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https://www.readbyqxmd.com/read/28203232/cationic-net-charge-and-counter-ion-type-as-antimicrobial-activity-determinant-factors-of-short-lipopeptides
#1
Katarzyna E Greber, Malgorzata Dawgul, Wojciech Kamysz, Wieslaw Sawicki
To get a better insight into the antimicrobial potency of short cationic lipopeptides, 35 new entities were synthesized using solid phase peptide strategy. All newly obtained lipopeptides were designed to be positively charged from +1 to +4. This was achieved by introducing basic amino acid - lysine - into the lipopeptide structure and had a hydrophobic fatty acid chain attached. Lipopeptides were subjected to microbiological tests using reference strains of Gram-negative bacteria: Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris, Pseudomonas aeruginosa, Gram-positive bacteria: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis, Enterococcus faecalis, and fungi: Candida albicans, Candida tropicalis, Aspergillus brasiliensis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28192532/role-of-arf-gtpases-in-fungal-morphogenesis-and-virulence
#2
Hayet Labbaoui, Stéphanie Bogliolo, Vikram Ghugtyal, Norma V Solis, Scott G Filler, Robert A Arkowitz, Martine Bassilana
Virulence of the human fungal pathogen Candida albicans depends on the switch from budding to filamentous growth, which requires sustained membrane traffic and polarized growth. In many organisms, small GTPases of the Arf (ADP-ribosylation factor) family regulate membrane/protein trafficking, yet little is known about their role in fungal filamentous growth. To investigate these GTPases in C. albicans, we generated loss of function mutants in all 3 Arf proteins, Arf1-Arf3, and 2 Arf-like proteins, Arl1 and Arl3...
February 13, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28186162/multilocus-sequence-analyses-reveal-extensive-diversity-and-multiple-origins-of-fluconazole-resistance-in-candida-tropicalis-from-tropical-china
#3
Jin-Yan Wu, Hong Guo, Hua-Min Wang, Guo-Hui Yi, Li-Min Zhou, Xiao-Wen He, Ying Zhang, Jianping Xu
Candida tropicalis is among the most prevalent human pathogenic yeast species, second only to C. albicans in certain geographic regions such as East Asia and Brazil. However, compared to C. albicans, relatively little is known about the patterns of genetic variation in C. tropicalis. This study analyzed the genetic diversity and relationships among isolates of C. tropicalis from the southern Chinese island of Hainan. A total of 116 isolates were obtained from seven geographic regions located across the Island...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183985/characterization-of-pph3-mediated-dephosphorylation-of-rad53-during-methyl-methanesulfonate-induced-dna-damage-repair-in-candida-albicans
#4
Guangyin Yao, Junhua Wan, Qizheng Liu, Chunhua Mu, Yue Wang, Jianli Sang
Genotoxic stress causes DNA damage or stalled DNA replication and filamentous growth in the pathogenic fungus Candida albicans The DNA checkpoint kinase Rad53 critically regulates by phosphorylation effectors that execute the stress response. Rad53 itself is activated by phosphorylation and inactivated by dephosphorylation. Previous studies have suggested that the phosphatase Pph3 dephosphorylates Rad53. Here, we used mass spectrometry and mutagenesis to identify Pph3 dephosphorylation sites on Rad53 in C. albicans We found that serine residues 351, 461, and 477, which were dephosphorylated in wild-type cells during the recovery from DNA damage caused by methyl methanesulfonate (MMS), remained phosphorylated in pph3Δ/Δ cells...
February 9, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28182579/synthesis-and-biological-evaluation-of-newer-1-3-4-oxadiazoles-incorporated-with-benzothiazepine-and-benzodiazepine-moieties
#5
Patel Navin, Patel Sarvil, Purohit Amit, Patel Divyesh, Rajani Dhansukh, Rosa Moo-Puc, Gildardo Rivera
A series of thiazepines and diazepines having 1,3,4-oxadiazole moiety were synthesized, and they were analyzed for their in vitro antimicrobial activity against several bacteria (Staphylococcus aureus, Staphylococcus pyogenes, Escherichia coli, and Pseudomonas aeruginosa) and fungi (Candida albicans, Aspergillus niger, and Aspergillus Clavatus) and protozoa (Entamoeba histolytica, Giardia lamblia, Trypanosoma cruzi and Leishmania mexicana). Few of the selected compounds were tested for their antitubercular activity...
February 9, 2017: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/28179900/production-of-potent-antimicrobial-compounds-from-streptomyces-cyaneofuscatus-associated-with-fresh-water-sediment
#6
Zothanpuia, Ajit K Passari, Preeti Chandra, Vincent V Leo, Vineet K Mishra, Brijesh Kumar, Bhim P Singh
The genus Streptomyces under phylum actinobacteria has been recognized as a prolific source for the production of bioactive secondary metabolites. An actinobacterial strain designated as DST103 isolated from a wetland fresh water sediment of Tamdil Lake, Mizoram, Northeast, India was identified as Streptomyces cyaneofuscatus (KY287599) using 16SrRNA gene sequencing which shares 99.87% sequence similarity with Streptomyces cyaneofuscatus NRRL B-2570 (T) . The strain showed broad spectrum antimicrobial activities against Gram negative bacteria (Escherichia coli MTCC 739 and Pseudomonas aeruginosa MTCC 2453), Gram positive bacteria (Micrococcus luteus NCIM 2170 and Staphylococcus aureus MTCC 96) and yeast pathogen Candida albicans MTCC 3017)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28178357/enzyme-engineering-a-synthetic-biology-approach-for-more-effective-library-generation-and-automated-high-throughput-screening
#7
Daniela Quaglia, Maximilian C C J C Ebert, Paul F Mugford, Joelle N Pelletier
The Golden Gate strategy entails the use of type IIS restriction enzymes, which cut outside of their recognition sequence. It enables unrestricted design of unique DNA fragments that can be readily and seamlessly recombined. Successfully employed in other synthetic biology applications, we demonstrate its advantageous use to engineer a biocatalyst. Hot-spots for mutations were individuated in three distinct regions of Candida antarctica lipase A (Cal-A), the biocatalyst chosen as a target to demonstrate the versatility of this recombination method...
2017: PloS One
https://www.readbyqxmd.com/read/28167306/non-receptor-type-proline-rich-protein-tyrosine-kinase-2-pyk2-is-a-possible-therapeutic-target-for-kawasaki-disease
#8
Chinatsu Suzuki, Akihiro Nakamura, Noriko Miura, Kunityoshi Fukai, Naohito Ohno, Tomoyo Yahata, Akiko Okamoto-Hamaoka, Maiko Fujii, Ayako Yoshioka, Yuki Kuchitsu, Kazuyuki Ikeda, Kenji Hamaoka
Kawasaki disease (KD) is a paediatric vasculitis whose pathogenesis remains unclear. Based on experimental studies using a mouse model for KD, we report here that proline-rich protein tyrosine kinase 2 (Pyk2) plays a critical role in the onset of KD-like murine vasculitis. The mouse model for KD was prepared by administrating a Candida albicans water-soluble fraction (CAWS).Unlike CAWS-treated WT mice, CAWS-treated Pyk2-Knockout (Pyk2-KO) mice did not develop apparent vasculitis. A sustained increase in MIG/CXCL9 and IP-10/CXCL10, both of which have potent "angiostatic" activity, was observed in CAWS-treated Pyk2-KO mice...
February 3, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28161744/burden-of-serious-fungal-infections-in-bangladesh
#9
H C Gugnani, D W Denning, R Rahim, A Sadat, M Belal, M S Mahbub
In Bangladesh there are several published papers on superficial mycoses. Deep mycoses are also recognized as an important emerging problem. Here, we estimate the annual incidence and prevalence of serious fungal infections in Bangladesh. Demographic data were obtained from world population reports and the data on TB and HIV extracted from the online publications on tuberculosis in Bangladesh and Asia Pacific research statistical data information resources AIDS Data HUB. All the published papers on fungal infections in Bangladesh were identified through extensive search of literature...
February 4, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28155624/past-recent-progresses-and-future-perspectives-of-nanotechnology-applied-to-antifungals-agents
#10
Luís Roque, Jesús Molpeceres, Cláudia Reis, Patrícia Rijo, Catarina Pinto Reis
Candida species remain a significant cause of nosocomial bloodstream infections, associated with prolonged hospital stay in the ICU and high healthcare cost. The incidence of Candida is very high in certain risk groups of patients (AIDS, diabetes, cancer, etc.). Recent developments of nanotechnology have strongly contributed to the design of new multifunctional drug carriers that improve drug bioavailability through a controlled and prolonged release profile or even through a more specific targeted delivery of the antifungal agent...
February 1, 2017: Current Drug Metabolism
https://www.readbyqxmd.com/read/28154553/identification-and-antifungal-susceptibility-profiles-of-candida-nivariensis-and-candida-bracarensis-in-a-multi-center-chinese-collection-of-yeasts
#11
Xin Hou, Meng Xiao, Sharon C-A Chen, He Wang, Shu-Ying Yu, Xin Fan, Fanrong Kong, Ying-Chun Xu
Candida nivariensis and C. bracarensis are two emerging cryptic species within the C. glabrata complex. Thirteen of these isolates from 10 hospitals in China were studied for their species identification and antifungal susceptibilities. Phenotypic and molecular [rDNA ITS sequencing, D1/D2 sequencing and ITS sequencer-based capillary gel electrophoresis (SCGE)] and matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) MS identification methods were compared for their performance in species identification...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28154258/the-risk-of-microbial-contamination-in-multiple-dose-preservative-free-ophthalmic-preparations
#12
Atsuyuki Saisyo, Rima Shimono, Shigeharu Oie, Kazuhiro Kimura, Hiroyuki Furukawa
Multiple-dose ophthalmic preparations that do not contain preservatives carry high risks of microbial contamination. However, there are various types of hospital preparations, with different physicochemical properties. In the present study, we evaluated the association between physicochemical properties and microbial contamination in ophthalmic preparations. The investigated hospital preparations included ophthalmic preparations of physiological saline, 0.2% fluconazole, 0.5% vancomycin hydrochloride, and 2% cyclosporine...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28149831/repurposing-approach-identifies-auranofin-with-broad-spectrum-antifungal-activity-that-targets-mia40-erv1-pathway
#13
Shankar Thangamani, Matthew Maland, Haroon Mohammad, Pete E Pascuzzi, Larisa Avramova, Carla M Koehler, Tony R Hazbun, Mohamed N Seleem
Current antifungal therapies have limited effectiveness in treating invasive fungal infections. Furthermore, the development of new antifungal is currently unable to keep pace with the urgent demand for safe and effective new drugs. Auranofin, an FDA-approved drug for the treatment of rheumatoid arthritis, inhibits growth of a diverse array of clinical isolates of fungi and represents a new antifungal agent with a previously unexploited mechanism of action. In addition to auranofin's potent antifungal activity against planktonic fungi, this drug significantly reduces the metabolic activity of Candida cells encased in a biofilm...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28149227/epidemiology-of-nosocomial-fungal-infections-in-the-national-center-for-burns-in-casablanca-morocco
#14
A Rafik, M Diouri, N Bahechar, A Chlihi
Fungal infection is a leading cause of death in burns patients and incurs significant costs for burn units. Our aim was to determine epidemiology of these infections, and analyze risk factors in the burns intensive care unit of the National Center for Burns and Plastic Surgery at Ibn-Rochd University Hospital, Casablanca. It is a retrospective review of all patients admitted from 2011-2014 who developed cultures positive for fungal organisms. Criteria for nosocomial fungal infections were those of the Center for Disease Control in Atlanta (1988, revised 1992, 2004)...
June 30, 2016: Annals of Burns and Fire Disasters
https://www.readbyqxmd.com/read/28148273/prevalence-of-candida-albicans-and-non-albicans-on-the-tongue-dorsa-of-elderly-people-living-in-a-post-disaster-area-a-cross-sectional-survey
#15
Toshiro Sato, Mitsuo Kishi, Miki Suda, Kiyomi Sakata, Haruki Shimoda, Hiroyuki Miura, Akira Ogawa, Seiichiro Kobayashi
BACKGROUND: Candida species are normal commensal organisms of the mouth. However, they can cause oral mucosal and severe systemic infections in persons with reduced immune function, which is common in the very elderly. In post-disaster areas, the number of elderly residents rapidly increases due to the outflow of younger generations. Hence, we examined the prevalence of Candida albicans and non-albicans in association with oral and systemic conditions, life style, medications, and living conditions...
February 1, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28139856/epidemiological-investigation-of-candida-species-causing-bloodstream-infection-in-paediatric-small-bowel-transplant-recipients
#16
Mallory J Suhr, João Carlos Gomes-Neto, Nabaraj Banjara, Diana F Florescu, David F Mercer, Peter C Iwen, Heather E Hallen-Adams
Small bowel transplantation (SBT) can be a life-saving medical procedure. However, these recipients experience high risk of bloodstream infections caused by Candida. This research aims to characterise the SBT recipient gut microbiota over time following transplantation and investigate the epidemiology of candidaemia in seven paediatric patients. Candida species from the recipients' ileum and bloodstream were identified by internal transcribed spacer sequence and distinguished to strain by multilocus sequence typing and randomly amplified polymorphic DNA...
January 31, 2017: Mycoses
https://www.readbyqxmd.com/read/28135328/blocking-two-component-signalling-enhances-candida-albicans-virulence-and-reveals-adaptive-mechanisms-that-counteract-sustained-sapk-activation
#17
Alison M Day, Deborah A Smith, Mélanie A C Ikeh, Mohammed Haider, Carmen M Herrero-de-Dios, Alistair J P Brown, Brian A Morgan, Lars P Erwig, Donna M MacCallum, Janet Quinn
The Ypd1 phosphorelay protein is a central constituent of fungal two-component signal transduction pathways. Inhibition of Ypd1 in Saccharomyces cerevisiae and Cryptococcus neoformans is lethal due to the sustained activation of the 'p38-related' Hog1 stress-activated protein kinase (SAPK). As two-component signalling proteins are not found in animals, Ypd1 is considered to be a prime antifungal target. However, a major fungal pathogen of humans, Candida albicans, can survive the concomitant sustained activation of Hog1 that occurs in cells lacking YPD1...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28131069/oral-candidal-speciation-virulence-and-antifungal-susceptibility-in-type-2-diabetes-mellitus
#18
Pratik N Patel, Parul Sah, Chetana Chandrashekar, Sudha Vidyasagar, J Venkata Rao, Mradul Tiwari, Raghu Radhakrishnan
OBJECTIVES: To determine the oral candidal carriage (OCC), activity of virulent factors and fluconazole susceptibility in subjects with type 2 diabetes mellitus (T2DM) and investigate their association with HbA1c measurements. MATERIALS AND METHODS: A cross sectional study was conducted on 100 diabetics and 100 healthy volunteers. The virulence was assessed by measuring the phospholipase activity and proteolysis index. Fluconazole susceptibility was performed using the gradient diffusion method...
January 17, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28120126/a-high-throughput-screening-procedure-for-enhancing-pyruvate-production-in-candida-glabrata-by-random-mutagenesis
#19
Zhengshan Luo, Weizhu Zeng, Guocheng Du, Song Liu, Fang Fang, Jingwen Zhou, Jian Chen
Candida glabrata is one of the most promising pyruvate producers. A series of experiments was conducted to enhance pyruvate production by C. glabrata via metabolic and genetic engineering. Here, a novel screening strategy, which combined atmospheric and room temperature plasma-based random mutagenesis and high-throughput screening (HTS), was used to screen for high pyruvate-producing mutants that could use cheap industrial raw materials as nitrogen sources. A high-titer pyruvate producer (H6) was obtained form 30,000 mutants after 30 rounds of mutagenesis and HTS...
January 24, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28115357/synthesis-antifungal-activity-and-biocompatibility-of-novel-dabco-compounds-and-dabco-containing-denture-base-resins
#20
Jenny L Herman, Yapin Wang, Elizabeth Lilly, Thomas Lallier, Suleiman Hamdan, Xiaoming Xu, Paul L Fidel, Mairi C Noverr
The fungal pathogen Candida albicans causes a variety of oral infections including denture stomatitis, which is characterized by inflammation of the oral mucosa in direct contact with dentures, and affects a significant number of otherwise healthy denture wearers. While antifungal treatment reduces symptoms, infections are often recurrent. One strategy to address this problem is to incorporate compounds with fungicidal activities into denture materials to prevent colonization. Our laboratory synthesized novel derivatives of DABCO (1,4-diazabicyclo[2...
January 23, 2017: Antimicrobial Agents and Chemotherapy
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