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Abel AC, Mühlethaler T, Dessin C, Schachtsiek T, Sammet B, Sharpe T, Steinmetz MO, Sewald N, Prota AE. Bridging the maytansine and vinca sites: Cryptophycins target β-tubulin's T5-loop. J Biol Chem 2024; 300:107363. [PMID: 38735475 PMCID: PMC11190709 DOI: 10.1016/j.jbc.2024.107363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/02/2024] [Accepted: 05/04/2024] [Indexed: 05/14/2024] Open
Abstract
Cryptophycins are microtubule-targeting agents (MTAs) that belong to the most potent antimitotic compounds known to date; however, their exact molecular mechanism of action remains unclear. Here, we present the 2.2 Å resolution X-ray crystal structure of a potent cryptophycin derivative bound to the αβ-tubulin heterodimer. The structure addresses conformational issues present in a previous 3.3 Å resolution cryo-electron microscopy structure of cryptophycin-52 bound to the maytansine site of β-tubulin. It further provides atomic details on interactions of cryptophycins, which had not been described previously, including ones that are in line with structure-activity relationship studies. Interestingly, we discovered a second cryptophycin-binding site that involves the T5-loop of β-tubulin, a critical secondary structure element involved in the exchange of the guanosine nucleotide and in the formation of longitudinal tubulin contacts in microtubules. Cryptophycins are the first natural ligands found to bind to this new "βT5-loop site" that bridges the maytansine and vinca sites. Our results offer unique avenues to rationally design novel MTAs with the capacity to modulate T5-loop dynamics and to simultaneously engage multiple β-tubulin binding sites.
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Affiliation(s)
- Anne-Catherine Abel
- Laboratory of Biomolecular Research, Department of Biology and Chemistry, Paul Scherrer Institute, Villigen, Switzerland; Biozentrum, University of Basel, Basel, Switzerland
| | | | - Cedric Dessin
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Thomas Schachtsiek
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Benedikt Sammet
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | | | - Michel O Steinmetz
- Laboratory of Biomolecular Research, Department of Biology and Chemistry, Paul Scherrer Institute, Villigen, Switzerland; Biozentrum, University of Basel, Basel, Switzerland
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany.
| | - Andrea E Prota
- Laboratory of Biomolecular Research, Department of Biology and Chemistry, Paul Scherrer Institute, Villigen, Switzerland.
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Tafouo Tsakou A, Laure Ndontsa B, Carly Nono Nono E, Tseme Wandji N, Thierry Mbahbou Bitchagno G, Jules Kezetas Bankeu J, Azefack Tapondjou L, Sewald N, Ndjakou Lenta B. Elemane-Type Sesquiterpene, Acetonide Derived Polyacetylene and Other Constituents from the Whole Plant of Gymnanthemum theophrastifolium (Schweinf. ex Oliv. & Hiern) H.Rob. and Their Chemophenetic Significance. Chem Biodivers 2023; 20:e202200196. [PMID: 36879423 DOI: 10.1002/cbdv.202200196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 02/16/2023] [Indexed: 03/08/2023]
Abstract
The chemical investigation of the methanol extract of the whole plant of Gymnanthemum theophrastifolium (Schweinf. ex Oliv. & Hiern) H.Rob. (Asteraceae) led to the isolation of a new elemane-type sesquiterpene (1), a new acetonide derived polyacetylene (2) and a naturally occurring compound (3) from the plant kingdom along with sixteen known compounds (4-19). Their structures were elucidated by extensive NMR and MS analysis. This is the first report on the chemical constituents of G. theophrastifolium. Furthermore, compounds 12, 13, and 14 are reported for the first time from the family Asteraceae, while compound 9 is reported for the first time from the genus Gymnanthemum. Thus, the present results provide valuable insights to the chemophenetic knowledge of G. theophrastifolium, which is also discussed in this work.
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Affiliation(s)
- Armelle Tafouo Tsakou
- Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
| | - Blanche Laure Ndontsa
- Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
| | - Eric Carly Nono Nono
- Department of organic Chemistry, Faculty of science, University of Yaoundé, P. O. Box 812, Yaoundé, Cameroon
| | - Nadine Tseme Wandji
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P. O. Box 47, Yaoundé, Cameroon
| | - Gabin Thierry Mbahbou Bitchagno
- Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501, Bielefeld, Germany
| | - Jean Jules Kezetas Bankeu
- Department of Chemistry, Faculty of science, The University of Bamenda, P. O. Box 39, Bambili, Cameroon
| | - Leon Azefack Tapondjou
- Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
| | - Norbert Sewald
- Department of organic Chemistry, Faculty of science, University of Yaoundé, P. O. Box 812, Yaoundé, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P. O. Box 47, Yaoundé, Cameroon
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3
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Tchegnitegni Toussie B, Nguengang RT, Mawabo IK, Teponno RB, Kezetas Bankeu JJ, Chouna JR, Nkenfou CN, Tapondjou LA, Sewald N, Lenta BN. Bioactive Arylnaphthalide Lignans from Justicia depauperata. JOURNAL OF NATURAL PRODUCTS 2022; 85:2731-2739. [PMID: 36469853 DOI: 10.1021/acs.jnatprod.2c00624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Eleven previously undescribed arylnaphthalide lignans (1-11) together with seven known compounds were isolated from the whole plant of Justicia depauperata. The structures of 1-11 were elucidated by spectroscopic analysis and mass spectrometry. Compounds 6 (IC50 = 4.1 μM) and 9 (IC50 = 9.5 μM) displayed cytotoxic activity against the KB-3-1 cervical carcinoma cell line. This report provides an insight into the conformational equilibria occurring in the arylnaphthalide lignan constituents of this plant.
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Affiliation(s)
- Billy Tchegnitegni Toussie
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
- Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Bielefeld, D-33501 Bielefeld, Germany
| | - Ruland Tchuinkeu Nguengang
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Isabelle Kamga Mawabo
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Rémy Bertrand Teponno
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Jean Jules Kezetas Bankeu
- Department of Chemistry, Faculty of Science, The University of Bamenda, P.O. Box 39, Bambili, Cameroon
| | - Jean Rodolphe Chouna
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Celine Ngeufeu Nkenfou
- Department of Biology, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
| | - Léon Azefack Tapondjou
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Bielefeld, D-33501 Bielefeld, Germany
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
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4
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Soyauxinine, a New Indolopyridoquinazoline Alkaloid from the Stem Bark of Araliopsis soyauxii Engl. (Rutaceae). Molecules 2022; 27:molecules27031104. [PMID: 35164367 PMCID: PMC8838469 DOI: 10.3390/molecules27031104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 12/10/2022] Open
Abstract
The chemical investigation of the total alkaloid extract (TAE) of the stem bark of Araliopsis soyauxii (Rutaceae) afforded an unreported indolopyridoquinazoline (compound 1) along with nine previously known alkaloids 2–10. In addition, six semi-synthetic derivatives 3a–c, 4b, 5a and 6a were prepared by allylation and acetonidation of soyauxinium nitrate (5), edulinine (3), ribalinine (4) and arborinine (6). The structures and spectroscopic data of five of them are reported herein for the first time. The suggested mechanism for the formation of the new N-allylindolopyridoquinazoline 5a is presented. The structures of natural and derived compounds were determined employing extensive NMR and MS techniques. The absolute configuration of stereogenic centers in compounds 2–4 were determined using NOESY technique and confirmed by the single-crystal X-ray diffraction (SC-XRD) technique. The use of SC-XRD further enabled us to carry out a structural revision of soyauxinium chloride recently isolated from the same plant to soyauxinium nitrate (5). The TAE, fractions, compounds 1–7 and 9, and semi-synthetic derivatives 3a–c, 4b, 5a and 6a were evaluated for their cytotoxic activity towards the cervix carcinoma cell line KB-3-1. No significant activity was recorded for most of the compounds except for 9, which showed moderate activity against the tested cancer cell lines.
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5
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Zeutsop JF, Zébazé JN, Nono RN, Frese M, Chouna JR, Lenta BN, Nkeng-Efouet-Alango P, Sewald N. Antioxidant and cytotoxicity activities of δ-tocotrienol from the seeds of Allophylus africanus. Nat Prod Res 2021; 36:4661-4671. [PMID: 34852702 DOI: 10.1080/14786419.2021.2010195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Chemical investigation of Allophylus africanus P. Beauv fruits led to the isolation of a new δ-tocotrienol, 3α-hydroxy-δ-tocotrienol (1) together with eight known compounds (2-9). Compound (1) was allylated (1a) and prenylated (1 b and 1c) to give three new semi-synthesized derivatives which were fully characterized as: 6-O-allyl-3α-hydroxy-δ-tocotrienol (1a), 6-O-prenyl-3α-hydroxy-δ-tocotrienol (1 b) and 6-O,5-C-diprenyl-3α-hydroxy-δ-tocotrienol (1c). The structures of compounds were established using comprehensive spectroscopic analysis including UV, MS, 1 D NMR, 2 D NMR and by comparison with the corresponding literature data. Compound (1) and its semi-synthetic derivatives (1a-c) were tested for their antioxydant activity using DPPH radical scavenging assay and also for their cytotoxicity using human cervix carcinoma KB-3-1 cell lines. The results showed that compound (1) exhibited antioxidant activity with an IC50 value of 0.25 μM compared to the reference control trolox (26 µM); and good cytotoxic activity with IC50 values of 97 μM compared to the reference (+)-griseofulvin (IC50 between17-21 μM).
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Affiliation(s)
- Jean Francois Zeutsop
- Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
| | | | - Raymond Ngansop Nono
- Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Jean Rodolphe Chouna
- Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | | | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
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Seumo AS, Nanfack ARD, Ndontsa BL, Bitchagno GTM, Mbouangouere R, Lenta BN, Sewald N, Tane P, Tene M, Ngouela SA. Alkenylbenzoquinones and other compounds from the fruit of Maesa lanceolata exhibited potent cytotoxic, antibacterial, and antiradical scavenging activities §. Nat Prod Res 2021; 36:4379-4387. [PMID: 34694175 DOI: 10.1080/14786419.2021.1994565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A phytochemical study of the methanol extract of the fruit of Maesa lanceolata resulted in the isolation of a new alkenylbenzoquinone (1), alongside the known compounds (Z)-2,5-dihydroxy-6-methyl-3-(pentadec-10'-enyl)-1,4-benzoquinone (2), 2,5-dihydroxy-6-methyl-3-(nonadec-14'-enyl)-1,4-benzoquinone (3), 2,5-dihydroxy-6-methyl-3-(tridecyl)-1,4-benzoquinone (4), (2S,3S,4R,2'R,9E)-[2'-hydroxytetraeicosanoyl]-2-aminooctadec-9-ene-1,3,4-triol (5), monopalmitin (glyceryl palmitate) (6), lupeol (7), and 3-O-(β-D-glucopyranoside)-β-sitosterol (8). The structures of the compounds were established by the means of spectroscopic (1 D- and 2 D-NMR) and spectrometric techniques (MS). The isolated compounds were assessed for their antibacterial, cytotoxic, and antiradical activities. Compound 2 showed moderate activity against Staphylococcus warneri (DSMZ 20036), while the other compounds were inactive. The two quinones 1 and 2 were significantly cytotoxic, with IC50 values of 0.005 µM and 12.5 µM respectively, and were weakly active towards DPPH radical (IC50 >250 µg/mL).
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Affiliation(s)
- Amanda Seumo Seumo
- Faculty of Sciences, Department of Chemistry, University of Dschang, Cameroon
| | | | | | - Gabin Thierry M Bitchagno
- Faculty of Sciences, Department of Chemistry, University of Dschang, Cameroon.,Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | | | - Bruno N Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Pierre Tane
- Faculty of Sciences, Department of Chemistry, University of Dschang, Cameroon
| | - Mathieu Tene
- Faculty of Sciences, Department of Chemistry, University of Dschang, Cameroon
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7
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Mbougnia JF, Happi GM, Bitchagno GT, Awouafack MD, Lenta BN, Kouam SF, Tane P, Sewald N, Tene M. Chemical constituents from Ficus natalensis hochst (Moraceae) and their chemophenetic significance. BIOCHEM SYST ECOL 2021. [DOI: 10.1016/j.bse.2021.104227] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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8
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Nangue Djouatsa YN, Tékapi Tsopgni WD, Nguemfo EL, Kenou LB, Fouokeng Y, Djamen Mbeunkeu AB, Dongmo AB, Blaise Azebaze AG. Anthraquinones and other constituents from the roots of Eremomastax speciosa (Hochst.) Cufod. BIOCHEM SYST ECOL 2021. [DOI: 10.1016/j.bse.2020.104196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Cirillo M, Giacomini D. Molecular Delivery of Cytotoxic Agents via Integrin Activation. Cancers (Basel) 2021; 13:299. [PMID: 33467465 PMCID: PMC7830197 DOI: 10.3390/cancers13020299] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 12/16/2022] Open
Abstract
Integrins are cell adhesion receptors overexpressed in tumor cells. A direct inhibition of integrins was investigated, but the best inhibitors performed poorly in clinical trials. A gained attention towards these receptors arouse because they could be target for a selective transport of cytotoxic agents. Several active-targeting systems have been developed to use integrins as a selective cell entrance for some antitumor agents. The aim of this review paper is to report on the most recent results on covalent conjugates between integrin ligands and antitumor drugs. Cytotoxic drugs thus conjugated through specific linker to integrin ligands, mainly RGD peptides, demonstrated that the covalent conjugates were more selective against tumor cells and hopefully with fewer side effects than the free drugs.
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Affiliation(s)
| | - Daria Giacomini
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum University of Bologna, Via Selmi 2, 40126 Bologna, Italy;
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10
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Eliwa EM, Frese M, Halawa AH, Soltan MM, Ponomareva LV, Thorson JS, Shaaban KA, Shaaban M, El-Agrody AM, Sewald N. Metal-free domino amination-Knoevenagel condensation approach to access new coumarins as potent nanomolar inhibitors of VEGFR-2 and EGFR. GREEN CHEMISTRY LETTERS AND REVIEWS 2021; 14:578-599. [PMID: 35821884 PMCID: PMC9273165 DOI: 10.1080/17518253.2021.1981462] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A metal-free, atom-economy and simple work-up domino amination-Knoevenagel condensation approach to construct new coumarin analogous (4a-f and 8a-e) was described. Further, new formyl (5a,d-f) and nitro (9a,d-f) coumarin derivatives were synthesized via C-N coupling reaction of various cyclic secondary amines and 4-chloro-3-(formyl-/nitro)coumarins (1a,c), respectively. The confirmed compounds were screened for their in vitro anti-proliferative activity against KB-3-1, A549 and PC3 human cancer cell lines using resazurin cellular-based assay. Among them, coumarin derivatives 4e and 8e displayed the best anti-cervical cancer potency (KB-3-1) with IC50 values of 15.5 ± 3.54 and 21 ± 4.24 μM, respectively. Also, 4e showed the most promising cytotoxicity toward A549 with IC50 value of 12.94 ± 1.51 μM. As well, 9d presented a more significant impact of potency against PC3 with IC50 7.31 ± 0.48 μM. Moreover, 8d manifested selectivity against PC3 (IC50 = 20.16 ± 0.07 μM), while 8e was selective toward KB-3-1 cell line (IC50 = 21 ± 4.24 μM). Matching with docking profile, the enzymatic assay divulged that 8e is a dual potent single-digit nanomolar inhibitor of VEGFR-2 and EGFR with IC50 values of 24.67 nM and 31.6 nM that were almost equipotent to sorafenib (31.08 nM) and erlotinib (26.79 nM), respectively.
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Affiliation(s)
- Essam M. Eliwa
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Ahmed H. Halawa
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo, Egypt
| | - Maha M. Soltan
- Biology Unit, Central Laboratory for Pharmaceutical and Drug Industries Research Division, Chemistry of Medicinal Plants Department, Pharmaceutical and Drug Industries Research Division, National Research Centre Cairo, Egypt
| | - Larissa V. Ponomareva
- Center for Pharmaceutical Research and Innovation, University of Kentucky, Lexington, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, USA
| | - Jon S. Thorson
- Center for Pharmaceutical Research and Innovation, University of Kentucky, Lexington, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, USA
| | - Khaled A. Shaaban
- Center for Pharmaceutical Research and Innovation, University of Kentucky, Lexington, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, USA
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Cairo, Egypt
| | - Ahmed M. El-Agrody
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo, Egypt
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
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11
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Zeutsop JF, Nono RN, Frese M, Chouna JR, Lenta BN, Nkeng-Efouet-Alango P, Sewald N. Phytochemical, antibacterial, antioxidant and cytoxicity investigation of Tarenna grandiflora. ACTA ACUST UNITED AC 2020; 76:285-290. [PMID: 34218550 DOI: 10.1515/znc-2020-0187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 11/07/2020] [Indexed: 11/15/2022]
Abstract
The phytochemical investigation of Tarenna grandiflora led to the isolation of 18 known compounds of which were four flavones, three anthraquinones, one phenyl propanoic derivative, five triterpenoids, four steroids and a mixture of glucose. Luteolin (1) and soranjidiol (6) were allylated and/or prenylated to give four new semisynthesized derivatives which were fully characterized as 7,3',4'-O-triallylluteolin (1a), luteolin-7,3',4'-O-triprenyls (1b), luteolin-5,7,3',4'-O-tetraprenyls (1c) and 6-O-allylsoranjidiol (6a). Their structures were established using spectroscopic analysis including 1D, 2D NMR and MS data. The cytotoxic, antioxidant and antimicrobial activities of extracts, fractions, isolated compounds and semi-synthesized derivatives were evaluated. The petroleum ether and EtOAc extracts exhibited good cytotoxic potency on KB-3-1 cell line with IC50 of >0.1 and 0.025 mg/mL respectively, while compounds 1b and 11 were the most active (IC50 > 0.0001 M). Compounds 1 and 3 showed the best antioxidant activities (45.5 and 55.8 µM); while compounds 9 and 12 showed the best antibacterial activities with MICs values ranges from 8.55 to 132 µM.
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Affiliation(s)
- Jean Francois Zeutsop
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Raymond Ngansop Nono
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, P.O. Box 100131, 33501Bielefeld, Germany
| | - Jean Rodolphe Chouna
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
| | | | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, P.O. Box 100131, 33501Bielefeld, Germany
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12
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Mbougnia JFT, Bitchagno GTM, Wouamba SCN, Jouda JB, Awouafack MD, Tene M, Lenta BN, Kouam SF, Tane P, Sewald N. Two new triterpenoid fatty acid esters from Schefflera barteri Harms (Araliaceae)§. Nat Prod Res 2020; 36:2085-2096. [DOI: 10.1080/14786419.2020.1849199] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Judith Flore T. Mbougnia
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Gabin Thierry M. Bitchagno
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Steven Collins N. Wouamba
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Jean-Bosco Jouda
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
| | | | - Mathieu Tene
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Simeon Fogue Kouam
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Pierre Tane
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
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13
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El Euch IZ, El-Metwally MM, Frese M, Sewald N, Abdissa N, Shaaban M. Secondary metabolites from Penicillium sp. 8PKH isolated from deteriorated rice straws. ACTA ACUST UNITED AC 2019; 74:283-288. [PMID: 31246580 DOI: 10.1515/znc-2019-0010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 06/04/2019] [Indexed: 11/15/2022]
Abstract
In the search for bioactive secondary metabolites from terrestrial fungi, four compounds, namely, 3-methyl-3H-quinazolin-4-one (1), aurantiomide C (2), 3-O-methylviridicatin (3), and dehydrocyclopeptine (4), were isolated from Penicillium sp. 8PKH, fungal strain, isolated from deteriorated rice straws. The structures of the isolated compounds were identified by extensive NMR and mass analyses and comparison with literature data. This is the first report of the structure of 3-methyl-3H-quinazolin-4-one (1) with full NMR spectral data having been previously identified by GC-MS from Piper beetle. Analysis of the non-polar fractions of the strain extract by GC-MS revealed the presence of additional eight compounds: methyl-hexadecanoate, methyl linoleate, methyl-9 (Z)-octadecenoate, methyl-octadecanoate, cis-9-oxabicyclo (6.1.0) nonane, 9,12-octadecadienal (9E,12E), ethyl-(E)-9-octadecenoate, and 3-buten-2-ol. The isolated compounds were evaluated for their antimicrobial and cytotoxic activities and exhibited little or no inhibitory activities against the test strains. The taxonomical characterisation and fermentation of the fungal strain were reported as well.
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Affiliation(s)
- Imene Z El Euch
- Organic and Bioorganic Chemistry, Department of Chemistry, University of Bielefeld, University Str. 25, 33615 Bielefeld, Germany
| | - Mohammad M El-Metwally
- Botany and Microbiology Department, Faculty of Science, Damanhour University, Damanhour, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, University of Bielefeld, University Str. 25, 33615 Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, University of Bielefeld, University Str. 25, 33615 Bielefeld, Germany
| | - Negera Abdissa
- Department of Chemistry, Jimma University, Jimma, Ethiopia
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Department of Chemistry, University of Bielefeld, University Str. 25, 33615 Bielefeld, Germany.,Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, El-Behoosst., Dokki-Cairo 12622, Egypt, Phone: +202-3371483-2609, Fax: +202-3370931
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14
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Hamed A, Ismail M, El-Metwally MM, Frese M, Ibrahim TMA, El-Haddad AF, Sewald N, Shaaban M. Diverse polyketides and alkaloids from Penicillium sp. KHMM: structural elucidation, biological and molecular docking studies. ACTA ACUST UNITED AC 2019; 74:131-137. [PMID: 30645191 DOI: 10.1515/znc-2018-0145] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 12/15/2018] [Indexed: 11/15/2022]
Abstract
As a continuation of our earlier research concerning the investigation of microbial bioactive secondary metabolites from the terrestrial Penicillium sp.KH Link 1809 isolate KHMM, the fungus was re-cultivated on a large scale to explore its bioactive compounds intensively. Fifteen compounds, including seven alkaloids (1-7), one sesquiterpene (8), an acetylenic system (9), two sterols, and sphengolipid, were identified. Their structures were established on the bases of extensive one- and two-dimensional nuclear magnetic resonance and mass measurements, and by comparison with literature data. The antimicrobial activity of the fungal extract and the corresponding compounds were studied using a panel of pathogenic microorganisms, and their in vitro cytotoxicity against the human cervix carcinoma cell line (KB-3-1) was reported as well. The molecular docking of the isolated compounds showed promising affinities for the alkaloidal compounds 4-6 towards α, β tubulins.
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Affiliation(s)
- Abdelaaty Hamed
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany.,Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Mohamed Ismail
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany.,Microbiology Department, Faculty of Science, Helwan University, Helwan-Cairo, Egypt
| | - Mohammad M El-Metwally
- Botany and Microbiology Department, Faculty of Science, Damanhour University, Damanhour, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Tarek M A Ibrahim
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Atef F El-Haddad
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany.,Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, El-Behoos St. 33, Dokki-Cairo 12622, Egypt
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15
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Hamed A, Abdel-Razek AS, Frese M, Wibberg D, El-Haddad AF, Ibrahim TMA, Kalinowski J, Sewald N, Shaaban M. N-Acetylborrelidin B: a new bioactive metabolite from Streptomyces mutabilis sp. MII. ACTA ACUST UNITED AC 2019; 73:49-57. [PMID: 29055178 DOI: 10.1515/znc-2017-0140] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 09/22/2017] [Indexed: 11/15/2022]
Abstract
In the course of our screening program for new bioactive compounds, a naturally new 18-membered macrolide antibiotic, N-acetylborrelidin B (1) along with borrelidin (2) were obtained from the marine Streptomyces mutabilis sp. MII. The strain was isolated from a sediment sample collected in the Red Sea at the Hurghada Coast and characterized taxonomically. Additional nine diverse bioactive compounds were reported: 6-prenyl-indole-3-acetonitrile (3), sitosteryl-3β-d-glucoside, campesterol, ferulic acid, linoleic acid methyl ester, linoleic acid, N-acetylanthranilic acid, indole 3-acetic acid methyl ester, indole 3-carboxylic acid, and adenosine. Structure 1 was confirmed by in-depth NMR studies and by mass spectra, and comparison with related literature data. The antimicrobial activity of the strain extract and compounds 1 and 2 were studied using a panel of pathogenic microorganisms. The in vitro cytotoxicity of compounds 1 and 2 as well as the crude extract were tested against the human cervix carcinoma cell line (KB-3-1).
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Affiliation(s)
- Abdelaaty Hamed
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Ahmed S Abdel-Razek
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Daniel Wibberg
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, Universitätsstraße 27, D-33615 Bielefeld, Germany
| | - Atef F El-Haddad
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
| | - Tarek M A Ibrahim
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
| | - Jörn Kalinowski
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, Universitätsstraße 27, D-33615 Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33501 Bielefeld, Germany
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16
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Borbély A, Figueras E, Martins A, Bodero L, Raposo Moreira Dias A, López Rivas P, Pina A, Arosio D, Gallinari P, Frese M, Steinkühler C, Gennari C, Piarulli U, Sewald N. Conjugates of Cryptophycin and RGD or isoDGR Peptidomimetics for Targeted Drug Delivery. ChemistryOpen 2019; 8:737-742. [PMID: 31275795 PMCID: PMC6587324 DOI: 10.1002/open.201900110] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 04/16/2019] [Indexed: 12/28/2022] Open
Abstract
RGD-cryptophycin and isoDGR-cryptophycin conjugates were synthetized by combining peptidomimetic integrin ligands and cryptophycin, a highly potent tubulin-binding antimitotic agent across lysosomally cleavable Val-Ala or uncleavable linkers. The conjugates were able to effectively inhibit binding of biotinylated vitronectin to integrin αvβ3, showing a binding affinity in the same range as that of the free ligands. The antiproliferative activity of the novel conjugates was evaluated on human melanoma cells M21 and M21-L with different expression levels of integrin αvβ3, showing nanomolar potency of all four compounds against both cell lines. Conjugates containing uncleavable linker show reduced activity compared to the corresponding cleavable conjugates, indicating efficient intracellular drug release in the case of cryptophycin-based SMDCs. However, no significant correlation between the in vitro biological activity of the conjugates and the integrin αvβ3 expression level was observed, which is presumably due to a non-integrin-mediated uptake. This reveals the complexity of effective and selective αvβ3 integrin-mediated drug delivery.
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Affiliation(s)
- Adina Borbély
- Organic and Bioorganic Chemistry, Department of ChemistryBielefeld UniversityUniversitätsstraße 25DE-33615BielefeldGermany
| | - Eduard Figueras
- Organic and Bioorganic Chemistry, Department of ChemistryBielefeld UniversityUniversitätsstraße 25DE-33615BielefeldGermany
| | - Ana Martins
- Organic and Bioorganic Chemistry, Department of ChemistryBielefeld UniversityUniversitätsstraße 25DE-33615BielefeldGermany
- Exiris s.r.l.Via di Castel Romano 100IT-00128RomeItaly
| | - Lizeth Bodero
- Dipartimento di Scienza e Alta TecnologiaUniversità degli Studi dell'InsubriaVia Valleggio, 11IT-22100ComoItaly
| | | | - Paula López Rivas
- Dipartimento di ChimicaUniversità degli Studi di MilanoVia C. Golgi, 19IT-20133MilanoItaly
| | - Arianna Pina
- Dipartimento di ChimicaUniversità degli Studi di MilanoVia C. Golgi, 19IT-20133MilanoItaly
| | - Daniela Arosio
- Istituto di Scienze e Tecnologie Molecolari (ISTM)CNRVia C. Golgi, 19IT-20133MilanoItaly
| | | | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of ChemistryBielefeld UniversityUniversitätsstraße 25DE-33615BielefeldGermany
| | | | - Cesare Gennari
- Dipartimento di ChimicaUniversità degli Studi di MilanoVia C. Golgi, 19IT-20133MilanoItaly
| | - Umberto Piarulli
- Dipartimento di Scienza e Alta TecnologiaUniversità degli Studi dell'InsubriaVia Valleggio, 11IT-22100ComoItaly
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of ChemistryBielefeld UniversityUniversitätsstraße 25DE-33615BielefeldGermany
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17
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Octreotide Conjugates for Tumor Targeting and Imaging. Pharmaceutics 2019; 11:pharmaceutics11050220. [PMID: 31067748 PMCID: PMC6571972 DOI: 10.3390/pharmaceutics11050220] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 05/02/2019] [Accepted: 05/03/2019] [Indexed: 12/11/2022] Open
Abstract
Tumor targeting has emerged as an advantageous approach to improving the efficacy and safety of cytotoxic agents or radiolabeled ligands that do not preferentially accumulate in the tumor tissue. The somatostatin receptors (SSTRs) belong to the G-protein-coupled receptor superfamily and they are overexpressed in many neuroendocrine tumors (NETs). SSTRs can be efficiently targeted with octreotide, a cyclic octapeptide that is derived from native somatostatin. The conjugation of cargoes to octreotide represents an attractive approach for effective tumor targeting. In this study, we conjugated octreotide to cryptophycin, which is a highly cytotoxic depsipeptide, through the protease cleavable Val-Cit dipeptide linker using two different self-immolative moieties. The biological activity was investigated in vitro and the self-immolative part largely influenced the stability of the conjugates. Replacement of cryptophycin by the infrared cyanine dye Cy5.5 was exploited to elucidate the tumor targeting properties of the conjugates in vitro and in vivo. The compound efficiently and selectively internalized in cells overexpressing SSTR2 and accumulated in xenografts for a prolonged time. Our results on the in vivo properties indicate that octreotide may serve as an efficient delivery vehicle for tumor targeting.
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18
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Borbély A, Figueras E, Martins A, Esposito S, Auciello G, Monteagudo E, Di Marco A, Summa V, Cordella P, Perego R, Kemker I, Frese M, Gallinari P, Steinkühler C, Sewald N. Synthesis and Biological Evaluation of RGD⁻Cryptophycin Conjugates for Targeted Drug Delivery. Pharmaceutics 2019; 11:E151. [PMID: 30939768 PMCID: PMC6523311 DOI: 10.3390/pharmaceutics11040151] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/19/2019] [Accepted: 03/25/2019] [Indexed: 01/08/2023] Open
Abstract
Cryptophycins are potent tubulin polymerization inhibitors with picomolar antiproliferative potency in vitro and activity against multidrug-resistant (MDR) cancer cells. Because of neurotoxic side effects and limited efficacy in vivo, cryptophycin-52 failed as a clinical candidate in cancer treatment. However, this class of compounds has emerged as attractive payloads for tumor-targeting applications. In this study, cryptophycin was conjugated to the cyclopeptide c(RGDfK), targeting integrin αvβ₃, across the protease-cleavable Val-Cit linker and two different self-immolative spacers. Plasma metabolic stability studies in vitro showed that our selected payload displays an improved stability compared to the parent compound, while the stability of the conjugates is strongly influenced by the self-immolative moiety. Cathepsin B cleavage assays revealed that modifications in the linker lead to different drug release profiles. Antiproliferative effects of Arg-Gly-Asp (RGD)⁻cryptophycin conjugates were evaluated on M21 and M21-L human melanoma cell lines. The low nanomolar in vitro activity of the novel conjugates was associated with inferior selectivity for cell lines with different integrin αvβ₃ expression levels. To elucidate the drug delivery process, cryptophycin was replaced by an infrared dye and the obtained conjugates were studied by confocal microscopy.
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Affiliation(s)
- Adina Borbély
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
| | - Eduard Figueras
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
| | - Ana Martins
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
- Exiris s.r.l., Via di Castel Romano 100, IT-00128 Rome, Italy.
| | - Simone Esposito
- IRBM S.p.A, Via Pontina km. 30,600, IT-00071 Pomezia (Rome), Italy.
| | - Giulio Auciello
- IRBM S.p.A, Via Pontina km. 30,600, IT-00071 Pomezia (Rome), Italy.
| | - Edith Monteagudo
- IRBM S.p.A, Via Pontina km. 30,600, IT-00071 Pomezia (Rome), Italy.
| | | | - Vincenzo Summa
- IRBM S.p.A, Via Pontina km. 30,600, IT-00071 Pomezia (Rome), Italy.
| | - Paola Cordella
- Italfarmaco S.p.A., Via dei Lavoratori, 54, IT-20092 Cinisello Balsamo (Milano), Italy.
| | - Raffaella Perego
- Italfarmaco S.p.A., Via dei Lavoratori, 54, IT-20092 Cinisello Balsamo (Milano), Italy.
| | - Isabell Kemker
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
| | - Paola Gallinari
- Exiris s.r.l., Via di Castel Romano 100, IT-00128 Rome, Italy.
| | - Christian Steinkühler
- Exiris s.r.l., Via di Castel Romano 100, IT-00128 Rome, Italy.
- Italfarmaco S.p.A., Via dei Lavoratori, 54, IT-20092 Cinisello Balsamo (Milano), Italy.
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, DE-33615 Bielefeld, Germany.
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19
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Cazzamalli S, Figueras E, Pethő L, Borbély A, Steinkühler C, Neri D, Sewald N. In Vivo Antitumor Activity of a Novel Acetazolamide-Cryptophycin Conjugate for the Treatment of Renal Cell Carcinomas. ACS OMEGA 2018; 3:14726-14731. [PMID: 30533574 PMCID: PMC6276201 DOI: 10.1021/acsomega.8b02350] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 10/25/2018] [Indexed: 06/09/2023]
Abstract
Traditional chemotherapeutics used in cancer therapy do not preferentially accumulate in tumor tissues. The conjugation to delivery vehicles like antibodies or small molecules has been proposed as a strategy to increase the tumor uptake and improve the therapeutic window of these drugs. Here, we report the synthesis and the biological evaluation of a novel small molecule-drug conjugate (SMDC) comprising a high-affinity bidentate acetazolamide derivative, targeting carbonic anhydrase IX (CAIX), and cryptophycin, a potent microtubule destabilizer. The biological activity of the novel SMDC was evaluated in vitro, measuring binding to the CAIX antigen by surface plasmon resonance and cytotoxicity against SKRC-52 cells. In vivo studies showed a delayed growth of tumors in nude mice bearing SKRC-52 renal cell carcinomas.
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Affiliation(s)
- Samuele Cazzamalli
- Department
of Chemistry and Applied Biosciences, Swiss
Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland
| | - Eduard Figueras
- Department
of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Lilla Pethő
- Department
of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany
- MTA-ELTE
Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös L. University, H-1117 Budapest, Hungary
| | - Adina Borbély
- Department
of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | | | - Dario Neri
- Department
of Chemistry and Applied Biosciences, Swiss
Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland
| | - Norbert Sewald
- Department
of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany
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20
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Abdel-Razek AS, Hamed A, Frese M, Sewald N, Shaaban M. Penicisteroid C: New polyoxygenated steroid produced by co-culturing of Streptomyces piomogenus with Aspergillus niger. Steroids 2018; 138:21-25. [PMID: 29902496 DOI: 10.1016/j.steroids.2018.06.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 10/28/2022]
Abstract
Penicisteroid C, a new polyoxygenated steroid was isolated from co-cultivation of Streptomyces piomogenus AS63D and Aspergillus niger using solid-state fermentation on rice medium. Additional diverse eleven known metabolites were identified: Fumigaclavine C, fumiquinazoline C, physcion, methylsulochrin, methyllinoleate, glycerol linoleate, cerebroside A, thymine, adenine, thymidine and adenosine. The structure of penicisteroid C was determined by HRESIMS, 1D and 2D NMR data. The antimicrobial and in vitro cytotoxic activities of the microbial extract and penicisteroid C were reported as well.
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Affiliation(s)
- Ahmed S Abdel-Razek
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany; Microbial Chemistry Department, Genetic Engineering and Biotechnology Research Division, National Research Centre, El-Buhouth St. 33, Dokki, Cairo 12622, Egypt
| | - Abdelaaty Hamed
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany; Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany; Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, El-Buhouth St. 33, Dokki, Cairo 12622, Egypt.
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21
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Figueras E, Borbély A, Ismail M, Frese M, Sewald N. Novel unit B cryptophycin analogues as payloads for targeted therapy. Beilstein J Org Chem 2018; 14:1281-1286. [PMID: 29977395 PMCID: PMC6009196 DOI: 10.3762/bjoc.14.109] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 05/02/2018] [Indexed: 12/21/2022] Open
Abstract
Cryptophycins are naturally occurring cytotoxins with great potential for chemotherapy. Since targeted therapy provides new perspectives for treatment of cancer, new potent analogues of cytotoxic agents containing functional groups for conjugation to homing devices are required. We describe the design, synthesis and biological evaluation of three new unit B cryptophycin analogues. The O-methyl group of the unit B D-tyrosine analogue was replaced by an O-(allyloxyethyl) moiety, an O-(hydroxyethyl) group, or an O-(((azidoethoxy)ethoxy)ethoyxethyl) substituent. While the former two maintain cytotoxicity in the subnanomolar range, the attachment of the triethylene glycol spacer with a terminal azide results in a complete loss of activity. Docking studies of the novel cryptophycin analogues to β-tubulin provided a rationale for the observed cytotoxicities.
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Affiliation(s)
- Eduard Figueras
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Adina Borbély
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Mohamed Ismail
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Marcel Frese
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
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22
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Szloszár A, Mándity IM, Fülöp F. Sustainable synthesis of N-methylated peptides in a continuous-flow fixed bed reactor. J Flow Chem 2018. [DOI: 10.1007/s41981-018-0002-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Shaaban M, Ali M, Tala MF, Hamed A, Hassan AZ. Ecological and Phytochemical Studies on Euphorbia retusa (Forssk.) from Egyptian Habitat. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2018; 2018:9143683. [PMID: 29484217 PMCID: PMC5816848 DOI: 10.1155/2018/9143683] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 10/28/2017] [Accepted: 11/13/2017] [Indexed: 06/08/2023]
Abstract
This study deals with the ecology, phytochemistry, and biological activity investigation of Euphorbia retusa, belonging to Euphorbiaceae family, obtained from Egypt. Ecologically, Euphorbia retusa secretes white sap inhibiting the growth of the other species, so Euphorbia retusa is forming complete patches. Phytochemical study of the plant was visualized intensively based on its extraction with a protic organic solvent, working up and purifying its entire bioactive compounds using a series of different chromatographic techniques. A broad range of diverse compounds were isolated, namely, 1-hexacosanol (1), 3β-hydroxy-24-methylene-9,19-cyclolanostane; 24-methylenecycloartanol (2), 3β-hydroxy-9,19-cyclolanostane; cyclolaudanol (3), 3β,24S-Ergost-5-en-ol (4), and methyllinoleate. Additionally, GC-MS analysis of the unpolar fractions detected the existence of n-dodecane, methyllaurate, 6,10,14-trimethyl-pentadecan-2-one (5), 6,10-dimethyl-undecan-2-one (6), 2-methyl-hexadecanal (7), methylpalmitate, methyl-9,12,15-octadecatrienoate (8), and n-heneicosane (9). A full assignment for compounds 2 and 3 using 1 and 2 DNMR was carried out herein for the first time. The antimicrobial activity of the strain extract and obtained compounds was studied using a panel of pathogenic bacterial strains. The in vitro cytotoxicity of the compounds as well as the crude extract was studied against the human cervix carcinoma cell line (KB-3-1).
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Affiliation(s)
- Mohamed Shaaban
- Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries, National Research Centre, El-Behoos St. 33, Dokki, Cairo 12622, Egypt
- Department of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Mahmoud Ali
- Plant Ecology and Range Management Department, Desert Research Centre, Cairo, Egypt
| | - Michel Feussi Tala
- Department of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Abdelaaty Hamed
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33501 Bielefeld, Germany
| | - Amal Zaki Hassan
- Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries, National Research Centre, El-Behoos St. 33, Dokki, Cairo 12622, Egypt
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Structure-Activity Relationship of Propargylamine-Based HDAC Inhibitors. ChemMedChem 2017; 12:2044-2053. [DOI: 10.1002/cmdc.201700550] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/05/2017] [Indexed: 11/07/2022]
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Synthesis of diverse amide linked bis-indoles and indole derivatives bearing coumarin-based moiety: cytotoxicity and molecular docking investigations. Med Chem Res 2017. [DOI: 10.1007/s00044-017-2103-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Abdissa N, Frese M, Sewald N. Antimicrobial Abietane-Type Diterpenoids from Plectranthus punctatus. Molecules 2017; 22:molecules22111919. [PMID: 29112171 PMCID: PMC6150224 DOI: 10.3390/molecules22111919] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 11/02/2017] [Accepted: 11/03/2017] [Indexed: 01/08/2023] Open
Abstract
Four new para-benzoquinone containing abietane-type diterpenoids (1–4) along with thirteen known diterpenoids (5–17) were isolated from the roots of Plectranthus punctatus. The structures of the compounds were established by detailed spectroscopic analyses and comparison with literature data. The compounds were tested for their antibacterial and cytotoxic activity and showed significant inhibitory activity against all bacterial strains used, with compounds 6, 8, 10, and 11 showing an inhibition zone for Staphylococcus warneri even greater than the reference drug, gentamycin.
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Affiliation(s)
- Negera Abdissa
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, Bielefeld 33501, Germany.
- Department of Chemistry, College of Natural Sciences, Jimma University, P.O. Box 378, Jimma 251, Ethiopia.
| | - Marcel Frese
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, Bielefeld 33501, Germany.
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, Bielefeld 33501, Germany.
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Halawa AH, El-Gilil SMA, Bedair AH, Shaaban M, Frese M, Sewald N, Eliwa EM, El-Agrody AM. Synthesis, biological activity and molecular modeling study of new Schiff bases incorporated with indole moiety. ACTA ACUST UNITED AC 2017; 72:467-475. [PMID: 28525356 DOI: 10.1515/znc-2017-0025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 04/25/2017] [Indexed: 11/15/2022]
Abstract
A new series of heterocyclic Schiff bases 2-9 containing indole moiety were synthesized by facile and efficient condensation of indole-3/2/5-carboxaldehyde (1a/1b/1c) with different aromatic and heterocyclic primary amines using conventional and/or microwave irradiation methods. The structures of the obtained compounds were assigned by sophisticated spectroscopic and spectrometric techniques (1D-NMR, 2D-NMR and MS). The synthesized compounds were screened for their cytotoxicity and antibacterial activities. In vitro cytotoxicity screening revealed that compound 5 exhibited moderate activity against KB-3-1 cell line (IC50=57.7 μM) while 5-indolylimino derivative 7 indicated close to the activity (IC50=19.6 μM) in comparison with the positive control (+)-Griseofulvin (IC50=19.2 μM), while the tested compounds 5, 6b, 7 and 9 revealed good or moderate antibacterial activity. In addition, molecular docking study of Schiff bases 2-9 was performed by Molecular Operating Environment (MOE 2014.09) program on the matrix metalloproteinase-8 (MMP-8) (Protein Data Bank (PDB) ID: 1MNC) in an attempt to explore their mode of action as anticancer drugs.
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Facile access to pseudo-thio-1,2-dimannoside, a new glycomimetic DC-SIGN antagonist. Bioorg Med Chem 2017; 25:5142-5147. [DOI: 10.1016/j.bmc.2017.03.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 03/20/2017] [Accepted: 03/21/2017] [Indexed: 01/16/2023]
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Halawa AH, Bedair AH, El-Agrody AM, Eliwa EM, Frese M, Sewald N, Shaaban M. Synthesis and biological activities of new bis-indole derivatives via microwave irradiation. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2017. [DOI: 10.1515/znb-2017-0039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Abstract
Three new series of bis-indole derivatives were synthesized based on p-phenylenediamine (2–4, 5 and 6) and 4,4′-ethylenedianiline moieties (7–9) using facile and efficient condensation of three positional isomeric indole-carboxaldehyde derivatives (1a–c) with bifunctional amines upon microwave irradiation. The symmetric dimeric indole derivatives 2–4 as well as non-symmetric analogues 5 and 6 were obtained by in situ condensation of the respective positional 3-, 2- and 5-isomeric indole-carboxaldehydes with p-phenylenediamine, while compounds 7–9 resulted from respective condensation based on 4,4′-ethylenedianiline. Structures of the obtained compounds were deduced by advanced spectroscopic methods (1H NMR, 13C NMR and MS). In agar diffusion assay, derivative 6 showed moderate antibacterial activity against various Gram positive and negative bacteria, while derivative 7 displayed moderate activity against several Gram positive bacteria. However, in Resazurin assay employing the human cervix carcinoma cell line (KB-3-1), derivatives 2–9 turned out to be inactive.
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Affiliation(s)
- Ahmed H. Halawa
- Chemistry Department , Faculty of Science , Al-Azhar University , 11884 Nasr City, Cairo , Egypt
| | - Ahmed H. Bedair
- Chemistry Department , Faculty of Science , Al-Azhar University , 11884 Nasr City, Cairo , Egypt
| | - Ahmed M. El-Agrody
- Chemistry Department , Faculty of Science , Al-Azhar University , 11884 Nasr City, Cairo , Egypt
| | - Essam M. Eliwa
- Chemistry Department , Faculty of Science , Al-Azhar University , 11884 Nasr City, Cairo , Egypt
- Organic and Bioorganic Chemistry, Faculty of Chemistry , Bielefeld University , D-33501 Bielefeld , Germany
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Faculty of Chemistry , Bielefeld University , D-33501 Bielefeld , Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry , Bielefeld University , D-33501 Bielefeld , Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Faculty of Chemistry , Bielefeld University , D-33501 Bielefeld , Germany
- Chemistry of Natural Compounds Department , Division of Pharmaceutical Industries, National Research Centre , Dokki-Cairo 12622 , Egypt
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Tubulin Inhibitor-Based Antibody-Drug Conjugates for Cancer Therapy. Molecules 2017; 22:molecules22081281. [PMID: 28763044 PMCID: PMC6152078 DOI: 10.3390/molecules22081281] [Citation(s) in RCA: 124] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 07/29/2017] [Indexed: 11/16/2022] Open
Abstract
Antibody-drug conjugates (ADCs) are a class of highly potent biopharmaceutical drugs generated by conjugating cytotoxic drugs with specific monoclonal antibodies through appropriate linkers. Specific antibodies used to guide potent warheads to tumor tissues can effectively reduce undesired side effects of the cytotoxic drugs. An in-depth understanding of antibodies, linkers, conjugation strategies, cytotoxic drugs, and their molecular targets has led to the successful development of several approved ADCs. These ADCs are powerful therapeutics for cancer treatment, enabling wider therapeutic windows, improved pharmacokinetic/pharmacodynamic properties, and enhanced efficacy. Since tubulin inhibitors are one of the most successful cytotoxic drugs in the ADC armamentarium, this review focuses on the progress in tubulin inhibitor-based ADCs, as well as lessons learned from the unsuccessful ADCs containing tubulin inhibitors. This review should be helpful to facilitate future development of new generations of tubulin inhibitor-based ADCs for cancer therapy.
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Abdissa N, Gohlke S, Frese M, Sewald N. Cytotoxic Compounds from Aloe megalacantha. Molecules 2017; 22:E1136. [PMID: 28686200 PMCID: PMC6152336 DOI: 10.3390/molecules22071136] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 06/27/2017] [Accepted: 07/03/2017] [Indexed: 11/17/2022] Open
Abstract
Phytochemical investigation of the ethyl acetate extract of the roots of Aloe megalacantha led to the isolation of four new natural products-1,8-dimethoxynepodinol (1), aloesaponarin III (2), 10-O-methylchrysalodin (3) and methyl-26-O-feruloyl-oxyhexacosanate (4)-along with ten known compounds. All purified metabolites were characterized by NMR, mass spectrometric analyses and comparison with literature data. The isolates were evaluated for their cytotoxic activity against a human cervix carcinoma cell line KB-3-1 and some of them exhibited good activity, with aloesaponarin II (IC50 = 0.98 µM) being the most active compound.
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Affiliation(s)
- Negera Abdissa
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany.
- Department of Chemistry, College of Natural Sciences, Jimma University, P.O. Box 378, 251 Jimma, Ethiopia.
| | - Sebastian Gohlke
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany.
| | - Marcel Frese
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany.
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany.
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Weiss C, Figueras E, Borbely AN, Sewald N. Cryptophycins: cytotoxic cyclodepsipeptides with potential for tumor targeting. J Pept Sci 2017; 23:514-531. [PMID: 28661555 DOI: 10.1002/psc.3015] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/02/2017] [Accepted: 05/05/2017] [Indexed: 02/06/2023]
Abstract
Cryptophycins are a class of 16-membered highly cytotoxic macrocyclic depsipeptides isolated from cyanobacteria. The biological activity is based on their ability to interact with tubulin. They interfere with microtubule dynamics and prevent microtubules from forming correct mitotic spindles, which causes cell-cycle arrest and apoptosis. Their strong antiproliferative activities with 100-fold to 1000-fold potency compared with those of paclitaxel and vinblastine have been observed. Cryptophycins are highly promising drug candidates, as their biological activity is not negatively affected by P-glycoprotein, a drug efflux system commonly found in multidrug-resistant cancer cell lines and solid tumors. Cryptophycin-52 had been investigated in phase II clinical trials but failed because of its high neurotoxicity. Recently, cryptophycin conjugates with peptides and antibodies have been developed for targeted delivery in tumor therapy. Copyright © 2017 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Christine Weiss
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Eduard Figueras
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Adina N Borbely
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501, Bielefeld, Germany
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33
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Eliwa EM, Abdel-Razek AS, Frese M, Wibberg D, Halawa AH, El-Agrody AM, Bedair AH, Kalinowski J, Sewald N, Shaaban M. New bioactive compounds from the marine-derived actinomycete Nocardiopsis lucentensis sp. ASMR2. ACTA ACUST UNITED AC 2017. [DOI: 10.1515/znb-2016-0250] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In the search for new bioactive compounds from extremophilic actinomycetes, a new marine actinomycete strain, Nocardiopsis lucentensis sp. ASMR2 has been isolated and taxonomically identified from marine plants collected in the Red Sea at Hurghada coasts. A large-scale fermentation of the strain on modified rice solid medium was performed, followed by work-up and purification of the obtained extract using a series of chromatographic purifications, delivering the novel butenolide system 3′-hydroxy-N-(2-oxo-2,5-dihydrofuran-4-yl)propionamide (1a) along with the naturally new 4-methoxy-2H-isoquinolin-1-one (2). Furthermore, eight known bioactive compounds are also reported, namely, indole-3-carboxylic acid, indole-3-acetic acid, indole-3-acetic acid methyl ester, furan-2,5-dimethanol, tyrosol, glycerol linoleate, cyclo-(Tyr, Pro), and adenosine. The chemical structures of the new compounds (1a, 2) were confirmed by extensive one- and two-dimensional (1D and 2D) nuclear magnetic resonance (NMR) spectroscopy, electron ionization high resolution (EI-HR) mass spectrometry, and by comparison with literature data. The antimicrobial activity of the strain extract, as well as of compounds 1a and 2, were studied using a panel of pathogenic microorganisms. The in vitro cytotoxicity of the bacterial extract and compounds 1a and 2 were studied against the human cervix carcinoma cell line (KB-3-1) and its multidrug-resistant subclone (KB-V1).
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Affiliation(s)
- Essam M. Eliwa
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Ahmed S. Abdel-Razek
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Microbial Chemistry Department, Division of Genetic Engineering and Biotechnology Research, National Research Centre, El-Behoos St. 33, Dokki-Cairo 12622, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Daniel Wibberg
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, Universitätsstraße 27, D-33615 Bielefeld, Germany
| | - Ahmed H. Halawa
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Ahmed M. El-Agrody
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Ahmed H. Bedair
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Jörn Kalinowski
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, Universitätsstraße 27, D-33615 Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries, National Research Centre, El-Behoos St. 33, Dokki, Cairo 12622, Egypt , Tel.: +202-270-1728/int-2609. Fax: +202-333-70931
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Hamed A, Abdel-Razek AS, Frese M, Wibberg D, El-Haddad AF, Ibrahim TMA, Kalinowski J, Sewald N, Shaaban M. New oxaphenalene derivative from marine-derived Streptomyces griseorubens sp. ASMR4. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/znb-2016-0145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
During our search for novel bioactive compounds from extremophilic actinomycetes, the new Streptomyces griseorubens sp. ASMR4 was isolated from a soft coral collected in the Red Sea at the Hurghada coast, Egypt, and characterized taxonomically. It was fermented on large scale using a modified solid rice medium as the first example for actinomycetes so far. Work-up and purification of the strain extract using different chromatographic techniques afforded the new oxaphenalene derivative, 8-hydroxy-2-(2-hydroxypropyl)-7-acetyl-1-oxaphenalene (1a), together with seven known metabolites: ferulic acid (2), glycerol linoleate, linoleic acid methyl ester, (3R,4R)-3,4-dihydroxy-3-methylpentan-2-one/(3S,4R)-3,4-dihydroxy-3-methylpentan-2-one, anthranilic acid, phenylacetic acid, and benzoic acid. The chemical structure of the new compound (1a) was confirmed by extensive 1D and 2D NMR spectroscopy, high-resolution electron impact mass measurements, and by comparison with literature data. The antimicrobial activity of the strain extract and compounds 1a and 2 were studied using a panel of pathogenic microorganisms. The in vitro cytotoxicity of the bacterial extract was studied against the human cervix carcinoma cell line (KB-3-1) and its multi-drug-resistant subclone (KB-V1).
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Affiliation(s)
- Abdelaaty Hamed
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Ahmed S. Abdel-Razek
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Microbial Chemistry Department, Division of Genetic Engineering and Biotechnology Research, National Research Centre, Dokki-Cairo 12622, Egypt
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Daniel Wibberg
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, D-33615 Bielefeld, Germany
| | - Atef F. El-Haddad
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Tarek M. A. Ibrahim
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo 11884, Egypt
| | - Jörn Kalinowski
- Centrum für Biotechnologie (CeBiTec), Bielefeld University, D-33615 Bielefeld, Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | - Mohamed Shaaban
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
- Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries, National Research Centre, El-Behoos St. 33, Dokki-Cairo 12622, Egypt
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Kumar A, Kumar M, Sharma S, Guru SK, Bhushan S, Shah BA. Design and synthesis of a new class of cryptophycins based tubulin inhibitors. Eur J Med Chem 2015; 93:55-63. [DOI: 10.1016/j.ejmech.2014.11.068] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 11/10/2014] [Accepted: 11/30/2014] [Indexed: 10/24/2022]
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Fouotsa H, Tatsimo SJ, Neumann B, Michalek C, Mbazoa CD, Nkengfack AE, Sewald N, Lannang AM. A new xanthone derivative from twigs of Garcinia nobilis. Nat Prod Res 2014; 28:1030-6. [DOI: 10.1080/14786419.2014.903398] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hugues Fouotsa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Simplice J.N. Tatsimo
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Beate Neumann
- Inorganic and Structural Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Carmela Michalek
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Celine Djama Mbazoa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Alain Meli Lannang
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
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Dixit RB, Suseela MR. Cyanobacteria: potential candidates for drug discovery. Antonie van Leeuwenhoek 2013; 103:947-61. [DOI: 10.1007/s10482-013-9898-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Accepted: 02/28/2013] [Indexed: 11/30/2022]
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Nahrwold M, Weiß C, Bogner T, Mertink F, Conradi J, Sammet B, Palmisano R, Royo Gracia S, Preuße T, Sewald N. Conjugates of modified cryptophycins and RGD-peptides enter target cells by endocytosis. J Med Chem 2013; 56:1853-64. [PMID: 23387527 DOI: 10.1021/jm301346z] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tumor targeting anticancer drug conjugates that contain a tumor recognition motif (homing device) are of high current relevance. Cryptophycins, naturally occurring cytotoxic cyclo-depsipeptides, have been modified by total synthesis to provide analogues suitable for conjugation to peptide-based homing devices. An array of functionalized β(2)-amino acids was synthesized and incorporated into cryptophycins. All analogues proved to be highly active in the cytotoxicity assay using the human cervix carcinoma cell line KB-3-1 and its multidrug-resistant subclone KB-V1. Conformational analysis of cryptophycin-52 and two synthetic analogues was performed by NMR and MD methods to obtain information on the influence of the unit C configuration on the overall conformation. An azide-functionalized cryptophycin was connected by CuAAC to an alkyne-containing fluorescently labeled cyclic RGD-peptide as the homing device for internalization studies. Confocal fluorescence microscopy proved integrin-mediated internalization by endocytosis and final lysosomal localization of the cryptophycin prodrug.
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Affiliation(s)
- Markus Nahrwold
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
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Weiss C, Sammet B, Sewald N. Recent approaches for the synthesis of modified cryptophycins. Nat Prod Rep 2013; 30:924-40. [DOI: 10.1039/c3np70022d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Weiß C, Bogner T, Sammet B, Sewald N. Total synthesis and biological evaluation of fluorinated cryptophycins. Beilstein J Org Chem 2012; 8:2060-6. [PMID: 23209540 PMCID: PMC3511040 DOI: 10.3762/bjoc.8.231] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 11/09/2012] [Indexed: 12/25/2022] Open
Abstract
Cryptophycins are cytotoxic natural products that exhibit considerable activities even against multi-drug-resistant tumor cell lines. As fluorinated pharmaceuticals have become more and more important during the past decades, fluorine-functionalized cryptophycins were synthesized and evaluated in cell-based cytotoxicity assays. The unit A trifluoromethyl-modified cryptophycin proved to be highly active against KB-3-1 cells and exhibited an IC(50) value in the low picomolar range. However, the replacement of the 3-chloro-4-methoxyphenyl-substituent in unit B by a pentafluorophenyl moiety resulted in a significant loss of activity.
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Affiliation(s)
- Christine Weiß
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, PO Box 100131, 33501 Bielefeld, Germany
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41
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Sammet B, Brax M, Sewald N. A two step synthesis of a key unit B precursor of cryptophycins by asymmetric hydrogenation. Beilstein J Org Chem 2011; 7:243-5. [PMID: 21448253 PMCID: PMC3063055 DOI: 10.3762/bjoc.7.32] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 01/27/2011] [Indexed: 11/23/2022] Open
Abstract
A novel highly enantioselective two step access to a unit B precursor of cryptophycins in good yields from commercially available starting materials has been developed. The key step is an asymmetric hydrogenation using the commercially available [(COD)Rh-(R,R)-Et-DuPhos]BF4 catalyst. The synthetic route provides the advantage of less synthetic steps, proceeds with high yields and enantioselectivity, and avoids hazardous reaction conditions.
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Affiliation(s)
- Benedikt Sammet
- Bielefeld University, Department of Chemistry, Organic and Bioorganic Chemistry, Universitätsstraße 25, 33615 Bielefeld, Germany
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