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Al-Hilfi A, Walker KD. Biocatalysis of precursors to new-generation SB-T-Taxanes effective against Paclitaxel-Resistant cancer cells. Arch Biochem Biophys 2022; 719:109165. [DOI: 10.1016/j.abb.2022.109165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/21/2022] [Accepted: 02/23/2022] [Indexed: 11/29/2022]
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2
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Zheng LL, Wen G, Yao YX, Li XH, Gao F. Design, Synthesis, and Anticancer Activity of Natural Product Hybrids With Paclitaxel Side Chain Inducing Apoptosis in Human Colon Cancer Cells. Nat Prod Commun 2020. [DOI: 10.1177/1934578x20917298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Based on the strong activity dependence of paclitaxel (PTX; Taxol) or docetaxel (Taxotere) on the C-13 side chain, a small library of dehydroepiandrosterone, cholesterol, vitamin D2, and alkaloids talatisamine and songorine-PTX hybrids have been synthesized and evaluated for in vitro anticancer activity by MTT assay against human breast (MCF-7), colon (HCT116), lung carcinoma (A549), and renal adenocarcinoma (786-0) cancer cell lines. Most hybrids (11b, 12b, 13b, 15b, and 18b) reduced the growth of MCF-7 and 786-0 cells with low PTX sensitivity in vitro. Among the synthesized compounds, hybrid 11b was better in inhibiting the growth of the 4 cells than PTX. A relatively low IC50 value of compound 11b (8.16 ± 0.04 μM) was also examined after exposure for 48 hours. Hybrid 11b showed a proapoptotic effect in HCT116 cells evaluated by Annexin V/propidium iodide binding assay. The level of hybrid 11b leading to protective cell death in HCT116 cells was detected using western blot and not easily observed in our basic examinations.
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Affiliation(s)
- Ling-Li Zheng
- Department of Pharmacy, The First Afflicted Hospital of Chengdu Medical College, PR China,
| | - Guan Wen
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, China
| | - Yun-Xin Yao
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, China
| | - Xiao-Huan Li
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, China
| | - Feng Gao
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, China
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Cianfanelli M, Olivo G, Milan M, Klein Gebbink RJM, Ribas X, Bietti M, Costas M. Enantioselective C–H Lactonization of Unactivated Methylenes Directed by Carboxylic Acids. J Am Chem Soc 2019; 142:1584-1593. [DOI: 10.1021/jacs.9b12239] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Marco Cianfanelli
- QBIS Research Group, Institut de Química Computacional i Catàlisi (IQCC), and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia, Spain
| | - Giorgio Olivo
- QBIS Research Group, Institut de Química Computacional i Catàlisi (IQCC), and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia, Spain
| | - Michela Milan
- QBIS Research Group, Institut de Química Computacional i Catàlisi (IQCC), and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia, Spain
| | - Robertus J. M. Klein Gebbink
- Organic Chemistry & Catalysis, Debye Institute for Nanomaterial Science, Utrecht University, Universiteitsweg 99, 3584CG Utrecht, The Netherlands
| | - Xavi Ribas
- QBIS Research Group, Institut de Química Computacional i Catàlisi (IQCC), and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia, Spain
| | - Massimo Bietti
- Dipartimento di Scienze e Tecnologie Chimiche, Università “Tor Vergata”, Via della Ricerca Scientifica, 1, I-00133 Rome, Italy
| | - Miquel Costas
- QBIS Research Group, Institut de Química Computacional i Catàlisi (IQCC), and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17071, Catalonia, Spain
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Pandey S, Thakur A, Reshma, Bari SS, Thapar R. A Facile and Stereoselective Synthesis of 3‐Phenylsulfinyl‐β‐lactams Using Selectfluor. ChemistrySelect 2019. [DOI: 10.1002/slct.201904114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Suvidha Pandey
- Department of ChemistryPanjab University, Chandigarh India
| | - Aarti Thakur
- University Institute of Engineering and TechnologyPanjab University, Chandigarh India
| | - Reshma
- DAV College, Sector 10, Chandigarh India
| | | | - Renu Thapar
- University Institute of Engineering and TechnologyPanjab University, Chandigarh India
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Recent advances in design, synthesis and bioactivity of paclitaxel-mimics. Fitoterapia 2016; 110:26-37. [DOI: 10.1016/j.fitote.2016.02.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 02/17/2016] [Accepted: 02/18/2016] [Indexed: 11/18/2022]
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Han F, Kang LZ, Zeng XL, Ye ZW, Guo LQ, Lin JF. Bioproduction of baccatin III, an advanced precursor of paclitaxol, with transgenic Flammulina velutipes expressing the 10-deacetylbaccatin III-10-O-acetyl transferase gene. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2014; 94:2376-2383. [PMID: 24403190 DOI: 10.1002/jsfa.6562] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 11/06/2013] [Accepted: 01/08/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND 10-Deacetylbaccatin III (10-DAB) and baccatin III are intermediates in the biosynthesis of Taxol (an anti-cancer drug) and useful precursors for semi-synthesis of the drug. In this study, a bioconversion system was established for the production of baccatin III, an advanced precursor of paclitaxel, in the transgenic mushroom Flammulina velutipes expressing the 10-deacetylbaccatin III-10β-O-acetyltransferase gene. The expression vector pgFvs-TcDBAT containing the 10-deacetylbaccatin III-10β-O-acetyltransferase (DBAT) gene was constructed and transformed into the cells of F. velutipes by polyethylene glycol-mediated protoplast transformation. RESULTS Polymerase chain reaction and Southern blotting analysis verified the successful integration of the exogenous DBAT gene into the genome of F. velutipes. Reverse transcription polymerase chain reaction and enzyme activity analyses confirmed that the DBAT gene was expressed in F. velutipes, and DBAT is able to convert substrate into baccatin III. CONCLUSION The DBAT gene from the plant Taxus chinensis can be functionally expressed in F. velutipes. Transgenic F. velutipes expressing the DBAT gene is able to produce the target product, baccatin III. This is the first report about the transformation and expression of paclitaxel biosynthetic gene in the edible mushroom F. velutipes. This represents a significant step towards bio-production of paclitaxel and its advanced precursor baccatin III in an edible fungus.
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Affiliation(s)
- Fei Han
- Department of Bioengineering, College of Food Science, South China Agriculture University, Guangzhou, Guangdong, 510640, China; Guangdong Shantou Institute of Quality and Metrology Supervision Testing, Shantou, 515041, China
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Kingston DGI, Snyder JP. The quest for a simple bioactive analog of paclitaxel as a potential anticancer agent. Acc Chem Res 2014; 47:2682-91. [PMID: 25052294 PMCID: PMC4139185 DOI: 10.1021/ar500203h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Paclitaxel (PTX), introduced into the clinic in 1991, has revealed itself as an effective antimicrotubule drug for treatment of a range of otherwise intractable cancers. Along with docetaxel (DTX) and in combination with other agents such as cisplatin, it has proven to be a first-line therapy. Unfortunately, PTX and DTX carry severe liabilities such as debilitating side effects, rapid onset of resistance, and rather complex molecular structures offering substantial challenges to ease of synthetic manipulation. Consequently, the past 15 years has witnessed many efforts to synthesize and test highly modified analogs based on intuitive structural similarity relationships with the PTX molecular skeleton, as well as efforts to mimic the conformational profile of the ligand observed in the macromolecular tubulin-PTX complex. Highly successful improvements in potency, up to 50-fold increases in IC50, have been achieved by constructing bridges between distal centers in PTX that imitate the conformer of the electron crystallographic binding pose. Much less successful have been numerous attempts to truncate PTX by replacing the baccatin core with simpler moieties to achieve PTX-like potencies and applying a wide range of flexible synthesis-based chemistries. Reported efforts, characterized by a fascinating array of baccatin substitutes, have failed to surpass the bioactivities of PTX in both microtubule disassembly assays and cytotoxicity measurements against a range of cell types. Most of the structures retain the main elements of the PTX C13 side chain, while seeking a smaller rigid bicycle as a baccatin replacement adorned with substituents to mimic the C2 benzoyl moiety and the oxetane ring. We surmise that past studies have been handicapped by solubility and membrane permeability issues, but primarily by the existence of an expansive taxane binding pocket and the discrepancy in molecular size between PTX and the pruned analogs. A number of these molecules offer molecular volumes 50-60% that of PTX, fewer contacts with the tubulin protein, severe mismatches with the PTX pharmacophore, lessened capacity to dispel binding site waters contributing to ΔGbind, and unanticipated binding poses. The latter is a critical drawback if molecular designs of simpler PTX structures are based on a perceived or known PTX binding conformation. We conclude that design and synthesis of a highly cytotoxic tubulin-assembly agent based on the paclitaxel pharmacophore remains an unsolved challenge, but one that can be overcome by focus on the architecture of the taxane binding site independent of the effective, but not unique, hand-in-glove match represented by the PTX-tubulin complex.
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Affiliation(s)
- David G. I. Kingston
- Department
of Chemistry and Virginia Tech Center for Drug Discovery, Virginia Tech, Blacksburg, Virginia, 24061 United States
| | - James P. Snyder
- Department
of Chemistry, Emory University, Atlanta, Georgia, 30322 United States
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Chen XX, Gao F, Wang Q, Huang X, Wang D. Design, synthesis and biological evaluation of paclitaxel-mimics possessing only the oxetane D-ring and side chain structures. Fitoterapia 2014; 92:111-5. [DOI: 10.1016/j.fitote.2013.10.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 10/27/2013] [Accepted: 10/29/2013] [Indexed: 11/29/2022]
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9
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Zefirova ON, Zefirov NS. Targeted application of bridged fragments in the design of physiologically active compounds. Russ Chem Bull 2013. [DOI: 10.1007/s11172-013-0044-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kingston DGI, Tamarkin L, Paciotti GF. Conformationally Constrained and Nanoparticle Targeted Paclitaxels. PURE APPL CHEM 2012; 84:1455-1467. [PMID: 25598555 PMCID: PMC4295212 DOI: 10.1351/pac-con-11-09-02] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Paclitaxel (Taxol®) is one of the most important anticancer agents developed over the last 30 years. Its primary mechanism of action is by interaction with the cellular protein tubulin, causing irreversible polymerization to microtubules. A detailed knowledge of this crucial interaction is thus of paramount importance in the design and development of highly potent analogs and also for the potential development of "non-taxane" tubulin polymerization agents. This review briefly describes the discovery and development of taxol, and then describes our work on delineating the tubulin-binding conformation of paclitaxel by a combination of REDOR NMR and molecular modeling. The resulting "T-taxol" conformation was validated by the synthesis of conformationally constrained paclitaxel analogs, which had bioactivities up to twenty-fold higher than those of paclitaxel. The review concludes with recent work on the development of a gold nanoparticle derivative of paclitaxel. This delivery method has the potential to lower the dosage of paclitaxel needed while maintaining or increasing its effectiveness, thus significantly improving the benefits of this important chemotherapeutic agent.
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Affiliation(s)
| | - Lawrence Tamarkin
- CytImmune Sciences, Inc. 105010 Broschart Rd, Rockville, MD 20850, USA
| | - Giulio F Paciotti
- CytImmune Sciences, Inc. 105010 Broschart Rd, Rockville, MD 20850, USA
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Zhao J, Bane S, Snyder JP, Hu H, Mukherjee K, Slebodnick C, Kingston DGI. Design and synthesis of simplified taxol analogs based on the T-Taxol bioactive conformation. Bioorg Med Chem 2011; 19:7664-78. [PMID: 22071526 PMCID: PMC3225578 DOI: 10.1016/j.bmc.2011.10.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 09/30/2011] [Accepted: 10/05/2011] [Indexed: 10/16/2022]
Abstract
A series of compounds designed to adopt a conformation similar to the tubulin-binding T-Taxol conformation of the anticancer drug paclitaxel has been synthesized. Both the internally bridged analogs 37-39, 41 and the open-chain analogs 27-29 and 43 were prepared. The bridged analogs 37-39 and 41 were synthesized by Grubbs' metatheses of compounds 30-32 and 33, which, in turn, were prepared by coupling β-lactams 24-26 with alcohols 22 and 23. Both the bridged and the open-chain analogs showed moderate to good cytotoxicity.
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Affiliation(s)
- Jielu Zhao
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Susan Bane
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902
| | - James P. Snyder
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322
| | - Haipeng Hu
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322
| | - Kamalika Mukherjee
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902
| | - Carla Slebodnick
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, USA
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Zarei M, Mohamadzadeh M. 3-Thiolated 2-azetidinones: synthesis and in vitro antibacterial and antifungal activities. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.043] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Jarrahpour A, Fadavi A, Zarei M. Synthesis of Structurally Diverse 2-Azetidinones via Staudinger Reaction on a Solid Support. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2011. [DOI: 10.1246/bcsj.20100212] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Manach CL, Baron A, Guillot R, Vauzeilles B, Beau JM. Design and synthesis by click triazole formation of paclitaxel mimics with simplified core and side-chain structures. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.01.081] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Design and synthesis of de novo cytotoxic alkaloids by mimicking the bioactive conformation of paclitaxel. Bioorg Med Chem 2010; 18:7101-12. [PMID: 20800500 DOI: 10.1016/j.bmc.2010.07.069] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Revised: 07/27/2010] [Accepted: 07/30/2010] [Indexed: 11/20/2022]
Abstract
Novel paclitaxel-mimicking alkaloids were designed and synthesized based on a bioactive conformation of paclitaxel, that is, REDOR-Taxol. The alkaloid 2 bearing a 5-7-6 tricyclic scaffold mimics REDOR-Taxol best among the compounds designed and was found to be the most potent compound against several drug-sensitive and drug-resistant human cancer cell lines. MD simulation study on the paclitaxel mimics 1 and 2 as well as REDOR-Taxol bound to the 1JFF tubulin structure was quite informative to evaluate the level of mimicking. The MD simulation study clearly distinguishes the 5-6-6 and 5-7-6 tricyclic scaffolds, and also shows substantial difference in the conformational stability of the tubulin-bound structures between 2 and REDOR-Taxol. The latter may account for the large difference in potency, and provides critical information for possible improvement in the future design of paclitaxel mimics.
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Jarrahpour A, Zarei M. Efficient one-pot synthesis of 2-azetidinones from acetic acid derivatives and imines using methoxymethylene-N,N-dimethyliminium salt. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Sun L, Simmerling C, Ojima I. Recent advances in the study of the bioactive conformation of taxol. ChemMedChem 2009; 4:719-31. [PMID: 19360801 DOI: 10.1002/cmdc.200900044] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Paclitaxel is one of the most important chemotherapeutic drugs in the fight against cancer. This minireview covers the recent advances in the study of the bioactive conformation of paclitaxel in tubulin/microtubules. The tubulin-bound structure of paclitaxel has been studied by means of photoaffinity labeling, cryo-electron microscopy, solid-state NMR, molecular modeling, MD simulations and the synthesis of conformationally restrained analogues and paclitaxel mimics. The bioactive conformation of paclitaxel is important since it could provide critical information that would allow the design of novel analogues with simpler structures and/or increased potency against cancer.
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Affiliation(s)
- Liang Sun
- Department of Chemistry and Institute of Chemical Biology & Drug Discovery, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA
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Nevarez DM, Mengistu YA, Nawarathne IN, Walker KD. An N-aroyltransferase of the BAHD superfamily has broad aroyl CoA specificity in vitro with analogues of N-dearoylpaclitaxel. J Am Chem Soc 2009; 131:5994-6002. [PMID: 19382815 DOI: 10.1021/ja900545m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The native N-debenzoyl-2'-deoxypaclitaxel:N-benzoyltransferase (NDTBT), from Taxus plants, transfers a benzoyl group from the corresponding CoA thioester to the amino group of the beta-phenylalanine side chain of N-debenzoyl-2'-deoxypaclitaxel, which is purportedly on the paclitaxel (Taxol) biosynthetic pathway. To elucidate the substrate specificity of NDTBT overexpressed in Escherichia coli, the purified enzyme was incubated with semisynthetically derived N-debenzoyltaxoid substrates and aroyl CoA donors (benzoyl; ortho-, meta-, and para-substituted benzoyls; various heterole carbonyls; alkanoyls; and butenoyl), which were obtained from commercial sources or synthesized via a mixed anhydride method. Several unnatural N-aroyl-N-debenzoyl-2'-deoxypaclitaxel analogues were biocatalytically assembled with catalytic efficiencies (V(max)/K(M)) ranging between 0.15 and 1.74 nmol.min(-1).mM(-1). In addition, several N-acyl-N-debenzoylpaclitaxel variants were biosynthesized when N-debenzoylpaclitaxel and N-de(tert-butoxycarbonyl)docetaxel (i.e., 10-deacetyl-N-debenzoylpaclitaxel) were used as substrates. The relative velocity (v(rel)) for NDTBT with the latter two N-debenzoyl taxane substrates ranged between approximately 1% and 200% for the array of aroyl CoAs compared to benzoyl CoA. Interestingly, NDTBT transferred hexanoyl, acetyl, and butyryl more rapidly than butenoyl or benzoyl from the CoA donor to taxanes with isoserinoyl side chains, whereas N-debenzoyl-2'-deoxypaclitaxel was more rapidly converted to its N-benzoyl derivative than to its N-alkanoyl or N-butenoyl congeners. Biocatalytic N-acyl transfer of novel acyl groups to the amino functional group of N-debenzoylpaclitaxel and its 2'-deoxy precursor reveal the surprisingly indiscriminate specificity of this transferase. This feature of NDTBT potentially provides a tool for alternative biocatalytic N-aroylation/alkanoylation to construct next generation taxanes or other novel bioactive diterpene compounds.
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Affiliation(s)
- Danielle M Nevarez
- Cell and Molecular Biology Program, Michigan State University, East Lansing, Michigan 48824, USA
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Zefirova ON, Nurieva EV, Lemcke H, Ivanov AA, Shishov DV, Weiss DG, Kuznetsov SA, Zefirov NS. Design, synthesis, and bioactivity of putative tubulin ligands with adamantane core. Bioorg Med Chem Lett 2008; 18:5091-4. [DOI: 10.1016/j.bmcl.2008.07.116] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 07/30/2008] [Accepted: 07/31/2008] [Indexed: 10/21/2022]
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Fang WS, Wang SR. Structural studies of taxol analogues for drug discovery. Expert Opin Drug Discov 2008; 3:1109-22. [DOI: 10.1517/17460441.3.9.1109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Zefirova ON, Nurieva EV, Lemcke H, Ivanov AA, Zyk NV, Weiss DG, Kuznetsov SA, Zefirov NS. Design, synthesis and bioactivity of simplified taxol analogues on the basis of bicyclo[3.3.1]nonane derivatives. MENDELEEV COMMUNICATIONS 2008. [DOI: 10.1016/j.mencom.2008.07.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
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Recent research on the chemistry of natural products from the author’s group that led to the receipt of the ACS Ernest Guenther Award in the Chemistry of Natural Products is reviewed. REDOR NMR and synthetic studies established the T-taxol conformation as the bioactive tubulin-binding conformation, and these results were confirmed by the synthesis of compounds which clearly owed their activity or lack of activity to whether or not they could adopt the T-taxol conformation. Similar studies with the epothilones suggest that the current tubulin-binding model needs to be modified. Examples of natural products discovery and biodiversity conservation in Suriname and Madagascar are also presented, and it is concluded that natural products chemistry will continue to make significant contributions to drug discovery.
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Affiliation(s)
- David G I Kingston
- Department of Chemistry, M/C 0212, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA.
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Zefirova ON, Nurieva EV, Nuriev VN, Potekhin KA, Maleev AV, Zyk NV, Zefirov NS. Crystal structure of the tritylated product of 3-hydroxymethylbicyclo[3.3.1]nonan-2-on-7-ol ethylene acetal cyclization. MENDELEEV COMMUNICATIONS 2007. [DOI: 10.1016/j.mencom.2007.11.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pastorino L, Caneva Soumetz F, Giacomini M, Ruggiero C. Development of a piezoelectric immunosensor for the measurement of paclitaxel. J Immunol Methods 2006; 313:191-8. [PMID: 16774765 DOI: 10.1016/j.jim.2006.05.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2006] [Revised: 04/26/2006] [Accepted: 05/10/2006] [Indexed: 11/24/2022]
Abstract
This paper describes the development of a piezoelectric immunosensor for the measurement of paclitaxel (taxol), a natural anti-cancer agent. An antibody specific for taxanes was immobilized onto the surface of quartz crystals by means of the layer-by-layer self-assembly technique. The immobilization was achieved using electrostatic interactions between a precursor layer and the antibody molecules. The assembly process was monitored by a quartz crystal microbalance (QCM) and the topography of the modified quartz crystals was investigated by means of atomic force microscopy. The specific interaction of the immobilized antibody with paclitaxel in solution at different concentrations was monitored as a change in resonant frequency of the modified crystal. Moreover, the influence of non-specific adsorption was also characterized. The results show that the proposed immunosensor offers a promising alternative to classical analytical methods for a fast and easy determination of paclitaxel.
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Affiliation(s)
- L Pastorino
- Department of Communication, Computer and System Sciences, University of Genoa, Via Opera Pia, 13-16145 Genova, Italy
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