2-FPBA is a potent reversible, slow-onset inhibitor of mandelate racemase (MR), an enzyme that has served as a valuable paradigm for understanding enzyme-catalyzed abstraction of an α-proton from a carbon acid substrate with a high pKa. Kinetic analysis of the progress curves for the slow onset of inhibition of wild-type MR using a two-step kinetic mechanism gave Ki and Ki* values of 5.1 ± 1.8 and 0.26 ± 0.08 μM, respectively. Hence, wild-type MR binds 2-FPBA with an affinity that exceeds that for the substrate by ∼3000-fold. K164R MR was inhibited by 2-FPBA, while K166R MR was not inhibited, indicating that Lys 166 was essential for inhibition. Unexpectedly, mass spectrometric analysis of the NaCNBH3-treated enzyme-inhibitor complex did not yield evidence of an iminoboronate adduct. 11B nuclear magnetic resonance spectroscopy of the MR·2-FPBA complex indicated that the boron atom was sp3-hybridized (δ 6.0), consistent with dative bond formation. Surprisingly, X-ray crystallography revealed the formation of an Nζ-B dative bond between Lys 166 and 2-FPBA with intramolecular cyclization to form a benzoxaborole, rather than the expected iminoboronate. Thus, when o-carbonyl arylboronic acid reagents are employed to modify proteins, the structure of the resulting product depends on the protein architecture at the site of modification.
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Affiliation(s)
- Colin D Douglas
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Lia Grandinetti
- Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Nicole M Easton
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Oliver P Kuehm
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Joshua A Hayden
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Meghan C Hamilton
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Martin St Maurice
- Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin 53201-1881, United States
| | - Stephen L Bearne
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
- Department of Chemistry, Dalhousie University, Halifax, NS B3H 4R2, Canada
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Groleau RR, James TD, Bull SD. The Bull-James assembly: Efficient iminoboronate complex formation for chiral derivatization and supramolecular assembly. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213599] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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3
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Modification of Kagan's amide for improved activity as Chiral Solvating Agent in enantiodiscrimination during NMR analysis. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.11.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Arya N, Mishra SK, Suryaprakash N. A simple ternary ion-pair complexation protocol for testing the enantiopurity and the absolute configurational analysis of acid and ester derivatives. NEW J CHEM 2018. [DOI: 10.1039/c8nj01489b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ternary ion-pair complexation protocol for rapid testing of the enantiopurity and the assignment of absolute configurations of various acid and ester derivatives.
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Affiliation(s)
- Neeru Arya
- NMR Research Centre and Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - Sandeep Kumar Mishra
- NMR Research Centre and Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - N. Suryaprakash
- NMR Research Centre and Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
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Mishra SK, Suryaprakash N. Some new protocols for the assignment of absolute configuration by NMR spectroscopy using chiral solvating agents and CDAs. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.09.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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6
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Assignment of the absolute configuration of hydroxy acids using 1H NMR spectroscopy: a simple and rapid approach. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.01.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Oliveira SS, Cunha RL, Silva MS. 77Se and 125Te NMR spectroscopy for enantiopurity determination of chalcogen amines. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.091] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lakshmipriya A, Chaudhari SR, Suryaprakash N. p-TsOH promotes 2′-amino-[1,1′-binaphthalene]-2-ol as a chiral solvating agent. NEW J CHEM 2016. [DOI: 10.1039/c6nj02101h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Ternary complex of p-TsOH, NOBIN with hydroxy acids and their derivatives permit NMR spectroscopic chiral discrimination.
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Affiliation(s)
- A. Lakshmipriya
- NMR Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
- Solid State and Structural Chemistry Unit
| | | | - N. Suryaprakash
- NMR Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
- Solid State and Structural Chemistry Unit
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Bian G, Yang S, Huang H, Zong H, Song L, Fan H, Sun X. Chirality sensing of tertiary alcohols by a novel strong hydrogen-bonding donor - selenourea. Chem Sci 2015; 7:932-938. [PMID: 29899892 PMCID: PMC5953003 DOI: 10.1039/c5sc03780h] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 10/20/2015] [Indexed: 12/19/2022] Open
Abstract
In this paper, a novel type of chiral bisselenourea sensor was first synthesized and used as a strong hydrogen-bonding donor for highly efficient chiral recognition of a diverse range of tertiary alcohols.
Chemical sensors are powerful for the fast recognition of chiral compounds. However, the established sensing systems are less effective for chiral tertiary alcohols. The chiral tertiary alcohol group is an important structural unit in natural products and drug molecules, and its enantioselective recognition represents a significant and challenging task. In this paper, a novel type of chiral bisselenourea sensor was first synthesized and used as a strong hydrogen-bonding donor for highly efficient chiral recognition of a diverse range of tertiary alcohols. The obtained sharply split NMR signals are well-distinguishable with a large (up to 0.415 ppm) chemical shift nonequivalence. The NMR signal of the hydroxyl hydrogen atom was first employed for enantiomeric excess determination of tertiary alcohols, giving accurate results with <2% absolute errors. The 2D NOESY spectra and computational studies suggest that the geometrical differentiation of the formed diastereomeric complexes between the sensor and tertiary alcohols enables the chiral discrimination of the hydroxyl hydrogen signals of the tertiary alcohol in the 1H NMR spectrum.
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Affiliation(s)
- Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .
| | - Shiwei Yang
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .
| | - Huayin Huang
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .
| | - Hua Zong
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .
| | - Hongjun Fan
- The State Key Lab of Molecular Reaction Dynamics , Dalian Institute of Chemical Physics (iCheM) , Chinese Academy of Sciences , Dalian , Liaoning 116023 , P. R. China .
| | - Xiaoqiang Sun
- School of Petrochemical Engineering , Changzhou University , Changzhou , Jiangsu 213164 , P. R. China .
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