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A review on l-ribose isomerases for the biocatalytic production of l-ribose and l-ribulose. Food Res Int 2021; 145:110409. [PMID: 34112412 DOI: 10.1016/j.foodres.2021.110409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 04/08/2021] [Accepted: 05/06/2021] [Indexed: 11/21/2022]
Abstract
Presently, because of the extraordinary roles and potential applications, rare sugars turn into a focus point for countless researchers in the field of carbohydrates. l-ribose and l-ribulose are rare sugars and isomers of each other. This aldo and ketopentose are expensive but can be utilized as an antecedent for the manufacturing of various rare sugars and l-nucleoside analogue. The bioconversion approach turns into an excellent alternative method to l-ribulose and l-ribose production, as compared to the complex and lengthy chemical methods. The basic purpose of this research was to describe the importance of rare sugars in various fields and their easy production by using enzymatic methods. l-Ribose isomerase (L-RI) is an enzyme discovered by Tsuyoshi Shimonishi and Ken Izumori in 1996 from Acinetobacter sp. strain DL-28. L-RI structure was cupin-type-β-barrel shaped with a catalytic site between two β-sheets surrounded by metal ions. The crystal structures of the L-RI showed that it contains a homotetramer structure. Current review have concentrated on the sources, characteristics, applications, conclusions and future prospects including the potentials of l-ribose isomerase for the commercial production of l-ribose and l-ribulose. The MmL-RIse and CrL-RIse have the potential to produce the l-ribulose up to 32% and 31%, respectively. The CrL-RIse is highly stable as compared to other L-RIs. The results explained that the L-RIs have great potential in the production of rare sugars especially, l-ribose and l-ribulose, while the immobilization technique can enhance its functionality and properties. The present study precises the applications of L-RIs acquired from various sources for l-ribose and l-ribulose production.
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2
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Du Z, Li G, Ge H, Zhou X, Zhang J. Design, Synthesis and Biological Evaluation of Steroidal Glycoconjugates as Potential Antiproliferative Agents. ChemMedChem 2021; 16:1488-1498. [PMID: 33476082 DOI: 10.1002/cmdc.202000966] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/19/2021] [Indexed: 01/06/2023]
Abstract
To systematically evaluate the impact of neoglycosylation upon the anticancer activities and selectivity of steroids, four series of neoglycosides of diosgenin, pregnenolone, dehydroepiandrosterone and estrone were designed and synthesized according to the neoglycosylation approach. The structures of all the products were elucidated by NMR analysis, and the stereochemistry of C20-MeON-pregnenolone was confirmed by crystal X-ray diffraction. The compounds' cytotoxicity on five human cancer cell lines was evaluated using a Cell Counting Kit-8 assay, and structure-activity relationships (SAR) are discussed. 2-deoxy-d-glucoside 5 k displayed the most potent antiproliferative activities against HepG2 cells with an IC50 value of 1.5 μM. Further pharmacological experiments on compound 5 k on HepG2 cells revealed that it could cause morphological changes and cell-cycle arrest at the G0/G1 phase and then induced the apoptosis, which might be associated with the enhanced expression of high-mobility group Box 1 (HMGB1). Taken together, these findings prove that the neoglycosylation of steroids could be a promising strategy for the discovery of potential antiproliferative agents.
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Affiliation(s)
- Zhichao Du
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 210009, P. R. China
| | - Guolong Li
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, Jiangsu, 211198, P. R. China
| | - Haixia Ge
- School of Life Sciences, Huzhou University, Huzhou, Zhejiang, 313000, P. R. China
| | - Xiaoyang Zhou
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 210009, P. R. China
| | - Jian Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 210009, P. R. China.,ZhenPing Expert Workstation for Zhang Jian Zhenping, Ankang, Shaanxi, 725699, P. R. China
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3
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Goel B, Tripathi N, Mukherjee D, Jain SK. Glycorandomization: A promising diversification strategy for the drug development. Eur J Med Chem 2021; 213:113156. [PMID: 33460832 DOI: 10.1016/j.ejmech.2021.113156] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/04/2021] [Accepted: 01/04/2021] [Indexed: 12/13/2022]
Abstract
Glycorandomization is a natural product derivatization strategy in which different sugar moieties are linked to the aglycone part of the naturally existing glycosides to create glycorandomized libraries. Sugars attached to the natural products are responsible for affecting their solubility, mechanism of action, target recognition, and toxicity and thus, by changing the sugar part, these properties could be modified. Glycorandomization can be done via two approaches (i) a synthetic approach known as neoglycorandomization, and (ii) chemoenzymatic approach including in-vitro and in-vivo glycorandomization. Glycorandomization can be a promising technology for the drug discovery that has proved its potential to improve pharmacokinetic (solubility) and pharmacodynamic profile (mechanism of action, toxicity, and target recognition) of the parent compounds. The substrate flexibility of glycosyltransferases and other enzymes towards sugars and/or aglycone substrates has made this technique versatile. Further, the enzymes can be altered by genetic engineering to generate glycorandomized libraries of diverse natural product scaffolds. This technique has the potential to produce new compounds that can be helpful to the mankind by treating the threatening disease states. This review covers the different strategies for glycorandomization as a tool in drug discovery and development. The fundamentals of glycorandomization, different types, and further development of differentially glycorandomized libraries of natural products and small molecule based drugs have been discussed.
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Affiliation(s)
- Bharat Goel
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India
| | - Nancy Tripathi
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India
| | - Debaraj Mukherjee
- Natural Product Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India
| | - Shreyans K Jain
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India.
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4
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Ghosh T, Mukherji A, Srivastava HK, Kancharla PK. Secondary amine salt catalyzed controlled activation of 2-deoxy sugar lactols towards alpha-selective dehydrative glycosylation. Org Biomol Chem 2019; 16:2870-2875. [PMID: 29633773 DOI: 10.1039/c8ob00423d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A new organocatalytic glycosylation method exploiting the lactol functionality has been disclosed. The catalytic generation of glycosyl oxacarbenium ions from lactols under forcible conditions via weakly Brønsted-acidic, readily available secondary amine salts affects the diastereoselective glycosylation of 2-deoxypyranoses and furanoses. This operationally simple iminium catalyzed activation of 2-deoxy hemi-acetals is a potential alternative to the existing cumbersome methods that need specialized handling. The mechanisms for this unique transformation and kinetic/thermodynamic effects have been discussed based on both experimental evidence and theoretical studies.
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Affiliation(s)
- Titli Ghosh
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
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5
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Shiina I, Miesch M, Peter C, Geoffroy P, Murata T, Tonoi T. Diastereo–/Enantioselective Diels–Alder Synthesis of 14β-Hydroxysteroid Scaffolds: A Combined Experimental and DFT Study. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)99] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Ukiya M, Hayakawa T, Okazaki K, Hikawa M, Akazawa H, Li W, Koike K, Fukatsu M. Synthesis of Lanostane-Type Triterpenoid N
-Glycosides and Their Cytotoxicity against Human Cancer Cell Lines. Chem Biodivers 2018; 15:e1800113. [DOI: 10.1002/cbdv.201800113] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 05/01/2018] [Indexed: 01/06/2023]
Affiliation(s)
- Motohiko Ukiya
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
| | - Teppei Hayakawa
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
| | - Kouta Okazaki
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
| | - Maiko Hikawa
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
| | - Hiroyuki Akazawa
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
| | - Wei Li
- Faculty of Pharmaceutical Science; Toho University; 2-2-1 Miyama Funabashi-shi, Chiba 274-8510 Japan
| | - Kazuo Koike
- Faculty of Pharmaceutical Science; Toho University; 2-2-1 Miyama Funabashi-shi, Chiba 274-8510 Japan
| | - Makoto Fukatsu
- College of Science and Technology; Nihon University; 1-8-14 Kanda Surugadai Chiyoda-ku, Tokyo 101-8308 Japan
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7
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Villadsen K, Martos-Maldonado MC, Jensen KJ, Thygesen MB. Chemoselective Reactions for the Synthesis of Glycoconjugates from Unprotected Carbohydrates. Chembiochem 2017; 18:574-612. [DOI: 10.1002/cbic.201600582] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Klaus Villadsen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Manuel C. Martos-Maldonado
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Knud J. Jensen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Mikkel B. Thygesen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
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8
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Zeng J, Sun G, Wang R, Zhang S, Teng S, Liao Z, Meng L, Wan Q. Gold-catalyzed diversified synthesis of 3-aminosugar analogues of digitoxin and digoxin. Org Chem Front 2017. [DOI: 10.1039/c7qo00648a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A small library containing 3-aminosugar analogues of digitoxin and digoxin with potent anticancer activities was constructed by gold-catalyzed glycosylation.
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Affiliation(s)
- Jing Zeng
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Guangfei Sun
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Ruobin Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Shuxin Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Shuang Teng
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Zhiwen Liao
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Lingkui Meng
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
| | - Qian Wan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation
- School of Pharmacy; Huazhong University of Science and Technology
- Wuhan
- China
- Institute of Brain Research
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9
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Baudendistel OR, Wieland DE, Schmidt MS, Wittmann V. Real-Time NMR Studies of Oxyamine Ligations of Reducing Carbohydrates under Equilibrium Conditions. Chemistry 2016; 22:17359-17365. [DOI: 10.1002/chem.201603369] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Oliver R. Baudendistel
- Department of Chemistry; Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Daniel E. Wieland
- Department of Chemistry; Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Magnus S. Schmidt
- Department of Chemistry; Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
| | - Valentin Wittmann
- Department of Chemistry; Konstanz Research School Chemical Biology (KoRS-CB); University of Konstanz; 78457 Konstanz Germany
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10
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Peter C, Ressault B, Geoffroy P, Miesch M. Concise Approach to (ent)-14 β-Hydroxysteroids through Highly Diastereo-/Enantioselective Diels-Alder Reactions. Chemistry 2016; 22:10808-12. [PMID: 27192692 DOI: 10.1002/chem.201601926] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 11/07/2022]
Abstract
14β-Hydroxysteroids, especially 14β-hydroxyandrostane derivatives are closely related to the cardenolide skeletons. The latter were readily available through highly diastero/enantioselective Diels-Alder (DA) reactions requiring high pressure or Lewis acid activation. Moreover, in the presence of (R)- or (S)-carvone as a chiral dienophile, the DA-reaction takes place under chemodivergent parallel kinetic resolution control affording highly enantiomerically enriched 14β-hydroxysteroid derivatives or the corresponding (ent)-14β-hydroxysteroid derivatives.
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Affiliation(s)
- Clovis Peter
- Université de Strasbourg, Institut de Chimie - UMR 7177, 1 rue Blaise Pascal, BP296/R8-67008, Strasbourg Cedex, France
| | - Blandine Ressault
- Université de Strasbourg, Institut de Chimie - UMR 7177, 1 rue Blaise Pascal, BP296/R8-67008, Strasbourg Cedex, France
| | - Philippe Geoffroy
- Université de Strasbourg, Institut de Chimie - UMR 7177, 1 rue Blaise Pascal, BP296/R8-67008, Strasbourg Cedex, France
| | - Michel Miesch
- Université de Strasbourg, Institut de Chimie - UMR 7177, 1 rue Blaise Pascal, BP296/R8-67008, Strasbourg Cedex, France.
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11
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Nandurkar NS, Zhang J, Ye Q, Ponomareva LV, She QB, Thorson JS. The identification of perillyl alcohol glycosides with improved antiproliferative activity. J Med Chem 2014; 57:7478-84. [PMID: 25121720 PMCID: PMC4161159 DOI: 10.1021/jm500870u] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
![]()
A facile
route to perillyl alcohol (POH) differential glycosylation
and the corresponding synthesis of a set of 34 POH glycosides is reported.
Subsequent in vitro studies revealed a sugar dependent antiproliferative
activity and the inhibition of S6 ribosomal protein phosphorylation
as a putative mechanism of representative POH glycosides. The most
active glycoside from this cumulative study (4′-azido-d-glucoside, PG9) represents one of the most cytotoxic
POH analogues reported to date.
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Affiliation(s)
- Nitin S Nandurkar
- Center for Pharmaceutical Research and Innovation, College of Pharmacy, University of Kentucky , 789 South Limestone Street, Lexington, Kentucky 40536-0596, United States
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12
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Goff RD, Thorson JS. Neoglycosylation and neoglycorandomization: Enabling tools for the discovery of novel glycosylated bioactive probes and early stage leads. MEDCHEMCOMM 2014; 5:1036-1047. [PMID: 25071927 PMCID: PMC4111257 DOI: 10.1039/c4md00117f] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This review focuses upon the development, scope, and utility of the highly versatile chemoselective alkoxyamine-based 'neoglycosylation' reaction first described by Peri and Dumy. The fundamentals of neoglycosylation and the subsequent development of a 'neoglycorandomization' platform to afford differentially-glycosylated libraries of plant-based natural products, microbial-based natural products, and small molecule-based drugs for drug discovery applications are discussed.
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Affiliation(s)
- Randal D. Goff
- Western Wyoming Community College, 2500 College Dr. Rock Springs, WY 82902-0428, USA
| | - Jon. S. Thorson
- Center for Pharmaceutical Research and Innovation, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA
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13
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Ishida J, Hinou H, Naruchi K, Nishimura SI. Synthesis of neoglycosphingolipid from methoxyamino-functionalized ceramide. Bioorg Med Chem Lett 2014; 24:1197-200. [DOI: 10.1016/j.bmcl.2013.12.091] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 12/19/2013] [Accepted: 12/20/2013] [Indexed: 01/03/2023]
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14
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Baryal KN, Adhikari S, Zhu J. Catalytic Stereoselective Synthesis of β-Digitoxosides: Direct Synthesis of Digitoxin and C1′-epi-Digitoxin. J Org Chem 2013; 78:12469-76. [DOI: 10.1021/jo4021419] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kedar N. Baryal
- Department
of Chemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 West Bancroft Street, Toledo, Ohio 43606, United States
| | - Surya Adhikari
- Department
of Chemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 West Bancroft Street, Toledo, Ohio 43606, United States
| | - Jianglong Zhu
- Department
of Chemistry and School of Green Chemistry and Engineering, The University of Toledo, 2801 West Bancroft Street, Toledo, Ohio 43606, United States
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15
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Loskot SA, Zhang J, Langenhan JM. Nucleophilic catalysis of MeON-neoglycoside formation by aniline derivatives. J Org Chem 2013; 78:12189-93. [PMID: 24180591 DOI: 10.1021/jo401688p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Neoglycosylations are increasingly being employed in the synthesis of natural products, drug candidates, glycopeptide mimics, oligosaccharide analogues, and other applications, but the efficiency of these reactions is usually limited by slow reaction times. Here, we show that aniline derivatives such as 2-amino-5-methoxybenzoic acid enhance the rate of acid-catalyzed neoglycosylation for a range of sugar substrates up to a factor of 32 relative to the uncatalyzed reaction.
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Affiliation(s)
- Steven A Loskot
- Department of Chemistry, Seattle University , Seattle, Washington 98122, United States
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16
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Zhang J, Ponomareva LV, Marchillo K, Zhou M, Andes DR, Thorson JS. Synthesis and antibacterial activity of doxycycline neoglycosides. JOURNAL OF NATURAL PRODUCTS 2013; 76:1627-36. [PMID: 23987662 PMCID: PMC3814126 DOI: 10.1021/np4003096] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A set of 37 doxycycline neoglycosides were prepared, mediated via a C-9 alkoxyamino-glycyl-based spacer reminiscent of that of tigecycline. Subsequent in vitro antibacterial assays against representative drug-resistant Gram negative and Gram positive strains revealed a sugar-dependent activity profile and one doxycycline neoglycoside, the 2'-amino-α-D-glucoside conjugate, to rival that of the parent pharmacophore. In contrast, the representative tetracycline-susceptible strain E. coli 25922 was found to be relatively responsive to a range of doxycycline neoglycosides. This study also extends the use of aminosugars in the context of neoglycosylation via a simple two-step strategy anticipated to be broadly applicable for neoglycorandomization.
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Affiliation(s)
- Jianjun Zhang
- Center for Pharmaceutical Research and Innovation, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536-0596, United States
| | - Larissa V. Ponomareva
- Center for Pharmaceutical Research and Innovation, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536-0596, United States
| | - Karen Marchillo
- Department of Medicine and Medical Microbiology and Immunology, University of Wisconsin-Madison, 1685 Highland Avenue, Madison, Wisconsin, 53705-2281, United States
| | - Maoquan Zhou
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705-2222, United States
| | - David R. Andes
- Department of Medicine and Medical Microbiology and Immunology, University of Wisconsin-Madison, 1685 Highland Avenue, Madison, Wisconsin, 53705-2281, United States
| | - Jon S. Thorson
- Center for Pharmaceutical Research and Innovation, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, Kentucky 40536-0596, United States
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17
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Stability of aminooxy glycosides to glycosidase catalysed hydrolysis. Carbohydr Res 2013; 377:1-3. [PMID: 23764956 DOI: 10.1016/j.carres.2013.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 05/09/2013] [Accepted: 05/10/2013] [Indexed: 11/20/2022]
Abstract
The stability of the amino(methoxy) beta-glycosidic bond to glycosidase catalysed hydrolysis is reported. Beta-O-benzyl glucose and beta-O-benzyl galactose are substrates hydrolysed by beta-glucosidase and beta-galactosidase from almonds and Escherichia coli, respectively. However their beta-N-benzyl-(O-methoxy)-glucoside and beta-N-benzyl-(O-methoxy)-galactoside derivatives are competitive inhibitors.
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18
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Beale TM, Taylor MS. Synthesis of Cardiac Glycoside Analogs by Catalyst-Controlled, Regioselective Glycosylation of Digitoxin. Org Lett 2013; 15:1358-61. [DOI: 10.1021/ol4003042] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas M. Beale
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto ON M5S 3H6, Canada
| | - Mark S. Taylor
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto ON M5S 3H6, Canada
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19
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Langenhan JM, Mullarky E, Rogalsky DK, Rohlfing JR, Tjaden AE, Werner HM, Rozal LM, Loskot SA. Amphimedosides A–C: Synthesis, Chemoselective Glycosylation, And Biological Evaluation. J Org Chem 2013; 78:1670-6. [DOI: 10.1021/jo302640y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Joseph M. Langenhan
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Edouard Mullarky
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Derek K. Rogalsky
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - James R. Rohlfing
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Anja E. Tjaden
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Halina M. Werner
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Leonardo M. Rozal
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
| | - Steven A. Loskot
- Department of Chemistry, Seattle University, Seattle, Washington 98122, United States
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20
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Zhou M, Hou Y, Hamza A, Pain C, Zhan CG, Bugni TS, Thorson JS. Probing the regiospecificity of enzyme-catalyzed steroid glycosylation. Org Lett 2012; 14:5424-7. [PMID: 23075289 DOI: 10.1021/ol3024924] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The potential of a uniquely permissive engineered glycosyltransferase (OleD ASP) as a catalyst for steroid glycosylation is highlighted. The ability of OleD ASP to glucosylate a range of cardenolides and bufadienolides was assessed using a rapid LC-UV/MS-SPE-NMR analytical platform. While a bias toward OleD-catalyzed C3 monoglucosylation was observed, subtle alterations of the steroidal architecture, in some cases, invoked diglucosylation or, in one case (digoxigenin), C12 glucosylation. This latter case represents the first, and highly efficient, synthesis of digoxigenin 12-O-β-D-glucoside.
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Affiliation(s)
- Maoquan Zhou
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, USA
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Peltier-Pain P, Marchillo K, Zhou M, Andes DR, Thorson JS. Natural product disaccharide engineering through tandem glycosyltransferase catalysis reversibility and neoglycosylation. Org Lett 2012; 14:5086-9. [PMID: 22984807 PMCID: PMC3489467 DOI: 10.1021/ol3023374] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A two-step strategy for disaccharide modulation using vancomycin as a model is reported. The strategy relies upon a glycosyltransferase-catalyzed 'reverse' reaction to enable the facile attachment of an alkoxyamine-bearing sugar to the vancomycin core. Neoglycosylation of the corresponding aglycon led to a novel set of vancomycin 1,6-disaccharide variants. While the in vitro antibacterial properties of corresponding vancomycin 1,6-disaccharide analogs were equipotent to the parent antibiotic, the chemoenzymatic method presented is expected to be broadly applicable.
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Affiliation(s)
- Pauline Peltier-Pain
- Pharmaceutical Sciences Division, School of Pharmacy, Wisconsin Center for Natural Products Research, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705-2222, USA
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22
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23
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Elbaz HA, Stueckle TA, Tse W, Rojanasakul Y, Dinu CZ. Digitoxin and its analogs as novel cancer therapeutics. Exp Hematol Oncol 2012; 1:4. [PMID: 23210930 PMCID: PMC3506989 DOI: 10.1186/2162-3619-1-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Accepted: 04/05/2012] [Indexed: 01/18/2023] Open
Abstract
A growing body of evidence indicates that digitoxin cardiac glycoside is a promising anticancer agent when used at therapeutic concentrations. Digitoxin has a prolonged half-life and a well-established clinical profile. New scientific avenues have shown that manipulating the chemical structure of the saccharide moiety of digitoxin leads to synthetic analogs with increased cytotoxic activity. However, the anticancer mechanism of digitoxin or synthetic analogs is still subject to study while concerns about digitoxin's cardiotoxicity preclude its clinical application in cancer therapeutics. This review focuses on digitoxin and its analogs, and their cytotoxicity against cancer cells. Moreover, a new perspective on the pharmacological aspects of digitoxin and its analogs is provided to emphasize new research directions for developing potent chemotherapeutic drugs.
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Affiliation(s)
- Hosam A Elbaz
- Department of Basic Pharmaceutical Sciences, West Virginia University, Morgantown, WV, USA.
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24
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Synthesis and biological evaluation of RON-neoglycosides as tumor cytotoxins. Carbohydr Res 2011; 346:2663-76. [DOI: 10.1016/j.carres.2011.09.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 09/13/2011] [Accepted: 09/19/2011] [Indexed: 11/21/2022]
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25
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Ma Y, Li Z, Shi H, Zhang J, Yu B. Assembly of digitoxin by gold(I)-catalyzed glycosidation of glycosyl o-alkynylbenzoates. J Org Chem 2011; 76:9748-56. [PMID: 22054226 DOI: 10.1021/jo201850z] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Digitoxin, a clinically important cardiac trisaccharide, was assembled efficiently from digitoxigenin and 3,4-di-O-tert-butyldiphenylsilyl-d-digitoxosyl o-cyclopropylethynylbenzoate in 9 steps and 52% overall yield via alternate glycosylation and protecting group manipulation. The present synthesis showcases the advantage of the gold(I)-catalyzed glycosylation protocol in the synthesis of glycoconjugates containing acid-labile 2-deoxysugar linkages.
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Affiliation(s)
- Yuyong Ma
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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26
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Elbaz HA, Stueckle TA, Wang HYL, O'Doherty GA, Lowry DT, Sargent LM, Wang L, Dinu CZ, Rojanasakul Y. Digitoxin and a synthetic monosaccharide analog inhibit cell viability in lung cancer cells. Toxicol Appl Pharmacol 2011; 258:51-60. [PMID: 22037315 DOI: 10.1016/j.taap.2011.10.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 10/03/2011] [Accepted: 10/06/2011] [Indexed: 10/16/2022]
Abstract
Mechanisms of digitoxin-inhibited cell growth and induced apoptosis in human non-small cell lung cancer (NCI-H460) cells remain unclear. Understanding how digitoxin or derivate analogs induce their cytotoxic effect below therapeutically relevant concentrations will help in designing and developing novel, safer and more effective anti-cancer drugs. In this study, NCI-H460 cells were treated with digitoxin and a synthetic analog D6-MA to determine their anti-cancer activity. Different concentrations of digitoxin and D6-MA were used and the subsequent changes in cell morphology, viability, cell cycle, and protein expressions were determined. Digitoxin and D6-MA induced dose-dependent apoptotic morphologic changes in NCI-H460 cells via caspase-9 cleavage, with D6-MA possessing 5-fold greater potency than digitoxin. In comparison, non-tumorigenic immortalized bronchial and small airway epithelial cells displayed significantly less apoptotic sensitivity compared to NCI-H460 cells suggesting that both digitoxin and D6-MA were selective for NSCLC. Furthermore, NCI-H460 cells arrested in G(2)/M phase following digitoxin and D6-MA treatment. Post-treatment evaluation of key G2/M checkpoint regulatory proteins identified down-regulation of cyclin B1/cdc2 complex and survivin. Additionally, Chk1/2 and p53 related proteins experienced down-regulation suggesting a p53-independent cell cycle arrest mechanism. In summary, digitoxin and D6-MA exert anti-cancer effects on NCI-H460 cells through apoptosis or cell cycle arrest, with D6-MA showing at least 5-fold greater potency relative to digitoxin.
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Affiliation(s)
- Hosam A Elbaz
- Department of Basic Pharmaceutical Sciences, West Virginia University, Morgantown, WV 26506, USA
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Peltier-Pain P, Timmons SC, Grandemange A, Benoit E, Thorson JS. Warfarin glycosylation invokes a switch from anticoagulant to anticancer activity. ChemMedChem 2011; 6:1347-50. [PMID: 21714096 PMCID: PMC3217245 DOI: 10.1002/cmdc.201100178] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Pauline Peltier-Pain
- Laboratory for Biosynthetic Chemistry, University of Wisconsin National Cooperative Drug Discovery Group Program, Pharmaceutical Sciences Division, School of Pharmacy, 777 Highland Avenue, Madison, WI 53705, (USA)
| | - Shannon C. Timmons
- Laboratory for Biosynthetic Chemistry, University of Wisconsin National Cooperative Drug Discovery Group Program, Pharmaceutical Sciences Division, School of Pharmacy, 777 Highland Avenue, Madison, WI 53705, (USA)
| | - Agnès Grandemange
- Université de Lyon, VetAgro Sup, USC 1233, INRA, 69280 Marcy l’Etoile, (France)
| | - Etienne Benoit
- Université de Lyon, VetAgro Sup, USC 1233, INRA, 69280 Marcy l’Etoile, (France)
| | - Jon S. Thorson
- Laboratory for Biosynthetic Chemistry, University of Wisconsin National Cooperative Drug Discovery Group Program, Pharmaceutical Sciences Division, School of Pharmacy, 777 Highland Avenue, Madison, WI 53705, (USA)
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28
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Goff RD, Singh S, Thorson JS. Glycosyloxyamine neoglycosylation: a model study using calicheamicin. ChemMedChem 2011; 6:774-6. [PMID: 21520418 DOI: 10.1002/cmdc.201100028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Randal D Goff
- Wisconsin Center for Natural Products Research, UW National Cooperative Drug Discovery Group, University of Wisconsin-Madison, School of Pharmacy, Madison, WI 53705, USA
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29
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Synthesis and evaluation of cardiac glycoside mimics as potential anticancer drugs. Bioorg Med Chem 2011; 19:2407-17. [PMID: 21421322 DOI: 10.1016/j.bmc.2011.02.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 02/04/2011] [Accepted: 02/09/2011] [Indexed: 11/23/2022]
Abstract
The cardiac glycoside digitoxin, consisting of a steroid core linked to a labile trisaccharide, has been used for centuries for the treatment of congestive heart failure. The well known pharmacological effect is a result of the ability of cardiac glycosides to inhibit the Na(+), K(+)-ATPase. Within recent years cardiac glycosides have furthermore been suggested to possess valuable anticancer activity. To mimic the labile trisaccharide of digitoxin with a stabile carbohydrate surrogate, we have used sulfur linked ethylene glycol moieties of varying length (mono-, di-, tri- or tetra-ethylene glycol), and furthermore used these linkers as handles for the synthesis of bivalent steroids. The prepared compounds were evaluated for their potencies to inhibit the Na(+), K(+)-ATPase and for their cytotoxic effect on cancerous MCF-7 cells. A clear trend is observed in both inhibition and cytotoxic effect, where the bioactivity decreases as the size increases. The most potent Na(+), K(+)-ATPase inhibitors are the compounds with the shortest ethylene glycol chain (K(app) 0.48 μM) and thiodigitoxigenin (K(app) 0.42 μM), which both are comparable with digitoxigenin (K(app) 0.52 μM). For the cancer cell viability assay the shortest mimics were found to have highest efficacy, with the best ligand having a monoethylene glycol unit (IC(50) 0.24 μM), which was slightly better than digitoxigenin (IC(50) 0.64 μM), while none of the novel cardiac glycoside mimics display an in vitro effect as high as digitoxin (IC(50) 0.02 μM).
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Gantt RW, Peltier-Pain P, Thorson JS. Enzymatic methods for glyco(diversification/randomization) of drugs and small molecules. Nat Prod Rep 2011; 28:1811-53. [DOI: 10.1039/c1np00045d] [Citation(s) in RCA: 194] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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31
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Goff RD, Thorson JS. Assessment of chemoselective neoglycosylation methods using chlorambucil as a model. J Med Chem 2010; 53:8129-39. [PMID: 20973561 DOI: 10.1021/jm101024j] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To systematically assess the impact of glycosylation and the corresponding chemoselective linker upon the anticancer activity/selectivity of the drug chlorambucil, herein we report the synthesis and anticancer activities of a 63-member library of chlorambucil-based neoglycosides. A comparison of N-alkoxyamine-, N-acylhydrazine-, and N-hydroxyamine-based chemoselective glycosylation of chlorambucil revealed sugar- and linker-dependent partitioning among open- and closed-ring neoglycosides and corresponding sugar-dependent variant biological activity. Cumulatively, this study represents the first neoglycorandomization of a synthetic drug and expands our understanding of the impact of sugar structure upon product distribution/equilibria in the context of N-alkoxyamino-, N-hydroxyamino-, and N-acylhydrazine-based chemoselective glycosylation. This study also revealed several analogues with increased in vitro anticancer activity, most notably D-threoside 60 (NSC 748747), which displayed much broader tumor specificity and notably increased potency over the parent drug.
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Affiliation(s)
- Randal D Goff
- Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705, USA
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32
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Carrasco MR, Alvarado CI, Dashner ST, Wong AJ, Wong MA. Synthesis of Aminooxy and N-Alkylaminooxy Amines for Use in Bioconjugation. J Org Chem 2010; 75:5757-9. [DOI: 10.1021/jo101066c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Michael R. Carrasco
- Department of Chemistry and Biochemistry, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0270
| | - Carolina I. Alvarado
- Department of Chemistry and Biochemistry, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0270
| | - Scott T. Dashner
- Department of Chemistry and Biochemistry, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0270
| | - Amanda J. Wong
- Department of Chemistry and Biochemistry, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0270
| | - Michael A. Wong
- Department of Chemistry and Biochemistry, Santa Clara University, 500 El Camino Real, Santa Clara, California 95053-0270
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33
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Iyer AKV, Zhou M, Azad N, Elbaz H, Wang L, Rogalsky DK, Rojanasakul Y, O'Doherty GA, Langenhan JM. A Direct Comparison of the Anticancer Activities of Digitoxin MeON-Neoglycosides and O-Glycosides: Oligosaccharide Chain Length-Dependent Induction of Caspase-9-Mediated Apoptosis. ACS Med Chem Lett 2010; 1:326-330. [PMID: 21103068 DOI: 10.1021/ml1000933] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Digitoxin is a cardiac glycoside currently being investigated for potential use in oncology. While a number of structure-activity relationship studies have been conducted, an investigation of anticancer activity as a function of oligosaccharide chain length has not yet been performed. We generated mono-, di-, and tri-O-digitoxoside derivatives of digitoxin and compared their activity to the corresponding MeON-neoglycosides. Both classes of cardenolide derivatives display comparable oligosaccharide chain length-dependent cytotoxicity toward human cancer cell lines. Further investigation revealed that both classes of compounds induce caspase-9-mediated apoptosis in non-small cell lung cancer cells (NCI-H460). Since O-glycosides and MeON-neoglycosides share a similar mode of action, the convenience of MeON-neoglycosylation could be exploited in future SAR work to rapidly survey large numbers of carbohydrates to prioritize selected O-glycoside candidates for traditional synthesis.
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Affiliation(s)
| | | | - Neelam Azad
- Department of Pharmaceutical Sciences, Hampton University, Hampton, Virginia 23668
| | | | | | - Derek K. Rogalsky
- Department of Chemistry, Seattle University, Seattle, Washington 98122
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35
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Williams GJ, Gantt RW, Thorson JS. The impact of enzyme engineering upon natural product glycodiversification. Curr Opin Chem Biol 2009; 12:556-64. [PMID: 18678278 DOI: 10.1016/j.cbpa.2008.07.013] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Accepted: 07/07/2008] [Indexed: 12/20/2022]
Abstract
Glycodiversification of natural products is an effective strategy for small molecule drug development. Recently, improved methods for chemo-enzymatic synthesis of glycosyl donors has spurred the characterization of natural product glycosyltransferases (GTs), revealing that the substrate specificity of many naturally occurring GTs as too stringent for use in glycodiversification. Protein engineering of natural product GTs has emerged as an attractive approach to overcome this limitation. This review highlights recent progress in the engineering/evolution of enzymes relevant to natural product glycodiversification with a particular focus upon GTs.
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Affiliation(s)
- Gavin J Williams
- Laboratory for Biosynthetic Chemistry, Pharmaceutical Sciences Division, School of Pharmacy, National Cooperative Drug Discovery Program, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705, USA
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36
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Abstract
Using neoglycosylation, the impact of differential glycosylation upon the divergent anticancer and anti-HIV properties of the triterpenoid betulinic acid (BA) was examined. Each member from a library of 37 differentially glycosylated BA variants was tested for anticancer and anti-HIV activities. Enhanced analogs for both desired activities were discovered with the corresponding antitumor or antiviral enhancements diverging, on the basis of the appended sugar, into two distinct compound subsets.
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Affiliation(s)
- Randal D. Goff
- University of Wisconsin National Cooperative Drug Discovery Group, Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777, Highland Ave. Madison, WI 53705
| | - Jon S. Thorson
- University of Wisconsin National Cooperative Drug Discovery Group, Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777, Highland Ave. Madison, WI 53705
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37
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Timmons SC, Thorson JS. Increasing carbohydrate diversity via amine oxidation: aminosugar, hydroxyaminosugar, nitrososugar, and nitrosugar biosynthesis in bacteria. Curr Opin Chem Biol 2008; 12:297-305. [PMID: 18424273 PMCID: PMC2517148 DOI: 10.1016/j.cbpa.2008.03.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Revised: 03/19/2008] [Accepted: 03/19/2008] [Indexed: 12/14/2022]
Abstract
Bacterial secondary metabolites often contain carbohydrate attachments that play a significant role in conferring biological activity. A small proportion of these bioactive sugars are derived from aminosugar oxidation to ultimately provide hydroxyaminosugars, nitrososugars, and nitrosugars. Recent advances in the elucidation of hydroxyaminosugar-, nitrososugar-, and nitrosugar-containing natural product gene clusters have enabled the proposal of biosynthetic pathways, the in vitro characterization of aminosugar oxidases, and the structure determination of key enzymes. This article focuses upon the key enzymatic transformations in aminosugar, hydroxyaminosugar, nitrososugar, and nitrosugar biosynthesis, as well as the unique chemical reactivity of alkoxyaminosugars, with a particular focus upon developments within the past two years.
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Affiliation(s)
- Shannon C. Timmons
- Laboratory for Biosynthetic Chemistry, Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705; University of Wisconsin National Cooperative Drug Discovery Group Program
| | - Jon S. Thorson
- Laboratory for Biosynthetic Chemistry, Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705; University of Wisconsin National Cooperative Drug Discovery Group Program
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