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Skrzypczak N, Przybylski P. Structural diversity and biological relevance of benzenoid and atypical ansamycins and their congeners. Nat Prod Rep 2022; 39:1678-1704. [PMID: 35262153 DOI: 10.1039/d2np00004k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Covering: 2011 to 2021The structural division of ansamycins, including those of atypical cores and different lengths of the ansa chains, is presented. Recently discovered benzenoid and atypical ansamycin scaffolds are presented in relation to their natural source and biosynthetic routes realized in bacteria as well as their muta and semisynthetic modifications influencing biological properties. To better understand the structure-activity relationships among benzenoid ansamycins structural aspects together with mechanisms of action regarding different targets in cells, are discussed. The most promising directions for structural optimizations of benzenoid ansamycins, characterized by predominant anticancer properties, were discussed in view of their potential medical and pharmaceutical applications. The bibliography of the review covers mainly years from 2011 to 2021.
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Affiliation(s)
- Natalia Skrzypczak
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland.
| | - Piotr Przybylski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland.
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2
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Han X, Nie X, Feng Y, Wei B, Si C, Lin G. Intermolecular [4 + 2] process of N-acyliminium ions with simple olefins for construction of functional substituted-1,3-oxazinan-2-ones. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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3
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Kudo F, Takahashi S, Miyanaga A, Nakazawa Y, Nishino K, Hayakawa Y, Kawamura K, Ishikawa F, Tanabe G, Iwai N, Nagumo Y, Usui T, Eguchi T. Mutational Biosynthesis of Hitachimycin Analogs Controlled by the β-Amino Acid-Selective Adenylation Enzyme HitB. ACS Chem Biol 2021; 16:539-547. [PMID: 33625847 DOI: 10.1021/acschembio.1c00003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hitachimycin is a macrolactam antibiotic with an (S)-β-phenylalanine (β-Phe) at the starter position of its polyketide skeleton. (S)-β-Phe is formed from l-α-phenylalanine by the phenylananine-2,3-aminomutase HitA in the hitachimycin biosynthetic pathway. In this study, we produced new hitachimycin analogs via mutasynthesis by feeding various (S)-β-Phe analogs to a ΔhitA strain. We obtained six hitachimycin analogs with F at the ortho, meta, or para position and Cl, Br, or a CH3 group at the meta position of the phenyl moiety, as well as two hitachimycin analogs with thienyl substitutions. Furthermore, we carried out a biochemical and structural analysis of HitB, a β-amino acid-selective adenylation enzyme that introduces (S)-β-Phe into the hitachimycin biosynthetic pathway. The KM values of the incorporated (S)-β-Phe analogs and natural (S)-β-Phe were similar. However, the KM values of unincorporated (S)-β-Phe analogs with Br and a CH3 group at the ortho or para position of the phenyl moiety were high, indicating that HitB functions as a gatekeeper to select macrolactam starter units during mutasynthesis. The crystal structure of HitB in complex with (S)-β-3-Br-phenylalanine sulfamoyladenosine (β-m-Br-Phe-SA) revealed that the bulky meta-Br group is accommodated by the conformational flexibility around Phe328, whose side chain is close to the meta position. The aromatic group of β-m-Br-Phe-SA is surrounded by hydrophobic and aromatic residues, which appears to confer the conformational flexibility that enables HitB to accommodate the meta-substituted (S)-β-Phe. The new hitachimycin analogs exhibited different levels of biological activity in HeLa cells and multidrug-sensitive budding yeast, suggesting that they may target different molecules.
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Affiliation(s)
- Fumitaka Kudo
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Sotaro Takahashi
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Akimasa Miyanaga
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Yuichiro Nakazawa
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Kota Nishino
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Yuki Hayakawa
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Koichi Kawamura
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
| | - Fumihiro Ishikawa
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Naeko Iwai
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Ibaraki, Japan
| | - Yoko Nagumo
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Ibaraki, Japan
| | - Takeo Usui
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Ibaraki, Japan
| | - Tadashi Eguchi
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Meguro-ku, O-okayama, Tokyo 152-8551, Japan
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Han XL, Nie XD, Chen ZD, Si CM, Wei BG, Lin GQ. Synthesis of a 3,4-Dihydro-1,3-oxazin-2-ones Skeleton via an Intermolecular [4 + 2] Process of N-Acyliminium Ions with Ynamides/Terminal Alkynes. J Org Chem 2020; 85:13567-13578. [DOI: 10.1021/acs.joc.0c01692] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Xiao-Li Han
- Institutes of Biomedical Sciences and School of Pharmacy, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Xiao-Di Nie
- Institutes of Biomedical Sciences and School of Pharmacy, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Zhao-Dan Chen
- Institutes of Biomedical Sciences and School of Pharmacy, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Chang-Mei Si
- Institutes of Biomedical Sciences and School of Pharmacy, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Bang-Guo Wei
- Institutes of Biomedical Sciences and School of Pharmacy, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Guo-Qiang Lin
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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Klahn P, Fetz V, Ritter A, Collisi W, Hinkelmann B, Arnold T, Tegge W, Rox K, Hüttel S, Mohr KI, Wink J, Stadler M, Wissing J, Jänsch L, Brönstrup M. The nuclear export inhibitor aminoratjadone is a potent effector in extracellular-targeted drug conjugates. Chem Sci 2019; 10:5197-5210. [PMID: 31191875 PMCID: PMC6540907 DOI: 10.1039/c8sc05542d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 04/15/2019] [Indexed: 12/04/2022] Open
Abstract
The concept of targeted drug conjugates has been successfully translated to clinical practice in oncology. Whereas the majority of cytotoxic effectors in drug conjugates are directed against either DNA or tubulin, our study aimed to validate nuclear export inhibition as a novel effector principle in drug conjugates. For this purpose, a semisynthetic route starting from the natural product ratjadone A, a potent nuclear export inhibitor, has been developed. The biological evaluation of ratjadones functionalized at the 16-position revealed that oxo- and amino-analogues had very high potencies against cancer cell lines (e.g. 16R-aminoratjadone 16 with IC50 = 260 pM against MCF-7 cells, or 19-oxoratjadone 14 with IC50 = 100 pM against A-549 cells). Mechanistically, the conjugates retained a nuclear export inhibitory activity through binding CRM1. To demonstrate a proof-of-principle for cellular targeting, folate- and luteinizing hormone releasing hormone (LHRH)-based carrier molecules were synthesized and coupled to aminoratjadones as well as fluorescein for cellular efficacy and imaging studies, respectively. The Trojan-Horse conjugates selectively addressed receptor-positive cell lines and were highly potent inhibitors of their proliferation. For example, the folate conjugate FA-7-Val-Cit-pABA-16R-aminoratjadone had an IC50 of 34.3 nM, and the LHRH conjugate d-Orn-Gose-Val-Cit-pABA-16R-aminoratjadone had an IC50 of 12.8 nM. The results demonstrate that nuclear export inhibition is a promising mode-of-action for extracellular-targeted drug conjugate payloads.
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Affiliation(s)
- Philipp Klahn
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
- Institute of Organic Chemistry , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Verena Fetz
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
| | - Antje Ritter
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
| | - Wera Collisi
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
- Department of Microbial Drugs , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Bettina Hinkelmann
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
| | - Tatjana Arnold
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
| | - Werner Tegge
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
| | - Katharina Rox
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
- German Centre of Infection Research (DZIF) , Partner Site Hannover-Braunschweig , Germany
| | - Stephan Hüttel
- Department of Microbial Drugs , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Kathrin I Mohr
- Department of Microbial Drugs , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Joachim Wink
- Department of Microbial Drugs , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Marc Stadler
- Department of Microbial Drugs , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Josef Wissing
- Department of Structure and Function of Proteins , Research Group Cellular Proteomic , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Lothar Jänsch
- Department of Structure and Function of Proteins , Research Group Cellular Proteomic , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany
| | - Mark Brönstrup
- Department of Chemical Biology , Helmholtz Centre for Infection Research , Inhoffenstrasse 7 , 38124 Braunschweig , Germany .
- Biomolecular Drug Research Center (BMWZ) , Schneiderberg 38 , 30167 Hannover , Germany
- German Centre of Infection Research (DZIF) , Partner Site Hannover-Braunschweig , Germany
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6
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Gallo RDC, Campovilla Jr. OC, Ahmad A, Burtoloso ACB. Synthesis of Oxazinanones: Intramolecular Cyclization of Amino Acid-Derived Diazoketones via Silica-Supported HClO4 Catalysis. Front Chem 2019; 7:62. [PMID: 30800653 PMCID: PMC6376066 DOI: 10.3389/fchem.2019.00062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 01/22/2019] [Indexed: 11/18/2022] Open
Abstract
A Brønsted acid catalyzed intramolecular cyclization of N-Cbz-protected diazoketones, derived from α-amino acids, is described. The reaction proceeds under metal-free conditions and is promoted by ecofriendly silica-supported HClO4 as the catalyst and methanol as the solvent. This transformation enables the short synthesis of various 1,3-oxazinane-2,5-diones under mild reaction conditions and in good yields (up to 90%). The set-up is very simple; by just mixing all reagents together with no work-up necessary before purification, this protocol takes a greener approach.
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Yang R, Yang J, Wang L, Huang JP, Xiong Z, Luo J, Yu M, Yan Y, Huang SX. Lorneic Acid Analogues from an Endophytic Actinomycete. JOURNAL OF NATURAL PRODUCTS 2017; 80:2615-2619. [PMID: 28990780 DOI: 10.1021/acs.jnatprod.7b00056] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Our natural products discovery program utilizes endophytic actinomycetes associated with plants and employs biological assays and HPLC-based metabolite profiles as the preliminary screen to identify strains of interest, followed by large-scale fermentation and isolation, leading to new and/or bioactive natural products. Six new trialkyl-substituted aromatic acids, namely, lorneic acids E-J (1-6), together with two known analogues (7 and 8), were isolated and identified from the culture extract of Streptomyces sp. KIB-H1289, an endophytic actinomycete obtained from the inner tissue of the bark of Betula mandshurica Nakai. The structures were characterized by interpretation of their spectroscopic data, mainly 1D and 2D NMR. Among them, compound 5 contains a unique disulfide bond that is presumably derived from N-acetylcysteine. All isolated metabolites were evaluated for their inhibitory activity on tyrosinase.
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Affiliation(s)
- Ruimin Yang
- University of the Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | | | - Li Wang
- University of the Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | | | - Zijun Xiong
- University of the Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | | | - Mingming Yu
- University of the Chinese Academy of Sciences , Beijing 100049, People's Republic of China
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8
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Wang LL, Balakrishnan A, Bigall NC, Candito D, Miethe JF, Seidel K, Xie Y, Ott M, Kirschning A. A Bio-Chemosynthetic Approach to Superparamagnetic Iron Oxide-Ansamitocin Conjugates for Use in Magnetic Drug Targeting. Chemistry 2017; 23:2265-2270. [PMID: 27935144 DOI: 10.1002/chem.201604903] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Indexed: 12/20/2022]
Abstract
A combination of mutasynthesis using a mutant strain of A. pretiosum blocked in the biosynthesis of amino-hydroxybenzoic acid (AHBA) and semisynthesis relying on a Stille cross-coupling step provided access to new ansamitocin derivatives of which one was attached by a thermolabile linker to nanostructured iron oxide particles. When exposed to an oscillating electromagnetic field the resulting iron oxide/ansamitocin conjugate 19 heats up in an aqueous suspension and the ansamitocin derivative 16 is released by means of a retro-Diels-Alder reaction. It exerts strong antiproliferative activity (IC50 =4.8 ng mg-1 ) in mouse fibroblasts. These new types of conjugates have the potential for combating cancer through hyperthermia and chemotherapy using an electromagnetic external trigger.
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Affiliation(s)
- Liang-Liang Wang
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Asha Balakrishnan
- Department of Gastroenterology, Hepatology, and Endocrinology, Hannover Medical School (MHH), TWINCORE, Center for Experimental and Clinical Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany
| | - Nadja-Carola Bigall
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3A, 30167, Hannover, Germany
| | - David Candito
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Jan Frederick Miethe
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3A, 30167, Hannover, Germany
| | - Katja Seidel
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Yu Xie
- Department of Gastroenterology, Hepatology, and Endocrinology, Hannover Medical School (MHH), TWINCORE, Center for Experimental and Clinical Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany
| | - Michael Ott
- Department of Gastroenterology, Hepatology, and Endocrinology, Hannover Medical School (MHH), TWINCORE, Center for Experimental and Clinical Infection Research, Feodor-Lynen-Str. 7, 30625, Hannover, Germany
| | - Andreas Kirschning
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
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11
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Mancuso L, Knobloch T, Buchholz J, Hartwig J, Möller L, Seidel K, Collisi W, Sasse F, Kirschning A. Preparation of Thermocleavable Conjugates Based on Ansamitocin and Superparamagnetic Nanostructured Particles by a Chemobiosynthetic Approach. Chemistry 2014; 20:17541-51. [DOI: 10.1002/chem.201404502] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Indexed: 11/08/2022]
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12
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Buyck T, Wang Q, Zhu J. Triple role of phenylselenonyl group enabled a one-pot synthesis of 1,3-oxazinan-2-ones from α-isocyanoacetates, phenyl vinyl selenones, and water. J Am Chem Soc 2014; 136:11524-8. [PMID: 25066833 DOI: 10.1021/ja506031h] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Reaction of α-substituted α-isocyanoacetates with phenyl vinyl selenones in the presence of a catalytic amount of base (DBU or Et3N, 0.05-0.1 equiv) followed by addition of p-toluenesulfonic acid (PTSA, 0.1-0.2 equiv) afforded 4,4,5-trisubstituted 1,3-oxazinan-2-ones in good to excellent yields. Enantiomerically enriched heterocycles can also be prepared using a Cinchona alkaloid-derived bifunctional organocatalyst for the Michael addition step. The phenylselenonyl group served as an activator for the Michael addition, a leaving group and a latent oxidant in this integrated reaction sequence.
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Affiliation(s)
- Thomas Buyck
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne , EPFL-SB-ISIC-LSPN, BCH 5304, 1015 Lausanne, Switzerland
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Affiliation(s)
- Gerrit Jürjens
- Institute of Organic Chemistry
and Center of Biomolecuclar Drug Research (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Andreas Kirschning
- Institute of Organic Chemistry
and Center of Biomolecuclar Drug Research (BMWZ), Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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14
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Alcaide B, Almendros P. Gold-catalyzed cyclization reactions of allenol and alkynol derivatives. Acc Chem Res 2014; 47:939-52. [PMID: 24428670 DOI: 10.1021/ar4002558] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Although gold is chemically inert as a bulk metal, the landmark discovery that gold nanoparticles can be effective catalysts has opened up new and exciting research opportunities in the field. In recent years, there has been growth in the number of reactions catalyzed by gold complexes [gold(I) and gold(III)], usually as homogeneous catalysts, because they are soft Lewis acids. In addition, alkynes and allenes have interesting reactivities and selectivities, notably their ability to produce complex structures in very few steps. In this Account, we describe our work in gold catalysis with a focus on the formation of C-C and C-O bonds using allenes and alkynes as starting materials. Of these, oxa- and carbo-cyclizations are perhaps the best known and most frequently studied. We have divided those contributions into sections arranged according to the nature of the starting material (allene versus alkyne). Gold-catalyzed carbocyclizations in allenyl C2-linked indoles, allenyl-β-lactams, and allenyl sugars follow different mechanistic pathways. The cyclization of indole-tethered allenols results in the efficient synthesis of carbazole derivatives, for example. However, the compound produced from gold-catalyzed 9-endo carbocyclization of (aryloxy)allenyl-tethered 2-azetidinones is in noticeable contrast to the 5-exo hydroalkylation product that results from allenyl sugars. We have illustrated the unusual preference for the 4-exo-dig cyclization in allene chemistry, as well as the rare β-hydride elimination reaction, in gold catalysis from readily available α-allenols. We have also observed in γ-allenols that a (methoxymethyl)oxy protecting group not only masks a hydroxyl functionality but also exerts directing effects as a controlling unit in a gold-catalyzed regioselectivity reversal. Our recent work has also led to a combined experimental and computational study on regioselective gold-catalyzed synthetic routes to 1,3-oxazinan-2-ones (kinetically controlled products) and 1,3-oxazin-2-one derivatives (thermodynamically favored) from easily accessible allenic carbamates. In addition, we discuss the direct gold-catalyzed cycloketalization of alkynyldioxolanes, as well as aminoketalization of alkynyloxazolidines. We performed labeling studies and density functional calculations to gain insight into the mechanisms of the bis-heterocyclization reactions. We also describe the controlled gold-catalyzed reactions of primary and secondary propargylic hydroperoxides with a variety of nucleophiles including alcohols and phenols, allowing the direct synthesis of β-functionalized ketones. Through computations and (18)O-labeling experiments, we discovered various aspects of the controlled reactivity of propargylic hydroperoxides with external nucleophiles under gold catalysis. The mechanism resembles a Meyer-Schuster rearrangement, but notably, the presence and geometry characteristics of the OOH functional group allow a new pathway to happen, which cannot apply to propargylic alcohols.
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Affiliation(s)
- Benito Alcaide
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Pedro Almendros
- Instituto de Química Orgánica General, IQOG-CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
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15
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Harmrolfs K, Mancuso L, Drung B, Sasse F, Kirschning A. Preparation of new alkyne-modified ansamitocins by mutasynthesis. Beilstein J Org Chem 2014; 10:535-43. [PMID: 24605171 PMCID: PMC3943755 DOI: 10.3762/bjoc.10.49] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Accepted: 01/29/2014] [Indexed: 11/23/2022] Open
Abstract
The preparation of alkyne-modified ansamitocins by mutasynthetic supplementation of Actinosynnema pretiosum mutants with alkyne-substituted aminobenzoic acids is described. This modification paved the way to introduce a thiol linker by Huisgen-type cycloaddition which can principally be utilized to create tumor targeting conjugates. In bioactivity tests, only those new ansamitocin derivatives showed strong antiproliferative activity that bear an ester side chain at C-3.
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Affiliation(s)
- Kirsten Harmrolfs
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ), Leibniz University Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Lena Mancuso
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ), Leibniz University Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Binia Drung
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ), Leibniz University Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Florenz Sasse
- Department of Chemical Biology, Helmholtz Center for Infectious Research (HZI), Inhoffenstraße 7, D-38124 Braunschweig, Germany
| | - Andreas Kirschning
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ), Leibniz University Hannover, Schneiderberg 1b, 30167 Hannover, Germany
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16
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Ueberschaar N, Xu Z, Scherlach K, Metsä-Ketelä M, Bretschneider T, Dahse HM, Görls H, Hertweck C. Synthetic Remodeling of the Chartreusin Pathway to Tune Antiproliferative and Antibacterial Activities. J Am Chem Soc 2013; 135:17408-16. [DOI: 10.1021/ja4080024] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
| | | | | | - Mikko Metsä-Ketelä
- Department
of Biochemistry and Food Chemistry, University of Turku, 20014 Turku, Finland
| | | | | | - Helmar Görls
- Friedrich Schiller University, Institute for Inorganic
and Analytical Chemistry, 07743 Jena, Germany
| | - Christian Hertweck
- Friedrich Schiller University, Chair for Natural Product
Chemistry 07743 Jena, Germany
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17
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Venghateri JB, Gupta TK, Verma PJ, Kunwar A, Panda D. Ansamitocin P3 depolymerizes microtubules and induces apoptosis by binding to tubulin at the vinblastine site. PLoS One 2013; 8:e75182. [PMID: 24124473 PMCID: PMC3790769 DOI: 10.1371/journal.pone.0075182] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 08/11/2013] [Indexed: 11/18/2022] Open
Abstract
Maytansinoid conjugates are currently under different phases of clinical trials and have been showing promising activity for various types of cancers. In this study, we have elucidated the mechanism of action of ansamitocin P3, a structural analogue of maytansine for its anticancer activity. Ansamitocin P3 potently inhibited the proliferation of MCF-7, HeLa, EMT-6/AR1 and MDA-MB-231 cells in culture with a half-maximal inhibitory concentration of 20±3, 50±0.5, 140±17, and 150±1.1 pM, respectively. Ansamitocin P3 strongly depolymerized both interphase and mitotic microtubules and perturbed chromosome segregation at its proliferation inhibitory concentration range. Treatment of ansamitocin P3 activated spindle checkpoint surveillance proteins, Mad2 and BubR1 and blocked the cells in mitotic phase of the cell cycle. Subsequently, cells underwent apoptosis via p53 mediated apoptotic pathway. Further, ansamitocin P3 was found to bind to purified tubulin in vitro with a dissociation constant (Kd) of 1.3±0.7 µM. The binding of ansamitocin P3 induced conformational changes in tubulin. A docking analysis suggested that ansamitocin P3 may bind partially to vinblastine binding site on tubulin in two different positions. The analysis indicated that the binding of ansamitocin P3 to tubulin is stabilized by hydrogen bonds. In addition, weak interactions such as halogen-oxygen interactions may also contribute to the binding of ansamitocin P3 to tubulin. The study provided a significant insight in understanding the antiproliferative mechanism of action of ansamitocin P3.
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Affiliation(s)
- Jubina B. Venghateri
- IITB-Monash Research Academy, Indian Institute of Technology Bombay, Mumbai, India
| | - Tilak Kumar Gupta
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Paul J. Verma
- Centre for Reproduction and Development, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Ambarish Kunwar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Dulal Panda
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai, India
- * E-mail:
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Mancuso L, Jürjens G, Hermane J, Harmrolfs K, Eichner S, Fohrer J, Collisi W, Sasse F, Kirschning A. Bioreduction of aryl azides during mutasynthesis of new ansamitocins. Org Lett 2013; 15:4442-5. [PMID: 23981134 DOI: 10.1021/ol401989e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Supplementing a culture of a mutant strain of Actinosynnema pretiosum that is unable to biosynthesize aminohydroxy benzoic acid (AHBA), with 3-azido-5-hydroxy-benzoic acid and 3-azido-5-amino-benzoic acid, unexpectedly yielded anilino ansamitocins instead of the expected azido derivatives. This is the first example of the bioreduction of organic azides. The unique nature of these results was demonstrated when 3-azido-5-amino-benzoic acid was fed to the corresponding AHBA blocked mutant of Streptomyces hygroscopicus, the geldanamycin producer. This mutasynthetic experiment yielded the fully processed azido derivative of geldanamycin.
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Affiliation(s)
- Lena Mancuso
- Institut für Organische Chemie und Biomolekulares Wikstoffzentrum (BMWZ) der Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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19
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Ueberschaar N, Dahse HM, Bretschneider T, Hertweck C. Rational Design of an Apoptosis-Inducing Photoreactive DNA Intercalator. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302439] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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20
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Ueberschaar N, Dahse HM, Bretschneider T, Hertweck C. Rational Design of an Apoptosis-Inducing Photoreactive DNA Intercalator. Angew Chem Int Ed Engl 2013; 52:6185-9. [DOI: 10.1002/anie.201302439] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2013] [Indexed: 01/22/2023]
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21
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Alcaide B, Almendros P, Quirós MT, Fernández I. Gold-catalyzed oxycyclization of allenic carbamates: expeditious synthesis of 1,3-oxazin-2-ones. Beilstein J Org Chem 2013; 9:818-26. [PMID: 23766795 PMCID: PMC3678844 DOI: 10.3762/bjoc.9.93] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 03/26/2013] [Indexed: 01/07/2023] Open
Abstract
A combined experimental and computational study on regioselective gold-catalyzed synthetic routes to 1,3-oxazinan-2-ones (kinetically controlled products) and 1,3-oxazin-2-one derivatives (thermodynamically favored) from easily accessible allenic carbamates has been carried out.
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Affiliation(s)
- Benito Alcaide
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040-Madrid, Spain
| | - Pedro Almendros
- Instituto de Química Orgánica General (IQOG), Consejo Superior de Investigaciones Científicas (CSIC), Juan de la Cierva 3, 28006-Madrid, Spain
| | - M Teresa Quirós
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040-Madrid, Spain
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040-Madrid, Spain
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22
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Tibrewal N, Downey TE, Van Lanen SG, Ul Sharif E, O'Doherty GA, Rohr J. Roles of the synergistic reductive O-methyltransferase GilM and of O-methyltransferase GilMT in the gilvocarcin biosynthetic pathway. J Am Chem Soc 2012; 134:12402-5. [PMID: 22800463 DOI: 10.1021/ja305113d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two enzymes of the gilvocarcin biosynthetic pathway, GilMT and GilM, with unclear functions were investigated by in vitro studies using purified, recombinant enzymes along with synthetically prepared intermediates. The studies revealed GilMT as a typical S-adenosylmethionine (SAM) dependent O-methyltransferase, but GilM was identified as a pivotal enzyme in the pathway that exhibits dual functionality in that it catalyzes a reduction of a quinone intermediate to a hydroquinone, which goes hand-in-hand with a stabilizing O-methylation and a hemiacetal formation. GilM mediates its reductive catalysis through the aid of GilR that provides FADH(2) for the GilM reaction, through which FAD is regenerated for the next catalytic cycle. This unusual synergy eventually completes the biosynthesis of the polyketide-derived defuco-gilvocarcin chromphore.
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Affiliation(s)
- Nidhi Tibrewal
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536-0596, United States
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Kirschning A, Hahn F. Merging chemical synthesis and biosynthesis: a new chapter in the total synthesis of natural products and natural product libraries. Angew Chem Int Ed Engl 2012; 51:4012-22. [PMID: 22441812 DOI: 10.1002/anie.201107386] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Indexed: 01/05/2023]
Affiliation(s)
- Andreas Kirschning
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum, Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany.
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