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Pluháček T, Lemr K, Ghosh D, Milde D, Novák J, Havlíček V. Characterization of microbial siderophores by mass spectrometry. MASS SPECTROMETRY REVIEWS 2016; 35:35-47. [PMID: 25980644 DOI: 10.1002/mas.21461] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 12/19/2014] [Indexed: 05/28/2023]
Abstract
Siderophores play important roles in microbial iron piracy, and are applied as infectious disease biomarkers and novel pharmaceutical drugs. Inductively coupled plasma and molecular mass spectrometry (ICP-MS) combined with high resolution separations allow characterization of siderophores in complex samples taking advantages of mass defect data filtering, tandem mass spectrometry, and iron-containing compound quantitation. The enrichment approaches used in siderophore analysis and current ICP-MS technologies are reviewed. The recent tools for fast dereplication of secondary metabolites and their databases are reported. This review on siderophores is concluded with their recent medical, biochemical, geochemical, and agricultural applications in mass spectrometry context.
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Affiliation(s)
- Tomáš Pluháček
- Department of Analytical Chemistry, Faculty of Science, Regional Centre of Advanced Technologies and Materials, Palacky University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
- Institute of Microbiology, AS CR v.v.i., Videnska 1083, CZ 142 20, Prague 4, Czech Republic
| | - Karel Lemr
- Department of Analytical Chemistry, Faculty of Science, Regional Centre of Advanced Technologies and Materials, Palacky University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
- Institute of Microbiology, AS CR v.v.i., Videnska 1083, CZ 142 20, Prague 4, Czech Republic
| | - Dipankar Ghosh
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, 110067, India
| | - David Milde
- Department of Analytical Chemistry, Faculty of Science, Regional Centre of Advanced Technologies and Materials, Palacky University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
| | - Jiří Novák
- Institute of Microbiology, AS CR v.v.i., Videnska 1083, CZ 142 20, Prague 4, Czech Republic
| | - Vladimír Havlíček
- Department of Analytical Chemistry, Faculty of Science, Regional Centre of Advanced Technologies and Materials, Palacky University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
- Institute of Microbiology, AS CR v.v.i., Videnska 1083, CZ 142 20, Prague 4, Czech Republic
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202
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Medina E, Pieper DH. Tackling Threats and Future Problems of Multidrug-Resistant Bacteria. Curr Top Microbiol Immunol 2016; 398:3-33. [PMID: 27406189 DOI: 10.1007/82_2016_492] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
With the advent of the antibiotic era, the overuse and inappropriate consumption and application of antibiotics have driven the rapid emergence of multidrug-resistant pathogens. Antimicrobial resistance increases the morbidity, mortality, length of hospitalization and healthcare costs. Among Gram-positive bacteria, Staphylococcus aureus (MRSA) and multidrug-resistant (MDR) Mycobacterium tuberculosis, and among the Gram-negative bacteria, extended-spectrum beta-lactamase (ESBLs)-producing bacteria have become a major global healthcare problem in the 21st century. The pressure to use antibiotics guarantees that the spread and prevalence of these as well as of future emerging multidrug-resistant pathogens will be a persistent phenomenon. The unfeasibility of reversing antimicrobial resistance back towards susceptibility and the critical need to treat bacterial infection in modern medicine have burdened researchers and pharmaceutical companies to develop new antimicrobials effective against these difficult-to-treat multidrug-resistant pathogens. However, it can be anticipated that antibiotic resistance will continue to develop more rapidly than new agents to treat these infections become available and a better understanding of the molecular, evolutionary and ecological mechanisms governing the spread of antibiotic resistance is needed. The only way to curb the current crisis of antimicrobial resistance will be to develop entirely novel strategies to fight these pathogens such as combining antimicrobial drugs with other agents that counteract and obstruct the antibiotic resistant mechanisms expressed by the pathogen. Furthermore, as many antibiotics are often inappropriately prescribed, a more personalized approach based on precise diagnosis tools will ensure that proper treatments can be promptly applied leading to more targeted and effective therapies. However, in more general terms, also the overall use and release of antibiotics in the environment needs to be better controlled.
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Affiliation(s)
- Eva Medina
- Infection Immunology Research Group, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124, Braunschweig, Germany.
| | - Dietmar Helmut Pieper
- Microbial Interactions and Processes Research Group, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124, Braunschweig, Germany
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203
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Bogdan J, Zarzyńska J, Pławińska-Czarnak J. Comparison of Infectious Agents Susceptibility to Photocatalytic Effects of Nanosized Titanium and Zinc Oxides: A Practical Approach. NANOSCALE RESEARCH LETTERS 2015; 10:1023. [PMID: 26239879 PMCID: PMC4523504 DOI: 10.1186/s11671-015-1023-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 07/27/2015] [Indexed: 05/20/2023]
Abstract
Nanotechnology contributes towards a more effective eradication of pathogens that have emerged in hospitals, veterinary clinics, and food processing plants and that are resistant to traditional drugs or disinfectants. Since new methods of pathogens eradication must be invented and implemented, nanotechnology seems to have become the response to that acute need. A remarkable achievement in this field of science was the creation of self-disinfecting surfaces that base on advanced oxidation processes (AOPs). Thus, the phenomenon of photocatalysis was practically applied. Among the AOPs that have been most studied in respect of their ability to eradicate viruses, prions, bacteria, yeasts, and molds, there are the processes of TiO2/UV and ZnO/UV. Titanium dioxide (TiO2) and zinc oxide (ZnO) act as photocatalysts, after they have been powdered to nanoparticles. Ultraviolet (UV) radiation is an agent that determines their excitation. Methods using photocatalytic properties of nanosized TiO2 and ZnO prove to be highly efficient in inactivation of infectious agents. Therefore, they are being applied on a growing scale. AOP-based disinfection is regarded as a very promising tool that might help overcome problems in food hygiene and public health protection. The susceptibility of infectious agents to photocatalylic processes can be generally arranged in the following order: viruses > prions > Gram-negative bacteria > Gram-positive bacteria > yeasts > molds.
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Affiliation(s)
- Janusz Bogdan
- Department of Food Hygiene and Public Health Protection Faculty of Veterinary Medicine, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Joanna Zarzyńska
- Department of Food Hygiene and Public Health Protection Faculty of Veterinary Medicine, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Joanna Pławińska-Czarnak
- Department of Food Hygiene and Public Health Protection Faculty of Veterinary Medicine, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
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204
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Pharmacokinetics/Pharmacodynamics of Peptide Deformylase Inhibitor GSK1322322 against Streptococcus pneumoniae, Haemophilus influenzae, and Staphylococcus aureus in Rodent Models of Infection. Antimicrob Agents Chemother 2015; 60:180-9. [PMID: 26482300 DOI: 10.1128/aac.01842-15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 10/12/2015] [Indexed: 12/30/2022] Open
Abstract
GSK1322322 is a novel inhibitor of peptide deformylase (PDF) with good in vitro activity against bacteria associated with community-acquired pneumonia and skin infections. We have characterized the in vivo pharmacodynamics (PD) of GSK1322322 in immunocompetent animal models of infection with Streptococcus pneumoniae and Haemophilus influenzae (mouse lung model) and with Staphylococcus aureus (rat abscess model) and determined the pharmacokinetic (PK)/PD index that best correlates with efficacy and its magnitude. Oral PK studies with both models showed slightly higher-than-dose-proportional exposure, with 3-fold increases in area under the concentration-time curve (AUC) with doubling doses. GSK1322322 exhibited dose-dependent in vivo efficacy against multiple isolates of S. pneumoniae, H. influenzae, and S. aureus. Dose fractionation studies with two S. pneumoniae and S. aureus isolates showed that therapeutic outcome correlated best with the free AUC/MIC (fAUC/MIC) index in S. pneumoniae (R(2), 0.83), whereas fAUC/MIC and free maximum drug concentration (fCmax)/MIC were the best efficacy predictors for S. aureus (R(2), 0.9 and 0.91, respectively). Median daily fAUC/MIC values required for stasis and for a 1-log10 reduction in bacterial burden were 8.1 and 14.4 for 11 S. pneumoniae isolates (R(2), 0.62) and 7.2 and 13.0 for five H. influenzae isolates (R(2), 0.93). The data showed that for eight S. aureus isolates, fAUC correlated better with efficacy than fAUC/MIC (R(2), 0.91 and 0.76, respectively), as efficacious AUCs were similar for all isolates, independent of their GSK1322322 MIC (range, 0.5 to 4 μg/ml). Median fAUCs of 2.1 and 6.3 μg · h/ml were associated with stasis and 1-log10 reductions, respectively, for S. aureus.
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205
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El Zowalaty ME, Al Thani AA, Webster TJ, El Zowalaty AE, Schweizer HP, Nasrallah GK, Marei HE, Ashour HM. Pseudomonas aeruginosa: arsenal of resistance mechanisms, decades of changing resistance profiles, and future antimicrobial therapies. Future Microbiol 2015; 10:1683-706. [PMID: 26439366 DOI: 10.2217/fmb.15.48] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Antimicrobial resistance is one of the most serious public health issues facing humans since the discovery of antimicrobial agents. The frequent, prolonged, and uncontrolled use of antimicrobial agents are major factors in the emergence of antimicrobial-resistant bacterial strains, including multidrug-resistant variants. Pseudomonas aeruginosa is a leading cause of nosocomial infections. The abundant data on the increased resistance to antipseudomonal agents support the need for global action. There is a paucity of new classes of antibiotics active against P. aeruginosa. Here, we discuss recent antibacterial resistance profiles and mechanisms of resistance by P. aeruginosa. We also review future potential methods for controlling antibiotic-resistant bacteria, such as phage therapy, nanotechnology and antipseudomonal vaccines.
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Affiliation(s)
- Mohamed E El Zowalaty
- Department of Microbiology & Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA.,BioMedical Research Center, Qatar University, Doha, PO Box 2713, Qatar
| | - Asmaa A Al Thani
- BioMedical Research Center, Qatar University, Doha, PO Box 2713, Qatar.,Department of Health Sciences, College of Arts and Sciences, Qatar University, Doha 2713, Qatar
| | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA 02018, USA.,Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
| | - Ahmed E El Zowalaty
- Department of Physiology & Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.,Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, USA
| | - Herbert P Schweizer
- Department of Molecular Genetics & Microbiology, College of Medicine, University of Florida, Gainesville, FL 32611, USA.,Emerging Pathogens Institute, Institute for Therapeutic Innovation, University of Florida Gainesville, FL 32611, USA
| | - Gheyath K Nasrallah
- BioMedical Research Center, Qatar University, Doha, PO Box 2713, Qatar.,Department of Health Sciences, College of Arts and Sciences, Qatar University, Doha 2713, Qatar
| | - Hany E Marei
- BioMedical Research Center, Qatar University, Doha, PO Box 2713, Qatar
| | - Hossam M Ashour
- Department of Microbiology & Immunology, Faculty of Pharmacy, Cairo University, Egypt.,Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy & Health Sciences, Wayne State University, Detroit, MI, USA
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206
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Viganor L, Galdino ACM, Nunes APF, Santos KRN, Branquinha MH, Devereux M, Kellett A, McCann M, Santos ALS. Anti-Pseudomonas aeruginosa activity of 1,10-phenanthroline-based drugs against both planktonic- and biofilm-growing cells. J Antimicrob Chemother 2015; 71:128-34. [PMID: 26416778 DOI: 10.1093/jac/dkv292] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 08/21/2015] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVES The beneficial antimicrobial properties of 1,10-phenanthroline (phen)-based drugs, together with the imperative need to develop new chemotherapeutic options for prevention/treatment of infections caused by MDR Gram-negative bacteria, led us to evaluate the effects of phen, 1,10-phenanthroline-5,6-dione (phendione), [Ag(phendione)2]ClO4 and [Cu(phendione)3](ClO4)2·4H2O on planktonic- and biofilm-growing Pseudomonas aeruginosa. METHODS Thirty-two non-duplicated Brazilian clinical isolates of P. aeruginosa with distinct genetic backgrounds were used in all experiments. The effect of test compounds on planktonic bacterial proliferation was determined as recommended by CLSI protocol. The effect on biofilm formation was evaluated by crystal violet incorporation (biomass determination) and XTT (viability assay). Mature biofilm disorganization was evidenced by staining with crystal violet. RESULTS Phen-based compounds presented anti-P. aeruginosa activity, but with different potencies concerning the geometric mean MIC: [Cu(phendione)3](2+) (7.76 μM) > [Ag(phendione)2](+) (14.05 μM) > phendione (31.15 μM) > phen (579.28 μM). MICs of each compound were similar irrespective of whether the P. aeruginosa isolates were susceptible or resistant to classical antimicrobials (ceftazidime, meropenem and imipenem). The pretreatment of bacteria with phen, phendione and phendione's metal derivatives at 0.5 × MIC value inhibited biofilm formation, particularly the use of [Cu(phendione)3](2+) and [Ag(phendione)2](+), which significantly reduced both biomass (48% and 44%, respectively) and viability (78% and 77%, respectively). The compounds studied also disrupted mature biofilm in a dose-dependent manner, especially [Ag(phendione)2](+) and [Cu(phendione)3](2+) (IC50, 9.39 and 10.16 μM, respectively). CONCLUSIONS Coordination of phendione to Ag(+) and Cu(2+) represents a new promising group of anti-infective agents, which revealed a potent anti-P. aeruginosa action against both planktonic- and biofilm-growing cells.
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Affiliation(s)
- Livia Viganor
- General Microbiology Department, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil The Inorganic Pharmaceutical and Biomimetic Research Centre, Focas Research Institute, Dublin Institute of Technology, Dublin, Ireland
| | - Anna Clara M Galdino
- General Microbiology Department, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil Biochemistry Post-Graduation Programme, Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Paula F Nunes
- Pathology Department and Infection Diseases Post-Graduation Programme, Federal University of Espírito Santo, Espírito Santo, Brazil
| | - Kátia R N Santos
- Medical Microbiology Department, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marta H Branquinha
- General Microbiology Department, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Michael Devereux
- The Inorganic Pharmaceutical and Biomimetic Research Centre, Focas Research Institute, Dublin Institute of Technology, Dublin, Ireland
| | - Andrew Kellett
- School of Chemical Sciences and the National Institute for Cellular Biotechnology, Dublin City University, Dublin, Ireland
| | - Malachy McCann
- Chemistry Department, Maynooth University, National University of Ireland, Maynooth, Ireland
| | - André L S Santos
- General Microbiology Department, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil The Inorganic Pharmaceutical and Biomimetic Research Centre, Focas Research Institute, Dublin Institute of Technology, Dublin, Ireland
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207
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McShan AC, De Guzman RN. The bacterial type III secretion system as a target for developing new antibiotics. Chem Biol Drug Des 2015; 85:30-42. [PMID: 25521643 DOI: 10.1111/cbdd.12422] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 08/25/2014] [Accepted: 08/26/2014] [Indexed: 01/14/2023]
Abstract
Antibiotic resistance in pathogens requires new targets for developing novel antibacterials. The bacterial type III secretion system (T3SS) is an attractive target for developing antibacterials as it is essential in the pathogenesis of many Gram-negative bacteria. The T3SS consists of structural proteins, effectors, and chaperones. Over 20 different structural proteins assemble into a complex nanoinjector that punctures a hole on the eukaryotic cell membrane to allow the delivery of effectors directly into the host cell cytoplasm. Defects in the assembly and function of the T3SS render bacteria non-infective. Two major classes of small molecules, salicylidene acylhydrazides and thiazolidinones, have been shown to inhibit multiple genera of bacteria through the T3SS. Many additional chemically and structurally diverse classes of small molecule inhibitors of the T3SS have been identified as well. While specific targets within the T3SS of a few inhibitors have been suggested, the vast majority of specific protein targets within the T3SS remain to be identified or characterized. Other T3SS inhibitors include polymers, proteins, and polypeptides mimics. In addition, T3SS activity is regulated by its interaction with biologically relevant molecules, such as bile salts and sterols, which could serve as scaffolds for drug design.
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Affiliation(s)
- Andrew C McShan
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS, 66045, USA
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208
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Choi JH, Jang AY, Lin S, Lim S, Kim D, Park K, Han SM, Yeo JH, Seo HS. Melittin, a honeybee venom‑derived antimicrobial peptide, may target methicillin‑resistant Staphylococcus aureus. Mol Med Rep 2015; 12:6483-90. [PMID: 26330195 PMCID: PMC4626175 DOI: 10.3892/mmr.2015.4275] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 07/28/2015] [Indexed: 11/22/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is difficult to treat using available antibiotic agents. Honeybee venom has been widely used as an oriental treatment for several inflammatory diseases and bacterial infections. The venom contains predominantly biologically active compounds, however, the therapeutic effects of such materials when used to treat MRSA infections have not been investigated extensively. The present study evaluated bee venom and its principal active component, melittin, in terms of their antibacterial activities and in vivo protection against MRSA infections. In vitro, bee venom and melittin exhibited comparable levels of antibacterial activity, which was more marked against MRSA strains, compared with other Gram-positive bacteria. When MRSA-infected mice were treated with bee venom or melittin, only the latter animals were successfully rescued from MRSA- induced bacteraemia or exhibited recovery from MRSA-infected skin wounds. Together, the data of the present study demonstrated for the first time, to the best of our knowledge, that melittin may be used as a promising antimicrobial agent to enhance the healing of MRSA-induced wounds.
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Affiliation(s)
- Ji Hae Choi
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
| | - A Yeung Jang
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
| | - Shunmei Lin
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
| | - Sangyong Lim
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
| | - Dongho Kim
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
| | - Kyungho Park
- Department of Dermatology, University of California, San Francisco and Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Sang-Mi Han
- Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, Rural Development Association, Suwon, Gyeonggi-do 441‑100, Republic of Korea
| | - Joo-Hong Yeo
- Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, Rural Development Association, Suwon, Gyeonggi-do 441‑100, Republic of Korea
| | - Ho Seong Seo
- Radiation Biotechnology Research Division, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup Si, North Jeolla 580‑185, Republic of Korea
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209
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Bassetti M, Righi E. Ceftolozane/tazobactam for the treatment of complicated urinary tract and intra-abdominal infections. Future Microbiol 2015; 10:151-60. [PMID: 25689527 DOI: 10.2217/fmb.14.112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
High rates of morbidity and mortality have been linked to the emergence of antimicrobial-resistant Gram-negative pathogens, especially in the hospital setting. Infections due to extended-spectrum-β-lactamase producing Enterobacteriaceae (e.g., Escherichia coli, Klebsiella pneumoniae) and multidrug-resistant Pseudomonas aeruginosa pose a major health threat and dramatically reduce the therapeutic options to achieve an appropriate treatment. There is a need for novel antimicrobials that could provide clinical efficacy toward multidrug-resistant Gram-negative pathogens, including extended-spectrum-β-lactamase and carbapenemase producers. Ceftolozane/tazobactam is a novel antipseudomonal cephalosporin associated with a well-established β-lactamase inhibitor currently in clinical development for the treatment of complicated intra-abdominal infections, complicated urinary tract infections and nosocomial pneumonia. Phase II and III trials have shown high efficacy and good tolerability in complicated urinary and intra-abdominal infections compared with standard therapy. A study for the treatment of nosocomial pneumonia is planned.
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Affiliation(s)
- Matteo Bassetti
- Infectious Diseases Division, Santa Maria Misericordia University Hospital, Udine, Italy
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210
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McKinney DC, Basarab GS, Cocozaki AI, Foulk MA, Miller MD, Ruvinsky AM, Scott CW, Thakur K, Zhao L, Buurman ET, Narayan S. Structural Insights Lead to a Negamycin Analogue with Improved Antimicrobial Activity against Gram-Negative Pathogens. ACS Med Chem Lett 2015; 6:930-5. [PMID: 26288696 DOI: 10.1021/acsmedchemlett.5b00205] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 07/12/2015] [Indexed: 11/29/2022] Open
Abstract
Negamycin is a natural product with antibacterial activity against a broad range of Gram-negative pathogens. Recent revelation of its ribosomal binding site and mode of inhibition has reinvigorated efforts to identify improved analogues with clinical potential. Translation-inhibitory potency and antimicrobial activity upon modification of different moieties of negamycin were in line with its observed ribosomal binding conformation, reaffirming stringent structural requirements for activity. However, substitutions on the N6 amine were tolerated and led to N6-(3-aminopropyl)-negamycin (31f), an analogue showing 4-fold improvement in antibacterial activity against key bacterial pathogens. This represents the most potent negamycin derivative to date and may be a stepping stone toward clinical development of this novel antibacterial class.
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Affiliation(s)
- David C. McKinney
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Gregory S. Basarab
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Alexis I. Cocozaki
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Melinda A. Foulk
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Matthew D. Miller
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Anatoly M. Ruvinsky
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Clay W Scott
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Kumar Thakur
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Liang Zhao
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Ed T. Buurman
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Sridhar Narayan
- Departments of †Chemistry and ‡Bioscience, Infection Innovative Medicines; §Structure and Biophysics, Discovery Sciences; ∥Discovery Safety, Drug Safety and Metabolism, AstraZeneca R&D Boston, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
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211
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Ramdeen S, Boucher HW. Dalbavancin for the treatment of acute bacterial skin and skin structure infections. Expert Opin Pharmacother 2015; 16:2073-81. [PMID: 26239321 DOI: 10.1517/14656566.2015.1075508] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Acute bacterial skin and skin structure infections (ABSSSI) have increased in incidence and severity. The involvement of resistant organisms, particularly methicillin-resistant Staphylococcus aureus, presents additional challenges. The lipoglycopeptide dalbavancin has a prolonged half-life, high protein binding, and excellent tissue levels which led to its development as a once-weekly treatment for ABSSSI. In the pivotal DISCOVER 1 and DISCOVER 2 trials, dalbavancin proved non-inferior to vancomycin followed by linezolid when used sequentially for ABSSSI, forming the basis for its recent approval in the US and Europe for ABSSSI. AREAS COVERED A literature search of published pharmacologic and clinical data was conducted to review the chemistry, pharmacodynamics, and pharmacokinetics of dalbavancin. We also discuss its development process, highlighting efficacy and safety data from pertinent clinical trials and the role it could play in the current clinical landscape. EXPERT OPINION DISCOVER 1 and DISCOVER 2 demonstrated dalbavancin's non-inferiority to vancomycin followed by linezolid for ABSSSI and confirmed its safety and tolerability. They were among the first trials to use new, early primary efficacy endpoints, and dalbavancin was among the first agents designated a Qualified Infectious Disease Product for expedited review. Dalbavancin may prove to be a valuable option for ABSSSI patients in whom conventional therapy is limited.
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Affiliation(s)
- Sheena Ramdeen
- Tufts University School of Medicine, Tufts Medical Center, Division of Geographic Medicine and Infectious Diseases , Boston, MA , USA
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Buhl M, Peter S, Willmann M. Prevalence and risk factors associated with colonization and infection of extensively drug-resistant Pseudomonas aeruginosa: a systematic review. Expert Rev Anti Infect Ther 2015; 13:1159-70. [PMID: 26153817 DOI: 10.1586/14787210.2015.1064310] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Pseudomonas aeruginosa is a Gram-negative human pathogen with extensively drug-resistant (XDR) strains emerging in hospitals across the globe. This systematic review is focused on the worldwide prevalence of XDR P. aeruginosa (XDR-PA) and on the risk factors associated with its colonization and infection, based on literature available through PubMed, Web of Science and BioMed Central databases. An overview of surveillance systems is provided as well as a synopsis on the prevalence of XDR-PA, showing an increase in recent reports. Risk factors independently associated with XDR-PA colonization or infections are described in four groups with reference to antimicrobial therapy, medical devices as well as patient- and hospital environment-related factors.
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Affiliation(s)
- Michael Buhl
- Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany
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213
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Insights into the mechanism of inhibition of novel bacterial topoisomerase inhibitors from characterization of resistant mutants of Staphylococcus aureus. Antimicrob Agents Chemother 2015; 59:5278-87. [PMID: 26077256 DOI: 10.1128/aac.00571-15] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Accepted: 06/09/2015] [Indexed: 11/20/2022] Open
Abstract
The type II topoisomerases DNA gyrase and topoisomerase IV are clinically validated bacterial targets that catalyze the modulation of DNA topology that is vital to DNA replication, repair, and decatenation. Increasing resistance to fluoroquinolones, which trap the topoisomerase-DNA complex, has led to significant efforts in the discovery of novel inhibitors of these targets. AZ6142 is a member of the class of novel bacterial topoisomerase inhibitors (NBTIs) that utilizes a distinct mechanism to trap the protein-DNA complex. AZ6142 has very potent activity against Gram-positive organisms, including Staphylococcus aureus, Streptococcus pneumoniae, and Streptococcus pyogenes. In this study, we determined the frequencies of resistance to AZ6142 and other representative NBTI compounds in S. aureus and S. pneumoniae. The frequencies of selection of resistant mutants at 4× the MIC were 1.7 × 10(-8) for S. aureus and <5.5 × 10(-10) for S. pneumoniae. To improve our understanding of the NBTI mechanism of inhibition, the resistant S. aureus mutants were characterized and 20 unique substitutions in the topoisomerase subunits were identified. Many of these substitutions were located outside the NBTI binding pocket and impact the susceptibility of AZ6142, resulting in a 4- to 32-fold elevation in the MIC over the wild-type parent strain. Data on cross-resistance with other NBTIs and fluoroquinolones enabled the differentiation of scaffold-specific changes from compound-specific variations. Our results suggest that AZ6142 inhibits both type II topoisomerases in S. aureus but that DNA gyrase is the primary target. Further, the genotype of the resistant mutants suggests that domain conformations and DNA interactions may uniquely impact NBTIs compared to fluoroquinolones.
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214
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Xu W, Wang W, Wang X. Gold-Catalyzed Cyclization Leads to a Bridged Tetracyclic Indolenine that Represses β-Lactam Resistance. Angew Chem Int Ed Engl 2015; 54:9546-9. [DOI: 10.1002/anie.201503736] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Indexed: 11/11/2022]
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215
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Xu W, Wang W, Wang X. Gold-Catalyzed Cyclization Leads to a Bridged Tetracyclic Indolenine that Represses β-Lactam Resistance. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503736] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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216
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Strategies to reduce curative antibiotic therapy in intensive care units (adult and paediatric). Intensive Care Med 2015; 41:1181-96. [PMID: 26077053 DOI: 10.1007/s00134-015-3853-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 04/28/2015] [Indexed: 02/07/2023]
Abstract
Emerging resistance to antibiotics shows no signs of decline. At the same time, few new antibacterials are being discovered. There is a worldwide recognition regarding the danger of this situation. The urgency of the situation and the conviction that practices should change led the Société de Réanimation de Langue Française (SRLF) and the Société Française d'Anesthésie et de Réanimation (SFAR) to set up a panel of experts from various disciplines. These experts met for the first time at the end of 2012 and have since met regularly to issue the following 67 recommendations, according to the rigorous GRADE methodology. Five fields were explored: i) the link between the resistance of bacteria and the use of antibiotics in intensive care; ii) which microbiological data and how to use them to reduce antibiotic consumption; iii) how should antibiotic therapy be chosen to limit consumption of antibiotics; iv) how can antibiotic administration be optimized; v) review and duration of antibiotic treatments. In each institution, the appropriation of these recommendations should arouse multidisciplinary discussions resulting in better knowledge of local epidemiology, rate of antibiotic use, and finally protocols for improving the stewardship of antibiotics. These efforts should contribute to limit the emergence of resistant bacteria.
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217
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In vitro screening of 1-aryl-6-hydroxy-1,2,3,4-tetrahydroisoquinolines: Structure related activity against pathogenic bacteria. Asian Pac J Trop Biomed 2015. [DOI: 10.1016/j.apjtb.2015.03.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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218
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New antimicrobial approaches to gram positive respiratory infections. Pulm Pharmacol Ther 2015; 32:137-43. [DOI: 10.1016/j.pupt.2014.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 05/01/2014] [Accepted: 05/05/2014] [Indexed: 11/20/2022]
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219
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Hayajneh WA, Hajj A, Hulliel F, Sarkis DK, Irani-Hakimeh N, Kazan L, Badal RE. Susceptibility trends and molecular characterization of Gram-negative bacilli associated with urinary tract and intra-abdominal infections in Jordan and Lebanon: SMART 2011–2013. Int J Infect Dis 2015; 35:56-61. [DOI: 10.1016/j.ijid.2015.04.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 03/27/2015] [Accepted: 04/18/2015] [Indexed: 02/01/2023] Open
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220
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Ventola CL. The antibiotic resistance crisis: part 2: management strategies and new agents. P & T : A PEER-REVIEWED JOURNAL FOR FORMULARY MANAGEMENT 2015; 40:344-352. [PMID: 25987823 PMCID: PMC4422635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Controlling antibiotic-resistant bacteria calls for widespread adoption of antibiotic stewardship programs; better diagnosis, tracking and prescribing practices; optimized therapeutic regimens; prevention of infection transmission-and new drugs.
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221
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Venter H, Mowla R, Ohene-Agyei T, Ma S. RND-type drug efflux pumps from Gram-negative bacteria: molecular mechanism and inhibition. Front Microbiol 2015; 6:377. [PMID: 25972857 PMCID: PMC4412071 DOI: 10.3389/fmicb.2015.00377] [Citation(s) in RCA: 176] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 04/12/2015] [Indexed: 11/13/2022] Open
Abstract
Drug efflux protein complexes confer multidrug resistance on bacteria by transporting a wide spectrum of structurally diverse antibiotics. Moreover, organisms can only acquire resistance in the presence of an active efflux pump. The substrate range of drug efflux pumps is not limited to antibiotics, but it also includes toxins, dyes, detergents, lipids, and molecules involved in quorum sensing; hence efflux pumps are also associated with virulence and biofilm formation. Inhibitors of efflux pumps are therefore attractive compounds to reverse multidrug resistance and to prevent the development of resistance in clinically relevant bacterial pathogens. Recent successes on the structure determination and functional analysis of the AcrB and MexB components of the AcrAB-TolC and MexAB-OprM drug efflux systems as well as the structure of the fully assembled, functional triparted AcrAB-TolC complex significantly contributed to our understanding of the mechanism of substrate transport and the options for inhibition of efflux. These data, combined with the well-developed methodologies for measuring efflux pump inhibition, could allow the rational design, and subsequent experimental verification of potential efflux pump inhibitors (EPIs). In this review we will explore how the available biochemical and structural information can be translated into the discovery and development of new compounds that could reverse drug resistance in Gram-negative pathogens. The current literature on EPIs will also be analyzed and the reasons why no compounds have yet progressed into clinical use will be explored.
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Affiliation(s)
- Henrietta Venter
- School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia Adelaide, SA, Australia
| | - Rumana Mowla
- School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia Adelaide, SA, Australia
| | | | - Shutao Ma
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University Jinan, China
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222
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Antibacterial products of marine organisms. Appl Microbiol Biotechnol 2015; 99:4145-73. [PMID: 25874533 DOI: 10.1007/s00253-015-6553-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 03/17/2015] [Accepted: 03/19/2015] [Indexed: 10/23/2022]
Abstract
Marine organisms comprising microbes, plants, invertebrates, and vertebrates elaborate an impressive array of structurally diverse antimicrobial products ranging from small cyclic compounds to macromolecules such as proteins. Some of these biomolecules originate directly from marine animals while others arise from microbes associated with the animals. It is noteworthy that some of the biomolecules referred to above are structurally unique while others belong to known classes of compounds, peptides, and proteins. Some of the antibacterial agents are more active against Gram-positive bacteria while others have higher effectiveness on Gram-negative bacteria. Some are efficacious against both Gram-positive and Gram-negative bacteria and against drug-resistant strains as well. The mechanism of antibacterial action of a large number of the chemically identified antibacterial agents, possible synergism with currently used antibiotics, and the issue of possible toxicity on mammalian cells and tissues await elucidation. The structural characteristics pivotal to antibacterial activity have been ascertained in only a few studies. Demonstration of efficacy of the antibacterial agents in animal models of bacterial infection is highly desirable. Structural characterization of the active principles present in aqueous and organic extracts of marine organisms with reportedly antibacterial activity would be desirable.
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223
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Hurley KA, Heinrich VA, Hershfield JR, Demons ST, Weibel DB. Membrane-Targeting DCAP Analogues with Broad-Spectrum Antibiotic Activity against Pathogenic Bacteria. ACS Med Chem Lett 2015; 6:466-71. [PMID: 25941556 DOI: 10.1021/acsmedchemlett.5b00024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Accepted: 02/28/2015] [Indexed: 01/18/2023] Open
Abstract
We performed a structure-activity relationship study of 2-((3-(3,6-dichloro-9H-carbazol-9-yl)-2-hydroxypropyl)amino)-2-(hydroxymethyl)propane-1,3-diol (DCAP), which is an antibacterial agent that disrupts the membrane potential and permeability of bacteria. The stereochemistry of DCAP had no effect on the biological activity of DCAP. The aromaticity and electronegativity of the chlorine-substituted carbazole was required for activity, suggesting that its planar and dipolar characteristics orient DCAP in membranes. Increasing the hydrophobicity of the tail region of DCAP enhanced its antibiotic activity. Two DCAP analogues displayed promising antibacterial activity against the BSL-3 pathogens Bacillus anthracis and Francisella tularensis. Codosing DCAP analogues with ampicillin or kanamycin increased their potency. These studies demonstrate that DCAP and its analogues may be a promising scaffold for developing chemotherapeutic agents that bind to bacterial membranes and kill strains of slow-growing or dormant bacteria that cause persistent infections.
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Affiliation(s)
- Katherine A. Hurley
- Department
of Biochemistry and ‡Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Victoria A. Heinrich
- Department
of Biochemistry and ‡Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Jeremy R. Hershfield
- U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland 21702, United States
| | - Samandra T. Demons
- U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland 21702, United States
| | - Douglas B. Weibel
- Department
of Biochemistry and ‡Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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224
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Chan WT, Balsa D, Espinosa M. One cannot rule them all: Are bacterial toxins-antitoxins druggable? FEMS Microbiol Rev 2015; 39:522-40. [PMID: 25796610 PMCID: PMC4487406 DOI: 10.1093/femsre/fuv002] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/02/2015] [Indexed: 01/31/2023] Open
Abstract
Type II (proteic) toxin–antitoxin (TA) operons are widely spread in bacteria and archaea. They are organized as operons in which, usually, the antitoxin gene precedes the cognate toxin gene. The antitoxin generally acts as a transcriptional self-repressor, whereas the toxin acts as a co-repressor, both proteins constituting a harmless complex. When bacteria encounter a stressful environment, TAs are triggered. The antitoxin protein is unstable and will be degraded by host proteases, releasing the free toxin to halt essential processes. The result is a cessation of cell growth or even death. Because of their ubiquity and the essential processes targeted, TAs have been proposed as good candidates for development of novel antimicrobials. We discuss here the possible druggability of TAs as antivirals and antibacterials, with focus on the potentials and the challenges that their use may find in the ‘real’ world. We present strategies to develop TAs as antibacterials in view of novel technologies, such as the use of very small molecules (fragments) as inhibitors of protein–protein interactions. Appropriate fragments could disrupt the T:A interfaces leading to the release of the targeted TA pair. Possible ways of delivery and formulation of Tas are also discussed. We consider various approaches to develop the toxins of the type II family as possible candidates to drug discovery; druggability of toxins-antitoxins could be possible as antivirals. As antibacterials, they might be considered as druggable but delivery and formulation may not be simple so far.
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Affiliation(s)
- Wai Ting Chan
- Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu, 9, 28006-Madrid, Spain
| | - Dolors Balsa
- Immunology & Vaccines, Laboratorios LETI, Gran Via de les Corts Catalanes 184. 08034-Barcelona, Spain
| | - Manuel Espinosa
- Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu, 9, 28006-Madrid, Spain
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225
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Bessa LJ, Palmeira A, Gomes AS, Vasconcelos V, Sousa E, Pinto M, Martins da Costa P. Synergistic Effects Between Thioxanthones and Oxacillin Against Methicillin-Resistant Staphylococcus aureus. Microb Drug Resist 2015; 21:404-15. [PMID: 25789724 DOI: 10.1089/mdr.2014.0162] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The extensive use of antimicrobials is leaving medicine with few effective therapeutic options to treat many infections due to the fact that many organisms developed resistance to commonly used drugs. It is therefore pertinent to search not only for new antimicrobials but also for compounds able to restore or potentiate the activity of existing antibiotics. We have screened a library consisting of 40 (thio)xanthone derivatives for antibacterial activity and possible synergistic effects when used in combination with antibiotics. Nine out of the 40 compounds exhibited antibacterial activity against Gram-positive bacteria. Two xanthone derivatives, 1-formyl-4-hydroxy-3-methoxy (7), 2-formyl-3-hydroxy-4-methoxyxanthone (8) and the thioxanthone derivative 1-((2-(diethylamino)ethyl)amino)-4-propoxythioxanthone (10) and its hydrochloride form 13, showed activity against a methicillin-resistant Staphylococcus aureus (MRSA) isolate with minimum inhibitory concentration (MIC) values lower than 256 μg/ml. Thioxanthone 10 demonstrated antibacterial activity and also synergy when combined with ampicillin and oxacillin against MRSA. Additionally, thioxanthone 1-(piperidin-1-yl)-4-propoxythioxanthone (9), despite not having antibacterial activity presented remarkable synergy with oxacillin against MRSA; the MIC of tioxanthone 9 and oxacillin when both were in combination were 128 and 8 μg/ml, respectively. Thioxanthones 9 and 10 were also found to be synergistic when both were combined. Subsequently, docking simulations between thioxanthones 9 and 10 and the allosteric domain of penicillin-binding protein 2A (PBP2A) were undertaken in AutoDock Vina. Both compounds had the ability to bind with an allosteric domain of PBP2A, which may explain their synergy with oxacillin. These two thioxanthone derivatives with different profiles may be promising tools for restoring the activity of oxacillin against MRSA.
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Affiliation(s)
- Lucinda J Bessa
- 1 Laboratório de Microbiologia e Tecnologia Alimentar, Departamento de Produção Aquática, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto , Porto, Portugal .,2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal
| | - Andreia Palmeira
- 3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Ana S Gomes
- 3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Vitor Vasconcelos
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,4 Departamento de Biologia, Faculdade de Ciências, Universidade do Porto , Porto, Portugal
| | - Emília Sousa
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Madalena Pinto
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Paulo Martins da Costa
- 1 Laboratório de Microbiologia e Tecnologia Alimentar, Departamento de Produção Aquática, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto , Porto, Portugal .,2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal
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226
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Omrane S, Sghyer H, Audéon C, Lanen C, Duplaix C, Walker AS, Fillinger S. Fungicide efflux and the MgMFS1 transporter contribute to the multidrug resistance phenotype inZymoseptoria triticifield isolates. Environ Microbiol 2015; 17:2805-23. [DOI: 10.1111/1462-2920.12781] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 01/07/2015] [Accepted: 01/10/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Selim Omrane
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Hind Sghyer
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Colette Audéon
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Catherine Lanen
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Clémentine Duplaix
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Anne-Sophie Walker
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
| | - Sabine Fillinger
- UR 1290 BIOGER-CPP; INRA; Avenue Lucien Brétignières F-78850 Thiverval-Grignon France
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227
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Lahiri SD, Mangani S, Jahić H, Benvenuti M, Durand-Reville TF, De Luca F, Ehmann DE, Rossolini GM, Alm RA, Docquier JD. Molecular basis of selective inhibition and slow reversibility of avibactam against class D carbapenemases: a structure-guided study of OXA-24 and OXA-48. ACS Chem Biol 2015; 10:591-600. [PMID: 25406838 DOI: 10.1021/cb500703p] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Class D (or OXA-type) β-lactamases have expanded to be the most diverse group of serine β-lactamases with a highly heterogeneous β-lactam hydrolysis profile and are typically resistant to marketed β-lactamase inhibitors. Class D enzymes are increasingly found in multidrug resistant (MDR) Acinetobacter baumannii, Pseudomonas aeruginosa, and various species of the Enterobacteriaceae and are posing a serious threat to the clinical utility of β-lactams including the carbapenems, which are typically reserved as the drugs of last resort. Avibactam, a novel non-β-lactam β-lactamase inhibitor, not only inhibits all class A and class C β-lactamases but also has the promise of inhibition of certain OXA enzymes, thus extending the antibacterial activity of the β-lactam used in combination to the organisms that produce these enzymes. X-ray structures of OXA-24 and OXA-48 in complex with avibactam revealed the binding mode of this inhibitor in this diverse class of enzymes and provides a rationale for selective inhibition of OXA-48 members. Additionally, various subunits of the OXA-48 structure in the asymmetric unit provide snapshots of different states of the inhibited enzyme. Overall, these data provide the first structural evidence of the exceptionally slow reversibility observed with avibactam in class D β-lactamases. Mechanisms for acylation and deacylation of avibactam by class D enzymes are proposed, and the likely extent of inhibition of class D β-lactamases by avibactam is discussed.
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Affiliation(s)
| | | | | | | | | | | | | | - Gian Maria Rossolini
- Department of Experimental and Clinical
Medicine, University of Florence, Florence I-50134, Italy
- Clinical
Microbiology and Virology Unit, Florence Careggi University Hospital, Florence I-50134, Italy
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228
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Nation RL, Li J, Cars O, Couet W, Dudley MN, Kaye KS, Mouton JW, Paterson DL, Tam VH, Theuretzbacher U, Tsuji BT, Turnidge JD. Framework for optimisation of the clinical use of colistin and polymyxin B: the Prato polymyxin consensus. THE LANCET. INFECTIOUS DISEASES 2015; 15:225-34. [DOI: 10.1016/s1473-3099(14)70850-3] [Citation(s) in RCA: 228] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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229
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Lahiri SD, Walkup GK, Whiteaker JD, Palmer T, McCormack K, Tanudra MA, Nash TJ, Thresher J, Johnstone MR, Hajec L, Livchak S, McLaughlin RE, Alm RA. Selection and molecular characterization of ceftazidime/avibactam-resistant mutants in Pseudomonas aeruginosa strains containing derepressed AmpC. J Antimicrob Chemother 2015; 70:1650-8. [PMID: 25645206 DOI: 10.1093/jac/dkv004] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 12/28/2014] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Pseudomonas aeruginosa is an important nosocomial pathogen that can cause a wide range of infections resulting in significant morbidity and mortality. Avibactam, a novel non-β-lactam β-lactamase inhibitor, is being developed in combination with ceftazidime and has the potential to be a valuable addition to the treatment options for the infectious diseases practitioner. We compared the frequency of resistance development to ceftazidime/avibactam in three P. aeruginosa strains that carried derepressed ampC alleles. METHODS The strains were incubated in the presence of increasing concentrations of ceftazidime with a fixed concentration (4 mg/L) of avibactam to calculate the frequency of spontaneous resistance. The mutants were characterized by WGS to identify the underlying mechanism of resistance. A representative mutant protein was characterized biochemically. RESULTS The resistance frequency was very low in all strains. The resistant variants isolated exhibited ceftazidime/avibactam MIC values that ranged from 64 to 256 mg/L. All of the mutants exhibited changes in the chromosomal ampC gene, the majority of which were deletions of various sizes in the Ω-loop region of AmpC. The mutant enzyme that carried the smallest Ω-loop deletion, which formed a part of the avibactam-binding pocket, was characterized biochemically and found to be less effectively inhibited by avibactam as well as exhibiting increased hydrolysis of ceftazidime. CONCLUSIONS The development of high-level resistance to ceftazidime/avibactam appears to occur at low frequency, but structural modifications in AmpC can occur that impact the ability of avibactam to inhibit the enzyme and thereby protect ceftazidime from hydrolysis.
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Affiliation(s)
- Sushmita D Lahiri
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Grant K Walkup
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - James D Whiteaker
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Tiffany Palmer
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Kathy McCormack
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - M Angela Tanudra
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Tory J Nash
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Jason Thresher
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Michele R Johnstone
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Laurie Hajec
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Stephania Livchak
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Robert E McLaughlin
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
| | - Richard A Alm
- Infection Innovative Medicines Unit, AstraZeneca R & D Boston, Waltham, MA, USA
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230
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Rosenberg J, Dickmanns A, Neumann P, Gunka K, Arens J, Kaever V, Stülke J, Ficner R, Commichau FM. Structural and biochemical analysis of the essential diadenylate cyclase CdaA from Listeria monocytogenes. J Biol Chem 2015; 290:6596-606. [PMID: 25605729 DOI: 10.1074/jbc.m114.630418] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The recently identified second messenger cyclic di-AMP (c-di-AMP) is involved in several important cellular processes, such as cell wall metabolism, maintenance of DNA integrity, ion transport, transcription regulation, and allosteric regulation of enzyme function. Interestingly, c-di-AMP is essential for growth of the Gram-positive model bacterium Bacillus subtilis. Although the genome of B. subtilis encodes three c-di-AMP-producing diadenlyate cyclases that can functionally replace each other, the phylogenetically related human pathogens like Listeria monocytogenes and Staphylococcus aureus possess only one enzyme, the diadenlyate cyclase CdaA. Because CdaA is also essential for growth of these bacteria, the enzyme is a promising target for the development of novel antibiotics. Here we present the first crystal structure of the L. monocytogenes CdaA diadenylate cyclase domain that is conserved in many human pathogens. Moreover, biochemical characterization of the cyclase revealed an unusual metal cofactor requirement.
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Affiliation(s)
| | - Achim Dickmanns
- Molecular Structural Biology, Institute for Microbiology and Genetics, Georg-August University Göttingen, D-37077 Göttingen, Germany and
| | - Piotr Neumann
- Molecular Structural Biology, Institute for Microbiology and Genetics, Georg-August University Göttingen, D-37077 Göttingen, Germany and
| | - Katrin Gunka
- From the Departments of General Microbiology and
| | - Johannes Arens
- Molecular Structural Biology, Institute for Microbiology and Genetics, Georg-August University Göttingen, D-37077 Göttingen, Germany and
| | - Volkhard Kaever
- the Research Core Unit Metabolomics, Hannover Medical School, D-30625 Hannover, Germany
| | - Jörg Stülke
- From the Departments of General Microbiology and
| | - Ralf Ficner
- Molecular Structural Biology, Institute for Microbiology and Genetics, Georg-August University Göttingen, D-37077 Göttingen, Germany and
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231
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Mou KT, Muppirala UK, Severin AJ, Clark TA, Boitano M, Plummer PJ. A comparative analysis of methylome profiles of Campylobacter jejuni sheep abortion isolate and gastroenteric strains using PacBio data. Front Microbiol 2015; 5:782. [PMID: 25642218 PMCID: PMC4294202 DOI: 10.3389/fmicb.2014.00782] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 12/20/2014] [Indexed: 12/13/2022] Open
Abstract
Campylobacter jejuni is a leading cause of human gastrointestinal disease and small ruminant abortions in the United States. The recent emergence of a highly virulent, tetracycline-resistant C. jejuni subsp. jejuni sheep abortion clone (clone SA) in the United States, and that strain's association with human disease, has resulted in a heightened awareness of the zoonotic potential of this organism. Pacific Biosciences' Single Molecule, Real-Time sequencing technology was used to explore the variation in the genome-wide methylation patterns of the abortifacient clone SA (IA3902) and phenotypically distinct gastrointestinal-specific C. jejuni strains (NCTC 11168 and 81-176). Several notable differences were discovered that distinguished the methylome of IA3902 from that of 11168 and 81-176: identification of motifs novel to IA3902, genome-specific hypo- and hypermethylated regions, strain level variability in genes methylated, and differences in the types of methylation motifs present in each strain. These observations suggest a possible role of methylation in the contrasting disease presentations of these three C. jejuni strains. In addition, the methylation profiles between IA3902 and a luxS mutant were explored to determine if variations in methylation patterns could be identified that might explain the role of LuxS-dependent methyl recycling in IA3902 abortifacient potential.
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Affiliation(s)
- Kathy T Mou
- Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University Ames, IA, USA
| | - Usha K Muppirala
- Genome Informatics Facility, Office of Biotechnology, Iowa State University Ames, IA, USA
| | - Andrew J Severin
- Genome Informatics Facility, Office of Biotechnology, Iowa State University Ames, IA, USA
| | | | | | - Paul J Plummer
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University Ames, IA, USA
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232
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Young RM, Schoenrock KM, von Salm JL, Amsler CD, Baker BJ. Structure and Function of Macroalgal Natural Products. Methods Mol Biol 2015; 1308:39-73. [PMID: 26108497 DOI: 10.1007/978-1-4939-2684-8_2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Since the initial discovery of marine phyco-derived secondary metabolites in the 1950s there has been a rapid increase in the description of new algal natural products. These metabolites have multiple ecological roles as well as commercial value as potential drugs or lead compounds. With the emergence of resistance to our current arsenal of drugs as well as the development of new chemotherapies for currently untreatable diseases, new compounds must be sourced. As outlined in this chapter algae produce a diverse range of chemicals many of which have potential for the treatment of human afflictions.In this chapter we outline the classes of metabolites produced by this chemically rich group of organisms as well as their respective ecological roles in the environment. Algae are found in nearly every environment on earth, with many of these organisms possessing the ability to shape the ecosystem they inhabit. With current challenges to climate stability, understanding how these important organisms interact with their environment as well as one another might afford better insight into how they respond to a changing climate.
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Affiliation(s)
- Ryan M Young
- Department of Chemistry and Center for Drug Discovery and Innovation, University of South Florida, Tampa, FL, 33620, USA
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233
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Hesterkamp T. Antibiotics Clinical Development and Pipeline. Curr Top Microbiol Immunol 2015; 398:447-474. [DOI: 10.1007/82_2015_451] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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234
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Mishra SK, Shrestha R, Rijal BP, Pokhrel BM. The bad, the ugly and the demon: a tale of extensively drug-resistant, extended-spectrum-beta-lactamase- and metallo-beta-lactamase-producing superbugs associated with nosocomial pneumonia. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2015. [DOI: 10.1016/s2222-1808(14)60630-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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235
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CORR Insights®: Local gentamicin delivery from resorbable viscous hydrogels is therapeutically effective. Clin Orthop Relat Res 2015; 473:348-50. [PMID: 25300513 PMCID: PMC4390965 DOI: 10.1007/s11999-014-3992-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 09/30/2014] [Indexed: 02/06/2023]
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236
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Schmidt S, Heimesaat MM, Fischer A, Bereswill S, Melzig MF. Saponins increase susceptibility of vancomycin-resistant enterococci to antibiotic compounds. Eur J Microbiol Immunol (Bp) 2014; 4:204-12. [PMID: 25544893 DOI: 10.1556/eujmi-d-14-00029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 10/27/2014] [Indexed: 11/19/2022] Open
Abstract
The resistance of commensal bacteria to first and second line antibiotics has reached an alarming level in many parts of the world and endangers the effective treatment of infectious diseases. In this study, the influence of the plant-derived natural saponins glycyrrhizic acid, β-aescin, α-hederin, hederacoside C, and primulic acid 1 on the susceptibility of vancomycin-resistant enterococci (VRE) against antibiotics of clinical relevance was investigated in 20 clinical isolates. Furthermore, the antibacterial properties of saponins under study against VRE were determined in vitro. Results reveal that the susceptibility of VRE against gentamicin, teicoplanin, and daptomycin was enhanced in the presence of the saponin glycyrrhizic acid. Most importantly, glycyrrhizic acid (1 mg/ml) diminished the minimal inhibitory concentration (MIC) of gentamicin in gentamicin low-level intrinsic resistant VRE from 2 - >8 mg/l to ≤ 0.125-1 mg/l. The adding of β-aescin, α-hederin, hederacoside C, and primulic acid 1 to the antibiotics under study showed, compared to glycyrrhizic acid, less influence on the antibiotic potency. Only glycyrrhizic acid (1 mg/ml) and α‑hederin (0.2 mg/ml) showed weak antibacterial properties against the clinical isolates. Our study points towards a therapeutic potential of saponins in the coapplication with antibiotics for bacterial infections.
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237
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In vivo pharmacokinetics and pharmacodynamics of the lantibiotic NAI-107 in a neutropenic murine thigh infection model. Antimicrob Agents Chemother 2014; 59:1258-64. [PMID: 25512404 DOI: 10.1128/aac.04444-14] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
NAI-107 is a novel lantibiotic compound with potent in vitro activity against Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA). The purpose of this study was to examine the activity of NAI-107 against S. aureus strains, including MRSA, in the neutropenic murine thigh infection model. Serum pharmacokinetics were determined and time-kill studies were performed following administration of single subcutaneous doses of 5, 20, and 80 mg/kg body weight. The dose fractionation included total doses ranging from 1.56 to 400 mg/kg/72 h, divided into 1, 2, 3, or 6 doses. Studies of treatment effects against 9 S. aureus strains (4 methicillin-susceptible Staphylococcus aureus [MSSA] and 5 MRSA) using a 12-h dosing interval and total dose range of 1.56 to 400 mg/kg/72 h were also performed. A maximum effect (Emax) model was used to determine the pharmacokinetic/pharmacodynamic (PK/PD) index that best described the dose-response data and to estimate the doses required to achieve a net bacteriostatic dose (SD) and a 1-log reduction in CFU/thigh. The pharmacokinetic studies demonstrated an area under the concentration-time curve (AUC) range of 26.8 to 276 mg·h/liter and half-lives of 4.2 to 8.2 h. MICs ranged from 0.125 to 0.5 μg/ml. The 2 highest single doses produced more than a 2-log kill and prolonged postantibiotic effects (PAEs) ranging from 36 to >72 h. The dose fractionation-response curves were similar, and the AUC/MIC ratio was the most predictive PD index (AUC/MIC, coefficient of determination [R2]=0.89; maximum concentration of drug in serum [Cmax]/MIC, R2=0.79; time [T]>MIC, R2=0.63). A ≥2-log kill was observed against all 9 S. aureus strains. The total drug 24-h AUC/MIC values associated with stasis and a 1-log kill for the 9 S. aureus strains were 371±130 and 510±227, respectively. NAI-107 demonstrated concentration-dependent killing and prolonged PAEs. The AUC/MIC ratio was the predictive PD index. Extensive killing was observed for S. aureus organisms, independent of the MRSA status. The AUC/MIC target should be useful for the design of clinical dosing regimens.
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238
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Antibiotic stewardship challenges in the management of community-acquired infections for prevention of escalating antibiotic resistance. J Glob Antimicrob Resist 2014; 2:245-253. [DOI: 10.1016/j.jgar.2014.08.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 07/28/2014] [Accepted: 08/05/2014] [Indexed: 11/20/2022] Open
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239
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Antibacterial and EGFR-tyrosine kinase inhibitory activities of polyhydroxylated xanthones from Garcinia succifolia. Molecules 2014; 19:19923-34. [PMID: 25460314 PMCID: PMC6271254 DOI: 10.3390/molecules191219923] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 11/13/2014] [Accepted: 11/24/2014] [Indexed: 11/29/2022] Open
Abstract
Chemical investigation of the methanol extract of the wood of Garcinia succifolia Kurz (Clusiaceae) led to the isolation of 1,5-dihydroxyxanthone (1), 1,7-dihydroxyxanthone (2), 1,3,7-trihydroxyxanthone (3), 1,5,6-trihydroxyxanthone (4), 1,6,7-trihydroxyxanthone (5), and 1,3,6,7-tetrahydroxyxanthone (6). All of the isolated xanthones were evaluated for their antibacterial activity against bacterial reference strains, two Gram-positive (Staphylococcus aureus ATTC 25923, Bacillus subtillis ATCC 6633) and two Gram-negative (Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853), and environmental drug-resistant isolates (S. aureus B1, Enteroccoccus faecalis W1, and E. coli G1), as well as for their epidermal growth factor receptor (EGFR) of tyrosine kinase inhibitory activity. Only 1,5,6-trihydroxy-(4), 1,6,7-trihydroxy-(5), and 1,3,6,7-tetrahydroxyxanthones (6) exhibited antibacterial activity against Gram-positive bacteria, however none was active against vancomycin-resistant E. faecalis. Additionally, 1,7-dihydroxyxanthone (2) showed synergism with oxacillin, but not with ampicillin. On the other hand, only 1,5-dihydroxyxanthone (1) and 1,7-dihydroxyxanthone (2) were found to exhibit the EGFR-tyrosine kinase inhibitory activity, with IC50 values of 90.34 and 223 nM, respectively.
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240
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Qu D, Li J, Yang XH, Zhang ZD, Luo XX, Li MK, Li X. New biscoumarin derivatives: synthesis, crystal structure, theoretical study and antibacterial activity against Staphylococcus aureus. Molecules 2014; 19:19868-79. [PMID: 25460310 PMCID: PMC6271470 DOI: 10.3390/molecules191219868] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 10/23/2014] [Accepted: 10/29/2014] [Indexed: 11/28/2022] Open
Abstract
Five novel biscoumarins 1–5 were synthesized and characterized. In these compounds, two classical asymmetrical intramolecular O–H···O hydrogen bonds were used to stabilize the whole structures and the HB energies were performed with the density functional theory (DFT) [B3LYP/6-31G*] method. The five compounds were evaluated for their in vitro antibacterial activities against Staphylococcus aureus (S. aureus ATCC 29213), methicillin-resistant S. aureus (MRSA XJ 75302), vancomycin-intermediate S. aureus (Mu50 ATCC 700699), and USA 300 (Los Angeles County clone, LAC) by the means of minimum inhibitory concentration and time-kill curves.
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Affiliation(s)
- Di Qu
- Department of Pharmacology, School of Pharmacy, the Fourth Military Medical University, Xi'an 710032, China.
| | - Jing Li
- School of Chemistry and Chemical Engineering, Xi'an University, Xi'an 710065, China.
| | - Xiao-Hui Yang
- School of Chemistry and Chemical Engineering, Xi'an University, Xi'an 710065, China.
| | - Zi-Dan Zhang
- Department of Physics, School of Science, Tianjin University, Tianjin 300072, China.
| | - Xiao-Xing Luo
- Department of Pharmacology, School of Pharmacy, the Fourth Military Medical University, Xi'an 710032, China.
| | - Ming-Kai Li
- Department of Pharmacology, School of Pharmacy, the Fourth Military Medical University, Xi'an 710032, China.
| | - Xia Li
- Department of Neurosurgery, Xijing Hospital, the Fourth Military Medical University, Xi'an 710032, China.
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241
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Douros A, Grabowski K, Stahlmann R. Safety issues and drug–drug interactions with commonly used quinolones. Expert Opin Drug Metab Toxicol 2014; 11:25-39. [DOI: 10.1517/17425255.2014.970166] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Antonios Douros
- Charité-Universitätsmedizin Berlin, Department of Clinical Pharmacology and Toxicology, Charitéplatz 1, 10117 Berlin, Germany ;
| | - Katja Grabowski
- Charité-Universitätsmedizin Berlin, Department of Clinical Pharmacology and Toxicology, Charitéplatz 1, 10117 Berlin, Germany ;
| | - Ralf Stahlmann
- Charité-Universitätsmedizin Berlin, Department of Clinical Pharmacology and Toxicology, Charitéplatz 1, 10117 Berlin, Germany ;
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242
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A Head-to-Head Comparison of the Antimicrobial Activities of 30 Ultra-Short Antimicrobial Peptides Against Staphylococcus aureus, Pseudomonas aeruginosa and Candida albicans. Int J Pept Res Ther 2014. [DOI: 10.1007/s10989-014-9440-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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243
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Joshi T, Voo ZX, Graham B, Spiccia L, Martin LL. Real-time examination of aminoglycoside activity towards bacterial mimetic membranes using Quartz Crystal Microbalance with Dissipation monitoring (QCM-D). BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1848:385-91. [PMID: 25450807 DOI: 10.1016/j.bbamem.2014.10.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 09/03/2014] [Accepted: 10/14/2014] [Indexed: 10/24/2022]
Abstract
The rapid increase in multi-drug resistant bacteria has resulted in previously discontinued treatments being revisited. Aminoglycosides are effective "old" antibacterial agents that fall within this category. Despite extensive usage and understanding of their intracellular targets, there is limited mechanistic knowledge regarding how aminoglycosides penetrate bacterial membranes. Thus, the activity of two well-known aminoglycosides, kanamycin A and neomycin B, towards a bacterial mimetic membrane (DMPC:DMPG (4:1)) was examined using a Quartz Crystal Microbalance with Dissipation monitoring (QCM-D). The macroscopic effect of increasing the aminoglycoside concentration showed that kanamycin A exerts a threshold response, switching from binding to the membrane to disruption of the surface. Neomycin B, however, disrupted the membrane at all concentrations examined. At concentrations above the threshold value observed for kanamycin A, both aminoglycosides revealed similar mechanistic details. That is, they both inserted into the bacterial mimetic lipid bilayer, prior to disruption via loss of materials, presumably aminoglycoside-membrane composites. Depth profile analysis of this membrane interaction was achieved using the overtones of the quartz crystal sensor. The measured data is consistent with a two-stage process in which insertion of the aminoglycoside precedes the 'detergent-like' removal of membranes from the sensor. The results of this study contribute to the insight required for aminoglycosides to be reconsidered as active antimicrobial agents/co-agents by providing details of activity at the bacterial membrane. Kanamycin and neomycin still offer potential as antimicrobial therapeutics for the future and the QCM-D method illustrates great promise for screening new antibacterial or antiviral drug candidates.
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Affiliation(s)
- Tanmaya Joshi
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Zhi Xiang Voo
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Bim Graham
- Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Leone Spiccia
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
| | - Lisandra L Martin
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
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244
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Kerman DH, Deshpande AR. Gut microbiota and inflammatory bowel disease: the role of antibiotics in disease management. Postgrad Med 2014; 126:7-19. [PMID: 25141239 DOI: 10.3810/pgm.2014.07.2779] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Imbalances in the composition and number of bacteria in the gut microbiota have been implicated in inflammatory bowel disease (IBD), and modulation of the gut microbiota by probiotics and antibiotics in IBD has been an active area of research, with mixed results. This narrative review summarizes the findings of relevant publications identified using the PubMed database. Although antibiotics have been associated with an increased risk of IBD development and flares, several meta-analyses demonstrate that antibiotics are efficacious for the induction of remission and treatment of flares in patients with IBD. Data supporting their use include a large number of antibiotic studies in Crohn's disease and evidence suggests antibiotics are efficacious in both Crohn's disease and ulcerative colitis, although there are fewer studies of the latter. For Crohn's disease, antibiotics have been shown to be useful for the induction of remission and in the postoperative management of patients undergoing surgery. Additionally, patients with fistulizing disease, particularly perianal, can benefit from antibiotics administered short term. Both antimicrobials and probiotics have been shown to be useful for the treatment of pouchitis. Additional randomized controlled trials are needed to further elucidate the role of bacteria in IBD and to better inform clinicians about appropriate antibiotic therapies.
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Affiliation(s)
- David H Kerman
- Assistant Professor of Clinical Medicine, Division of Gastroenterology, University of Miami Miller School of Medicine, Miami, FL.
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245
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Rossolini GM, Arena F, Pecile P, Pollini S. Update on the antibiotic resistance crisis. Curr Opin Pharmacol 2014; 18:56-60. [DOI: 10.1016/j.coph.2014.09.006] [Citation(s) in RCA: 313] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 09/05/2014] [Indexed: 01/03/2023]
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246
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Li J, Hou Z, Li F, Zhang ZD, Zhou Y, Luo XX, Li MK. Synthesis, photoluminescent, antibacterial activities and theoretical studies of 4-hydroxycoumarin derivatives. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.07.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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247
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Singh S, Prasad P, Subramani R, Aalbersberg W. Production and purification of a bioactive substance against multi-drug resistant human pathogens from the marine-sponge-derived Salinispora sp. Asian Pac J Trop Biomed 2014. [DOI: 10.12980/apjtb.4.2014c1154] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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248
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Stratégies de réduction de l’utilisation des antibiotiques à visée curative en réanimation (adulte et pédiatrique). MEDECINE INTENSIVE REANIMATION 2014. [DOI: 10.1007/s13546-014-0916-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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249
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Schalk E, Färber J, Fischer T. Multidrug-Resistant Gram-Negative Bacteria in Hematology and Oncology. Infect Control Hosp Epidemiol 2014; 35:1203-4. [DOI: 10.1086/677646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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250
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Kim M, Otsubo R, Morikawa H, Nishide A, Takagi K, Sasakawa C, Mizushima T. Bacterial effectors and their functions in the ubiquitin-proteasome system: insight from the modes of substrate recognition. Cells 2014; 3:848-64. [PMID: 25257025 PMCID: PMC4197628 DOI: 10.3390/cells3030848] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 07/12/2014] [Accepted: 07/21/2014] [Indexed: 12/19/2022] Open
Abstract
Protein ubiquitination plays indispensable roles in the regulation of cell homeostasis and pathogenesis of neoplastic, infectious, and neurodegenerative diseases. Given the importance of this modification, it is to be expected that several pathogenic bacteria have developed the ability to utilize the host ubiquitin system for their own benefit. Modulation of the host ubiquitin system by bacterial effector proteins inhibits innate immune responses and hijacks central signaling pathways. Bacterial effectors mimic enzymes of the host ubiquitin system, but may or may not be structurally similar to the mammalian enzymes. Other effectors bind and modify components of the host ubiquitin system, and some are themselves subject to ubiquitination. This review will describe recent findings, based on structural analyses, regarding how pathogens use post-translational modifications of proteins to establish an infection.
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Affiliation(s)
- Minsoo Kim
- Division of Bacterial Infection Biology, Institute of Medical Science, The University of Tokyo, Shirokanedai 4-6-1, Minato-ku 4-6-1, Tokyo 108-8639, Japan.
| | - Ryota Otsubo
- Division of Bacterial Infection Biology, Institute of Medical Science, The University of Tokyo, Shirokanedai 4-6-1, Minato-ku 4-6-1, Tokyo 108-8639, Japan.
| | - Hanako Morikawa
- Division of Bacterial Infection Biology, Institute of Medical Science, The University of Tokyo, Shirokanedai 4-6-1, Minato-ku 4-6-1, Tokyo 108-8639, Japan.
| | - Akira Nishide
- Picobiology Institute, Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1, Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
| | - Kenji Takagi
- Picobiology Institute, Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1, Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
| | - Chihiro Sasakawa
- Division of Bacterial Infection Biology, Institute of Medical Science, The University of Tokyo, Shirokanedai 4-6-1, Minato-ku 4-6-1, Tokyo 108-8639, Japan.
| | - Tsunehiro Mizushima
- Picobiology Institute, Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1, Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
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