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Characterization of Streptomyces piniterrae sp. nov. and Identification of the Putative Gene Cluster Encoding the Biosynthesis of Heliquinomycins. Microorganisms 2020; 8:microorganisms8040495. [PMID: 32244447 PMCID: PMC7232196 DOI: 10.3390/microorganisms8040495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 03/28/2020] [Accepted: 03/30/2020] [Indexed: 01/29/2023] Open
Abstract
A novel actinomycete producing heliquinomycin and 9’-methoxy-heliquinomycin, designated strain jys28T, was isolated from rhizosphere soil of Pinus yunnanensis and characterized using a polyphasic approach. The strain had morphological characteristics and chemotaxonomic properties identical to those of members of the genus Streptomyces. It formed spiral chains of spores with spiny surfaces. The menaquinones detected were MK-9(H6), MK-9(H8) and MK-9(H4). The major fatty acids were iso-C16:0, C15:0, C16:1ω7с and anteiso-C15:0. The phospholipids were diphosphatidylglycerol, phosphatidylmethylethanolamine, phosphatidylethanolamine and phosphatidylinositol mannoside. The DNA G + C content of the draft genome sequence, consisting of 8.5 Mbp, was 70.6%. Analysis of the 16S rRNA gene sequence showed that strain jys28T belongs to the genus Streptomyces with the highest sequence similarities to Streptomyces chattanoogensis NBRC 13058T (99.2%) and Streptomyces lydicus DSM 40002T (99.2%) and phylogenetically clustered with them. Multilocus sequence analysis based on five other house-keeping genes (atpD, gyrB, rpoB, recA and trpB) and the low level of DNA–DNA relatedness and phenotypic differences allowed the novel isolate to be differentiated from its most closely related strains. Therefore, the strain is concluded to represent a novel species of the genus Streptomyces, for which the name Streptomycespiniterrae sp. nov. is proposed. Furthermore, the putative biosynthetic gene cluster of heliquinomycins was identified and the biosynthetic pathway was discussed. The type strain is jys28T (=CCTCC AA 2018051T =DSM 109823T).
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2
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Willis NJ, Bray CD. An ortho-quinone methide based strategy towards the rubromycin spiroketal family. RSC Adv 2015. [DOI: 10.1039/c5ra17108c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A method for the generation/in situhetero-Diels–Alder cycloaddition of a trisubstitutedortho-quinone methide (o-QM) is described.
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Affiliation(s)
- N. J. Willis
- Department of Chemistry
- Queen Mary University of London
- London E1 4NS
- United Kingdom
| | - C. D. Bray
- Department of Chemistry
- Queen Mary University of London
- London E1 4NS
- United Kingdom
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3
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Sekaran V, Soares J, Jarstfer MB. Telomere Maintenance as a Target for Drug Discovery. J Med Chem 2013; 57:521-38. [DOI: 10.1021/jm400528t] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Vijay Sekaran
- Division of Chemical Biology
and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Joana Soares
- Division of Chemical Biology
and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Michael B. Jarstfer
- Division of Chemical Biology
and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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4
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Bandichhor R, Lowell AN, Kozlowski MC. Alternative spiroketalization methods toward purpuromycin: a hemiketal conjugate addition strategy and use of an electron-rich isocoumarin precursor. J Org Chem 2011; 76:6475-87. [PMID: 21707092 DOI: 10.1021/jo200398v] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two methods are presented that were designed to circumvent the persistent problem of benzofuran formation and instead yield a spiroketal of the rubromycin family type. First, using an alternative disconnection, a hemiketal conjugate addition to a naphthaquinone electrophile was investigated. Synthesis of the requisite electrophile provided insight into the selective oxidation and functionalization of the naphthalene portion. Second, the electronic features of the isocoumarin ring system were adjusted, and the corresponding reactivity further supports the hypothesis that electron-rich isocoumarins are capable of spiroketalization. Robust, flexible syntheses from simple precursors were developed that allowed multiple reduced isocoumarins to be generated. Combined, the data presented herein give insight into the sensitivities of this family and illuminate other potential methods of spiroketalization. In addition, the convergent assembly of substrates containing different naphthaquinone and isocoumarin subunits highlights the utility of our 1,3-dipolar cycloaddition approach to generate analogs of these structures for SAR, as well as chemical reactivity studies.
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Affiliation(s)
- Rakeshwar Bandichhor
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
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5
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Potential applications of laccase-mediated coupling and grafting reactions: A review. Enzyme Microb Technol 2011; 48:195-208. [DOI: 10.1016/j.enzmictec.2010.11.007] [Citation(s) in RCA: 237] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 11/02/2010] [Accepted: 11/23/2010] [Indexed: 11/21/2022]
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6
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Hahn V, Mikolasch A, Manda K, Gördes D, Thurow K, Schauer F. Laccase-catalyzed carbon-nitrogen bond formation: coupling and derivatization of unprotected L-phenylalanine with different para-hydroquinones. Amino Acids 2008; 37:315-21. [PMID: 18695937 DOI: 10.1007/s00726-008-0154-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 07/10/2008] [Indexed: 11/26/2022]
Abstract
Unprotected L-phenylalanine was derivatized by an innovative enzymatic method by means of laccases from Pycnoporus cinnabarinus and Myceliophthora thermophila. During the incubation of L-phenylalanine with para-hydroquinones using laccase as biocatalyst, one or two main products were formed. Dependent on the substitution grade of the hydroquinones mono- and diaminated products were detected. Differences of the used laccases are discussed. The described reactions are of interest for the derivatization of amino acids and a synthesis of pharmacological-active amino acid structures in the field of white biotechnology.
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Affiliation(s)
- V Hahn
- Institut für Mikrobiologie, Ernst-Moritz-Arndt-Universität Greifswald, F.-L.-Jahnstr. 15, 17487 Greifswald, Germany.
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7
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Nakamura R, Takeuchi R, Kuramochi K, Mizushina Y, Ishimaru C, Takakusagi Y, Takemura M, Kobayashi S, Yoshida H, Sugawara F, Sakaguchi K. Chemical properties of fatty acid derivatives as inhibitors of DNA polymerases. Org Biomol Chem 2007; 5:3912-21. [PMID: 18043794 DOI: 10.1039/b710944j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this study, the chemical properties of organic acids as DNA polymerase inhibitors were examined. In total, we assayed the inhibitory activities of 23 compounds. We found that the DNA synthesis activity of DNA polymerase was usually reduced to less than 50% in the presence of 100 microM monoprotic acids, which have a Clog P value greater than 7.0 and a pK(a) value less than 5.4. With a minor modification these chemical properties applied to several organic fatty acids previously reported as DNA polymerase inhibitors. Moreover, we also examined the inhibitory activities of perfluorooctadecanoic acid (PFOdA) and perfluorooctanesulfonic acid (PFOS) against DNA polymerase beta in detail. These compounds inhibited the polymerase activity of pol beta competitively with template-primer DNA, and non-competitively with dNTPs. In addition, the 8 kDa domain-defective pol beta was also sensitive to these compounds. Our results suggest that the inhibitory mode of action of PFOdA and PFOS is different from that mediated by the classic fatty acid inhibitors against DNA polymerase beta.
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Affiliation(s)
- Ryoichi Nakamura
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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8
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Brasholz M, Sörgel S, Azap C, Reißig H. Rubromycins: Structurally Intriguing, Biologically Valuable, Synthetically Challenging Antitumour Antibiotics. European J Org Chem 2007. [DOI: 10.1002/ejoc.200601054] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Malte Brasholz
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany, Fax: +49‐30‐838‐55367
| | - Sebastian Sörgel
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany, Fax: +49‐30‐838‐55367
| | - Cengiz Azap
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany, Fax: +49‐30‐838‐55367
| | - Hans‐Ulrich Reißig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany, Fax: +49‐30‐838‐55367
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Sörgel S, Azap C, Reißig HU. Preparation of Highly Alkoxy-Substituted Naphthaldehyde Derivatives – A Regioselective Approach to Building Blocks for the Synthesis of Rubromycins. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600353] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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Kuriyama I, Musumi K, Yonezawa Y, Takemura M, Maeda N, Iijima H, Hada T, Yoshida H, Mizushina Y. Inhibitory effects of glycolipids fraction from spinach on mammalian DNA polymerase activity and human cancer cell proliferation. J Nutr Biochem 2005; 16:594-601. [PMID: 16081275 DOI: 10.1016/j.jnutbio.2005.02.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2005] [Revised: 02/21/2005] [Accepted: 02/22/2005] [Indexed: 11/30/2022]
Abstract
We succeeded in purifying the fraction containing the major glycolipids in monogalactosyl diacylglycerol, digalactosyl diacylglycerol and sulfoquinovosyl diacylglycerol (SQDG) from dried vegetables. This glycolipids fraction was an inhibitor of DNA polymerase alpha (pol alpha) in vitro and also the proliferation of human cancer cells. In this study, eight common vegetables were investigated in terms of the glycolipids fraction, the amounts of major glycolipids, mammalian DNA polymerase inhibitory activity and antiproliferative activity toward human cancer cells. Green tea possessed the largest amount of glycolipids overall. Spinach contained the largest amount of SQDG, followed by parsley, green onion, chive, sweet pepper, green tea, carrot and garlic. Spinach had the strongest inhibitory effect on pol alpha activity and human cancer cell proliferation. A significant correlation was found between SQDG content and inhibition of DNA polymerase. Therefore, the inhibition of pol alpha activity by SQDG may lead to cell growth suppression. Of the six subspecies of spinach (Spinacia oleracea) tested, "Anna" had the largest amount of SQDG, strongest inhibitory activity toward DNA polymerase and greatest effect on human cancer cell proliferation. Based on these results, the glycolipids fraction from spinach is potentially a source of food material for a novel anticancer activity.
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Affiliation(s)
- Isoko Kuriyama
- Department of Nutritional Science, Laboratory of Food and Nutritional Sciences, Kobe-Gakuin University, Kobe, Hyogo 651-2180, Japan
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11
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Maeda N, Hada T, Murakami-Nakai C, Kuriyama I, Ichikawa H, Fukumori Y, Hiratsuka J, Yoshida H, Sakaguchi K, Mizushina Y. Effects of DNA polymerase inhibitory and antitumor activities of lipase-hydrolyzed glycolipid fractions from spinach. J Nutr Biochem 2005; 16:121-8. [PMID: 15681172 DOI: 10.1016/j.jnutbio.2004.08.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Accepted: 08/09/2004] [Indexed: 11/28/2022]
Abstract
We succeeded in purifying the major glycolipid fraction in the class of sulfoquinovosyl diacylglycerol, monogalactosyl diacylglycerol and digalactosyl diacylglycerol (DGDG) from a green vegetable, spinach (Spinacia oleracea L.). This glycolipid fraction was an inhibitor of DNA polymerases and a growth inhibitor of NUGC-3 human gastric cancer cells, and, interestingly, the activities were much stronger when the fraction was hydrolyzed by lipase. Glycolipids in the hydrolyzed fraction consisted of sulfoquinovosyl monoacylglycerol (SQMG), monogalactosyl monoacylglycerol (MGMG) and DGDG. In the in vivo antitumor assay using Greene's melanoma, the fraction containing SQMG, MGMG and DGDG showed to be a promising suppressor of solid tumors. Spinach glycolipid fraction might be a potent antitumor compound if directly injected into a tumor-carrying body, and this fraction may be a healthy food material that has antitumor activity.
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Affiliation(s)
- Naoki Maeda
- Laboratory of Food & Nutritional Sciences, Department of Nutritional Science, Kobe-Gakuin University, Nishi-ku, Kobe, Hyogo 651-2180, Japan
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12
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Mizushina Y, Maeda N, Kawasaki M, Ichikawa H, Murakami C, Takemura M, Xu X, Sugawara F, Fukumori Y, Yoshida H, Sakaguchi K. Inhibitory action of emulsified sulfoquinovosyl acylglycerol on mammalian DNA polymerases. Lipids 2003; 38:1065-74. [PMID: 14669972 DOI: 10.1007/s11745-006-1162-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We reported previously that sulfoquinovosyl diacylglycerol and sulfoquinovosyl monoacylglycerol (SQDG/SQMG) are potent inhibitors of mammalian DNA polymerases and DNA topoisomerase II, and can be potent immunosuppressive agents and anticancer chemotherapy agents [Matsumoto, Y., Sahara, H., Fujita T., Shimozawa, K., Takenouchi, M., Torigoe, T., Hanashima, S., Yamazaki, T., Takahashi, S., Sugawara, F., et al., An Immunosuppressive Effect by Synthetic Sulfonolipids Deduced from Sulfonoquinovosyl Diacylglycerols of Sea Urchin, Transplantation 74, 261-267 (2002); Sahara, H., Hanashima, S., Yamazaki, T., Takahashi, S., Sugawara, F., Ohtani, S., Ishikawa, M., Mizushina, Y., Ohta, K., Shimozawa, K., et al., Anti-tumor Effect of Chemically Synthesized Sulfolipids Based on Sea Urchin's Natural Sulfonoquinovosylmonoacylglycerols, Jpn. J. Cancer Res. 93, 85-92 (2002)]. In those experiments, the in vivo effectiveness greatly depended on the degree of water solubility of SQDG/SQMG. In the present work, we studied the emulsification of SQDG/SQMG in terms of their use in in vivo experiments. Lipid emulsions containing SQDG/SQMG (oil-in-water emulsions) in which the particle size was smaller than 100 nm were designed and synthesized, and then the biochemical modes of emulsified SQDG/SQMG were studied in comparison with those of SQDG/SQMG solubilized by DMSO. Emulsified SQDG/SQMG are also selective mammalian DNA polymerase inhibitors and potent antineoplastic agents but do not inhibit the DNA topoisomerase II activity. The growth inhibition effect of emulsified SQMG to NUGC-3 cancer cells was twofold stronger than DMSO-soluble SQMG (69 and 151 microM, respectively). From these results, the properties of lipid emulsions containing SQDG/SQMG and their possible use in in vivo experiments including clinical use are discussed.
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Affiliation(s)
- Yoshiyuki Mizushina
- Laboratory of Food and Nutritional Sciences, Kobe-Gakuin University, Nishi-ku, Kobe, Hyogo 651-2180, Japan.
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Mizushina Y, Ishidoh T, Kamisuki S, Nakazawa S, Takemura M, Sugawara F, Yoshida H, Sakaguchi K. Flavonoid glycoside: a new inhibitor of eukaryotic DNA polymerase alpha and a new carrier for inhibitor-affinity chromatography. Biochem Biophys Res Commun 2003; 301:480-7. [PMID: 12565887 DOI: 10.1016/s0006-291x(02)03083-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Two flavonoid glycosides, kaempferol 3-O-(6"-acetyl)-beta-glucopyranoside (KAG) and quercetin 3-O-(6"-acetyl)-beta-glucopyranoside (QAG), were found to be inhibitors of eukaryotic DNA polymerases from a Japanese vegetable, Petasites japonicus. These compounds inhibited the activities of mammalian replicative DNA polymerases (i.e., pol alpha, delta, and epsilon), but not other pol beta, eta, kappa, and lambda activities. KAG was a stronger inhibitor and more selective to pol alpha than QAG. The IC(50) values of KAG for pol alpha, delta, and epsilon were 41, 164, and 127 microM, respectively. The pol alpha inhibition by KAG was non-competitive with respect to both the DNA template-primer and the dNTP substrate. KAG and QAG did not influence the activities of prokaryotic DNA polymerases or other mammalian DNA metabolic enzymes such as human immunodeficiency virus type 1 reverse transcriptase, human telomerase, human DNA topoisomerase I and II, T7 RNA polymerase, and bovine deoxyribonuclease I. Therefore, we concluded that these flavonoid glycosides are moderate replicative DNA polymerase inhibitors leaning more relatively to pol alpha, and could be used as chromatographic carriers to purify the DNA polymerases rather than cytotoxic agents. We then made a KAG-conjugated column such as the epoxy-activated Sepharose 6B. In the column, pol alpha was selectively adsorbed and eluted.
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Affiliation(s)
- Yoshiyuki Mizushina
- Laboratory of Food and Nutritional Sciences, Department of Nutritional Science and High Tecnology Research Center, Kobe-Gakuin University, Nishi-ku, Kobe, Hyogo 651-2180, Japan.
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Murakami C, Kumagai T, Hada T, Kanekazu U, Nakazawa S, Kamisuki S, Maeda N, Xu X, Yoshida H, Sugawara F, Sakaguchi K, Mizushina Y. Effects of glycolipids from spinach on mammalian DNA polymerases. Biochem Pharmacol 2003; 65:259-67. [PMID: 12504801 DOI: 10.1016/s0006-2952(02)01483-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We purified the major glycolipids in the class of monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG) and sulfoquinovosyl diacylglycerol (SQDG) from a green vegetable, spinach (Spinacia oleracea L.). MGDG was an inhibitor of the growth of NUGC-3 human gastric cancer cells, but DGDG and SQDG had no such cytotoxic effect. Therefore, we studied MGDG and its monoacyglycerol-form, monogalactosyl monoacylglycerol (MGMG), in detail. MGMG with one fatty acid molecule was obtained from MGDG with two fatty acid molecules by hydrolyzing with a pancreatic lipase. MGMG was also found to prevent the cancer cell growth. MGDG was a potent inhibitor of replicative DNA polymerases such as alpha, delta and epsilon. MGMG inhibited the activities of all mammalian DNA polymerases including repair-related DNA polymerase beta with IC(50) values of 8.5-36 microg/mL, and the inhibition by MGMG was stronger than that by MGDG. Both MGDG and MGMG could halt the cell cycle at the G1 phase, and subsequently induced severe apoptosis. The relationship between the DNA polymerase inhibition and the cell growth effect by these glycolipids is discussed.
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Affiliation(s)
- Chikako Murakami
- Laboratory of Food and Nutritional Sciences, Department of Nutritional Science, Kobe-Gakuin University, Nishi-ku, Kobe, Hyogo 651-2180, Japan
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Murakami C, Yamazaki T, Hanashima S, Takahashi S, Ohta K, Yoshida H, Sugawara F, Sakaguchi K, Mizushina Y. Structure-function relationship of synthetic sulfoquinovosyl-acylglycerols as mammalian DNA polymerase inhibitors. Arch Biochem Biophys 2002; 403:229-36. [PMID: 12139972 DOI: 10.1016/s0003-9861(02)00219-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We reported previously that sulfo-glycolipids such as sulfoquinovosyl-diacylglycerol (SQDG) and sulfoquinovosyl-monoacylglycerol (SQMG) are potent inhibitors of DNA polymerase alpha and beta and antineoplastic agents. Then, we succeeded in synthesizing SQDG and SQMG chemically, including their stereoisomers, glucopyranosyl-diacylglycerol (GDG) and glucopyranosyl-monoacylglycerol (GMG). In this study, we demonstrated the structure-function relationship of the synthetic sulfo-glycolipids to DNA polymerase alpha and beta and their relationship to the cytotoxic activity. Both SQDG and SQMG inhibited the activity of mammalian DNA polymerase alpha with IC(50) values of 3-5 microM, but GMG only moderately inhibited it. GDG, diacylglycerol (DG), and monoacylglycerol (MG) did not influence any of the DNA polymerase activities. The sulfate moiety in the quinovose was important in inhibiting the enzyme activity. The one-fatty-acid-sulfo-glycolipids, SQMG, GMG, and MG, prevented the growth of NUGC-3 human gastric cancer cells and induced apoptotic cell death, but the two-fatty-acid-sulfo-glycolipids, SQDG, GDG, and DG, did not. SQMG and GMG could halt the cell cycle at the G1 phase, but the cell cycle was not changed by MG. The relationship between the DNA polymerase inhibition and the cell growth effect by these compounds are discussed.
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Affiliation(s)
- Chikako Murakami
- Laboratory of Food and Nutritional Sciences, Department of Nutritional Science, Kobe-Gakuin University, Nishi-ku, Kobe, 651-2180, Hyogo, Japan
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Mizushina Y, Kamisuki S, Kasai N, Shimazaki N, Takemura M, Asahara H, Linn S, Yoshida S, Matsukage A, Koiwai O, Sugawara F, Yoshida H, Sakaguchi K. A plant phytotoxin, solanapyrone A, is an inhibitor of DNA polymerase beta and lambda. J Biol Chem 2002; 277:630-8. [PMID: 11677229 DOI: 10.1074/jbc.m105144200] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Solanapyrone A, a phytotoxin and enzyme inhibitor isolated from a fungus (SUT 01B1-2) selectively inhibits the activities of mammalian DNA polymerase beta and lambda (pol beta and lambda) in vitro. The IC50 values of the compound were 30 microm for pol beta and 37 microm for pol lambda. Because pol beta and lambda are in a family and their three-dimensional structures are thought to be highly similar to each other, we used pol beta to analyze the biochemical relationship with solanapyrone A. On pol beta, solanapyrone A antagonistically competed with both the DNA template and the nucleotide substrate. BIAcore analysis demonstrated that solanapyrone A bound selectively to the N-terminal 8-kDa domain of pol beta. This domain is known to bind single-stranded DNA, provide 5'-phosphate recognition of gapped DNA, and cleave the sugar-phosphate bond 3' to an intact apurinic/apyrimidinic (AP) site (i.e. AP lyase activity) including 5'-deoxyribose phosphate lyase activity. Solanapyrone A inhibited the single-stranded DNA-binding activity but did not influence the activities of the 5'-phosphate recognition in gapped DNA structures and the AP lyase. Based on these results, the inhibitory mechanism of solanapyrone A is discussed.
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Affiliation(s)
- Yoshiyuki Mizushina
- Laboratory of Food & Nutritional Sciences, Department of Nutritional Science, Kobe-Gakuin University, Nishi-ku, Kobe, Hyogo 651-2180, Japan.
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