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Wachino JI, Jin W, Norizuki C, Kimura K, Tsuji M, Kurosaki H, Arakawa Y. Hydroxyhexylitaconic acids as potent IMP-type metallo-β-lactamase inhibitors for controlling carbapenem resistance in Enterobacterales. Microbiol Spectr 2024; 12:e0234423. [PMID: 38315122 PMCID: PMC10913484 DOI: 10.1128/spectrum.02344-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 12/06/2023] [Indexed: 02/07/2024] Open
Abstract
Metallo-β-lactamases (MBLs) represent one of the main causes of carbapenem resistance in the order Enterobacterales. To combat MBL-producing carbapenem-resistant Enterobacterales, the development of MBL inhibitors can restore carbapenem efficacy for such resistant bacteria. Microbial natural products are a promising source of attractive seed compounds for the development of antimicrobial agents. Here, we report that hydroxyhexylitaconic acids (HHIAs) produced by a member of the genus Aspergillus can suppress carbapenem resistance conferred by MBLs, particularly IMP (imipenemase)-type MBLs. HHIAs were found to be competitive inhibitors with micromolar orders of magnitude against IMP-1 and showed weak inhibitory activity toward VIM-2, while no inhibitory activity against NDM-1 was observed despite the high dosage. The elongated methylene chains of HHIAs seem to play a crucial role in exerting inhibitory activity because itaconic acid, a structural analog without long methylene chains, did not show inhibitory activity against IMP-1. The addition of HHIAs restored meropenem and imipenem efficacy to satisfactory clinical levels against IMP-type MBL-producing Escherichia coli and Klebsiella pneumoniae clinical isolates. Unlike EDTA and Aspergillomarasmine A, HHIAs did not cause the loss of zinc ions from the active site, resulting in the structural instability of MBLs. X-ray crystallography and in silico docking simulation analyses revealed that two neighboring carboxylates of HHIAs coordinated with two zinc ions in the active sites of VIM-2 and IMP-1, which formed a key interaction observed in MBL inhibitors. Our results indicated that HHIAs are promising for initiating the design of potent inhibitors of IMP-type MBLs.IMPORTANCEThe number and type of metallo-β-lactamase (MΒL) are increasing over time. Carbapenem resistance conferred by MΒL is a significant threat to our antibiotic regimen, and the development of MΒL inhibitors is urgently required to restore carbapenem efficacy. Microbial natural products have served as important sources for developing antimicrobial agents targeting pathogenic bacteria since the discovery of antibiotics in the mid-20th century. MΒL inhibitors derived from microbial natural products are still rare compared to those derived from chemical compound libraries. Hydroxyhexylitaconic acids (HHIAs) produced by members of the genus Aspergillus have potent inhibitory activity against clinically relevant IMP-type MBL. HHIAs may be good lead compounds for the development of MBL inhibitors applicable for controlling carbapenem resistance in IMP-type MBL-producing Enterobacterales.
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Affiliation(s)
- Jun-ichi Wachino
- Department of Medical Technology, Faculty of Medical Sciences, Shubun University, Ichinomiya, Aichi, Japan
- Department of Bacteriology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Wanchun Jin
- College of Pharmacy, Kinjo Gakuin University, Nagoya, Aichi, Japan
| | - Chihiro Norizuki
- Department of Medical Technology, Faculty of Medical Sciences, Shubun University, Ichinomiya, Aichi, Japan
| | - Kouji Kimura
- Department of Bacteriology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | | | | | - Yoshichika Arakawa
- Department of Medical Technology, Faculty of Medical Sciences, Shubun University, Ichinomiya, Aichi, Japan
- Department of Bacteriology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
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Phutthacharoen K, Khalid SJ, Schrey H, Hyde KD, Stadler M, Ebada SS. Diaporphasines E and F: New Polyketides from the Saprotrophic Fungus Lachnum sp. IW157 Growing on the Reed Grass Phragmites communis. ACS OMEGA 2023; 8:41689-41695. [PMID: 37970032 PMCID: PMC10633876 DOI: 10.1021/acsomega.3c05984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/21/2023] [Accepted: 10/17/2023] [Indexed: 11/17/2023]
Abstract
Chemical investigation for the mycelial extract of a saprotrophic fungus Lachnum sp. IW157 growing on the common reed grass Phragmites communis afforded the identification of two polyketide metabolites diaporphasines E (1) and F (2). Chemical structures of isolated compounds were unambiguously elucidated based on extensive 1D and 2D NMR spectral analyses in addition to their high-resolution mass spectrometry. The isolated compounds were assessed for their cytotoxicity and antimicrobial and biofilm inhibitory activities. While compound 1 revealed potent cytotoxicity against the tested cell lines L929 and KB3.1 with IC50 values of 0.9 and 3.7 μM, respectively, compound 2 exhibited moderate effects on the formation of S. aureus biofilms at 31.25 μg/mL.
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Affiliation(s)
- Kunthida Phutthacharoen
- Department
of Microbial Drugs, Helmholtz Centre for
Infection Research GmbH (HZI), Inhoffenstraße 7, Braunschweig 38124, Germany
- Center
of Excellence in Fungal Research, Mae Fah
Luang University, Chiang
Rai 57100, Thailand
- School
of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Syeda J. Khalid
- Department
of Microbial Drugs, Helmholtz Centre for
Infection Research GmbH (HZI), Inhoffenstraße 7, Braunschweig 38124, Germany
- Institute
of Microbiology, Technische Universität
Braunschweig, Spielmannstraße
7, Braunschweig 38106, Germany
| | - Hedda Schrey
- Department
of Microbial Drugs, Helmholtz Centre for
Infection Research GmbH (HZI), Inhoffenstraße 7, Braunschweig 38124, Germany
- Institute
of Microbiology, Technische Universität
Braunschweig, Spielmannstraße
7, Braunschweig 38106, Germany
| | - Kevin D. Hyde
- Center
of Excellence in Fungal Research, Mae Fah
Luang University, Chiang
Rai 57100, Thailand
- School
of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Marc Stadler
- Department
of Microbial Drugs, Helmholtz Centre for
Infection Research GmbH (HZI), Inhoffenstraße 7, Braunschweig 38124, Germany
- Institute
of Microbiology, Technische Universität
Braunschweig, Spielmannstraße
7, Braunschweig 38106, Germany
| | - Sherif S. Ebada
- Department
of Microbial Drugs, Helmholtz Centre for
Infection Research GmbH (HZI), Inhoffenstraße 7, Braunschweig 38124, Germany
- Department
of Pharmacognosy, Faculty of Pharmacy, Ain
Shams University, Cairo 11566, Egypt
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Avci FG, Tastekil I, Jaisi A, Ozbek Sarica P, Sariyar Akbulut B. A review on the mechanistic details of OXA enzymes of ESKAPE pathogens. Pathog Glob Health 2022; 117:219-234. [PMID: 35758005 PMCID: PMC10081068 DOI: 10.1080/20477724.2022.2088496] [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] [Indexed: 10/17/2022] Open
Abstract
The production of β-lactamases is a prevalent mechanism that poses serious pressure on the control of bacterial resistance. Furthermore, the unavoidable and alarming increase in the transmission of bacteria producing extended-spectrum β-lactamases complicates treatment alternatives with existing drugs and/or approaches. Class D β-lactamases, designated as OXA enzymes, are characterized by their activity specifically towards oxacillins. They are widely distributed among the ESKAPE bugs that are associated with antibiotic resistance and life-threatening hospital infections. The inadequacy of current β-lactamase inhibitors for conventional treatments of 'OXA' mediated infections confirms the necessity of new approaches. Here, the focus is on the mechanistic details of OXA-10, OXA-23, and OXA-48, commonly found in highly virulent and antibiotic-resistant pathogens Acinetobacter baumannii, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Enterobacter spp. to describe their similarities and differences. Furthermore, this review contains a specific emphasis on structural and computational perspectives, which will be valuable to guide efforts in the design/discovery of a common single-molecule drug against ESKAPE pathogens.
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Affiliation(s)
- Fatma Gizem Avci
- Bioengineering Department, Uskudar University, Uskudar, 34662, Turkey
| | - Ilgaz Tastekil
- Bioengineering Department, Marmara University, Kadikoy, 34722, Turkey
| | - Amit Jaisi
- Drug and Cosmetics Excellence Center, School of Pharmacy, Walailak University, 80160, Nakhon Si Thammarat, Thailand
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Guo Y, Yang Y, Xu X, Li L, Zhou Y, Jia G, Wei L, Yu Q, Wang J. Metallo-β-lactamases inhibitor fisetin attenuates meropenem resistance in NDM-1-producing Escherichia coli. Eur J Med Chem 2022; 231:114108. [DOI: 10.1016/j.ejmech.2022.114108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 01/06/2022] [Accepted: 01/07/2022] [Indexed: 11/30/2022]
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5
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Yun Y, Han S, Park YS, Park H, Kim D, Kim Y, Kwon Y, Kim S, Lee JH, Jeon JH, Lee SH, Kang LW. Structural Insights for Core Scaffold and Substrate Specificity of B1, B2, and B3 Metallo-β-Lactamases. Front Microbiol 2022; 12:752535. [PMID: 35095785 PMCID: PMC8792953 DOI: 10.3389/fmicb.2021.752535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 12/22/2021] [Indexed: 11/24/2022] Open
Abstract
Metallo-β-lactamases (MBLs) hydrolyze almost all β-lactam antibiotics, including penicillins, cephalosporins, and carbapenems; however, no effective inhibitors are currently clinically available. MBLs are classified into three subclasses: B1, B2, and B3. Although the amino acid sequences of MBLs are varied, their overall scaffold is well conserved. In this study, we systematically studied the primary sequences and crystal structures of all subclasses of MBLs, especially the core scaffold, the zinc-coordinating residues in the active site, and the substrate-binding pocket. We presented the conserved structural features of MBLs in the same subclass and the characteristics of MBLs of each subclass. The catalytic zinc ions are bound with four loops from the two central β-sheets in the conserved αβ/βα sandwich fold of MBLs. The three external loops cover the zinc site(s) from the outside and simultaneously form a substrate-binding pocket. In the overall structure, B1 and B2 MBLs are more closely related to each other than they are to B3 MBLs. However, B1 and B3 MBLs have two zinc ions in the active site, while B2 MBLs have one. The substrate-binding pocket is different among all three subclasses, which is especially important for substrate specificity and drug resistance. Thus far, various classes of β-lactam antibiotics have been developed to have modified ring structures and substituted R groups. Currently available structures of β-lactam-bound MBLs show that the binding of β-lactams is well conserved according to the overall chemical structure in the substrate-binding pocket. Besides β-lactam substrates, B1 and cross-class MBL inhibitors also have distinguished differences in the chemical structure, which fit well to the substrate-binding pocket of MBLs within their inhibitory spectrum. The systematic structural comparison among B1, B2, and B3 MBLs provides in-depth insight into their substrate specificity, which will be useful for developing a clinical inhibitor targeting MBLs.
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Affiliation(s)
- Yeongjin Yun
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Sangjun Han
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Yoon Sik Park
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Hyunjae Park
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Dogyeong Kim
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Yeseul Kim
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Yongdae Kwon
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Sumin Kim
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Jung Hun Lee
- National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, South Korea
| | - Jeong Ho Jeon
- National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, South Korea
| | - Sang Hee Lee
- National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, South Korea
- *Correspondence: Sang Hee Lee,
| | - Lin-Woo Kang
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
- Lin-Woo Kang,
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Orton H, Herath I, Maleckis A, Jabar S, Szabo M, Graham B, Breen C, Topping L, Butler S, Otting G. Localising individual atoms of tryptophan side chains in the metallo- β-lactamase IMP-1 by pseudocontact shifts from paramagnetic lanthanoid tags at multiple sites. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2022; 3:1-13. [PMID: 37905175 PMCID: PMC10583275 DOI: 10.5194/mr-3-1-2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 12/21/2021] [Indexed: 11/01/2023]
Abstract
The metallo-β -lactamase IMP-1 features a flexible loop near the active site that assumes different conformations in single crystal structures, which may assist in substrate binding and enzymatic activity. To probe the position of this loop, we labelled the tryptophan residues of IMP-1 with 7-13 C-indole and the protein with lanthanoid tags at three different sites. The magnetic susceptibility anisotropy (Δ χ ) tensors were determined by measuring pseudocontact shifts (PCSs) of backbone amide protons. The Δ χ tensors were subsequently used to identify the atomic coordinates of the tryptophan side chains in the protein. The PCSs were sufficient to determine the location of Trp28, which is in the active site loop targeted by our experiments, with high accuracy. Its average atomic coordinates showed barely significant changes in response to the inhibitor captopril. It was found that localisation spaces could be defined with better accuracy by including only the PCSs of a single paramagnetic lanthanoid ion for each tag and tagging site. The effect was attributed to the shallow angle with which PCS isosurfaces tend to intersect if generated by tags and tagging sites that are identical except for the paramagnetic lanthanoid ion.
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Affiliation(s)
- Henry W. Orton
- ARC Centre of Excellence for Innovations in Peptide & Protein
Science, Research School of Chemistry, Australian National University,
Canberra, ACT 2601, Australia
| | - Iresha D. Herath
- Research School of Chemistry, The Australian National University,
Sullivans Creek Road, Canberra ACT 2601, Australia
| | - Ansis Maleckis
- Latvian Institute of Organic Synthesis, Aizkraukles 21, 1006 Riga,
Latvia
| | - Shereen Jabar
- Research School of Chemistry, The Australian National University,
Sullivans Creek Road, Canberra ACT 2601, Australia
| | - Monika Szabo
- Monash Institute of Pharmaceutical Sciences, Monash University,
Parkville, VIC 3052, Australia
| | - Bim Graham
- Monash Institute of Pharmaceutical Sciences, Monash University,
Parkville, VIC 3052, Australia
| | - Colum Breen
- Department of Chemistry, Loughborough University, Epinal Way, Loughborough, LE11 3TU, United Kingdom
| | - Lydia Topping
- Department of Chemistry, Loughborough University, Epinal Way, Loughborough, LE11 3TU, United Kingdom
| | - Stephen J. Butler
- Department of Chemistry, Loughborough University, Epinal Way, Loughborough, LE11 3TU, United Kingdom
| | - Gottfried Otting
- ARC Centre of Excellence for Innovations in Peptide & Protein
Science, Research School of Chemistry, Australian National University,
Canberra, ACT 2601, Australia
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7
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Bahr G, González LJ, Vila AJ. Metallo-β-lactamases in the Age of Multidrug Resistance: From Structure and Mechanism to Evolution, Dissemination, and Inhibitor Design. Chem Rev 2021; 121:7957-8094. [PMID: 34129337 PMCID: PMC9062786 DOI: 10.1021/acs.chemrev.1c00138] [Citation(s) in RCA: 96] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Antimicrobial resistance is one of the major problems in current practical medicine. The spread of genes coding for resistance determinants among bacteria challenges the use of approved antibiotics, narrowing the options for treatment. Resistance to carbapenems, last resort antibiotics, is a major concern. Metallo-β-lactamases (MBLs) hydrolyze carbapenems, penicillins, and cephalosporins, becoming central to this problem. These enzymes diverge with respect to serine-β-lactamases by exhibiting a different fold, active site, and catalytic features. Elucidating their catalytic mechanism has been a big challenge in the field that has limited the development of useful inhibitors. This review covers exhaustively the details of the active-site chemistries, the diversity of MBL alleles, the catalytic mechanism against different substrates, and how this information has helped developing inhibitors. We also discuss here different aspects critical to understand the success of MBLs in conferring resistance: the molecular determinants of their dissemination, their cell physiology, from the biogenesis to the processing involved in the transit to the periplasm, and the uptake of the Zn(II) ions upon metal starvation conditions, such as those encountered during an infection. In this regard, the chemical, biochemical and microbiological aspects provide an integrative view of the current knowledge of MBLs.
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Affiliation(s)
- Guillermo Bahr
- Instituto de Biología Molecular y Celular de Rosario (IBR), CONICET, Universidad Nacional de Rosario, Ocampo y Esmeralda S/N, 2000 Rosario, Argentina
- Area Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
| | - Lisandro J. González
- Instituto de Biología Molecular y Celular de Rosario (IBR), CONICET, Universidad Nacional de Rosario, Ocampo y Esmeralda S/N, 2000 Rosario, Argentina
- Area Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
| | - Alejandro J. Vila
- Instituto de Biología Molecular y Celular de Rosario (IBR), CONICET, Universidad Nacional de Rosario, Ocampo y Esmeralda S/N, 2000 Rosario, Argentina
- Area Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina
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8
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Egorov AM, Ulyashova MM, Rubtsova MY. Inhibitors of β-Lactamases. New Life of β-Lactam Antibiotics. BIOCHEMISTRY (MOSCOW) 2021; 85:1292-1309. [PMID: 33280574 DOI: 10.1134/s0006297920110024] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
β-Lactam antibiotics account for about 60% of all produced antibiotics. Due to a high activity and minimal side effects, they are the most commonly used class of antibacterial drugs for the treatment of various infectious diseases of humans and animals, including severe hospital infections. However, the emergence of bacteria resistant to β-lactams has led to the clinical inefficiency of these antibiotics, and as a result, their use in medicine has been limited. The search for new effective ways for overcoming the resistance to β-lactam antibiotics is an essential task. The major mechanism of bacterial resistance is the synthesis of β-lactamases (BLs) that break the antibiotic β-lactam ring. Here, we review specific inhibitors of serine β-lactamases and metallo-β-lactamases and discuss approaches for creating new inhibitors that would prolong the "life" of β-lactams.
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Affiliation(s)
- A M Egorov
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - M M Ulyashova
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - M Yu Rubtsova
- Faculty of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia.
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9
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Yan Y, Li G, Li G. Principles and current strategies targeting metallo‐β‐lactamase mediated antibacterial resistance. Med Res Rev 2020; 40:1558-1592. [PMID: 32100311 DOI: 10.1002/med.21665] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 12/18/2019] [Accepted: 02/11/2020] [Indexed: 12/24/2022]
Affiliation(s)
- Yu‐Hang Yan
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant‐Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of PharmacySichuan UniversityChengdu Sichuan China
| | - Gen Li
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant‐Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of PharmacySichuan UniversityChengdu Sichuan China
| | - Guo‐Bo Li
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant‐Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of PharmacySichuan UniversityChengdu Sichuan China
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10
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Discovery of [1,2,4]Triazole Derivatives as New Metallo-β-Lactamase Inhibitors. Molecules 2019; 25:molecules25010056. [PMID: 31877988 PMCID: PMC6982996 DOI: 10.3390/molecules25010056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/16/2019] [Accepted: 12/17/2019] [Indexed: 01/08/2023] Open
Abstract
The emergence and spread of metallo-β-lactamase (MBL)-mediated resistance to β-lactam antibacterials has already threatened the global public health. A clinically useful MBL inhibitor that can reverse β-lactam resistance has not been established yet. We here report a series of [1,2,4]triazole derivatives and analogs, which displayed inhibition to the clinically relevant subclass B1 (Verona integron-encoded MBL-2) VIM-2. 3-(4-Bromophenyl)-6,7-dihydro-5H-[1,2,4]triazolo [3,4-b][1,3]thiazine (5l) manifested the most potent inhibition with an IC50 (half-maximal inhibitory concentration) value of 38.36 μM. Investigations of 5l against other B1 MBLs and the serine β-lactamases (SBLs) revealed the selectivity to VIM-2. Molecular docking analyses suggested that 5l bound to the VIM-2 active site via the triazole involving zinc coordination and made hydrophobic interactions with the residues Phe61 and Tyr67 on the flexible L1 loop. This work provided new triazole-based MBL inhibitors and may aid efforts to develop new types of inhibitors combating MBL-mediated resistance.
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Cercospora sp. as a source of anti-aging polyketides targeting 26S proteasome and scale-up production in submerged bioreactor. J Biotechnol 2019; 301:88-96. [PMID: 31152756 DOI: 10.1016/j.jbiotec.2019.05.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/14/2019] [Accepted: 05/27/2019] [Indexed: 12/31/2022]
Abstract
From a large screening of microbial extracts for the discovery of proteasome modulating natural products, the fungal strain Cercospora sp. (CF-223709) was selected as the most promising for further investigation. Different liquid cultures of the strain were initially screened for their anti-oxidant activity (DPPH, ABTS) and for their cytotoxicity against the A2058, HepG2 and CCD25sk cell lines. A detailed chemical analysis and evaluation of the capacity to activate 26S-proteasome was followed for the most active extract. Three main polyketides were isolated and characterized by extensive analysis of NMR and HRMS spectra data as penialidine F (1), fulvic acid (2), and SB238569 (3). Fulvic acid showed the most significant anti-oxidant activity. Its IC50 value (8.16 μM) against the ABTS radical resulted 3-fold lower than the standard trolox. Fulvic acid also demonstrated a significant effect on proteasome by enhancing the chymotrypsin- and caspase-like activities of the 26S proteasome of human fibroblasts by 71.43% and 37.5% at 1 μM, respectively. Furthermore by scaling up the culture in a 30 L submerged bioreactor, Cercospora sp. produced up to 162.6 ± 1.3 mg of fulvic acid/L. Our findings suggest that CF-223709 can be a promising source of proteasome activating natural compounds.
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12
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Varela MF, Kumar S. Strategies for discovery of new molecular targets for anti-infective drugs. Curr Opin Pharmacol 2019; 48:57-68. [PMID: 31146204 DOI: 10.1016/j.coph.2019.04.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/18/2019] [Accepted: 04/20/2019] [Indexed: 12/29/2022]
Abstract
Multidrug resistant bacterial pathogens as causative agents of infectious disease are a primary public health concern. Clinical efficacy of antimicrobial chemotherapy toward bacterial infection has been compromised in cases where causative agents are resistant to multiple structurally distinct antimicrobial agents. Modification of extant antimicrobial agents that exploit conventional bacterial targets have been developed since the advent of the antimicrobial era. This approach, while successful in certain cases, nonetheless suffers overall from the costs of development and rapid emergence of bacterial variants with confounding resistances to modified agents. Thus, additional strategies toward discovery of new molecular targets have been developed based on bioinformatics analyses and comparative genomics. These and other strategies meant to identify new molecular targets represent promising avenues for reducing emergence of bacterial infections. This short review considers these strategies for discovery of new molecular targets within bacterial pathogens.
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Affiliation(s)
- Manuel F Varela
- Department of Biology, Eastern New Mexico University, Portales, NM 88130, USA.
| | - Sanath Kumar
- Post Harvest Technology, ICAR-Central Institute of Fisheries Education, Seven Bungalows, Andheri (W), Mumbai, 400016, India
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14
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Flupyranochromene, a novel inhibitor of influenza virus cap-dependent endonuclease, from Penicillium sp. f28743. J Antibiot (Tokyo) 2019; 72:125-133. [DOI: 10.1038/s41429-018-0134-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/12/2018] [Accepted: 11/30/2018] [Indexed: 11/08/2022]
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15
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Kaye PT, Molefe DM, Nchinda AT, Sabbagh LV. Chromone studies. Part 15. Formation and condensation of Baylis–Hillman adducts in DABCO-catalysed reactions of chromone-3-carbaldehydes with acrylonitrile. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/0308234041209068] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
1,4-Diazabicyclo[2.2.2]octane(DABCO)-catalysed reactions of selected chromone-3-carbaldehydes with acrylonitrile (or methyl vinyl ketone) have led to the formation of Baylis–Hillman adducts and, in some cases, novel polycyclic condensation derivatives; electron-impact and electrospray MS fragmentation patterns have been examined for selected products.
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Affiliation(s)
- Perry T. Kaye
- Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa
| | - Duduzile M. Molefe
- Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa
| | | | - Liezel V. Sabbagh
- Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa
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16
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Somboro AM, Osei Sekyere J, Amoako DG, Kumalo HM, Khan R, Bester LA, Essack SY. In vitro potentiation of carbapenems with tannic acid against carbapenemase-producing enterobacteriaceae: exploring natural products as potential carbapenemase inhibitors. J Appl Microbiol 2018; 126:452-467. [PMID: 30365206 DOI: 10.1111/jam.14141] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 10/17/2018] [Accepted: 10/19/2018] [Indexed: 02/03/2023]
Abstract
AIMS We hypothesized and confirmed that tannic acid (TA) reverses carbapenem resistance by inhibiting carbapenemases in class A and B carbapenemase-producing Enterobacteriaceae. METHODS AND RESULTS Minimum inhibitory concentrations of carbapenems in the presence and absence of TA and other efflux pump inhibitors, TA-carbapenemases inhibition assays and computational studies showed that TA had the greatest effect on metallo-β-lactamases (MBLs) followed by class A serine-β-lactamases (SBLs). TA completely reversed the MICs of MBL producers from between 32 and ≥512 mg l-1 to susceptible values (<4 mg l-1 ) while substantially reducing the MICs of SBLs from between 16 and >512 mg l-1 to <4 to 16 mg l-1 . Tolerable cytotoxic effect was observed for the concentrations tested (8-1024 mg l-1 ). TA inhibited enzymes with a marked difference of ≈50% inhibition (IC50 ) for NDM-1 (270 μmol l-1 ) and KPC-2 (15 μmol l-1 ). CONCLUSION TA inhibited both MBLs and SBLs by targeting their hydrophobic sites. Moreover, TA had a stronger binding affinity for MBLs than SBLs as the MBLs, specifically VIM-1 (-43·7220 ± 0·4513 kcal mol-1 ) and NDM-1(-44·2329 ± 0·3806 kcal mol-1 ), interact with a larger number of their catalytic active-site residues than that of OXA-48 (-22·5275 ± 0·1300 kcal mol-1 ) and KPC-2 (-22·1164 ± 0·0111 kcal mol-1 ). SIGNIFICANCE AND IMPACT OF THE STUDY Tannic acid or its analogues could be developed into carbapenemase-inhibiting adjuvants to restore carbapenem activity in CRE infections, save many lives and reduce healthcare associated costs.
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Affiliation(s)
- A M Somboro
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.,Biomedical Resource Unit, School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - J Osei Sekyere
- Department of Medical Microbiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - D G Amoako
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - H M Kumalo
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa
| | - R Khan
- Discipline of Medical Biochemistry, School of Laboratory Medicine and Medical Science, University of KwaZulu-Natal, Durban, South Africa
| | - L A Bester
- Biomedical Resource Unit, School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - S Y Essack
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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17
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Somboro AM, Osei Sekyere J, Amoako DG, Essack SY, Bester LA. Diversity and Proliferation of Metallo-β-Lactamases: a Clarion Call for Clinically Effective Metallo-β-Lactamase Inhibitors. Appl Environ Microbiol 2018; 84:e00698-18. [PMID: 30006399 PMCID: PMC6121990 DOI: 10.1128/aem.00698-18] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The worldwide proliferation of life-threatening metallo-β-lactamase (MBL)-producing Gram-negative bacteria is a serious concern to public health. MBLs are compromising the therapeutic efficacies of β-lactams, particularly carbapenems, which are last-resort antibiotics indicated for various multidrug-resistant bacterial infections. Inhibition of enzymes mediating antibiotic resistance in bacteria is one of the major promising means for overcoming bacterial resistance. Compounds having potential MBL-inhibitory activity have been reported, but none are currently under clinical trials. The need for developing safe and efficient MBL inhibitors (MBLIs) is obvious, particularly with the continuous spread of MBLs worldwide. In this review, the emergence and escalation of MBLs in Gram-negative bacteria are discussed. The relationships between different class B β-lactamases identified up to 2017 are represented by a phylogenetic tree and summarized. In addition, approved and/or clinical-phase serine β-lactamase inhibitors are recapitulated to reflect the successful advances made in developing class A β-lactamase inhibitors. Reported MBLIs, their inhibitory properties, and their purported modes of inhibition are delineated. Insights into structural variations of MBLs and the challenges involved in developing potent MBLIs are also elucidated and discussed. Currently, natural products and MBL-resistant β-lactam analogues are the most promising agents that can become clinically efficient MBLIs. A deeper comprehension of the mechanisms of action and activity spectra of the various MBLs and their inhibitors will serve as a bedrock for further investigations that can result in clinically useful MBLIs to curb this global menace.
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Affiliation(s)
- Anou M Somboro
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
- Biomedical Resource Unit, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - John Osei Sekyere
- Department of Medical Microbiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Daniel G Amoako
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
- Biomedical Resource Unit, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Sabiha Y Essack
- Antimicrobial Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Linda A Bester
- Biomedical Resource Unit, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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18
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Ouyang X, Chang YN, Yang KW, Wang WM, Bai JJ, Wang JW, Zhang YJ, Wang SY, Xie BB, Wang LL. A DNA nanoribbon as a potent inhibitor of metallo-β-lactamases. Chem Commun (Camb) 2018; 53:8878-8881. [PMID: 28737795 DOI: 10.1039/c7cc04483f] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We discovered a promising metallo-β-lactamase inhibitor, a DNA nanoribbon, by enzymatic kinetics and isothermal titration calorimetry evaluations. Atomic force microscopy, gel electrophoresis, competitive binding experiments, circular dichroic and thermal denaturation studies suggested that the DNA nanoribbon could bind to the enzyme through a minor groove.
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Affiliation(s)
- Xiangyuan Ouyang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education of China, Key Laboratory of Modern Separation Science in Shaanxi Province, College of Chemistry & Material Science, Northwest University, Xi'an, 710127, China.
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19
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Hinchliffe P, Tanner CA, Krismanich AP, Labbé G, Goodfellow VJ, Marrone L, Desoky AY, Calvopiña K, Whittle EE, Zeng F, Avison MB, Bols NC, Siemann S, Spencer J, Dmitrienko GI. Structural and Kinetic Studies of the Potent Inhibition of Metallo-β-lactamases by 6-Phosphonomethylpyridine-2-carboxylates. Biochemistry 2018; 57:1880-1892. [PMID: 29485857 PMCID: PMC6007964 DOI: 10.1021/acs.biochem.7b01299] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
There are currently no clinically available inhibitors of metallo-β-lactamases (MBLs), enzymes that hydrolyze β-lactam antibiotics and confer resistance to Gram-negative bacteria. Here we present 6-phosphonomethylpyridine-2-carboxylates (PMPCs) as potent inhibitors of subclass B1 (IMP-1, VIM-2, and NDM-1) and B3 (L1) MBLs. Inhibition followed a competitive, slow-binding model without an isomerization step (IC50 values of 0.3-7.2 μM; Ki values of 0.03-1.5 μM). Minimum inhibitory concentration assays demonstrated potentiation of β-lactam (Meropenem) activity against MBL-producing bacteria, including clinical isolates, at concentrations at which eukaryotic cells remain viable. Crystal structures revealed unprecedented modes of binding of inhibitor to B1 (IMP-1) and B3 (L1) MBLs. In IMP-1, binding does not replace the nucleophilic hydroxide, and the PMPC carboxylate and pyridine nitrogen interact closely (2.3 and 2.7 Å, respectively) with the Zn2 ion of the binuclear metal site. The phosphonate group makes limited interactions but is 2.6 Å from the nucleophilic hydroxide. Furthermore, the presence of a water molecule interacting with the PMPC phosphonate and pyridine N-C2 π-bond, as well as the nucleophilic hydroxide, suggests that the PMPC binds to the MBL active site as its hydrate. Binding is markedly different in L1, with the phosphonate displacing both Zn2, forming a monozinc enzyme, and the nucleophilic hydroxide, while also making multiple interactions with the protein main chain and Zn1. The carboxylate and pyridine nitrogen interact with Ser221 and -223, respectively (3 Å distance). The potency, low toxicity, cellular activity, and amenability to further modification of PMPCs indicate these and similar phosphonate compounds can be further considered for future MBL inhibitor development.
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Affiliation(s)
- Philip Hinchliffe
- School of Cellular & Molecular Medicine , University of Bristol , Bristol BS8 1TD , U.K
| | - Carol A Tanner
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Anthony P Krismanich
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Geneviève Labbé
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Valerie J Goodfellow
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Laura Marrone
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Ahmed Y Desoky
- Department of Chemistry, College of Science , University of Hail , Saudi Arabia
| | - Karina Calvopiña
- School of Cellular & Molecular Medicine , University of Bristol , Bristol BS8 1TD , U.K
| | - Emily E Whittle
- School of Cellular & Molecular Medicine , University of Bristol , Bristol BS8 1TD , U.K
| | - Fanxing Zeng
- Department of Biology , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Matthew B Avison
- School of Cellular & Molecular Medicine , University of Bristol , Bristol BS8 1TD , U.K
| | - Niels C Bols
- Department of Biology , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
| | - Stefan Siemann
- Department of Chemistry and Biochemistry , Laurentian University , Sudbury , Ontario , Canada P3E 2C6
| | - James Spencer
- School of Cellular & Molecular Medicine , University of Bristol , Bristol BS8 1TD , U.K
| | - Gary I Dmitrienko
- Department of Chemistry , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1.,School of Pharmacy , University of Waterloo , Waterloo , Ontario , Canada N2L 3G1
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20
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Ding B, Wang Z, Xia G, Huang X, Xu F, Chen W, She Z. Three New Chromone Derivatives Produced by Phomopsis
sp. HNY29-2B from Acanthus ilicifolius
Linn. CHINESE J CHEM 2017. [DOI: 10.1002/cjoc.201700375] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Bo Ding
- School of Chemistry; Sun Yat-Sen University; Guangzhou Guangdong 510275 China
- Guangdong Inspection and Quarantine Technology Center; Guangdong Entry-Exit Inspection and Quarantine; Bureau Guangzhou, Guangdong 510623 China
| | - Zhiyuan Wang
- Guangdong Inspection and Quarantine Technology Center; Guangdong Entry-Exit Inspection and Quarantine; Bureau Guangzhou, Guangdong 510623 China
| | - Guoping Xia
- School of Chemistry; Sun Yat-Sen University; Guangzhou Guangdong 510275 China
| | - Xishan Huang
- School of Chemistry; Sun Yat-Sen University; Guangzhou Guangdong 510275 China
| | - Fang Xu
- Institute of Tumor Pharmacology, College of Pharmacy; Jinan University; Guangzhou Guangdong 510632 China
| | - Wenrui Chen
- Guangdong Inspection and Quarantine Technology Center; Guangdong Entry-Exit Inspection and Quarantine; Bureau Guangzhou, Guangdong 510623 China
| | - Zhigang She
- School of Chemistry; Sun Yat-Sen University; Guangzhou Guangdong 510275 China
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21
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22
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One-pot Synthesis of 6-Aza-chromone Derivatives Through Cascade Carbonylation-Sonogashira-Cyclization. Sci Rep 2017; 7:4398. [PMID: 28667287 PMCID: PMC5493695 DOI: 10.1038/s41598-017-04693-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/18/2017] [Indexed: 11/09/2022] Open
Abstract
We developed an efficient synthesis of aza-chromones from 3-iodo-4-(1H)-pyridones and terminal acetylenes via a cascade carbonylation-Sonogashira-cyclization reaction. By controlling the use of bases, both 6-aza-chromones 5 and 3-(4-oxo-1,4-dihydroquinoline-3-carbonyl)-4H-pyrano[3,2-c]quinolin-4-ones 6 could be selectively obtained in moderate to good yields.
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23
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Mao XF, Zhu XP, Li DY, Liu PN. Cu-Catalyzed Cascade Annulation of Alkynols with 2-Azidobenzaldehydes: Access to 6H-Isochromeno[4,3-c]quinoline. J Org Chem 2017; 82:7032-7039. [PMID: 28553980 DOI: 10.1021/acs.joc.7b00937] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A copper-catalyzed cascade reaction of alkynols and 2-azidobenzaldehydes has been achieved, giving 6H-isochromeno[4,3-c]quinoline in yields of 40-81%. This reaction provides a novel, concise strategy for rapidly constructing compounds with fused N- and O-containing heterocycles. In contrast to previously reported reactions of alkynols in which the first step is intramolecular cycloisomerization, the first step in this novel reaction of alkynols is entropically unfavorable intermolecular addition. The resulting hemiacetal intermediate then undergoes intramolecular cyclization and aromatization to afford the product.
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Affiliation(s)
- Xiao-Feng Mao
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Lab for Advanced Materials and School of Chemistry and Molecular Engineering, East China University of Science and Technology , Meilong Road 130, Shanghai 200237, China
| | - Xiao-Ping Zhu
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Lab for Advanced Materials and School of Chemistry and Molecular Engineering, East China University of Science and Technology , Meilong Road 130, Shanghai 200237, China
| | - Deng-Yuan Li
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Lab for Advanced Materials and School of Chemistry and Molecular Engineering, East China University of Science and Technology , Meilong Road 130, Shanghai 200237, China
| | - Pei-Nian Liu
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Lab for Advanced Materials and School of Chemistry and Molecular Engineering, East China University of Science and Technology , Meilong Road 130, Shanghai 200237, China
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24
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Sevaille L, Gavara L, Bebrone C, De Luca F, Nauton L, Achard M, Mercuri P, Tanfoni S, Borgianni L, Guyon C, Lonjon P, Turan-Zitouni G, Dzieciolowski J, Becker K, Bénard L, Condon C, Maillard L, Martinez J, Frère JM, Dideberg O, Galleni M, Docquier JD, Hernandez JF. 1,2,4-Triazole-3-thione Compounds as Inhibitors of Dizinc Metallo-β-lactamases. ChemMedChem 2017; 12:972-985. [DOI: 10.1002/cmdc.201700186] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/12/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Laurent Sevaille
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
| | - Laurent Gavara
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
| | - Carine Bebrone
- Laboratoire de Macromolécules Biologiques, Centre d'Ingénierie des Protéines; Université de Liège; Allée du 6 août B6, Sart-Tilman 4000 Liège Belgium
- Present address: Symbiose Biomaterials S.A., GIGA Bât. B34; 1 avenue de l'Hôpital 4000 Liège Belgium
| | - Filomena De Luca
- Dipartimento di Biotecnologie Mediche; Università di Siena; 53100 Siena Italy
| | - Lionel Nauton
- Institut de Biologie Structurale-Jean-Pierre Ebel, UMR5075 CNRS, CEA; Université Joseph Fourier; 41 rue Jules Horowitz 38027 Grenoble cedex 1 France
- Present address: Institut de Chimie de Clermont-Ferrand, UMR6296 CNRS; Université Clermont Auvergne; 63000 Clermont-Ferrand France
| | - Maud Achard
- EMBL Outstation c/o DESY; Notkestrasse 85 22603 Hamburg Germany
- Present address: School of Chemistry and Molecular Bioscience; University of Queensland, St. Lucia; Brisbane QLD 4072 Australia
| | - Paola Mercuri
- Laboratoire de Macromolécules Biologiques, Centre d'Ingénierie des Protéines; Université de Liège; Allée du 6 août B6, Sart-Tilman 4000 Liège Belgium
| | - Silvia Tanfoni
- Dipartimento di Biotecnologie Mediche; Università di Siena; 53100 Siena Italy
| | - Luisa Borgianni
- Dipartimento di Biotecnologie Mediche; Università di Siena; 53100 Siena Italy
| | - Carole Guyon
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
| | - Pauline Lonjon
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
- Present address: CERN, HSE/SEE/SI; 1211 Geneva 23 Switzerland
| | - Gülhan Turan-Zitouni
- Department of Pharmaceutical Chemistry; Anadolu University, Faculty of Pharmacy; 26470 Eskisehir Turkey
| | - Julia Dzieciolowski
- Chair of Biochemistry and Molecular Biology, Interdisciplinary Research Center; Justus Liebig University; Heinrich-Buff-Ring 26-32 35392 Giessen Germany
| | - Katja Becker
- Chair of Biochemistry and Molecular Biology, Interdisciplinary Research Center; Justus Liebig University; Heinrich-Buff-Ring 26-32 35392 Giessen Germany
| | - Lionel Bénard
- UMR8226, CNRS, Université Pierre et Marie Curie; Institut de Biologie Physico-Chimique; 13 rue Pierre et Marie Curie 75005 Paris France
| | - Ciaran Condon
- UMR8261, CNRS, Université Paris-Diderot; Institut de Biologie Physico-Chimique; 13 rue Pierre et Marie Curie 75005 Paris France
| | - Ludovic Maillard
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
| | - Jean Martinez
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
| | - Jean-Marie Frère
- Laboratoire de Macromolécules Biologiques, Centre d'Ingénierie des Protéines; Université de Liège; Allée du 6 août B6, Sart-Tilman 4000 Liège Belgium
| | - Otto Dideberg
- Institut de Biologie Structurale-Jean-Pierre Ebel, UMR5075 CNRS, CEA; Université Joseph Fourier; 41 rue Jules Horowitz 38027 Grenoble cedex 1 France
| | - Moreno Galleni
- Laboratoire de Macromolécules Biologiques, Centre d'Ingénierie des Protéines; Université de Liège; Allée du 6 août B6, Sart-Tilman 4000 Liège Belgium
| | - Jean-Denis Docquier
- Dipartimento di Biotecnologie Mediche; Università di Siena; 53100 Siena Italy
| | - Jean-François Hernandez
- Institut des Biomolécules Max Mousseron, UMR5247 CNRS; Université de Montpellier, ENSCM, Faculté de Pharmacie; 15 avenue Charles Flahault 34093 Montpellier cedex 5 France
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25
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Cui H, Ding M, Huang D, Zhang Z, Liu H, Huang H, She Z. Chroman-4-one and pyrano[4,3-b]chromenone derivatives from the mangrove endophytic fungus Diaporthe phaseolorum SKS019. RSC Adv 2017. [DOI: 10.1039/c7ra03032k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Seven new compounds: diaporchromanones A–D (1–4), (−)-phomopsichin A (5a), (+)-phomopsichin B (6a), and (±)-diaporchromone A (7), along with the known (+)-phomopsichin A (5b) and (−)-phomopsichin B (6b) were isolated from an endophytic fungus Diaporthe phaseolorum SKS019.
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Affiliation(s)
- Hui Cui
- School of Chemistry
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Meng Ding
- School of Chemistry
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Dane Huang
- School of Pharmaceutical Sciences
- Sun Yat-Sen University
- Guangzhou 510080
- China
| | - Zhengrui Zhang
- School of Chemistry
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Huiting Liu
- School of Chemistry
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Hongbo Huang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
- Guangdong Key Laboratory of Marine Materia Medica
- South China Sea Institute of Oceanology
- Chinese Academy of Sciences
- Guangzhou 510301
| | - Zhigang She
- School of Chemistry
- Sun Yat-Sen University
- Guangzhou 510275
- China
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26
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Huang M, Li J, Liu L, Yin S, Wang J, Lin Y. Phomopsichin A-D; Four New Chromone Derivatives from Mangrove Endophytic Fungus Phomopsis sp. 33. Mar Drugs 2016; 14:E215. [PMID: 27879655 PMCID: PMC5128758 DOI: 10.3390/md14110215] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/20/2016] [Accepted: 11/08/2016] [Indexed: 11/23/2022] Open
Abstract
Four new chromone derivatives, phomopsichins A-D (1-4), along with a known compound, phomoxanthone A (5), were isolated from the fermentation products of mangrove endophytic fungus Phomopsis sp. 33#. Their structures were elucidated based on comprehensive spectroscopic analysis coupled with single-crystal X-ray diffraction or theoretical calculations of electronic circular dichroism (ECD). They feature a tricyclic framework, in which a dihydropyran ring is fused with the chromone ring. Compounds 1-5 showed weak inhibitory activities on acetylcholinesterase as well as α-glucosidase, weak radical scavenging effects on 1,1-diphenyl-2-picrylhydrazyl (DPPH) as well as OH, and weak antimicrobial activities. Compounds 1-4 showed no cytotoxic activity against MDA-MB-435 breast cancer cells. Their other bioactivities are worthy of further study, considering their unique molecular structures.
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Affiliation(s)
- Meixiang Huang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.
| | - Jing Li
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.
- Key Laboratory of Functional Molecules from Oceanic Microorganisms (Sun Yat-sen University), Department of Education of Guangdong Province, Guangzhou 510080, China.
| | - Lan Liu
- School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.
- South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China.
| | - Sheng Yin
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.
| | - Jun Wang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.
| | - Yongcheng Lin
- Key Laboratory of Functional Molecules from Oceanic Microorganisms (Sun Yat-sen University), Department of Education of Guangdong Province, Guangzhou 510080, China.
- South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China.
- School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.
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27
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Akone SH, Mándi A, Kurtán T, Hartmann R, Lin W, Daletos G, Proksch P. Inducing secondary metabolite production by the endophytic fungus Chaetomium sp. through fungal–bacterial co-culture and epigenetic modification. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.08.022] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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28
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Montagner C, Nigen M, Jacquin O, Willet N, Dumoulin M, Karsisiotis AI, Roberts GCK, Damblon C, Redfield C, Matagne A. The Role of Active Site Flexible Loops in Catalysis and of Zinc in Conformational Stability of Bacillus cereus 569/H/9 β-Lactamase. J Biol Chem 2016; 291:16124-37. [PMID: 27235401 DOI: 10.1074/jbc.m116.719005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Indexed: 11/06/2022] Open
Abstract
Metallo-β-lactamases catalyze the hydrolysis of most β-lactam antibiotics and hence represent a major clinical concern. The development of inhibitors for these enzymes is complicated by the diversity and flexibility of their substrate-binding sites, motivating research into their structure and function. In this study, we examined the conformational properties of the Bacillus cereus β-lactamase II in the presence of chemical denaturants using a variety of biochemical and biophysical techniques. The apoenzyme was found to unfold cooperatively, with a Gibbs free energy of stabilization (ΔG(0)) of 32 ± 2 kJ·mol(-1) For holoBcII, a first non-cooperative transition leads to multiple interconverting native-like states, in which both zinc atoms remain bound in an apparently unaltered active site, and the protein displays a well organized compact hydrophobic core with structural changes confined to the enzyme surface, but with no catalytic activity. Two-dimensional NMR data revealed that the loss of activity occurs concomitantly with perturbations in two loops that border the enzyme active site. A second cooperative transition, corresponding to global unfolding, is observed at higher denaturant concentrations, with ΔG(0) value of 65 ± 1.4 kJ·mol(-1) These combined data highlight the importance of the two zinc ions in maintaining structure as well as a relatively well defined conformation for both active site loops to maintain enzymatic activity.
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Affiliation(s)
- Caroline Montagner
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
| | - Michaël Nigen
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
| | - Olivier Jacquin
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
| | - Nicolas Willet
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
| | - Mireille Dumoulin
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
| | - Andreas Ioannis Karsisiotis
- the School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, United Kingdom
| | - Gordon C K Roberts
- the Henry Wellcome Laboratories of Structural Biology, Department of Biochemistry, University of Leicester, Leicester LE1 9HN, United Kingdom, and
| | - Christian Damblon
- Département de Chimie, Université de Liège, Institut de Chimie B6, 4000 Liège (Sart Tilman), Belgium
| | - Christina Redfield
- the Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - André Matagne
- From the Laboratoire d'Enzymologie et Repliement des Protéines, Centre d'Ingénierie des Protéines, and
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González MM, Vila AJ. An Elusive Task: A Clinically Useful Inhibitor of Metallo-β-Lactamases. TOPICS IN MEDICINAL CHEMISTRY 2016. [DOI: 10.1007/7355_2016_6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Solution structures of the Bacillus cereus metallo-β-lactamase BcII and its complex with the broad spectrum inhibitor R-thiomandelic acid. Biochem J 2015; 456:397-407. [PMID: 24059435 PMCID: PMC3898119 DOI: 10.1042/bj20131003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metallo-β-lactamases, enzymes which inactivate β-lactam antibiotics, are of increasing biological and clinical significance as a source of antibiotic resistance in pathogenic bacteria. In the present study we describe the high-resolution solution NMR structures of the Bacillus cereus metallo-β-lactamase BcII and of its complex with R-thiomandelic acid, a broad-spectrum inhibitor of metallo-β-lactamases. This is the first reported solution structure of any metallo-β-lactamase. There are differences between the solution structure of the free enzyme and previously reported crystal structures in the loops flanking the active site, which are important for substrate and inhibitor binding and catalysis. The binding of R-thiomandelic acid and the roles of active-site residues are defined in detail. Changes in the enzyme structure upon inhibitor binding clarify the role of the mobile β3–β4 loop. Comparisons with other metallo-β-lactamases highlight the roles of individual amino-acid residues in the active site and the β3–β4 loop in inhibitor binding and provide information on the basis of structure–activity relationships among metallo-β-lactamase inhibitors. Metallo-β-lactamases are important in antibiotic resistance in micro-organisms. We report the first solution structure of a metallo-β-lactamase and its complex with an inhibitor, allowing the key flexible loops flanking the active site and their role in inhibitor binding to be properly defined.
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Kabbaj FZ, Lu S, Faouzi MEA, Meddah B, Proksch P, Cherrah Y, Altenbach HJ, Aly AH, Chadli A, Debbab A. Bioactive metabolites from Chaetomium aureum: structure elucidation and inhibition of the Hsp90 machine chaperoning activity. Bioorg Med Chem 2014; 23:126-31. [PMID: 25482429 DOI: 10.1016/j.bmc.2014.11.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 10/22/2014] [Accepted: 11/13/2014] [Indexed: 12/22/2022]
Abstract
Chemical investigation of the EtOAc extract of the fungus Chaetomium aureum, an endophyte of the Moroccan medicinal plant Thymelaea lythroides, afforded one new resorcinol derivative named chaetorcinol, together with five known metabolites. The structures of the isolated compounds were determined on the basis of one- and two-dimensional NMR spectroscopy and high-resolution mass spectrometry as well as by comparison with the literature. All compounds were tested for their activity towards the Hsp90 chaperoning machine in vitro using the progesterone receptor (PR) and rabbit reticulocyte lysate (RRL). Among the isolated compounds, only sclerotiorin efficiently inhibited the Hsp90 machine chaperoning activity. However, sclerotiorin showed no cytotoxic effect on breast cancer Hs578T, MDA-MB-231 and prostate cancer LNCaP cell lines. Interestingly, deacetylation of sclerotiorin increased its cytotoxicity toward the tested cell lines over a period of 48 h.
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Affiliation(s)
- Fatima Zahra Kabbaj
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-University Düsseldorf, Universitätsstr. 1, Building 26.23, 40225 Düsseldorf, Germany; Laboratory of Pharmacology and Toxicology, University Mohammed V Souissi, Rabat, Morocco; Department of Organic Chemistry, University of Wuppertal, Gaußstr. 20, 42097 Wuppertal, Germany
| | - Su Lu
- Cancer Research Center, Molecular Chaperones Biology, Georgia Regents University, 1410 Laney Walker Blvd, CN-3151, Augusta, GA 30912, United States
| | - My El Abbés Faouzi
- Laboratory of Pharmacology and Toxicology, University Mohammed V Souissi, Rabat, Morocco
| | - Bouchra Meddah
- Laboratory of Pharmacology and Toxicology, University Mohammed V Souissi, Rabat, Morocco
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-University Düsseldorf, Universitätsstr. 1, Building 26.23, 40225 Düsseldorf, Germany
| | - Yahya Cherrah
- Laboratory of Pharmacology and Toxicology, University Mohammed V Souissi, Rabat, Morocco
| | - Hans-Josef Altenbach
- Department of Organic Chemistry, University of Wuppertal, Gaußstr. 20, 42097 Wuppertal, Germany
| | - Amal H Aly
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-University Düsseldorf, Universitätsstr. 1, Building 26.23, 40225 Düsseldorf, Germany
| | - Ahmed Chadli
- Cancer Research Center, Molecular Chaperones Biology, Georgia Regents University, 1410 Laney Walker Blvd, CN-3151, Augusta, GA 30912, United States.
| | - Abdessamad Debbab
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-University Düsseldorf, Universitätsstr. 1, Building 26.23, 40225 Düsseldorf, Germany.
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Fair RJ, Tor Y. Antibiotics and bacterial resistance in the 21st century. PERSPECTIVES IN MEDICINAL CHEMISTRY 2014; 6:25-64. [PMID: 25232278 PMCID: PMC4159373 DOI: 10.4137/pmc.s14459] [Citation(s) in RCA: 841] [Impact Index Per Article: 84.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 06/24/2014] [Accepted: 06/24/2014] [Indexed: 12/11/2022]
Abstract
Dangerous, antibiotic resistant bacteria have been observed with increasing frequency over the past several decades. In this review the factors that have been linked to this phenomenon are addressed. Profiles of bacterial species that are deemed to be particularly concerning at the present time are illustrated. Factors including economic impact, intrinsic and acquired drug resistance, morbidity and mortality rates, and means of infection are taken into account. Synchronously with the waxing of bacterial resistance there has been waning antibiotic development. The approaches that scientists are employing in the pursuit of new antibacterial agents are briefly described. The standings of established antibiotic classes as well as potentially emerging classes are assessed with an emphasis on molecules that have been clinically approved or are in advanced stages of development. Historical perspectives, mechanisms of action and resistance, spectrum of activity, and preeminent members of each class are discussed.
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Affiliation(s)
- Richard J Fair
- Department for Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Berlin, Germany
| | - Yitzhak Tor
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
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Mirzaie S, Najafi K, Hakhamaneshi MS, Shahverdi AR, Fathi F. Investigation for antimicrobial resistance-modulating activity of diethyl malate and 1-methyl malate against beta-lactamase class A fromBacillus licheniformisby molecular dynamics,in vitroandin vivostudies. J Biomol Struct Dyn 2014; 33:1016-26. [PMID: 24836845 DOI: 10.1080/07391102.2014.924877] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Sako Mirzaie
- a Department of Biochemistry, Sanandaj Branch , Islamic Azad University , Sanandaj , Iran
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Daumann LJ, Schenk G, Gahan LR. Metallo-β-lactamases and Their Biomimetic Complexes. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402203] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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36
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McGeary RP, Schenk G, Guddat LW. The applications of binuclear metallohydrolases in medicine: Recent advances in the design and development of novel drug leads for purple acid phosphatases, metallo-β-lactamases and arginases. Eur J Med Chem 2014; 76:132-44. [DOI: 10.1016/j.ejmech.2014.02.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 01/28/2014] [Accepted: 02/06/2014] [Indexed: 10/25/2022]
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Abstract
The β-lactam antibiotics are essential for the treatment of a wide range of human bacterial diseases. However, a class of zinc-dependent hydrolases known as the metallo-β-lactamase (MBL) can confer bacteria with extended spectrum β-lactam resistance. To date, there are no clinically approved MBL inhibitors, making these enzymes a serious threat to human health. In this review, a structural approach is taken to outline some of the more promising MBL inhibitors and shed light on how the resistance conferred by this emerging class of enzymes may be circumvented in the future.
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Brown MC, Verma D, Russell C, Jacobs DJ, Livesay DR. A case study comparing quantitative stability-flexibility relationships across five metallo-β-lactamases highlighting differences within NDM-1. Methods Mol Biol 2014; 1084:227-38. [PMID: 24061924 PMCID: PMC4676803 DOI: 10.1007/978-1-62703-658-0_12] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The Distance Constraint Model (DCM) is an ensemble-based biophysical model that integrates thermodynamic and mechanical viewpoints of protein structure. The DCM outputs a large number of structural characterizations that collectively allow for Quantified Stability-Flexibility Relationships (QSFR) to be identified and compared across protein families. Using five metallo-β-lactamases (MBLs) as a representative set, we demonstrate how QSFR properties are both conserved and varied across protein families. Similar to our characterizations on other protein families, the backbone flexibility of the five MBLs are overall visually conserved, yet there are interesting specific quantitative differences. For example, the plasmid-encoded NDM-1 enzyme, which leads to a fast spreading drug-resistant version of Klebsiella pneumoniae, has several regions of significantly increased rigidity relative to the other four. In addition, the set of intramolecular couplings within NDM-1 are also atypical. While long-range couplings frequently vary significantly across protein families, NDM-1 is distinct because it has limited correlated flexibility, which is isolated within the active site S3/S4 and S11/H6 loops. These loops are flexibly correlated in the other members, suggesting it is important to function, but the others also have significant amounts of correlated flexibility throughout the rest of their structures.
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Affiliation(s)
- Matthew C. Brown
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC 28262
| | - Deeptak Verma
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC 28262
| | - Christian Russell
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC 28262
| | - Donald J. Jacobs
- Department of Physics and Optical Science, University of North Carolina at Charlotte, Charlotte, NC 28262
| | - Dennis R. Livesay
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC 28262, To whom correspondence should be addressed:
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Gan M, Liu Y, Bai Y, Guan Y, Li L, Gao R, He W, You X, Li Y, Yu L, Xiao C. Polyketides with New Delhi metallo-β-lactamase 1 inhibitory activity from Penicillium sp. JOURNAL OF NATURAL PRODUCTS 2013; 76:1535-1540. [PMID: 23972215 DOI: 10.1021/np4000944] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three new polyketide compounds (1-3), a new quinolone alkaloid (4), and seven known polyketide derivatives were identified from the cultures of Penicillium sp. I09F 484, a strain isolated from the rhizosphere soil of the plant Picea asperata from Kanas Lake, Xinjiang, China. Their structures were elucidated by extensive spectroscopic data analysis. The absolute configurations of 1 and 4 were established by quantum chemical time-dependent density functional theory electronic circular dichroism calculation and Marfey's method, respectively. Compounds 1 and 2 displayed inhibitory activity against New Delhi metallo-β-lactamase 1 with IC₅₀ values of 94.9 and 87.9 μM, respectively.
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Affiliation(s)
- Maoluo Gan
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050, People's Republic of China
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41
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Lu K, Zhang Y, Li L, Wang X, Ding G. Chaetochromones A and B, two new polyketides from the fungus Chaetomium indicum (CBS.860.68). Molecules 2013; 18:10944-52. [PMID: 24013408 PMCID: PMC6269930 DOI: 10.3390/molecules180910944] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 08/28/2013] [Accepted: 09/02/2013] [Indexed: 01/22/2023] Open
Abstract
Chaetochromones A (1) and B (2), two novel polyketides, were isolated from the crude extract of fungus Chaetomium indicum (CBS.860.68) together with three known analogues PI-3(3), PI-4 (4) and SB236050 (5). The structures of these compounds were determined by HRESI-MS and NMR experiments. Chaetochromones A (1) and B (2) are a member of the polyketides family, which might originate from a similar biogenetic pathway as the known compounds PI-3 (3), PI-4 (4) and SB236050 (5). The biological activities of these secondary metabolites were evaluated against eight plant pathogens, including Alternaria alternata, Ilyonectria radicicola, Trichoderma viride pers, Aspergillus niger, Fusarium verticillioide, Irpex lacteus (Fr.), Poria placenta (Fr.) Cooke and Coriolus versicolor (L.) Quél. Compound 1 displayed moderate inhibitory rate (>60%) against the brown rot fungus Poria placenta (Fr.) Cooke, which causes significant wood decay. In addition, the cytotoxic activities against three cancer cell lines A549, MDA-MB-231, PANC-1 were also tested, without any inhibitory activities being detected.
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Affiliation(s)
- Keyang Lu
- Key Laboratory of wood science and Technology of State Forestry Administration, Research Institute of Wood Industry, Chinese Academy of forestry, Beijing 100091, China; E-Mail: (K.L.)
| | - Yisheng Zhang
- Key Laboratory of wood science and Technology of State Forestry Administration, Research Institute of Wood Industry, Chinese Academy of forestry, Beijing 100091, China; E-Mail: (K.L.)
- School of Technology, Beijing Forestry University, Beijing 100091, China
- Authors to whom correspondence should be addressed; E-Mails: (Y.Z.); (G.D.); Tel.: +86-10-6288-9412 (Y.Z.); Fax: +86-10-6288-1937 (Y.Z.)
| | - Li Li
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; E-Mail:
| | - Xuewei Wang
- State Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China; E-Mail: (X.W.)
| | - Gang Ding
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China
- Authors to whom correspondence should be addressed; E-Mails: (Y.Z.); (G.D.); Tel.: +86-10-6288-9412 (Y.Z.); Fax: +86-10-6288-1937 (Y.Z.)
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Metallo-β-lactamase: Inhibitors and reporter substrates. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:1648-59. [DOI: 10.1016/j.bbapap.2013.04.024] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 04/18/2013] [Accepted: 04/21/2013] [Indexed: 11/22/2022]
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Faridoon, Ul Islam N. An Update on the Status of Potent Inhibitors of Metallo-β-Lactamases. Sci Pharm 2013; 81:309-27. [PMID: 23833706 PMCID: PMC3700068 DOI: 10.3797/scipharm.1302-08] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 03/28/2013] [Indexed: 11/22/2022] Open
Abstract
The production of metallo-β-lactamases is the most important strategy by which pathogenic bacteria become resistant to currently known β-lactam antibiotics. The emergence of these enzymes is particularly concerning for the future treatment of bacterial infections. There are no clinically available drugs capable of inhibiting any of the metallo-β-lactamases, so there is an urgent need to find such inhibitors. In this review, an up-to-date status of the inhibitors investigated for the inhibition of metallo-β-lactamases has been given so that this rich source of structural information of presently known metallo-β-lactamases could be helpful in generating a broad-spectrum potent inhibitor of metallo-β-lactamases.
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Affiliation(s)
- Faridoon
- Chemistry Department, Islamia College University, Peshawar-25120, Pakistan
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44
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Valdez CE, Sparta M, Alexandrova AN. The Role of the Flexible L43-S54 Protein Loop in the CcrA Metallo-β-lactamase in Binding Structurally Dissimilar β-Lactam Antibiotics. J Chem Theory Comput 2012; 9:730-7. [DOI: 10.1021/ct300712j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Crystal E. Valdez
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095-1569, United
States
| | - Manuel Sparta
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095-1569, United
States
| | - Anastassia N. Alexandrova
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095-1569, United
States
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45
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Yan J, Cheng M, Hu F, Hu Y. Direct Synthesis of Functional Azaxanthones by Using a Domino Three-Component Reaction. Org Lett 2012; 14:3206-9. [DOI: 10.1021/ol3013099] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jianwei Yan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 ZuChongZhi Road, Shanghai, 201203, China
| | - Ming Cheng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 ZuChongZhi Road, Shanghai, 201203, China
| | - Feng Hu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 ZuChongZhi Road, Shanghai, 201203, China
| | - Youhong Hu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 ZuChongZhi Road, Shanghai, 201203, China
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Wetzel S, Bon RS, Kumar K, Waldmann H. Biology-Oriented Synthesis. Angew Chem Int Ed Engl 2011; 50:10800-26. [DOI: 10.1002/anie.201007004] [Citation(s) in RCA: 396] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Indexed: 12/22/2022]
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48
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Microwave assisted synthesis of indole-annulated dihydropyrano[3,4-c]chromene derivatives via hetero-Diels–Alder reaction. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.06.052] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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49
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Borra PS, Leiros HKS, Ahmad R, Spencer J, Leiros I, Walsh TR, Sundsfjord A, Samuelsen O. Structural and computational investigations of VIM-7: insights into the substrate specificity of vim metallo-β-lactamases. J Mol Biol 2011; 411:174-89. [PMID: 21645522 DOI: 10.1016/j.jmb.2011.05.035] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 05/16/2011] [Accepted: 05/23/2011] [Indexed: 11/24/2022]
Abstract
The presence of metallo-β-lactamases (MBLs) in many clinically important human bacterial pathogens limits treatment options, as these enzymes efficiently hydrolyze nearly all β-lactam antibiotics. VIM enzymes are among the most widely distributed MBLs, but many of the individual VIM subtypes remain poorly characterized. Pseudomonas aeruginosa VIM-7 is the most divergent among VIM-type MBLs in terms of amino acid sequence. Here we present crystal structures of VIM-7 as the native enzyme, with Cys221 oxidized (VIM-7-Ox), and with a sulfur atom bridging the two active-site zinc ions (VIM-7-S). Comparison with VIM-2 and VIM-4 structures suggests an explanation for the reduced catalytic efficiency of VIM-7 against cephalosporins with a positively charged cyclic substituent at the C3 position (e.g., ceftazidime). Kinetic variations are attributed to substitutions in residues 60-66 (that form a loop adjacent to the active site previously implicated in substrate binding) and to the disruption of two hydrogen-bonding clusters through substitutions at positions 218 and 224. Furthermore, the less negatively charged surface of VIM-7 (compared to VIM-2) may also contribute to the reduced hydrolytic efficiency. Docking of the cephalosporins ceftazidime and cefotaxime into the VIM-2 and VIM-7 structures reveals that amino acid substitutions may cause the mode of substrate binding to differ between the two enzymes. Our structures thus provide new insights into the variation in substrate specificity that is evident across this family of clinically important enzymes.
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Affiliation(s)
- Pardha Saradhi Borra
- Research Group for Host-Microbe Interactions, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway
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Dückert H, Khedkar V, Waldmann H, Kumar K. Lewis base catalyzed [4+2] annulation of electron-deficient chromone-derived heterodienes and acetylenes. Chemistry 2011; 17:5130-7. [PMID: 21432922 DOI: 10.1002/chem.201003572] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Indexed: 01/09/2023]
Abstract
Lewis base catalyzed [4+2] annulation reactions between electron-deficient chromone oxa- and azadienes and acetylene carboxylates provide tricyclic benzopyrones inspired by natural products. An asymmetric synthesis of the tricyclic benzopyrones was developed by using modified cinchona alkaloids as enantiodifferentiating Lewis base catalysts.
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Affiliation(s)
- Heiko Dückert
- Max-Planck-Institut für molekulare Physiologie, Abteilung Chemische Biologie, Otto-Hahn-Str. 11, 44227 Dortmund, Germany
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