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https://www.readbyqxmd.com/read/29786960/the-atomic-resolution-structure-of-a-class-c-%C3%AE-lactamase-and-of-its-complex-with-avibactam
#1
Stefano Mangani, Cecilia Pozzi, Flavio Di Pisa, Filomena De Luca, Manuela Benvenuti, Jean-Denis Docquier
β-lactamases (BLs) are important antibiotic resistance determinants that significantly compromise the efficacy of valuable β-lactam antibacterial drugs. For that reason, combinations with β-lactamase inhibitor were developed. Avibactam is the first non-β-lactam BL inhibitor introduced in clinical practice. Ceftazidime-avibactam represents one of the few last-resort antibiotics available for the treatment of infections caused by near pandrug-resistant bacteria. TRU-1 is a chromosomally-encoded AmpC-type BL of Aeromonas enteropelogenes, related to the FOX-type BLs and constitutes a good model for class C BLs...
May 22, 2018: ChemMedChem
https://www.readbyqxmd.com/read/29786847/assessment-of-antibiotic-susceptibility-within-lactic-acid-bacteria-and-coagulase-negative-staphylococci-isolated-from-hunan-smoked-pork-a-naturally-fermented-meat-product-in-china
#2
Jing Wang, Xinyuan Wei, Mingtao Fan
The aim of this study was to evaluate the antibiotic susceptibility of lactic acid bacteria (LAB) and coagulase-negative staphylococci (CNS) strains isolated from naturally fermented smoked pork produced in Hunan, China. A total of 48 strains were isolated by selective medium and identified at the species level by 16S rRNA gene sequencing as follows: Staphylococcus carnosus (23), Lactobacillus plantarum (12), Lactobacillus brevis (10), Lactobacillus sakei (1), Weissella confusa (1), and Weissella cibaria (1)...
May 22, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29785534/an-enzyme-free-homogenous-electrochemical-assay-for-sensitive-detection-of-the-plasmid-mediated-colistin-resistance-gene-mcr-1
#3
Bo Li, Zhixin Chai, Xiaohui Yan, Chunchen Liu, Bo Situ, Ye Zhang, Weilun Pan, Shihua Luo, Jianhua Liu, Lei Zheng
Antibiotic resistance associated with the mcr-1 gene of Gram-negative bacteria, which confers resistance to drugs of last resort and has the potential to spread via plasmids, is one of the most pressing issues facing global health today. Point-of-care testing for the mcr-1 gene is needed to aid in the identification of colistin resistance in the field and to control its horizontal transmission. Here, we report the successful development of an enzyme-free homogenous electrochemical strategy for sensitive detection of the antibiotic resistance gene mcr-1 using the hybridization chain reaction and mcr-1-specific toehold probe...
May 22, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29785529/isolation-and-characterization-of-bacillus-sp-gfp-2-a-novel-bacillus-strain-with-antimicrobial-activities-from-whitespotted-bamboo-shark-intestine
#4
Jia Wu, Guoqiang Xu, Yangyang Jin, Cong Sun, Li Zhou, Guodong Lin, Rong Xu, Ling Wei, Hui Fei, Dan Wang, Jianqing Chen, Zhengbing Lv, Kuancheng Liu
The abuse of antibiotics and following rapidly increasing of antibiotic-resistant pathogens is the serious threat to our society. Natural products from microorganism are regarded as the important substitution antimicrobial agents of antibiotics. We isolated a new strain, Bacillus sp. GFP-2, from the Chiloscyllium plagiosum (Whitespotted bamboo shark) intestine, which showed great inhibitory effects on the growth of both Gram-positive and Gram-negative bacteria. Additionally, the growth of salmon was effectively promoted when fed with inactivated strain GFP-2 as the inhibition agent of pathogenic bacteria...
May 22, 2018: AMB Express
https://www.readbyqxmd.com/read/29785480/potential-treatment-options-in-a-post-antibiotic-era
#5
R R Bragg, C M Meyburgh, J-Y Lee, M Coetzee
Following the Golden Age of antibiotic discovery in the previous century, the rate of antibiotic discovery has plummeted during the past 50 years while the incidence of antimicrobial resistance is ever-increasing. Presently, humankind is forced to address a major public health threat in the form of multiple drug resistance and urgent action is required to halt the advent of a post-antibiotic era. This chapter aims to draw the attention to the escalating global crisis of antimicrobial resistance fueled by the irresponsible use of antibiotics in healthcare and animal production sectors...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29785215/mycobacteriosis-and-tuberculosis-laboratory-diagnosis
#6
REVIEW
Davood Azadi, Tahereh Motallebirad, Kazem Ghaffari, Hasan Shojaei
Background: Tuberculosis is one of the most important infectious diseases that has claimed its victims throughout much of known human history. With Koch's discovery of the tubercle bacillus as the etiologic agent of the disease, his sanitary and hygienic measures, which were based on his discovery and the development of a vaccine against tuberculosis by Albert Calmette and Camille Guérin in 1921, an attenuated Mycobacterium bovis strain, bacilli Calmette-Guérin (BCG), and the discovery of the first antibiotic against tuberculosis, streptomycin by Selman Waksman in 1943, soon led to the opinion that appropriate control measures had become available for tuberculosis and it had been assumed that the disease could ultimately be eradicated...
2018: Open Microbiology Journal
https://www.readbyqxmd.com/read/29785214/etiological-trends-and-patterns-of-antimicrobial-resistance-in-respiratory-infections
#7
Salma M Al-Zain Ahmed, Sara S Abdelrahman, Doua M Saad, Isra S Osman, Modasir G Osman, Eltahir A G Khalil
Background: Respiratory infections are one of the commonest causes of morbidity and mortality related to infectious diseases worldwide. The emergence of antimicrobial resistance is a major global health problem which is well established in developing countries. Good clinical suspicion and correct laboratory identification of respiratory infection causing organisms followed by the appropriate management are needed to compact both community-acquired and nosocomial infection respiratory infections...
2018: Open Microbiology Journal
https://www.readbyqxmd.com/read/29785070/analysis-of-antibiotics-resistant-genes-in-different-strains-of-staphylococcus-aureus
#8
Benson Otarigho, Mofolusho O Falade
The control of Staphylococcus aureus infection is being hampered by methicillin and other resistant strains. The identification of the unique antibiotic resistant genes from the genomes of various strains of S. aureus is of interest. We analyzed 11 S. aureus genomes sequences for Antibiotics Resistance Genes (ARGs) using CARD 2017 platform. We identified 32 ARGs across 11 S. aureus strains. Tet(38), norB, lmrB, mepA and mepR were present across genomes except for S. aureus strain UTSW MRSA 55. The mepA and mepR were found across 11 different genomes...
2018: Bioinformation
https://www.readbyqxmd.com/read/29784849/evaluation-of-telavancin-alone-and-combined-with-ceftaroline-or-rifampin-against-methicillin-resistant-staphylococcus-aureus-mrsa-in-an-in-vitro-biofilm-model
#9
Seyedehameneh Jahanbakhsh, Nivedita B Singh, Juwon Yim, Warren E Rose, Michael J Rybak
Biofilm-producing methicillin-resistant Staphylococcus aureus (MRSA) infections are challenging due to increasing antibiotic resistance. Synergistic activity of lipopeptides and lipoglycopeptides with β-lactams has been demonstrated for MRSA, but little is known about biofilm-embedded organisms. Our objective was to evaluate two telavancin (TLV) dosage regimens (7.5 mg/kg and 10 mg/kg q 24h)alone and in combination with ceftaroline (CPT) (600 mg q 8 h) or rifampin (RIF) (450 mg q 12h) against two biofilm-producing MRSA (494 and N315)...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784845/interaction-of-bacterial-phenazines-with-colistimethate-in-bronchial-epithelial-cells
#10
Valeri V Mossine, Deborah L Chance, James K Waters, Thomas P Mawhinney
Multidrug-resistant bacterial infections are being increasingly treated in clinics with polymyxins, a class of antibiotics associated with adverse effects in the kidney, nervous system, or airways of a significant proportion of human and animal patients. Although many of the resistant pathogens display enhanced virulence, a hazard of cytotoxic interactions between polymyxin antibiotics and bacterial virulence factors (VFs) has not been assessed, to date. We report here on testing paired combinations of four Pseudomonas aeruginosa VF phenazine toxins, pyocyanin (PYO), 1-hydroxyphenazine (1-HP), phenazine-1-carboxylic acid (PCA), phenazine-1-carboxamide (PCN), and two commonly prescribed polymyxin drugs, colistimethate (CMS)/colistin and polymyxin B, in three human airway cell lines, BEAS-2B, HBE-1, and CFT-1...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784838/in-vivo-and-in-vitro-effects-of-a-clpp-activating-antibiotic-against-vancomycin-resistant-enterococci
#11
Autumn Brown Gandt, Elizabeth C Griffith, Ida M Lister, Lisa L Billings, Angel Han, Rajendra Tangallapally, Ying Zhao, Aman P Singh, Richard E Lee, Michael D LaFleur
Antibiotics with novel bactericidal mechanisms of action are urgently needed. The antibiotic acyldepsipeptide 4 (ADEP4) activates the ClpP protease and causes cells to self-digest. The effects of ADEP4 and ClpP activation have not been sufficiently characterized for the enterococci, which are important pathogens known for high levels of acquired and intrinsic antibiotic resistance. In the present study, ADEP4 was found to be potently active against both Enterococcus faecalis and Enterococcus faecium with an MIC90 of 0...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784837/the-inoculum-effect-in-the-era-of-multidrug-resistance-minor-differences-in-inoculum-have-dramatic-effect-on-minimal-inhibitory-concentration-determination
#12
Kenneth P Smith, James E Kirby
The observed MIC may depend on the number of bacteria initially inoculated into the assay. This phenomenon is termed the inoculum effect (IE) and is often most pronounced for β-lactams in strains expressing β-lactamase enzymes. The Clinical and Laboratory Standards Institute (CLSI) recommended inoculum is 5 x 105 CFU mL-1 with an acceptable range of 2-8 x 105 CFU mL-1 IE testing is typically performed using an inoculum 100-fold greater than the CLSI recommended inoculum. Therefore, it remains unknown whether the IE influences MICs during testing performed according to CLSI guidelines...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784271/boronic-acid-inhibitors-of-the-class-a-%C3%AE-lactamase-kpc-2
#13
Jingyuan Zhou, Paul Stapleton, Shozeb Haider, Jess Healy
The rapid rise of antimicrobial resistance is one of the greatest challenges currently facing medical science. The most common cause of resistance to β-lactam antibiotics is the expression of β-lactamase enzymes, such as KPC-2. As such the development of novel inhibitors of KPC-2 and related enzymes is of the upmost importance. We report the design and synthesis of novel boronic acid transition state analogs containing a 1,4-substituted 1,2,3-triazole linker based on the known inhibitor 3-nitrophenyl boronic acid and demonstrate that they are promising scaffolds for the development inhibitors of KPC-2 with the ability to recover sensitivity to the antibiotic cefotaxime...
April 27, 2018: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29784062/multidrug-resistant-proteus-mirabilis-and-escherichia-coli-causing-fulminant-necrotising-fasciitis-a-case-report
#14
Eugene Vernyuy Yeika, Joyce Bei Foryoung, Derrick Tembi Efie, Eugene Adze Nkwetateba, Paul Nkemtendong Tolefac, Marcelin Ngowe Ngowe
BACKGROUND: Necrotizing fasciitis is a rare soft tissue infection characterized by rapid progressive necrosis with relative sparing of underlying muscles. This case is reported to highlight the emergence of multidrug resistant microbes in recent days which limits the use of empiric antibiotic therapy and necessitates early cultures and sensitivity enabling targeted antibiotic therapy. Factors that lead to antimicrobial resistance especially in sub-Saharan Africa have also been discussed...
May 21, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29783937/enterococcus-gallinarum-meningitis-a-case-report-and-literature-review
#15
Bo Zhao, Mao Sheng Ye, Rui Zheng
BACKGROUND: As an opportunistic pathogen, E. gallinarum mainly leads to nosocomial infections, and it's multi-drug resistance has gained more and more attention. Central nervous system infections caused by E. gallinarum are rare, but have been reported more often in recent years. The previous cases were generally secondary to neurosurgery, especially ventriculoperitoneal shunts. In recent years, the cases largely occurred in patients with impaired immune function. The patient in our report may have had dual risk factors (immune impairment and an invasive surgical procedure)...
May 21, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29783881/lemierre-s-syndrome-a-case-study-with-a-short-review-of-literature
#16
Ken De Smet, Paul-Emile Claus, Gudrun Alliet, An Simpelaere, Geert Desmet
Objective and Importance Lemierre's syndrome (LS) is a rare condition that typically starts with a bacterial oropharyngeal infection complicated by a thrombophlebitis of the internal jugular vein and septic emboli to the lungs or other organs. The most common organism isolated is Fusobacterium necrophorum, although other causative organisms are isolated in rare cases. Case presentation We discuss a case of LS in a 44-year-old, previously healthy man presenting with an oropharyngeal infection. F. necrophorum was isolated from blood cultures and Computed tomography of the chest demonstrated septic emboli in the lungs...
May 21, 2018: Acta Clinica Belgica
https://www.readbyqxmd.com/read/29783685/novel-imidazole-aldoximes-with-broad-spectrum-antimicrobial-potency-against-multidrug-resistant-gram-negative-bacteria
#17
Mirjana Skočibušić, Renata Odžak, Alma Ramić, Tomislav Smolić, Tomica Hrenar, Ines Primožič
In the search for a new class of potential antimicrobial agents, five novel N -substituted imidazole 2-aldoximes and their six quaternary salts were evaluated. The antimicrobial activity was assessed against a panel of representative Gram-positive and Gram-negative bacteria, including multidrug resistant bacteria. All compounds demonstrated potent in vitro activity against the tested microorganisms, with MIC values ranging from 6.25 to 50.0 μg/mL. Among the tested compounds, two quaternary compounds ( N -but-3-enyl- and meta - ( 10 ) or para - N -chlorobenzyl ( 11 ) imidazolium 2-aldoximes) displayed the most potent and broad-spectrum activity against both Gram-positive and Gram-negative bacterial strains...
May 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29783023/extended-spectrum-beta-lactamase-producing-enterobacteriaceae-infections-in-haematopoietic-stem-cell-transplant-recipients-epidemiology-and-molecular-characterization
#18
Molka Kharrat, Yosra Chebbi, Farah Ben Tanfous, Amel Lakhal, Saloua Ladeb, Tarek Ben Othmen, Wafa Achour
BACKGROUND: Extended spectrum β-lactamase producing Enterobacteriaceae (ESBL-E) are feared because they generate therapeutic difficulties and have high potential for dissemination. The purpose of our study was to investigate the epidemiology of these infections in hematopoietic stem cell transplant (HSCT) recipients and to determine the genes encoding ESBL. MATERIAL/METHODS: Our retrospective study concerned adult patients hospitalized at the National Bone Marrow Transplant Center and infected with ESBL-E post HSCT between january 2006 and december 2016...
May 18, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29782954/comparison-between-disk-diffusion-and-agar-dilution-methods-to-determine-in-vitro-susceptibility-of-corynebacterium-spp-clinical-isolates-and-update-of-their-susceptibility
#19
Claudia Barberis, Eugenia Sandoval, Carlos Hernán Rodriguez, María Soledad Ramírez, Angela Famiglietti, Marisa Almuzara, Carlos Vay
INTRODUCTION: Although Corynebacterium species are part of the skin and mucous membranes microbiota, human infections caused by Corynebacterium spp. have been reported and the multidrug resistance pattern of the recovered isolates was emphasized. Due to the usefulness of disk diffusion in daily practice, the purpose of this work was to compare disk diffusion against agar dilution to determine disk diffusion breakpoints and to review the antimicrobial susceptibility of the most frequent Corynebacterium spp...
May 18, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29782818/antimicrobial-activity-profiles-of-amphiphilic-xanthone-derivatives-are-a-function-of-their-molecular-oligomerization
#20
Jun-Jie Koh, Shuimu Lin, Yang Bai, Wendy Wan Ling Sin, Thet Tun Aung, Jianguo Li, Verma Chandra, Konstantin Pervushin, Roger W Beuerman, Shouping Liu
Currently, membrane-targeting small antimicrobial peptidomimetics (SAP) are important in antibiotic development because bacteria appear to develop resistance to these surface-active compounds less readily. However, the molecular membrane-targeting action of SAPs has received little attention. In this study, we investigated the effect of oligomerization of amphiphilic xanthone, a model SAP, on its antimicrobial properties against both Gram-positive and Gram-negative bacteria. First, oligomer formation by an amphiphilic xanthone, compound 2 (also coded as AM052), was investigated via solution-state nuclear magnetic resonance (NMR) spectroscopy...
May 18, 2018: Biochimica et Biophysica Acta
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