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Shimomura M, Ide K, Sakata J, Tokuyama H. Unified Divergent Total Synthesis of Discorhabdin B, H, K, and Aleutianamine via the Late-Stage Oxidative N,S-Acetal Formation. J Am Chem Soc 2023; 145:18233-18239. [PMID: 37556762 DOI: 10.1021/jacs.3c06578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
This study achieved the total syntheses of (+)-discorhabdin B, (-)-discorhabdin H, (+)-discorhabdin K, and (-)-aleutianamine. A phenethylamine fragment bearing a o-pivaloylthio group, corresponding to the D/E/G ring moiety, was prepared from benzothiophen-2-carboxylic acid methyl ester and condensed with a known pyrroloiminoquinone derivative. The adduct was subjected to [bis(trifluoroacetoxy)iodo]benzene (PIFA)-promoted oxidative spirocyclization to furnish the A/B/C/D/E spirocyclohexadienone fused with pyrroloiminoquinone. The total synthesis of (±)-discorhabdin B was completed via the key construction of the highly strained G ring with the N,S-acetal moiety featuring a newly developed CuBr2-mediated oxidative cascade cyclization. The stereocontrolled total synthesis of (+)-discorhabdin B was accomplished by a diastereoselective PIFA-promoted oxidative spirocyclization using a chiral thioester. (-)-Disocrhabdin H and (+)-discorhabdin K were synthesized by the site- and face-selective thia-Michael addition of l-ovothiol A to (+)-N-Ts-discorhabdin B with the concomitant formation of the F ring by forming the C2-N18 bond. The total synthesis of (-)-aleutianamine was achieved via a skeletal rearrangement initiated by the Luche reduction of the dienone moiety of (+)-N-Ts-discorhabdin B.
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Affiliation(s)
- Masashi Shimomura
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kohta Ide
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Juri Sakata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Noro T, Sakata J, Tokuyama H. Synthetic studies on discorhabdin V: Construction of the A–F hexacyclic framework. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Smith MW, Falk ID, Ikemoto H, Burns NZ. A Convenient C-H Functionalization Platform for Pyrroloiminoquinone Alkaloid Synthesis. Tetrahedron 2019; 75:3366-3370. [PMID: 31889735 DOI: 10.1016/j.tet.2019.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pyrroloiminoquinone alkaloids represent a structurally intriguing class of natural products that display an array of useful biological properties. Here, we present a versatile and scalable platform for the synthesis of this diverse family - and in particular the antitumor discorhabdins - built upon sequential selective C-H functionalization of tryptamine. The utility of this strategy is showcased through short formal syntheses of damirones A-C, makaluvamines D and I, and discorhadbin E. Additionally, we describe efforts to develop the first catalytic asymmetric entry to the discorhabdin subclass.
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Affiliation(s)
- Myles W Smith
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Isaac D Falk
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Hideya Ikemoto
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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Guseinov TO, Kuznetsova VE, Shershov VE, Spitsyn MA, Lapa SA, Zasedatelev AS, Chudinov AV. New Synthetic Route to CY5-Labeled 2'-Deoxycytidine- 5'-Triphosphates Using Sonogashira Reaction. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2018. [DOI: 10.1134/s1068162018020103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Rathod RV, Bera S, Singh M, Mondal D. A colorimetric and fluorometric investigation of Cu(ii) ion in aqueous medium with a fluorescein-based chemosensor. RSC Adv 2016. [DOI: 10.1039/c6ra03021a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
A colorimetric and fluorometric chemosensor, 1,4-bis(1-fluorescein)-2,3-diaza-1,3-butadiene (L, 3) as Schiff base is developed for naked-eye detection of Cu2+ ion in aqueous medium due to the formation of a 1 : 1 copper–ligand complex.
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Affiliation(s)
- Reena V. Rathod
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
| | - Smritilekha Bera
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
| | - Man Singh
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
| | - Dhananjoy Mondal
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
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Padwa A, Zou Y, Cheng B, Li H, Downer-Riley N, Straub CS. Intramolecular Cycloaddition Reactions of Furo[3,4-b]indoles for Alkaloid Synthesis. J Org Chem 2014; 79:3173-84. [DOI: 10.1021/jo500331j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Albert Padwa
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Yan Zou
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Bo Cheng
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Hao Li
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Nadale Downer-Riley
- Department
of Chemistry, University of the West Indies, Mona, Kingston 7, Jamaica
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Abstract
This contribution contains a representative sampling from the Padwa laboratory of the conjugate addition of oximes with 2,3-bis(phenylsulfonyl)-1,3-butadiene followed by a subsequent dipolar cycloaddition cascade to produce a variety of alkaloids. The resulting cycloadducts are cleaved reductively to provide azapolycyclic scaffolds with strategically placed functionality for further manipulation of the target compounds.
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Affiliation(s)
- Albert Padwa
- 1Department of Chemistry, Emory University, Atlanta, GA 30322, USA
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Hu JF, Fan H, Xiong J, Wu SB. Discorhabdins and Pyrroloiminoquinone-Related Alkaloids. Chem Rev 2011; 111:5465-91. [DOI: 10.1021/cr100435g] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jin-Feng Hu
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, No. 826 Zhangheng Road, Shanghai 201203, China
| | - Hui Fan
- Department of Natural Products for Chemical Genetic Research, Key Laboratory of Brain Functional Genomics, Ministry of Education, East China Normal University, No. 3663 Zhongshan Road N, Shanghai 200062, China
| | - Juan Xiong
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, No. 826 Zhangheng Road, Shanghai 201203, China
| | - Shi-Biao Wu
- Department of Natural Products for Chemical Genetic Research, Key Laboratory of Brain Functional Genomics, Ministry of Education, East China Normal University, No. 3663 Zhongshan Road N, Shanghai 200062, China
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Ustinov AV, Stepanova IA, Dubnyakova VV, Zatsepin TS, Nozhevnikova EV, Korshun VA. Modification of nucleic acids using [3 + 2]-dipolar cycloaddition of azides and alkynes. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2010; 36:437-81. [DOI: 10.1134/s1068162010040011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Iron-Catalyzed Regioselective Hydroaryloxylation of CC Triple Bonds: An Efficient Synthesis of 2H-1-Benzopyran Derivatives. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900483] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ishino Y, Mihara M, Hayakawa N, Miyata T, Kaneko Y, Miyata T. AN IMPROVED METHOD FOR SYNTHESIS OF 1-BENZOPYRANS FROM UNSATURATED ALCOHOLS AND PHENOLS USING A CATALYTIC AMOUNT OF ACIDS. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-100000537] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Korshun VA, Manasova EV, Balakin KV, Malakhov AD, Perepelov AV, Sokolova TA, Berlin YA. New Fluorescent Nucleoside Derivatives -5-Alkynylated 2-Deoxyuridines. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/07328319808004718] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- V. A. Korshun
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - E. V. Manasova
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - K. V. Balakin
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - A. D. Malakhov
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - A. V. Perepelov
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - T. A. Sokolova
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
| | - Yu. A. Berlin
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , ul. Miklukho-Maklaya 16/10, GSP-7, Moscow , 117871 , Russia
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Skorobogatyi MV, Malakhov AD, Pchelintseva AA, Turban AA, Bondarev SL, Korshun VA. Fluorescent 5-Alkynyl-2′-Deoxyuridines: High Emission Efficiency of a Conjugated Perylene Nucleoside in a DNA Duplex. Chembiochem 2006; 7:810-6. [PMID: 16572492 DOI: 10.1002/cbic.200600040] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Four fluorescent 5-alkynyl-2'-deoxyuridines were studied in DNA oligonucleotides and their duplexes. The fluorescence response to hybridization differs dramatically for nucleosides containing a perylene fluorochrome either conjugated or not conjugated to the nucleobase. The conjugated nucleoside, 5-(perylen-3-ylethynyl)-2'-deoxyuridine, shows enhanced long-wavelength emission in the DNA duplex, in contrast to the blue fluorescence of perylene on a flexible linker (in 5-[(perylen-3-yl)methoxyprop-1-ynyl]-2'-deoxyuridine), which is quenched upon duplex formation.
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Affiliation(s)
- Mikhail V Skorobogatyi
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, Moscow 117997, Russia
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Ladurée D, Fossey C, Delbederi Z, Sugeac E, Schmidt S, Laumond G, Aubertin AM. Synthesis and antiviral activity of aryl phosphoramidate derivatives of beta-D- and beta-L-C-5-substituted 2',3'-didehydro-2',3'-dideoxy-uridine bearing linker arms. J Enzyme Inhib Med Chem 2006; 20:533-49. [PMID: 16408789 DOI: 10.1080/14756360500220343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
We have previously reported the synthesis and evaluation of potent anti-human immunodeficiency virus compounds based on beta-D-d4T analogues bearing a tether attached at the C-5 position and their beta-L-counterparts. Initial study revealed a requirement for an alkyl side-chain with an optimal length of 12 carbons for a weak antiviral activity. As a continuation of that work, we have now prepared the corresponding phosphoramidate derivatives as possible membrane-permeable prodrugs. Phosphorochloridate chemistry gave the target phosphoramidates which were tested for anti-human immunodeficiency virus type 1 activity; unfortunately, they were devoid of anti-HIV activity.
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Affiliation(s)
- Daniel Ladurée
- Centre d'Etudes et de Recherche sur le Médicament de Normandie, U. F. R. des Sciences Pharmaceutiques, 5, Rue Vaubénard, F-14032, Caen Cedex, France.
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18
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McGuigan C, Pathirana RN, Snoeck R, Andrei G, De Clercq E, Balzarini J. Discovery of a New Family of Inhibitors of Human Cytomegalovirus (HCMV) Based upon Lipophilic Alkyl Furano Pyrimidine Dideoxy Nucleosides: Action via a Novel Non-Nucleosidic Mechanism. J Med Chem 2004; 47:1847-51. [PMID: 15027877 DOI: 10.1021/jm030857h] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Following our discovery of the potent anti-varicella zoster virus action of lipophilic alkyl furano pyrimidine 2'-deoxynucleosides, we now report that 2',3'-dideoxy sugar analogues are devoid of anti-VZV activity but are potent and selective inhibitors of human cytomegalovirus (HCMV). The present compounds are active in vitro at ca. 1 microM with cytotoxicity only above 200 microM. Importantly, we have discovered that the new agents do not act as nucleoside analogues, despite their nucleosidic structure, and time of addition studies revealed that the compounds may inhibit HCMV at an event in the replication cycle of the virus that precedes DNA synthesis. They represent new leads in the discovery of improved therapies for HCMV, particularly in view of their novel mechanism of action.
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Affiliation(s)
- Christopher McGuigan
- Welsh School of Pharmacy, Cardiff University, King Edward VII Avenue, Cardiff CF10 3XF, UK.
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Cassady JM, Chan KK, Floss HG, Leistner E. Recent Developments in the Maytansinoid Antitumor Agents. Chem Pharm Bull (Tokyo) 2004; 52:1-26. [PMID: 14709862 DOI: 10.1248/cpb.52.1] [Citation(s) in RCA: 234] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Maytansine and its congeners have been isolated from higher plants, mosses and from an Actinomycete, Actinosynnema pretiosum. Many of these compounds are antitumor agents of extraordinary potency, yet phase II clinical trials with maytansine proved disappointing. The chemistry and biology of maytansinoids has been reviewed repeatedly in the late 1970s and early 1980s; the present review covers new developments in this field during the last two decades. These include the use of maytansinoids as "warheads" in tumor-specific antibodies, preliminary metabolism studies, investigations of their biosynthesis at the biochemical and genetic level, and ecological issues related to the occurrence of such typical microbial metabolites in higher plants.
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Affiliation(s)
- John M Cassady
- College of Pharmacy, The Ohio State University, 500 West 12th Avenue, Columbus, OH 43210, USA
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Tanaka K, Miura T, Umezawa N, Urano Y, Kikuchi K, Higuchi T, Nagano T. Rational design of fluorescein-based fluorescence probes. Mechanism-based design of a maximum fluorescence probe for singlet oxygen. J Am Chem Soc 2001; 123:2530-6. [PMID: 11456921 DOI: 10.1021/ja0035708] [Citation(s) in RCA: 290] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fluorescein is one of the best available fluorophores for biological applications, but the factors that control its fluorescence properties are not fully established. Thus, we initiated a study aimed at providing a strategy for rational design of functional fluorescence probes bearing fluorescein structure. We have synthesized various kinds of fluorescein derivatives and examined the relationship between their fluorescence properties and the highest occupied molecular orbital (HOMO) levels of their benzoic acid moieties obtained by semiempirical PM3 calculations. It was concluded that the fluorescence properties of fluorescein derivatives are controlled by a photoinduced electron transfer (PET) process from the benzoic acid moiety to the xanthene ring and that the threshold of fluorescence OFF/ON switching lies around -8.9 eV for the HOMO level of the benzoic acid moiety. This information provides the basis for a practical strategy for rational design of functional fluorescence probes to detect certain biomolecules. We used this approach to design and synthesize 9-[2-(3-carboxy-9,10-dimethyl)anthryl]-6-hydroxy-3H-xanthen-3-one (DMAX) as a singlet oxygen probe and confirmed that it is the most sensitive probe currently known for (1)O(2). This novel fluorescence probe has a 9,10-dimethylanthracene moiety as an extremely fast chemical trap of (1)O(2). As was expected from PM3 calculations, DMAX scarcely fluoresces, while DMAX endoperoxide (DMAX-EP) is strongly fluorescent. Further, DMAX reacts with (1)O(2) more rapidly, and its sensitivity is 53-fold higher than that of 9-[2-(3-carboxy-9,10-diphenyl)anthryl]-6-hydroxy-3H-xanthen-3-ones (DPAXs), which are a series of fluorescence probes for singlet oxygen that we recently developed. DMAX should be useful as a fluorescence probe for detecting (1)O(2) in a variety of biological systems.
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Affiliation(s)
- K Tanaka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Alpha-Bazin B, Bazin H, Boissy L, Mathis G. Europium cryptate-tethered ribonucleotide for the labeling of RNA and its detection by time-resolved amplification of cryptate emission. Anal Biochem 2000; 286:17-25. [PMID: 11038268 DOI: 10.1006/abio.2000.4764] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
TRACE (time-resolved amplification of cryptate emission), also called HTRF for pharmaceutical applications, is a homogeneous time-resolved fluorescence technique well adapted for the study of molecular interactions. It is based on fluorescence resonance energy transfer (FRET) between europium trisbipyridine cryptate (TBPEu(3+)) as energy donor and cross-linked allophycocyanin, symbolized by XL665, as acceptor, leading to a long-lived FRET signal. TBPEu(3+)-labeled uridine triphosphate (UTP), referred to as K-11-UTP in the text, was obtained by coupling TBPEu(3+) moiety to a C-5 functionalized UTP analog. K-11-UTP can be directly incorporated in RNA strands during enzymatic synthesis. This was demonstrated in an in vitro transcription reaction promoted by T(7) RNA polymerase. The reaction was performed in the presence of K-11-UTP and biotin-labeled cytidine triphosphate (biotin-16-CTP) in admixture with natural ribonucleotides. After the addition of streptavidin-XL665 conjugate (SA-XL665), which binds on biotinylated cytidine residues, a long-lived FRET signal was obtained. This proved that both europium cryptate and biotin were incorporated into the same RNA strand and are close enough to generate a FRET signal. The study of this FRET detection assay format showed that such doubly labeled RNA can be easily detected even when a very low percentage of K-11-UTP is used (less than 1% of total UTP concentration). Europium-cryptate-labeled RNA can also be monitored using a homogeneous hybridization assay format involving a biotinylated probe. After the addition of SA-XL665, the FRET signal generated demonstrates the formation of RNA:DNA hybrids. Europium-cryptate-labeled nucleotide thus gives access to a new type of RNA nonisotopic labeling and homogeneous detection assays.
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Affiliation(s)
- B Alpha-Bazin
- Division of In Vitro Technologies, Cis Bio International, Bagnols sur Cèze Cédex, F-30204, France.
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Affiliation(s)
- Wei-Chuan Sun
- Molecular Probes, Inc., 4849 Pitchford Avenue, Eugene, Oregon 97402-9165
| | - Kyle R. Gee
- Molecular Probes, Inc., 4849 Pitchford Avenue, Eugene, Oregon 97402-9165
| | - Dieter H. Klaubert
- Molecular Probes, Inc., 4849 Pitchford Avenue, Eugene, Oregon 97402-9165
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Korshun VA, Prokhorenko IA, Gontarev SV, Skorobogatyi MV, Balakin KV, Manasova EV, Malakhov AD, Berlin YA. New Pyrene Derivatives for Fluorescent Labeling of Oligonucleotides. ACTA ACUST UNITED AC 1997. [DOI: 10.1080/07328319708006206] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Synthetic studies on tetrahydropyrroloquinoline-containing natural products: Syntheses of discorhabdin C, batzelline C and isobatzelline C. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85065-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Izawa T, Nishiyama S, Yamamura S. Total syntheses of makaluvamines A, B, C, D and E, cytotoxic pyrroloiminoquinone alkaloids isolated from marine sponge bearing inhibitory activities against topoisomerase II. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85674-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Izawa T, Nishiyama S, Yamamura S. Total syntheses of makaluvamines A, B, C and D, metabolites of the fijian sponge Zyzza cf. marsailis exhibiting inhibitory activities against topoisomerase II. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)75999-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kobayashi J, Ishibashi M. Chapter 2 Marine Alkaloids II. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/s0099-9598(08)60105-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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Synthetic studies on novel sulfur-containing alkaloids, prianosins and discorhabdins: total synthesis of discorhabdin C. Tetrahedron Lett 1991. [DOI: 10.1016/s0040-4039(00)79889-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kita Y, Tohma H, Inagaki M, Hatanaka K, Kikuchi K, Yakura T. Hypervalent iodine oxidation of O-silylated phenol derivatives to azacarbocyclic spirodienones; synthetic approach to the anticancer marine alkaloid, discorhabdin C. Tetrahedron Lett 1991. [DOI: 10.1016/s0040-4039(00)78901-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cheng JF, Nishiyama S, Yamamura S. Synthetic Studies on Novel Sulfur-Containing Alkaloids, Prianosins Isolated from the Marine SpongePrianos melanos. Synthesis of the Spirodienone Moiety by Phenolic Oxidation. CHEM LETT 1990. [DOI: 10.1246/cl.1990.1591] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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