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Nakaya T, Yabe M, Mashalidis EH, Sato T, Yamamoto K, Hikiji Y, Katsuyama A, Shinohara M, Minato Y, Takahashi S, Horiuchi M, Yokota SI, Lee SY, Ichikawa S. Synthesis of macrocyclic nucleoside antibacterials and their interactions with MraY. Nat Commun 2022; 13:7575. [PMID: 36539416 PMCID: PMC9768162 DOI: 10.1038/s41467-022-35227-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 11/23/2022] [Indexed: 12/24/2022] Open
Abstract
The development of new antibacterial drugs with different mechanisms of action is urgently needed to address antimicrobial resistance. MraY is an essential membrane enzyme required for bacterial cell wall synthesis. Sphaerimicins are naturally occurring macrocyclic nucleoside inhibitors of MraY and are considered a promising target in antibacterial discovery. However, developing sphaerimicins as antibacterials has been challenging due to their complex macrocyclic structures. In this study, we construct their characteristic macrocyclic skeleton via two key reactions. Having then determined the structure of a sphaerimicin analogue bound to MraY, we use a structure-guided approach to design simplified sphaerimicin analogues. These analogues retain potency against MraY and exhibit potent antibacterial activity against Gram-positive bacteria, including clinically isolated drug resistant strains of S. aureus and E. faecium. Our study combines synthetic chemistry, structural biology, and microbiology to provide a platform for the development of MraY inhibitors as antibacterials against drug-resistant bacteria.
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Affiliation(s)
- Takeshi Nakaya
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Miyuki Yabe
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Ellene H Mashalidis
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
- Pfizer Global Research & Development, Eastern Point Road, Groton, CT, 06340, USA
| | - Toyotaka Sato
- Laboratory of Veterinary Hygiene, School/Faculty of Veterinary Medicine, Hokkaido University, Kita-18, Nishi-9, Kita-ku, Sapporo, 060-0818, Japan
- Graduate School of Infectious Diseases, Hokkaido University, Sapporo, 060-0818, Japan
| | - Kazuki Yamamoto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Yuta Hikiji
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Akira Katsuyama
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
- Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Sapporo, Japan
| | - Motoko Shinohara
- Department of Microbiology, Fujita Health University School of Medicine, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan
| | - Yusuke Minato
- Department of Microbiology, Fujita Health University School of Medicine, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan
| | - Satoshi Takahashi
- Division of Laboratory Medicine, Sapporo Medical University Hospital, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan
- Department of Infection Control and Laboratory Medicine, Sapporo Medical University School of Medicine, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan
| | - Motohiro Horiuchi
- Laboratory of Veterinary Hygiene, School/Faculty of Veterinary Medicine, Hokkaido University, Kita-18, Nishi-9, Kita-ku, Sapporo, 060-0818, Japan
- Graduate School of Infectious Diseases, Hokkaido University, Sapporo, 060-0818, Japan
| | - Shin-Ichi Yokota
- Department of Microbiology, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan
| | - Seok-Yong Lee
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA.
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan.
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan.
- Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Sapporo, Japan.
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Pandey P, Chatterjee S, Berida T, Doerksen RJ, Roy S. Identification of potential non-nucleoside MraY inhibitors for tuberculosis chemotherapy using structure-based virtual screening. J Biomol Struct Dyn 2022; 40:4832-4849. [PMID: 33353500 PMCID: PMC9948644 DOI: 10.1080/07391102.2020.1862705] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/07/2020] [Indexed: 02/02/2023]
Abstract
The efforts to limit the spread of the tuberculosis epidemic have been challenged by the rise of drug-resistant strains of Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis. It is critical to discover new chemical scaffolds acting on novel or unexploited targets to beat this drug-resistant pathogen. MraY (phospho-MurNAc-pentapeptide translocase or translocase I) is an in vivo validated target for antibacterials-discovery. MraY is inhibited by nucleoside-based natural products that suffer from poor in vivo efficacy. The current study is focused on discovering novel chemical entities, particularly, non-nucleoside small molecules, as MraYMtb inhibitors possessing antituberculosis activity. In the absence of any reported X-ray crystal structures of MraYMtb, we used a homology model-based virtual screening approach combined with the ligand-based e-pharmacophore screening. We screened ∼12 million commercially available compounds from the ZINC15 database using GOLD software. The resulting hits were filtered using a 2-pronged screening method comprising e-pharmacophore hypotheses and docking against the MraYMtb homology model using Glide. Further clustering based on Glide scores and optimal binding interactions resulted in 15 in silico hits. We performed molecular dynamics (MD) simulations for the three best-ranking compounds and one other poorer-ranking compound, out of the 15 in silico hits, to analyze the interaction modes in detail. The MD simulations indicated stable interactions between the compounds and key residues in the MraY active site that are crucial for maintaining the enzymatic activity. These in silico hits could advance the antibacterial drug discovery campaign to find new MraY inhibitors for tuberculosis treatment.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Pankaj Pandey
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, University of Mississippi, University, MS 38677, USA
- National Center for Natural Products Research, University of Mississippi, University, MS 38677, USA
| | - Shamba Chatterjee
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, University of Mississippi, University, MS 38677, USA
| | - Tomayo Berida
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, University of Mississippi, University, MS 38677, USA
| | - Robert J. Doerksen
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, University of Mississippi, University, MS 38677, USA
| | - Sudeshna Roy
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, University of Mississippi, University, MS 38677, USA
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3
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Okamoto K, Ishikawa A, Okawa R, Yamamoto K, Sato T, Yokota SI, Chiba K, Ichikawa S. Design, synthesis and biological evaluation of simplified analogues of MraY inhibitory natural product with rigid scaffold. Bioorg Med Chem 2022; 55:116556. [PMID: 35016115 DOI: 10.1016/j.bmc.2021.116556] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 11/26/2021] [Accepted: 11/29/2021] [Indexed: 11/15/2022]
Abstract
Muraymycins and caprazamycins are strong inhibitors of MraY, which is responsible for peptidoglycan biosynthesis. Although they are promising antibacterial agents with a novel mode of action, their chemical structures are rather complex. This study investigated the simplification of these natural products by structure-based drug design, synthesis, and biological evaluation. We developed a simplified rigid scaffold with an arylalkyne moiety, which shows sub-micromolar MraY inhibitory activity. The scaffold is suitable for further investigating the structure-activity relationship by virtue of our synthetic strategy, where the substituent of interest is installed in the last stage of synthesis. This scaffold shows the potential for further use in optimizing MraY inhibitory and antibacterial activities.
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Affiliation(s)
- Kazuhiro Okamoto
- Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Aoi Ishikawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Ryotaro Okawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Kazuki Yamamoto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Toyotaka Sato
- Department of Microbiology, Sapporo Medical University, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan; Laboratory of Veterinary Hygiene, School/Faculty of Veterinary Medicine, Hokkaido University, Kita-18, Nishi-9, Kita-ku, Sapporo 060-0818, Japan
| | - Shin-Ichi Yokota
- Department of Microbiology, Sapporo Medical University, South-1, West-17, Chuo-ku, Sapporo 060-8556, Japan
| | - Kazuhiro Chiba
- Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan; Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan; Global Station for Biosurfaces and Drug Discovery, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
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4
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Garadi WA, Bakri YE, Lai CH, Anouar EH, Ghayati LE, Mague JT, Essassi EM. Synthesis, X-ray, spectroscopic characterization, Hirshfeld surface analysis, DFT calculation and molecular docking investigations of a novel 7-phenyl-2,3,4,5-tetrahydro-1H-1,4- diazepin-5-one derivative. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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McErlean M, Liu X, Cui Z, Gust B, Van Lanen SG. Identification and characterization of enzymes involved in the biosynthesis of pyrimidine nucleoside antibiotics. Nat Prod Rep 2021; 38:1362-1407. [PMID: 33404015 DOI: 10.1039/d0np00064g] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Covering: up to September 2020 Hundreds of nucleoside-based natural products have been isolated from various microorganisms, several of which have been utilized in agriculture as pesticides and herbicides, in medicine as therapeutics for cancer and infectious disease, and as molecular probes to study biological processes. Natural products consisting of structural modifications of each of the canonical nucleosides have been discovered, ranging from simple modifications such as single-step alkylations or acylations to highly elaborate modifications that dramatically alter the nucleoside scaffold and require multiple enzyme-catalyzed reactions. A vast amount of genomic information has been uncovered the past two decades, which has subsequently allowed the first opportunity to interrogate the chemically intriguing enzymatic transformations for the latter type of modifications. This review highlights (i) the discovery and potential applications of structurally complex pyrimidine nucleoside antibiotics for which genetic information is known, (ii) the established reactions that convert the canonical pyrimidine into a new nucleoside scaffold, and (iii) the important tailoring reactions that impart further structural complexity to these molecules.
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Affiliation(s)
- M McErlean
- Department of Pharmaceutical Science, College of Pharmacy, University of Kentucky, USA.
| | - X Liu
- Department of Pharmaceutical Science, College of Pharmacy, University of Kentucky, USA.
| | - Z Cui
- Department of Pharmaceutical Science, College of Pharmacy, University of Kentucky, USA.
| | - B Gust
- Pharmaceutical Institute, Department of Pharmaceutical Biology, University of Tübingen, Germany
| | - S G Van Lanen
- Department of Pharmaceutical Science, College of Pharmacy, University of Kentucky, USA.
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6
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Arbour CA, Imperiali B. Uridine natural products: Challenging targets and inspiration for novel small molecule inhibitors. Bioorg Med Chem 2020; 28:115661. [PMID: 32828427 DOI: 10.1016/j.bmc.2020.115661] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 07/18/2020] [Indexed: 12/16/2022]
Abstract
Nucleoside derivatives, in particular those featuring uridine, are familiar components of the nucleoside family of bioactive natural products. The structural complexity and biological activities of these compounds have inspired research from organic chemistry and chemical biology communities seeking to develop novel approaches to assemble the challenging molecular targets, to gain inspiration for enzyme inhibitor development and to fuel antibiotic discovery efforts. This review will present recent case studies describing the total synthesis and biosynthesis of uridine natural products, and de novo synthetic efforts exploiting features of the natural products to produce simplified scaffolds. This research has culminated in the development of complementary strategies that can lead to effective uridine-based inhibitors and antibiotics. The strengths and challenges of the juxtaposing methods will be illustrated by examining select uridine natural products. Moreover, structure-activity relationships (SAR) for each natural product-inspired scaffold will be discussed, highlighting the impact on inhibitor development, with the aim of future uridine-based small molecule expansion.
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Affiliation(s)
- Christine A Arbour
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Barbara Imperiali
- Department of Biology and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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7
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Shetye GS, Franzblau SG, Cho S. New tuberculosis drug targets, their inhibitors, and potential therapeutic impact. Transl Res 2020; 220:68-97. [PMID: 32275897 DOI: 10.1016/j.trsl.2020.03.007] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/28/2020] [Accepted: 03/09/2020] [Indexed: 11/18/2022]
Abstract
The current tuberculosis (TB) predicament poses numerous challenges and therefore every incremental scientific work and all positive socio-political engagements, are steps taken in the right direction to eradicate TB. Progression of the late stage TB-drug pipeline into the clinics is an immediate deliverable of this global effort. At the same time, fueling basic research and pursuing early discovery work must be sustained to maintain a healthy TB-drug pipeline. This review encompasses a broad analysis of chemotherapeutic strategies that target the DNA replication, protein synthesis, cell wall biosynthesis, energy metabolism and proteolysis of Mycobacterium tuberculosis (Mtb). It includes a status check of the current TB-drug pipeline with a focus on the associated biology, emerging targets, and their promising chemical inhibitors. Potential synergies and/or gaps within or across different chemotherapeutic strategies are systematically reviewed as well.
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Affiliation(s)
- Gauri S Shetye
- Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
| | - Scott G Franzblau
- Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
| | - Sanghyun Cho
- Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois.
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8
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Mashalidis EH, Lee SY. Structures of Bacterial MraY and Human GPT Provide Insights into Rational Antibiotic Design. J Mol Biol 2020; 432:4946-4963. [PMID: 32199982 DOI: 10.1016/j.jmb.2020.03.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 03/07/2020] [Accepted: 03/12/2020] [Indexed: 12/24/2022]
Abstract
The widespread emergence of antibiotic resistance in pathogens necessitates the development of antibacterial agents inhibiting underexplored targets in bacterial metabolism. One such target is phospho-MurNAc-pentapeptide translocase (MraY), an essential integral membrane enzyme that catalyzes the first committed step of peptidoglycan biosynthesis. MraY has long been considered a promising candidate for antibiotic development in part because it is the target of five classes of naturally occurring nucleoside inhibitors with potent in vivo and in vitro antibacterial activity. Although these inhibitors each have a nucleoside moiety, they vary dramatically in their core structures, and they have different activity properties. Until recently, the structural basis of MraY inhibition was poorly understood. Several recent structures of MraY and its human paralog, GlcNAc-1-P-transferase, have provided insights into MraY inhibition that are consistent with known inhibitor activity data and can inform rational drug design for this important antibiotic target.
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Affiliation(s)
- Ellene H Mashalidis
- Department of Biochemistry, Duke University Medical Center, 303 Research Drive,Durham, NC 27710, USA
| | - Seok-Yong Lee
- Department of Biochemistry, Duke University Medical Center, 303 Research Drive,Durham, NC 27710, USA.
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9
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Yuan C, Zhang H, Yuan M, Xie L, Cao X. Synthesis of 1,4-diazepinone derivatives via a domino aza-Michael/S N2 cyclization of 1-azadienes with α-halogenoacetamides. Org Biomol Chem 2020; 18:1082-1086. [PMID: 31971222 DOI: 10.1039/c9ob02626f] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel cyclization of α-halogenoacetamides with 1-azadienes has been developed for the efficient preparation of monocyclic 1,4-diazepinones in one step under transition metal-free conditions. Various α-halogenoacetamides and 1-azadienes are well tolerated and give the desired products in good to excellent yields. This cyclization also demonstrates potential synthetic utility on a gram-scale and further transformation.
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Affiliation(s)
- Chunhao Yuan
- School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, Shandong, P. R. China.
| | - Hui Zhang
- School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, Shandong, P. R. China.
| | - Mengna Yuan
- School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, Shandong, P. R. China.
| | - Lei Xie
- School of Pharmacy, Liaocheng University, Liaocheng 252000, Shandong, P. R. China
| | - Xiaoqun Cao
- School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, Shandong, P. R. China.
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Patel B, Grant G, Zunk M, Rudrawar S. Stereoselective Approaches toward the Synthesis of Nucleoside Antibiotic Core Aminoribosyl Glycyluridine. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900708] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Bhautikkumar Patel
- School of Pharmacy and Pharmacology Griffith University Gold Coast QLD 4222 Australia
- Quality Use of Medicines Network Griffith University Gold Coast QLD 4222 Australia
| | - Gary Grant
- School of Pharmacy and Pharmacology Griffith University Gold Coast QLD 4222 Australia
- Quality Use of Medicines Network Griffith University Gold Coast QLD 4222 Australia
| | - Matthew Zunk
- School of Pharmacy and Pharmacology Griffith University Gold Coast QLD 4222 Australia
- Quality Use of Medicines Network Griffith University Gold Coast QLD 4222 Australia
- Menzies Health Institute Queensland Griffith University Gold Coast QLD 4222 Australia
| | - Santosh Rudrawar
- School of Pharmacy and Pharmacology Griffith University Gold Coast QLD 4222 Australia
- Quality Use of Medicines Network Griffith University Gold Coast QLD 4222 Australia
- Menzies Health Institute Queensland Griffith University Gold Coast QLD 4222 Australia
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11
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Watanabe T. Chemical Studies on Bioactive Natural Products Directed toward Development of Novel Antiinfective and Anticancer Medicines. Chem Pharm Bull (Tokyo) 2019; 67:620-631. [PMID: 31257316 DOI: 10.1248/cpb.c19-00215] [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: 11/22/2022]
Abstract
Natural products are still rich sources of clinically used medicines and lead compounds for them. This review summarizes chemical studies carried out by the author on natural products of microorganism origin, many of which were discovered at the Institute of Microbial Chemistry (BIKAKEN). Caprazamycin B is a liponucleoside antibiotic from which CPZEN-45, an antituberculosis agent with a unique mode of action, was developed. Intervenolin and leucinostatin A exert antiproliferative activity toward tumor cells in the presence of the corresponding stromal cells, which implies that the primary molecular targets of these molecules should be related to growth signals from normal (stromal) cells. Details of the endeavors to establish efficient synthetic routes to these compounds which accelerated structure-activity relationship studies and further evaluation of biological activity are described.
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Mashalidis EH, Kaeser B, Terasawa Y, Katsuyama A, Kwon DY, Lee K, Hong J, Ichikawa S, Lee SY. Chemical logic of MraY inhibition by antibacterial nucleoside natural products. Nat Commun 2019; 10:2917. [PMID: 31266949 PMCID: PMC6606608 DOI: 10.1038/s41467-019-10957-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 06/06/2019] [Indexed: 01/01/2023] Open
Abstract
Novel antibacterial agents are needed to address the emergence of global antibiotic resistance. MraY is a promising candidate for antibiotic development because it is the target of five classes of naturally occurring nucleoside inhibitors with potent antibacterial activity. Although these natural products share a common uridine moiety, their core structures vary substantially and they exhibit different activity profiles. An incomplete understanding of the structural and mechanistic basis of MraY inhibition has hindered the translation of these compounds to the clinic. Here we present crystal structures of MraY in complex with representative members of the liposidomycin/caprazamycin, capuramycin, and mureidomycin classes of nucleoside inhibitors. Our structures reveal cryptic druggable hot spots in the shallow inhibitor binding site of MraY that were not previously appreciated. Structural analyses of nucleoside inhibitor binding provide insights into the chemical logic of MraY inhibition, which can guide novel approaches to MraY-targeted antibiotic design.
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Affiliation(s)
- Ellene H Mashalidis
- Department of Biochemistry, Duke University Medical Center, 303 Research Drive, Durham, NC, 27710, USA
| | - Benjamin Kaeser
- Department of Biochemistry, Duke University Medical Center, 303 Research Drive, Durham, NC, 27710, USA
| | - Yuma Terasawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nihi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Akira Katsuyama
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nihi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Do-Yeon Kwon
- Department of Chemistry, Duke University, Durham, NC, 27708, USA
| | - Kiyoun Lee
- Department of Chemistry, The Catholic University of Korea, Bucheon, 14662, Korea
| | - Jiyong Hong
- Department of Chemistry, Duke University, Durham, NC, 27708, USA
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nihi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Seok-Yong Lee
- Department of Biochemistry, Duke University Medical Center, 303 Research Drive, Durham, NC, 27710, USA.
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13
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Patel B, Ryan P, Makwana V, Zunk M, Rudrawar S, Grant G. Caprazamycins: Promising lead structures acting on a novel antibacterial target MraY. Eur J Med Chem 2019; 171:462-474. [DOI: 10.1016/j.ejmech.2019.01.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/24/2019] [Accepted: 01/28/2019] [Indexed: 11/29/2022]
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14
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Wiker F, Hauck N, Grond S, Gust B. Caprazamycins: Biosynthesis and structure activity relationship studies. Int J Med Microbiol 2019; 309:319-324. [PMID: 31138496 DOI: 10.1016/j.ijmm.2019.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 05/14/2019] [Accepted: 05/20/2019] [Indexed: 11/28/2022] Open
Abstract
Cell wall biosynthesis represents a valid target for antibacterial action but only a limited number of chemical structure classes selectively interact with specific enzymes or protein structures like transporters of the cell envelope. The integral membrane protein MraY translocase is essential for peptidoglycan biosynthesis catalysing the transfer of the peptidoglycan precursor phospho-MurNAc-pentapeptide to the lipid carrier undecaprenyl phosphate, thereby generating the cell wall intermediate lipid I. Not present in eukaryotic cells, MraY is a member of the superfamily of yet not well-understood integral membrane enzymes which involve proteins for bacterial lipopolysaccharide and teichoic acid or eukaryotic N-linked saccharides biosynthesis. Different natural nucleoside antibiotics as inhibitors of MraY translocase have been discovered comprising a glycosylated heterocyclic pyrimidin base among other potential lipid-, peptidic- or sugar moieties. Caprazamycins are liponucleoside antibiotics isolated from Streptomyces sp. MK730-62F2. They possess activity in vitro against Gram-positive bacteria, in particular against the genus Mycobacterium including M. intracellulare, M. avium and M. tuberculosis. Structural elucidation revealed the (+)-caprazol core skeleton as a unique moiety, the caprazamycins share with other MraY inhibitors such as the liposidomycins, A-90289 and the muraminomicins. They also share structural features such as uridyl-, aminoribosyl- and fatty acyl-moieties with other MraY translocase inhibitors like FR-900493 and the muraymycins. Intensive studies on their biosynthesis during the last decade identified not only common initial biosynthetic steps, but also revealed possible branching points towards individual biosynthesis of the respective compound. Structural diversity of caprazamycins was generated by feeding experiments, genetic engineering of the biosynthetic gene clusters and chemical synthesis for structure activity relationship studies with its target, MraY translocase.
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Affiliation(s)
- Franziska Wiker
- Pharmaceutical Biology, Pharmaceutical Institute, University of Tübingen, 72076 Tübingen, Germany
| | - Nils Hauck
- Pharmaceutical Biology, Pharmaceutical Institute, University of Tübingen, 72076 Tübingen, Germany
| | - Stephanie Grond
- Institute of Organic Chemistry, University of Tübingen, 72076 Tübingen, Germany
| | - Bertolt Gust
- Pharmaceutical Biology, Pharmaceutical Institute, University of Tübingen, 72076 Tübingen, Germany.
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15
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Nakamura H, Tsukano C, Yoshida T, Yasui M, Yokouchi S, Kobayashi Y, Igarashi M, Takemoto Y. Total Synthesis of Caprazamycin A: Practical and Scalable Synthesis of syn-β-Hydroxyamino Acids and Introduction of a Fatty Acid Side Chain to 1,4-Diazepanone. J Am Chem Soc 2019; 141:8527-8540. [PMID: 31067040 DOI: 10.1021/jacs.9b02220] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The first total synthesis of caprazamycin A (1), a representative liponucleoside antibiotic, is described. Diastereoselective aldol reactions of aldehydes 12 and 25-27, derived from uridine, with diethyl isocyanomalonate 13 and phenylcarbamate 21 were investigated using thiourea catalysts 14 or bases to synthesize syn-β-hydroxyamino acid derivatives. The 1,4-diazepanone core of 1 was constructed using a Mitsunobu reaction, and the fatty acid side chain was introduced using a stepwise sequence based on model studies. Notably, global deprotection was realized using palladium black and formic acid without hydrogenating the olefin in the uridine unit.
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Affiliation(s)
- Hugh Nakamura
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Chihiro Tsukano
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Takuma Yoshida
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Motohiro Yasui
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Shinsuke Yokouchi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Masayuki Igarashi
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku, Tokyo 141-0021 , Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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16
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Linder R, Ducho C. Unified Synthesis of Densely Functionalized Amino Acid Building Blocks for the Preparation of Caprazamycin Nucleoside Antibiotics. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ruth Linder
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry; Saarland University; Campus C2 3 66123 Saarbrücken Germany
| | - Christian Ducho
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry; Saarland University; Campus C2 3 66123 Saarbrücken Germany
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17
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Katsuyama A, Ichikawa S. Synthesis and Medicinal Chemistry of Muraymycins, Nucleoside Antibiotics. Chem Pharm Bull (Tokyo) 2018; 66:123-131. [PMID: 29386462 DOI: 10.1248/cpb.c17-00684] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Muraymycins, isolated from a culture broth of Streptomyces sp., are members of a class of naturally occurring nucleoside antibiotics. They are strong inhibitors of the phospho-MurNAc-pentapeptide translocase (MraY), which is responsible for the peptidoglycan biosynthesis. Since MraY is an essential enzyme among bacteria, muraymycins are expected to be a novel antibacterial agent. In this review, our efforts to synthesize muraymycin D2, simplify the chemical structure, improve antibacterial spectrum, and solve the X-ray crystal structure of the muraymycin D2/MraY complex are described.
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Affiliation(s)
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Science, Hokkaido University.,Center for Research and Education on Drug Discovery, Hokkaido University
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18
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Watanabe T, Shibasaki M. Catalytic Asymmetric Synthesis of Natural Products Directed Toward Development of Novel Anti-infective and Anti-cancer Medicines. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Lungu CN, Diudea MV, Putz MV. Ligand Shaping in Induced Fit Docking of MraY Inhibitors. Polynomial Discriminant and Laplacian Operator as Biological Activity Descriptors. Int J Mol Sci 2017; 18:E1377. [PMID: 28653980 PMCID: PMC5535870 DOI: 10.3390/ijms18071377] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 06/13/2017] [Accepted: 06/17/2017] [Indexed: 11/16/2022] Open
Abstract
Docking-i.e., interaction of a small molecule (ligand) with a proteic structure (receptor)-represents the ground of drug action mechanism of the vast majority of bioactive chemicals. Ligand and receptor accommodate their geometry and energy, within this interaction, in the benefit of receptor-ligand complex. In an induced fit docking, the structure of ligand is most susceptible to changes in topology and energy, comparative to the receptor. These changes can be described by manifold hypersurfaces, in terms of polynomial discriminant and Laplacian operator. Such topological surfaces were represented for each MraY (phospho-MurNAc-pentapeptide translocase) inhibitor, studied before and after docking with MraY. Binding affinities of all ligands were calculated by this procedure. For each ligand, Laplacian and polynomial discriminant were correlated with the ligand minimum inhibitory concentration (MIC) retrieved from literature. It was observed that MIC is correlated with Laplacian and polynomial discriminant.
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Affiliation(s)
- Claudiu N Lungu
- Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400028 Cluj, Romania.
| | - Mircea V Diudea
- Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400028 Cluj, Romania.
| | - Mihai V Putz
- Laboratory of Computational and Structural Physical-Chemistry for Nanosciences and QSAR, Department of Biology-Chemistry, West University of Timisoara, Pestalozzi Str. 16, 300115 Timisoara, Romania.
- Laboratory of Renewable Energies-Photovoltaics, R&D National Institute for Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Str. No. 144, 300569 Timisoara, Romania.
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20
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Serpi M, Ferrari V, Pertusati F. Nucleoside Derived Antibiotics to Fight Microbial Drug Resistance: New Utilities for an Established Class of Drugs? J Med Chem 2016; 59:10343-10382. [PMID: 27607900 DOI: 10.1021/acs.jmedchem.6b00325] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Novel antibiotics are urgently needed to combat the rise of infections due to drug-resistant microorganisms. Numerous natural nucleosides and their synthetically modified analogues have been reported to have moderate to good antibiotic activity against different bacterial and fungal strains. Nucleoside-based compounds target several crucial processes of bacterial and fungal cells such as nucleoside metabolism and cell wall, nucleic acid, and protein biosynthesis. Nucleoside analogues have also been shown to target many other bacterial and fungal cellular processes although these are not well characterized and may therefore represent opportunities to discover new drugs with unique mechanisms of action. In this Perspective, we demonstrate that nucleoside analogues, cornerstones of anticancer and antiviral treatments, also have great potential to be repurposed as antibiotics so that an old drug can learn new tricks.
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Affiliation(s)
- Michaela Serpi
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University , Redwood Building, King Edward VII Avenue, CF10 3NB Cardiff, United Kingdom
| | - Valentina Ferrari
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University , Redwood Building, King Edward VII Avenue, CF10 3NB Cardiff, United Kingdom
| | - Fabrizio Pertusati
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University , Redwood Building, King Edward VII Avenue, CF10 3NB Cardiff, United Kingdom
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21
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Mitachi K, Aleiwi BA, Schneider CM, Siricilla S, Kurosu M. Stereocontrolled Total Synthesis of Muraymycin D1 Having a Dual Mode of Action against Mycobacterium tuberculosis. J Am Chem Soc 2016; 138:12975-12980. [PMID: 27617631 DOI: 10.1021/jacs.6b07395] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stereocontrolled first total synthesis of muraymycin D1 (1) has been achieved. The synthetic route is highly stereoselective, featuring (1) selective β-ribosylation of the C2-methylated amino ribose, (2) selective Strecker reaction, and (3) ring-opening reaction of a diastereomeric mixture of a diaminolactone to synthesize muraymycidine (epi-capreomycidine). The acid-cleavable protecting groups for secondary alcohol and uridine ureido nitrogen are applied for simultaneous deprotections with the Boc and tBu groups. Muraymycin D1 (1) and its amide derivatives (2 and 3) exhibited growth inhibitory activity against Mycobacterium tuberculosis (MIC50 = 1.56-6.25 μg/mL) and strong enzyme inhibitory activities against the bacterial phosphotransferases (MurX and WecA) (IC50 = 0.096-0.69 μM).
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Affiliation(s)
- Katsuhiko Mitachi
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , 881 Madison Avenue, Memphis, Tennessee 38163, United States
| | - Bilal A Aleiwi
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , 881 Madison Avenue, Memphis, Tennessee 38163, United States
| | - Christopher M Schneider
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , 881 Madison Avenue, Memphis, Tennessee 38163, United States
| | - Shajila Siricilla
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , 881 Madison Avenue, Memphis, Tennessee 38163, United States
| | - Michio Kurosu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center , 881 Madison Avenue, Memphis, Tennessee 38163, United States
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22
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23
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Wiegmann D, Koppermann S, Wirth M, Niro G, Leyerer K, Ducho C. Muraymycin nucleoside-peptide antibiotics: uridine-derived natural products as lead structures for the development of novel antibacterial agents. Beilstein J Org Chem 2016; 12:769-795. [PMID: 27340469 PMCID: PMC4902027 DOI: 10.3762/bjoc.12.77] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/24/2016] [Indexed: 11/23/2022] Open
Abstract
Muraymycins are a promising class of antimicrobial natural products. These uridine-derived nucleoside-peptide antibiotics inhibit the bacterial membrane protein translocase I (MraY), a key enzyme in the intracellular part of peptidoglycan biosynthesis. This review describes the structures of naturally occurring muraymycins, their mode of action, synthetic access to muraymycins and their analogues, some structure-activity relationship (SAR) studies and first insights into muraymycin biosynthesis. It therefore provides an overview on the current state of research, as well as an outlook on possible future developments in this field.
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Affiliation(s)
- Daniel Wiegmann
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
| | - Stefan Koppermann
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
| | - Marius Wirth
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
| | - Giuliana Niro
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
| | - Kristin Leyerer
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
| | - Christian Ducho
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbruecken, Germany
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24
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Nakamura H, Yoshida T, Tsukano C, Takemoto Y. Synthesis of CPZEN-45: Construction of the 1,4-Diazepin-2-one Core by the Cu-Catalyzed Intramolecular Amidation of a Vinyl Iodide. Org Lett 2016; 18:2300-3. [PMID: 27088563 DOI: 10.1021/acs.orglett.6b00943] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
CPZEN-45 was developed as an antibiotic against Mycobacterium tuberculosis by the chemical modification of caprazamycins. CPZEN-45 has been synthesized in this study by the Cu-catalyzed intramolecular amidation of a complex vinyl iodide precursor bearing uridine and sugar moieties with a secondary amide, allowing for the construction of its 1,4-diazepin-2-one core.
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Affiliation(s)
- Hugh Nakamura
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takuma Yoshida
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Chihiro Tsukano
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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25
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Ichikawa S. Function-Oriented Synthesis: How to Design Simplified Analogues of Antibacterial Nucleoside Natural Products? CHEM REC 2016; 16:1106-15. [DOI: 10.1002/tcr.201500247] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Satoshi Ichikawa
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences Hokkaido University; Kita-12 Nishi-6 Kita-ku Sapporo 060-0812 Japan
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26
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Crane EA, Gademann K. Synthetisch gewonnene Naturstofffragmente in der Wirkstoffentwicklung. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201505863] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Erika A. Crane
- Departement Chemie; Universität Basel; St. Johanns-Ring 19 CH-4056 Basel Schweiz
| | - Karl Gademann
- Departement Chemie; Universität Basel; St. Johanns-Ring 19 CH-4056 Basel Schweiz
- Institut für Chemie; Universität Zürich; Winterthurerstrasse 190 CH-8057 Zürich Schweiz
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27
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Crane EA, Gademann K. Capturing Biological Activity in Natural Product Fragments by Chemical Synthesis. Angew Chem Int Ed Engl 2016; 55:3882-902. [PMID: 26833854 PMCID: PMC4797711 DOI: 10.1002/anie.201505863] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Indexed: 12/22/2022]
Abstract
Natural products have had an immense influence on science and have directly led to the introduction of many drugs. Organic chemistry, and its unique ability to tailor natural products through synthesis, provides an extraordinary approach to unlock the full potential of natural products. In this Review, an approach based on natural product derived fragments is presented that can successfully address some of the current challenges in drug discovery. These fragments often display significantly reduced molecular weights, reduced structural complexity, a reduced number of synthetic steps, while retaining or even improving key biological parameters such as potency or selectivity. Examples from various stages of the drug development process up to the clinic are presented. In addition, this process can be leveraged by recent developments such as genome mining, antibody–drug conjugates, and computational approaches. All these concepts have the potential to identify the next generation of drug candidates inspired by natural products.
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Affiliation(s)
- Erika A Crane
- Department of Chemistry, University of Basel, Switzerland
| | - Karl Gademann
- Department of Chemistry, University of Basel, Switzerland. .,Department of Chemistry, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland.
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28
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Chiba T, Nakaya T, Katayama K, Matsuda A, Ichikawa S. Natural Product Synthesis by Multicomponent Reaction and Structure-activity Relationship Study. J SYN ORG CHEM JPN 2016. [DOI: 10.5059/yukigoseikyokaishi.74.426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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Shiraishi T, Hiro N, Igarashi M, Nishiyama M, Kuzuyama T. Biosynthesis of the antituberculous agent caprazamycin: Identification of caprazol-3ʺ-phosphate, an unprecedented caprazamycin-related metabolite. J GEN APPL MICROBIOL 2016; 62:164-6. [DOI: 10.2323/jgam.2016.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | - Noboru Hiro
- Biotechnology Research Center, The University of Tokyo
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30
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Fer MJ, Bouhss A, Patrão M, Le Corre L, Pietrancosta N, Amoroso A, Joris B, Mengin-Lecreulx D, Calvet-Vitale S, Gravier-Pelletier C. 5'-Methylene-triazole-substituted-aminoribosyl uridines as MraY inhibitors: synthesis, biological evaluation and molecular modeling. Org Biomol Chem 2015; 13:7193-222. [PMID: 26008868 DOI: 10.1039/c5ob00707k] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The straightforward synthesis of 5'-methylene-[1,4]-triazole-substituted aminoribosyl uridines is described. Two families of compounds were synthesized from a unique epoxide which was regioselectively opened by acetylide ions (for compounds II) or azide ions (for compounds III). Sequential diastereoselective glycosylation with a ribosyl fluoride derivative, Cu(i)-catalyzed azide-alkyne cycloaddition (CuAAC) with various complementary azide and alkyne partners afforded the targeted compounds after final deprotection. The biological activity of the 16 resulting compounds together with that of 14 previously reported compounds I, lacking the 5' methylene group, was evaluated on the MraY transferase activity. Out of the 30 tested compounds, 18 compounds revealed MraY inhibition with IC50 ranging from 15 to 150 μM. A molecular modeling study was performed to rationalize the observed structure-activity relationships (SAR), which allowed us to correlate the activity of the most potent compounds with an interaction involving Leu191 of MraYAA. The antibacterial activity was also evaluated and seven compounds exhibited a good activity against Gram-positive bacterial pathogens with MIC ranging from 8 to 32 μg mL(-1), including the methicillin resistant Staphylococcus aureus (MRSA).
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Affiliation(s)
- Mickaël J Fer
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, Sorbonne Paris Cité, CICB-Paris (Centre Interdisciplinaire Chimie Biologie-Paris), 45 rue des Saints Pères, 75270 Paris 06, France.
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31
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Ichikawa S, Yamaguchi M, Hsuan LS, Kato Y, Matsuda A. Carbacaprazamycins: Chemically Stable Analogues of the Caprazamycin Nucleoside Antibiotics. ACS Infect Dis 2015; 1:151-6. [PMID: 27622529 DOI: 10.1021/id5000376] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carbacaprazamycins, which are chemically stable analogues of caprazamycins, were designed and synthesized. These analogues were active against drug-resistant bacterial pathogens such as methicillin-resistant Staphylococcus aureus and vancomycin-resistant enterococci, and their activities were comparable to those of the parent caprazamycins. The effect of treatment with carbacaprazamycin on morphological changes in S. aureus indicated that the mode of action was completely different from those of existing peptidoglycan inhibitors.
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Affiliation(s)
- Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences and ‡Center for Research
and Education on Drug Discovery, Hokkaido University, Kita-12,
Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Mayumi Yamaguchi
- Faculty of Pharmaceutical Sciences and ‡Center for Research
and Education on Drug Discovery, Hokkaido University, Kita-12,
Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Lee Shang Hsuan
- Faculty of Pharmaceutical Sciences and ‡Center for Research
and Education on Drug Discovery, Hokkaido University, Kita-12,
Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Yuta Kato
- Faculty of Pharmaceutical Sciences and ‡Center for Research
and Education on Drug Discovery, Hokkaido University, Kita-12,
Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Akira Matsuda
- Faculty of Pharmaceutical Sciences and ‡Center for Research
and Education on Drug Discovery, Hokkaido University, Kita-12,
Nishi-6, Kita-ku, Sapporo 060-0812, Japan
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32
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Nakamura H, Tsukano C, Yasui M, Yokouchi S, Igarashi M, Takemoto Y. Total Synthesis of (−)-Caprazamycin A. Angew Chem Int Ed Engl 2015; 54:3136-9. [DOI: 10.1002/anie.201411954] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Indexed: 12/19/2022]
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33
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Nakamura H, Tsukano C, Yasui M, Yokouchi S, Igarashi M, Takemoto Y. Total Synthesis of (−)-Caprazamycin A. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411954] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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34
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Nakaya T, Matsuda A, Ichikawa S. Design, synthesis and biological evaluation of 5′-C-piperidinyl-5′-O-aminoribosyluridines as potential antibacterial agents. Org Biomol Chem 2015; 13:7720-35. [DOI: 10.1039/c5ob01037c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Caprazamycin analogues, which were designed and synthesized via an aza-Prins–Ritter reaction, exhibit a good MraY and antibacterial activity without cytotoxicity against human cells.
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Affiliation(s)
- Takeshi Nakaya
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
| | - Akira Matsuda
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
- Center for Research and Education on Drug Discovery
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
- Center for Research and Education on Drug Discovery
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35
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Yamaguchi M, Matsuda A, Ichikawa S. Synthesis of isoxazolidine-containing uridine derivatives as caprazamycin analogues. Org Biomol Chem 2015; 13:1187-97. [DOI: 10.1039/c4ob02142h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Simplification of caprazamycins was conducted by scaffold-hopping of the structurally complex diazepanone moiety to the isoxazolidine scaffold.
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Affiliation(s)
- Mayumi Yamaguchi
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
| | - Akira Matsuda
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
| | - Satoshi Ichikawa
- Faculty of Pharmaceutical Sciences
- Hokkaido University
- Sapporo 060-0812
- Japan
- Center for Research and Education on Drug Discovery
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36
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Spork AP, Büschleb M, Ries O, Wiegmann D, Boettcher S, Mihalyi A, Bugg TDH, Ducho C. Lead structures for new antibacterials: stereocontrolled synthesis of a bioactive muraymycin analogue. Chemistry 2014; 20:15292-7. [PMID: 25318977 DOI: 10.1002/chem.201404775] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Indexed: 11/10/2022]
Abstract
Naturally occurring muraymycin nucleoside antibiotics represent a promising class of novel antibacterial agents. The structural complexity suggests the investigation of simplified analogues as potential lead structures, which can then be further optimized towards highly potent antimicrobials. Herein we report studies on muraymycin-derived potential lead structures lacking an aminoribose motif found in most naturally occurring muraymycins. We have identified a 5'-defunctionalized motif to be ideal in terms of stability and chemical accessibility and have synthesized a full-length muraymycin analogue based on this structure using a novel fully stereocontrolled route. The obtained 5'-deoxy analogue of the natural product muraymycin C4 showed good inhibitory properties towards the bacterial target protein MraY, sufficient pharmacokinetic stability and no cytotoxicity against human cells, thus making it a promising lead for antibacterial drug development.
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Affiliation(s)
- Anatol P Spork
- Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbrücken (Germany); Department of Chemistry, Institute of Organic and Biomolecular Chemistry, Georg-August-University Göttingen, Tammannstr. 2, 37077 Göttingen (Germany)
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37
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Gopinath P, Wang L, Abe H, Ravi G, Masuda T, Watanabe T, Shibasaki M. Catalytic asymmetric total synthesis of (+)-caprazol. Org Lett 2014; 16:3364-7. [PMID: 24897294 DOI: 10.1021/ol501397b] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Catalytic asymmetric total synthesis of caprazol, a lipo-nucleoside antibiotic, has been accomplished employing two of the stereoselective C-C bond forming reactions as key transformations. The stereochemistries of the β-hydroxy-α-aminoester moiety at the juncture of the uridine part and diazepanone part, and of the β-hydroxy-α-amino acid moiety embedded in the diazepanone system, were constructed using a diastereoselective isocyanoacetate aldol reaction (dr = 88:12) and an enantioselective anti-nitroaldol reaction catalyzed by a Nd/Na-chiral amide ligand (dr = 12:1, 95% ee), respectively.
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Affiliation(s)
- Purushothaman Gopinath
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo 141-0021, Japan
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Wender PA, Donnelly AC, Loy BA, Near KE, Staveness D. Rethinking the Role of Natural Products: Function-Oriented Synthesis, Bryostatin, and Bryologs. METHODS AND PRINCIPLES IN MEDICINAL CHEMISTRY 2014. [DOI: 10.1002/9783527676545.ch14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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40
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Banerjee D, Junge K, Beller M. A General Catalytic Hydroamidation of 1,3-Dienes: Atom-Efficient Synthesis ofN-Allyl Heterocycles, Amides, and Sulfonamides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201308874] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Banerjee D, Junge K, Beller M. A General Catalytic Hydroamidation of 1,3-Dienes: Atom-Efficient Synthesis ofN-Allyl Heterocycles, Amides, and Sulfonamides. Angew Chem Int Ed Engl 2014; 53:1630-5. [DOI: 10.1002/anie.201308874] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Indexed: 11/10/2022]
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42
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Miyaoka H, Wada J, Kawashima E. Synthesis of the Diazepanone-Nucleoside Core Structure of Liposidomycins and Caprazamycins Based on 7-Exo Cyclization of Epoxyamine. HETEROCYCLES 2014. [DOI: 10.3987/com-13-s(s)34] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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43
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Funabashi M, Baba S, Takatsu T, Kizuka M, Ohata Y, Tanaka M, Nonaka K, Spork AP, Ducho C, Chen WCL, Van Lanen SG. Structure-based gene targeting discovery of sphaerimicin, a bacterial translocase I inhibitor. Angew Chem Int Ed Engl 2013; 52:11607-11. [PMID: 24014169 PMCID: PMC3873198 DOI: 10.1002/anie.201305546] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Indexed: 12/27/2022]
Abstract
Rise and shine: Using a gene-targeting approach aimed at identifying potential L-threonine:uridine-5'-transaldolases that catalyze the formation of (5'S,6'S)-C-glycyluridine, a new bacterial translocase I inhibitor was discovered from an actinomycete following fermentation optimization.
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Affiliation(s)
- Masanori Funabashi
- Natural Product Research Group, Discovery Science and Technology Department, Drug Discovery and Biomedical Technology Unit, Daiichi Sankyo RD Novare Co., Ltd., Tokyo 134-8630 (Japan)
| | - Satoshi Baba
- New Modality Research Laboratories, R&D Division, Daiichi Sankyo Co., Ltd., Tokyo 140-8710 (Japan)
| | - Toshio Takatsu
- Analytical Chemistry Research Group, Center for Pharmaceutical and Biomedical Analysis, Daiichi Sankyo RD Novare Co., Ltd., Tokyo 134-8630 (Japan)
| | - Masaaki Kizuka
- Natural Product Research Group, Discovery Science and Technology Department, Drug Discovery and Biomedical Technology Unit, Daiichi Sankyo RD Novare Co., Ltd., Tokyo 134-8630 (Japan)
| | - Yasuo Ohata
- Analytical Chemistry Research Group, Center for Pharmaceutical and Biomedical Analysis, Daiichi Sankyo RD Novare Co., Ltd., Tokyo 134-8630 (Japan)
| | - Masahiro Tanaka
- Natural Product Research Group, Discovery Science and Technology Department, Drug Discovery and Biomedical Technology Unit, Daiichi Sankyo RD Novare Co., Ltd., Tokyo 134-8630 (Japan)
| | - Koichi Nonaka
- Biologics Technology Research Laboratories, R&D Division, Daiichi Sankyo Co., Ltd., Gunma 370-0503 (Japan)
| | - Anatol P Spork
- Department of Chemistry, University of Paderborn, Paderborn 33098 (Germany)
| | - Christian Ducho
- Department of Chemistry, University of Paderborn, Paderborn 33098 (Germany)
| | - Wei-Chen Leyla Chen
- Department of Pharmaceutical Sciences College of Pharmacy, University of Kentucky 789 S. Limestone Street, Lexington, KY 40536 (USA)
| | - Steven G Van Lanen
- Department of Pharmaceutical Sciences College of Pharmacy, University of Kentucky 789 S. Limestone Street, Lexington, KY 40536 (USA)
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Fer MJ, Olatunji S, Bouhss A, Calvet-Vitale S, Gravier-Pelletier C. Toward Analogues of MraY Natural Inhibitors: Synthesis of 5′-Triazole-Substituted-Aminoribosyl Uridines Through a Cu-Catalyzed Azide–Alkyne Cycloaddition. J Org Chem 2013; 78:10088-105. [DOI: 10.1021/jo4014035] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mickaël J. Fer
- Laboratoire de
Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes, UMR 8601 CNRS, 45 rue des Saints Pères, 75006 Paris, France
| | - Samir Olatunji
- Laboratoire
des
Enveloppes Bactériennes et Antibiotiques, Institut de Biochimie
et Biophysique Moléculaire et Cellulaire, Université Paris-Sud 11, UMR 8619 CNRS, Orsay F-91405, France
| | - Ahmed Bouhss
- Laboratoire
des
Enveloppes Bactériennes et Antibiotiques, Institut de Biochimie
et Biophysique Moléculaire et Cellulaire, Université Paris-Sud 11, UMR 8619 CNRS, Orsay F-91405, France
| | - Sandrine Calvet-Vitale
- Laboratoire de
Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes, UMR 8601 CNRS, 45 rue des Saints Pères, 75006 Paris, France
| | - Christine Gravier-Pelletier
- Laboratoire de
Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes, UMR 8601 CNRS, 45 rue des Saints Pères, 75006 Paris, France
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Hanif SNM, Hickey AJ, Garcia-Contreras L. Liquid chromatographic determination of CPZEN-45, a novel anti-tubercular drug, in biological samples. J Pharm Biomed Anal 2013; 88:370-6. [PMID: 24176740 DOI: 10.1016/j.jpba.2013.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2013] [Revised: 09/06/2013] [Accepted: 09/08/2013] [Indexed: 11/18/2022]
Abstract
CPZEN-45 is a new drug candidate being considered for the treatment of tuberculosis (TB). The aim of this study was to develop and validate a reverse-phase high-performance liquid chromatographic (HPLC) method suitable to determine CPZEN-45 concentrations in biological samples. CPZEN-45 was extracted from biological fluids and tissues (plasma, lung and spleen from guinea pig) by sequential extraction with acetonitrile and quantified by a Waters HPLC Alliance System coupled with a ZORBAX Bonus-RP column, guard column and UV detection at 263nm. The mobile phase was 20:80 acetonitrile:ultrapure-water with 0.05% TFA. The CPZEN-45 peak was eluted at 5.1min with no interference from the inherent peaks of plasma, bronchoalveolar lavage (BAL), lung or spleen tissues. Recovery of CPZEN-45 from biological samples was >96% of the spiked amount. The limit of detection was 0.05μg/ml and the limit of quantitation was 0.29μg/ml which was more than 5 and 21 times lower than the reported minimal inhibitory concentration of CPZEN-45 (MIC=1.56μg/ml for Mycobacterium tuberculosis and 6.25μg/ml for MDR-TB, respectively). Thus, HPLC method was deemed reliable, sensitive, reproducible and accurate for the determination of CPZEN-45 concentrations in plasma, BAL, lung and spleen tissues. Therefore, this method was used in subsequent studies in the guinea pig model to determine the disposition of CPZEN-45 after administration of solutions by the IV and SC routes.
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Affiliation(s)
- S N M Hanif
- Department of Pharmaceutical Sciences, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73126-0901, United States.
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46
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Funabashi M, Baba S, Takatsu T, Kizuka M, Ohata Y, Tanaka M, Nonaka K, Spork AP, Ducho C, Chen WCL, Van Lanen SG. Structure-Based Gene Targeting Discovery of Sphaerimicin, a Bacterial Translocase I Inhibitor. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305546] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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47
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Schitter G, Wrodnigg TM. Update on carbohydrate-containing antibacterial agents. Expert Opin Drug Discov 2013; 4:315-56. [PMID: 23489128 DOI: 10.1517/17460440902778725] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Since the first known use of antibiotics > 2,500 years ago, a research field with immense importance for the welfare of mankind has been developed. After a decrease in interest in this topic by the end of the 20th century the occurrence of (poly-)resistant strains of bacteria induced a revival of antibiotics research. Health systems have been seeking viable and reliable solutions to this dangerous and expansive threat. OBJECTIVE This review will focus on carbohydrate-containing antibiotics and will give an outline of recently published novel isolated, semisynthetic as well as synthetic structures, their mechanism of action, if known, and the strategies for the design of compounds with potential by improved antibacterial properties. METHODS The literature between 2000 and 2008 was screened with main focus on recent examples of novel structures and strategies for the lead finding of exclusively antibacterial agents. RESULTS/CONCLUSION With the explanation of the role of the carbohydrate moieties in the respective antibacterial agents together with better synthetic strategies in carbohydrate chemistry as well as improvements in assay development for high throughput screening methods, carbohydrate-containing antibiotics can be used for the finding of potential drug leads that contribute to the fight against infections and diseases caused by (resistant) bacterial pathogens.
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Affiliation(s)
- Georg Schitter
- Technical University Graz, Institute of Organic Chemistry, Univ.-Doz. TMW, Dip.-Ing. GS, Glycogroup, A-8010 Graz, Austria +43 316 873 8744 ; +43 316 873 8740 ;
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Gopinath P, Watanabe T, Shibasaki M. Studies on Catalytic Enantioselective Total Synthesis of Caprazamycin B: Construction of the Western Zone. J Org Chem 2012; 77:9260-7. [DOI: 10.1021/jo301803h] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Purushothaman Gopinath
- Institute of Microbial Chemistry (BIKAKEN), Tokyo,
3-14-23 Kamiosaki, Shinagawa-ku, Tokyo 141-0021, Japan
| | - Takumi Watanabe
- Institute of Microbial Chemistry (BIKAKEN), Tokyo,
3-14-23 Kamiosaki, Shinagawa-ku, Tokyo 141-0021, Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo,
3-14-23 Kamiosaki, Shinagawa-ku, Tokyo 141-0021, Japan
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49
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Banerjee D, Jagadeesh RV, Junge K, Junge H, Beller M. Efficient and Convenient Palladium-Catalyzed Amination of Allylic Alcohols with N-Heterocycles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206319] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Banerjee D, Jagadeesh RV, Junge K, Junge H, Beller M. Efficient and Convenient Palladium-Catalyzed Amination of Allylic Alcohols with N-Heterocycles. Angew Chem Int Ed Engl 2012; 51:11556-60. [DOI: 10.1002/anie.201206319] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Indexed: 11/10/2022]
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