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Wu C, Medema MH, Läkamp RM, Zhang L, Dorrestein PC, Choi YH, van Wezel GP. Leucanicidin and Endophenasides Result from Methyl-Rhamnosylation by the Same Tailoring Enzymes in Kitasatospora sp. MBT66. ACS Chem Biol 2016; 11:478-90. [PMID: 26675041 DOI: 10.1021/acschembio.5b00801] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The increasing bacterial multidrug resistance necessitates novel drug-discovery efforts. One way to obtain novel chemistry is glycosylation, which is prevalent in nature, with high diversity in both the sugar moieties and the targeted aglycones. Kitasatospora sp. MBT66 produces endophenaside antibiotics, which is a family of (methyl-)rhamnosylated phenazines. Here we show that this strain also produces the plecomacrolide leucanicidin (1), which is derived from bafilomycin A1 by glycosylation with the same methyl-rhamnosyl moiety as present in the endophenasides. Immediately adjacent to the baf genes for bafilomycin biosynthesis lie leuA and leuB, which encode a sugar-O-methyltransferase and a glycosyltransferase, respectively. LeuA and LeuB are the only enzymes encoded by the genome of Kitasatospora sp. MBT66 that are candidates for the methyl-rhamnosylation of natural products, and mutation of leuB abolished glycosylation of both families of natural products. Thus, LeuA and -B mediate the post-PKS methyl-rhamnosylation of bafilomycin A1 to leucanicidin and of phenazines to endophenasides, showing surprising promiscuity by tolerating both macrolide and phenazine skeletons as the substrates. Detailed metabolic analysis by MS/MS based molecular networking facilitated the characterization of nine novel phenazine glycosides 6-8, 16, and 22-26, whereby compounds 23 and 24 represent an unprecedented tautomeric glyceride phenazine, further enriching the structural diversity of endophenasides.
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Affiliation(s)
- Changsheng Wu
- Molecular
Biotechnology, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
- Natural
Products Laboratory, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
| | - Marnix H. Medema
- Bioinformatics
Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Rianne M. Läkamp
- Molecular
Biotechnology, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
- Collaborative
Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and
Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman
Drive, La Jolla, California 92093-0751, United States
| | - Le Zhang
- Molecular
Biotechnology, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
| | - Pieter C. Dorrestein
- Collaborative
Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and
Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman
Drive, La Jolla, California 92093-0751, United States
| | - Young Hae Choi
- Natural
Products Laboratory, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
| | - Gilles P. van Wezel
- Molecular
Biotechnology, Institute of Biology, Leiden University, Sylviusweg
72, 2333 BE Leiden, The Netherlands
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Caboni P, Tronci L, Liori B, Tocco G, Sasanelli N, Diana A. Tulipaline A: structure-activity aspects as a nematicide and V-ATPase inhibitor. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2014; 112:33-39. [PMID: 24974115 DOI: 10.1016/j.pestbp.2014.05.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/12/2014] [Accepted: 05/15/2014] [Indexed: 06/03/2023]
Abstract
Carbonyl groups are known to form covalent adducts with endogenous proteins, but so far, their nematicidal mechanism of action of has been overlooked. The nematicidal activity of ten lactones was tested in vitro against the root knot nematodes Meloidogyne incognita and Meloidogynearenaria. In particular, the saturated lactones α-methylene-γ-butyrolactone or tulipaline A (1) and γ-butyrolactone (3) were active against M. incognita with an EC50/48h of 19.3±10.0 and 40.0±16.2mg/L respectively. Moreover the α, β-unsaturated lactone 5,6-dihydro-2H-pyran-2-one (2) exhibited the strongest nematicidal activity against the two species with EC50/48h 14.5±5.3 and 21.2±9.7mg/L respectively. Here we propose that the toxic effects of lactones and aldehydes on M.incognita and M. arenaria might be a consequence of their vacuolar-type H(+)-ATPase (V-ATPase) inhibition activity; in fact α-methylene-γ-butyrolactone (1) and salicylaldehyde (12) produced an increased pH in lysosomal-like organelles on HeLa human cell line and this alteration was most likely related to a V-ATPase impairment.
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Affiliation(s)
- Pierluigi Caboni
- Department of Life and Environmental Sciences, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy.
| | - Laura Tronci
- Department of Life and Environmental Sciences, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
| | - Barbara Liori
- Department of Life and Environmental Sciences, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
| | - Graziella Tocco
- Department of Life and Environmental Sciences, University of Cagliari, via Ospedale 72, 09124 Cagliari, Italy
| | - Nicola Sasanelli
- Institute for Plant Protection, C.N.R., via G. Amendola 122/D, 70126 Bari, Italy
| | - Andrea Diana
- Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
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Chemoresistance to concanamycin A1 in human oral squamous cell carcinoma is attenuated by an HDAC inhibitor partly via suppression of Bcl-2 expression. PLoS One 2013; 8:e80998. [PMID: 24278362 PMCID: PMC3835574 DOI: 10.1371/journal.pone.0080998] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Accepted: 10/08/2013] [Indexed: 01/17/2023] Open
Abstract
V-ATPase is involved in the acidification of the microenvironment around/in solid tumors, such as oral squamous cell carcinoma (OSCC). V-ATPase is thought to induce tumor invasion and multi-drug resistance in several malignant tumors, and it also contributes to maintaining the intracellular pH under an acidic microenvironment by inducing proton extrusion into the extracellular medium. However, there is little information regarding the effects of V-ATPase inhibitors on OSCCs. In this study, the effects of a V-ATPase inhibitor, concanamycin A1 (CMA), on the proliferation and apoptosis of OSCC were investigated in vitro. We used four OSCC cell lines, MISK81-5, SAS, HSC-4 and SQUU-B. Acridine orange staining revealed that the red fluorescence was reduced in all of the low concentration CMA-treated OSCC cells, indicating that the acidification of vesicular organelles in the OSCCs was prevented by the treatment with low-concentration of CMA. CMA treatment induced apoptosis in MISK81-5, SAS and HSC-4 cells, but not in SQUU-B cells. The p-p38 expression was not altered in CMA-treated SQUU-B cells, but their levels were increased in the other cells. The Bax/Bcl-2 ratio in CMA-treated SQUU-B cells was dramatically decreased in comparison with that in the other cell lines treated with CMA. However, when the SQUU-B cells were treated with CMA and a histone deacetylase inhibitor, suberoylanilide hydroxamic acid (SAHA), the SQUU-B cells became more susceptible to the CMA-induced apoptosis. SAHA treatment led to a significantly decrease in the Bcl-2 expression in CMA-treated SQUU-B cells, resulting in a dramatically increased Bax/Bcl-2 ratio in comparison with that observed in the SQUU-B cells treated with CMA alone. These findings suggest that CMA could have an anti-tumor effect on OSCCs. In addition, combination of CMA with other agents, such as SAHA, could help improve the pro-apoptotic effects of CMA even in CMA-resistant OSCC cells.
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Kimura T, Kanagaki S, Matsui Y, Imoto M, Watanabe T, Shibasaki M. Synthesis and assignment of the absolute configuration of indenotryptoline bisindole alkaloid BE-54017. Org Lett 2012; 14:4418-21. [PMID: 22917065 DOI: 10.1021/ol3019314] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis of the indenotryptoline bisindole alkaloid, BE-54017, was accomplished using osmium-promoted cis-dihydroxylation of maleimide as a key step. After optical resolution, the absolute configuration of this molecule was determined by comparing its optical rotation and HPLC profile to those obtained for BE-54017 derived from enantiopure cladoniamide A, whose stereochemistry has been reported previously. BE-54017 with the correct absolute stereochemistry induced apoptosis of epidermal growth factor (EGF)-stimulated EGF receptor overexpressing A431 cells and inhibited vacuolar-type H(+)-ATPase (V-ATPase).
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Affiliation(s)
- Tomoyuki Kimura
- Institute of Microbial Chemistry, Tokyo, 3-14-23 Kamiosaki, Tokyo 141-0021, Japan
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Paterson I, Steadman neé Doughty VA, McLeod MD, Trieselmann T. Stereocontrolled total synthesis of (+)-concanamycin F: the strategic use of boron-mediated aldol reactions of chiral ketones. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Synthesis of C18–C28 ketone fragment of micromonospolide B possessing 1,3-diene and 1,3-anti-diol functionalities. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.07.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hong J, Yokomakura A, Nakano Y, Ishihara K, Kaneda M, Onodera M, Nakahama KI, Morita I, Niikura K, Ahn JW, Zee O, Ohuchi K. Inhibition of vacuolar-type (H+)-ATPase by the cytostatic macrolide apicularen A and its role in apicularen A-induced apoptosis in RAW 264.7 cells. FEBS Lett 2006; 580:2723-30. [PMID: 16647709 DOI: 10.1016/j.febslet.2006.04.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2006] [Revised: 03/31/2006] [Accepted: 04/04/2006] [Indexed: 11/27/2022]
Abstract
Apicularen A and the known vacuolar-type (H(+))-ATPase (V-ATPase) inhibitor bafilomycin A(1) induced apoptosis of RAW 264.7 cells, while apicularen B, an N-acetyl-glucosamine glycoside of apicularen A, was far less effective. Apicularen A inhibited vital staining with acridine orange of the intracellular organelles of RAW 264.7 cells, inhibited the ATP-dependent proton transport into inside-out microsome vesicles, and inhibited the bafilomycin A(1)-sensitive ATP hydrolysis. The IC(50) values of the proton transport were 0.58 nM for apicularen A, 13 nM for apicularen B, and 0.95 nM for bafilomycin A(1). Furthermore, apicularen A inhibited the bafilomycin A(1)-sensitive ATP hydrolysis more potently than apicularen B. F-ATPase and P-ATPase were not inhibited by apicularen A. We concluded that apicularen A inhibits V-ATPase, and thus induces apoptosis in RAW 264.7 cells.
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Affiliation(s)
- JangJa Hong
- Laboratory of Pathophysiological Biochemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba Aramaki, Sendai, Miyagi 980-8578, Japan
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Lu K, Huang M, Xiang Z, Liu Y, Chen J, Yang Z. Development of a Concise and Diversity-Oriented Approach for the Synthesis of Plecomacrolides via the Diene−Ene RCM. Org Lett 2006; 8:1193-6. [PMID: 16524301 DOI: 10.1021/ol060221v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A concise synthesis of the core structures of plecomacrolide with ring sizes varying from 16 to 19 atoms was achieved for the first time by the diene-ene ring-closing olefin metathesis reaction. This approach should allow access to the structurally diverse analogues of plecomacrolide.
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Affiliation(s)
- Kui Lu
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Beijing, China
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Abstract
The enantioselective total synthesis of the cytotoxic plecomacrolide natural product formamicin (1) is described. Key aspects of this synthesis include the efficient transacetalation reactions of MOM ethers 28 and 38 to form the seven-membered formyl acetals 29 and 39, a late-stage Suzuki cross-coupling reaction of the highly functionalized vinyl boronic acid 6 and vinyl iodide 7, a highly beta-selective glycosidation reaction of beta-hydroxy ketone 4 with 2,6-dideoxy-2-iodoglucopyranosyl fluoride 3, and the global desilylation of penultimate intermediate 77 mediated by in situ generated Et(3)N.2HF.
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Affiliation(s)
- Timothy B Durham
- Department of Chemistry, University of Michigan, 930 North University, Ann Arbor, Michigan 48109, USA
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Quéron E, Lett R. Synthetic studies on bafilomycin A1: stereoselective synthesis of the enantiopure C1–C11 fragment. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.04.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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