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https://www.readbyqxmd.com/read/28544098/crystal-structure-of-the-sensor-domain-of-baes-from-serratia-marcescens-fs14
#1
Ya Zhang, Shenshen Qiu, Shanshan Jia, Dongqing Xu, Tingting Ran, Weiwu Wang
The sensor histidine kinases of two-component signal-transduction systems (TCSs) are essential for bacteria to adapt to variable environmental conditions. The two-component regulatory system BaeS/R increases multidrug and metal resistance in Salmonella and Escherichia coli. In this study, we report the X-ray structure of the periplasmic sensor domain of BaeS from Serratia marcescens FS14. The BaeS sensor domain (34-160) adopts a mixed α/β-fold containing a central four-stranded antiparallel β-sheet flanked by a long N-terminal α-helix and additional loops and a short C-terminal α-helix on each side...
May 24, 2017: Proteins
https://www.readbyqxmd.com/read/28538674/biosynthesis-of-zno-nanoparticles-by-a-new-pichia-kudriavzevii-yeast-strain-and-evaluation-of-their-antimicrobial-and-antioxidant-activities
#2
Amin Boroumand Moghaddam, Mona Moniri, Susan Azizi, Raha Abdul Rahim, Arbakariya Bin Ariff, Wan Zuhainis Saad, Farideh Namvar, Mohammad Navaderi
The potential ability of a new yeast strain, Pichia kudriavzevii, in the synthesis of zinc oxide nanoparticles (ZnO-NPs) through a green method was explored in this study. The effect of reaction time (12, 24 and 36 h) on the structure of the resulting ZnO nanoparticles was investigated. From the XRD and TEM results, the ZnO-NPs with a hexagonal wurtzite structure and a particle crystal size of ~10-61 nm was formed at different reaction times. Combing XRD, TEM, and PL results, it was revealed that the sample prepared at intermediate duration (24 h) has the most favorable nanosized structure with the lowest defect concentration...
May 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28536964/biosynthesis-of-heliotropin-by-a-novel-strain-of-serratia-liquefaciens
#3
Mingtao Zhao, Pu Zheng, Pengcheng Chen, Siqin Liu
The present study has been conducted towards isolation of bacteria capable of producing heliotropin via microbial conversion. Strain ZMT-1 capable of synthesizing heliotropin efficiently was obtained by enrichment culture of soil samples and a high-throughput screening method, and identified as Serratia liquefaciens. Heliotropin was identified by gas chromatography and gas chromatography-mass spectrometry analysis. In addition, the culture medium was optimized to improve heliotropin yield by experimental designs...
May 23, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28536292/capsule-production-and-glucose-metabolism-dictate-fitness-during-serratia-marcescens-bacteremia
#4
Mark T Anderson, Lindsay A Mitchell, Lili Zhao, Harry L T Mobley
Serratia marcescens is an opportunistic pathogen that causes a range of human infections, including bacteremia, keratitis, wound infections, and urinary tract infections. Compared to other members of the Enterobacteriaceae family, the genetic factors that facilitate Serratia proliferation within the mammalian host are less well defined. An in vivo screen of transposon insertion mutants identified 212 S. marcescens fitness genes that contribute to bacterial survival in a murine model of bloodstream infection...
May 23, 2017: MBio
https://www.readbyqxmd.com/read/28535612/efficient-whole-cell-biocatalyst-for-2-3-butanediol-acetoin-production-with-nadh-nad-regeneration-system-in-engineered-serratia-marcescens
#5
Rao Ben, Truong Ngoc Tu, Fan Ji Ying, Sun Jian An, Yaling Shen
Serratia marcescens is reported to possess the potential for industrial 2,3-butanediol or acetoin production by fermentation. But 2,3-butanediol or acetoin are always co-produced and this may make purification process difficult. So biocatalytic technologies may be the appropriate production methods. In this study, we developed an auto-inducing expression system based on pET system and swr quorum sensing system by using S. marcescens. By using this system, S. marcescens could be engineered as whole-cell biocatalyst to obtain 2,3-butanediol or acetoin...
May 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28533370/insect-pathogenic-fungus-interacts-with-the-gut-microbiota-to-accelerate-mosquito-mortality
#6
Ge Wei, Yiling Lai, Guandong Wang, Huan Chen, Fang Li, Sibao Wang
The insect gut microbiota plays crucial roles in modulating the interactions between the host and intestinal pathogens. Unlike viruses, bacteria, and parasites, which need to be ingested to cause disease, entomopathogenic fungi infect insects through the cuticle and proliferate in the hemolymph. However, interactions between the gut microbiota and entomopathogenic fungi are unknown. Here we show that the pathogenic fungus Beauveria bassiana interacts with the gut microbiota to accelerate mosquito death. After topical fungal infection, mosquitoes with gut microbiota die significantly faster than mosquitoes without microbiota...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28530397/synthesis-of-1-4-oxazepane-2-5-diones-via-cyclization-of-rotationally-restricted-amino-acid-precursors-and-structural-reassignment-of-serratin
#7
Ewout Ruysbergh, Kristof Van Hecke, Christian Victor Stevens, Norbert De Kimpe, Sven Mangelinckx
Several natural products containing a 1,4-oxazepane-2,5-dione-core are known. One example is serratin, isolated from Serratia marcescens. Due to the presence of a carboxylic amide, which has a preference for a trans-conformation, and the presence of a labile lactone in this core, many synthetic methodologies commonly used for the cyclization towards medium-sized heterocycles cannot be applied. As N-acyl amino acids without a third substituent at nitrogen failed to undergo ring-closure, several N-protecting groups were evaluated...
May 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28527888/tetrameric-structure-of-the-flagellar-cap-protein-flid-from-serratia-marcescens
#8
So Yeon Cho, Wan Seok Song, Ho Jeong Hong, Geun-Shik Lee, Seung Goo Kang, Hyun-Jeong Ko, Pyeung-Hyeun Kim, Sung-Il Yoon
Bacterial motility is provided by the flagellum. FliD is located at the distal end of the flagellum and plays a key role in the insertion of each flagellin protein at the growing tip of the flagellar filament. Because FliD functions as an oligomer, the determination of the oligomeric state of FliD is critical to understanding the molecular mechanism of FliD-mediated flagellar growth. FliD has been shown to adopt a pentameric or a hexameric structure depending on the bacterial species. Here, we report another distinct oligomeric form of FliD based on structural and biochemical studies...
May 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28525654/molecular-detection-by-analysis-of-the-16s-rrna-gene-of-fecal-coliform-bacteria-from-the-two-korean-apodemus-species-apodemus-agrarius-and-a-peninsulae
#9
M M Rahman, K B Yoon, S J Lim, M G Jeon, H J Kim, H Y Kim, J Y Cho, H M Chae, Y C Park
Wild mouse feces can disseminate zoonotic microorganisms throughout a farm, which is a great threat to human health and can lead to economic loss through contaminated agricultural produce. To assess the microbial communities, especially fecal coliform bacteria, we used two methods. First, we isolated bacterial colonies onto the common media LB (lactose broth) agar, TSA (tryptic soy agar), and MRS (de Man, Rogosa, and Sharpe) agar, and then randomly select colonies from each plate and stocked them to the mother plate for genomic DNA isolation...
May 18, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28522292/cross-talk-between-bacterial-two-component-systems-drives-stepwise-regulation-of-flagellar-biosynthesis-in-swarming-development
#10
Chia-Fong Wei, Yu-Huan Tsai, Sheng-Hui Tsai, Chuan-Sheng Lin, Chih-Jung Chang, Chia-Chen Lu, Hsiou-Chen Huang, Hsin-Chih Lai
Swarming motility is a mode of bacterial movement over a solid surface driven by rotating flagella in a coordinated manner. Bacteria can use two-component system (TCS), which typically comprises a sensor kinase and a specific cognate response regulator, to properly react to environmental changes. We previously showed that the TCS RssAB suppresses flagellar biosynthesis master regulator flhDC specifically in swarming lag phase to control surface migration timing without affecting expansion rate in Serratia marcescens swarming development...
May 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28512376/oscheius-microvilli-n-sp-nematoda-rhabditidae-a-facultatively-pathogenic-nematode-from-chongming-island-china
#11
Guixin Zhou, Huan Yang, Feng Wang, Haoran Bao, Guoxiang Wang, Xianglong Hou, Jian Lin, Gabriel Yedid, Keyun Zhang
A new species, Oscheius microvilli n. sp., was found on Chongming Island (Shanghai, China). The new species is morphologically similar to the type strain of Oscheius myriophilus, but can be distinguished from it and other species of Oscheius on the basis of unique morphological characteristics of the bursa as well as male papillae. In this new species, the male bursal papillar formula is 2, 1, 3, 3 with everted tips in the first, fifth, and seventh pairs. The bursal rim is jagged, joins together anterior to the spicules, and is partially extended and decorated with microvilli...
March 2017: Journal of Nematology
https://www.readbyqxmd.com/read/28505410/new-prodigiosin-derivatives-obtained-by-mutasynthesis-in-pseudomonas-putida
#12
Andreas S Klein, Andreas Domröse, Patrick Bongen, Hannah U C Brass, Thomas Classen, Anita Loeschcke, Thomas Drepper, Luca Laraia, Sonja Sievers, Karl-Erich Jaeger, Jörg Pietruszka
The deeply red-colored natural compound prodigiosin is a representative of the prodiginine alkaloid family, which possesses bioactivities as antimicrobial, antitumor, and antimalarial agents. Various bacteria including the opportunistic human pathogen Serratia marcescens and different members of the Streptomycetaceae and Pseudoalteromonadaceae produce prodiginines. In addition, these microbes generally accumulate many structurally related alkaloids making efficient prodiginine synthesis and purification difficult and expensive...
May 26, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28503376/toward-a-better-understanding-of-the-mechanisms-of-symbiosis-a-comprehensive-proteome-map-of-a-nascent-insect-symbiont
#13
François Renoz, Antoine Champagne, Hervé Degand, Anne-Marie Faber, Pierre Morsomme, Vincent Foray, Thierry Hance
Symbiotic bacteria are common in insects and can affect various aspects of their hosts' biology. Although the effects of insect symbionts have been clarified for various insect symbiosis models, due to the difficulty of cultivating them in vitro, there is still limited knowledge available on the molecular features that drive symbiosis. Serratia symbiotica is one of the most common symbionts found in aphids. The recent findings of free-living strains that are considered as nascent partners of aphids provide the opportunity to examine the molecular mechanisms that a symbiont can deploy at the early stages of the symbiosis (i...
2017: PeerJ
https://www.readbyqxmd.com/read/28495763/draft-genome-sequences-of-serratia-marcescens-strains-caprex-sy13-and-caprex-sy21-isolated-from-yams
#14
Joseph Honger, Rita E Monson, Alison Rawlinson, George P C Salmond
Serratia marcescens strains CAPREx SY13 and CAPREx SY21 were isolated from Ghanaian yams from a London market. The draft genomes suggest that the strains are similar, with genomes of 5,308,004 and 5,157,134 bp and 59.35 and 59.62 G+C%, respectively. The genes necessary for prodigiosin biosynthesis were present in both strains.
May 11, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28491819/optimization-of-prodigiosin-production-by-serratia-marcescens-using-crude-glycerol-and-enhancing-production-using-gamma-radiation
#15
Nora M Elkenawy, Aymen S Yassin, Hala N Elhifnawy, Magdy A Amin
Prodigiosin is a red pigment produced by Serratia marcescens. Prodigiosin is regarded as a promising drug owing to its reported characteristics of possessing anti-microbial, anti-cancer, and immunosuppressive activity. A factorial design was applied to generate a set of 32 experimental combinations to study the optimal conditions for pigment production using crude glycerol obtained from local biodiesel facility as carbon source for the growth of Serratia marcescens. The maximum production (870 unit/cell) was achieved at 22 °C, at pH 9 with the addition of 1% (w/v) peptone and 10(9) cell/ml inoculum size after 6 days of incubation...
March 2017: Biotechnology Reports
https://www.readbyqxmd.com/read/28488226/the-prevalence-of-antibiotic-resistant-bacteria-arb-in-waters-of-the-lower-ballona-creek-watershed-los-angeles-county-california
#16
Stephanie Kawecki, Gary Kuleck, John H Dorsey, Christopher Leary, Michelle Lum
Screening for the prevalence of antibiotic-resistant bacteria (ARB) was done at the Ballona Creek and Wetlands, an urban-impacted wetland system in Los Angeles, California. The goals were (1) to assess the overall prevalence of ARB, and (2) compare differences in ARB abundance and the types of antibiotic resistance (AR) among the following sample types: lagoon water from Del Rey Lagoon, urban runoff from Ballona Creek, and water from the Ballona Wetlands (tidal water flooding in from the adjacent estuary, and ebbing out from the salt marsh)...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28479992/pathogen-induced-maternal-effects-result-in-enhanced-immune-responsiveness-across-generations
#17
Rebeca B Rosengaus, Nicole Hays, Colette Biro, James Kemos, Muizz Zaman, Joseph Murray, Bruck Gezahegn, Wendy Smith
Parental investment theory postulates that adults can accurately perceive cues from their surroundings, anticipate the needs of future offspring based on those cues, and selectively allocate nongenetic resources to their progeny. Such context-dependent parental contributions can result in phenotypically variable offspring. Consistent with these predictions, we show that bacterially exposed Manduca sexta mothers oviposited significantly more variable embryos (as measured by mass, volume, hatching time, and hatching success) relative to naïve and control mothers...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28476987/phytochemical-constituents-of-fucoidan-padina-tetrastromatica-and-its-assisted-agnps-for-enhanced-antibacterial-activity
#18
S Rajeshkumar
Biological synthesis of nanomaterials is a growing innovative approach and it was broadly utilised in the field of nanotechnology and nanomedicine. This study illustrates that biosynthesis of silver nanoparticles (AgNPs) using fucoidan extracted from seaweed Padina tetrastromatica. The functional groups of extracted fucoidan were characterised by Fourier transform infrared spectroscopy (FTIR) and used to NPs synthesis. Synthesised AgNPs were characterised by ultraviolet-visible spectra, scanning electron microscope, energy dispersive X-ray, transmission electron microscope, selected area electron diffraction and FTIR...
April 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28473944/antimicrobial-efficacy-of-contact-lens-care-solutions-against-neutrophil-enhanced-bacterial-biofilms
#19
Jorge A Hinojosa, Naiya B Patel, Meifang Zhu, Danielle M Robertson
PURPOSE: Neutrophil-derived extracellular debris has been shown to accelerate bacterial biofilm formation on hydrogel and silicone hydrogel contact lens surfaces compared to lenses inoculated with bacteria alone. The purpose of this study was to evaluate the disinfection efficacy of four standard commercial contact lens cleaning regimens against neutrophil-enhanced bacterial biofilms formed on silicone hydrogel contact lenses. METHODS: Four reference strains were used: Pseudomonas aeruginosa, Serratia marcescens, Stenotrophomonas maltophilia, and Staphylococcus aureus...
April 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28470079/validity-of-somatic-cell-count-as-indicator-of-pathogen-specific-intramammary-infections
#20
Inge-Marié Petzer, Joanne Karzis, Edward F Donkin, Edward C Webb, Eric M C Etter
The objective of this study was to determine whether somatic cell count (SCC) was an effective test, with a sensitivity exceeding 85%, to determine species-specific bacterial infections. In addition, the relation between the SCC and various udder pathogen groups was investigated. SCC thresholds of greater than 200 000 cells/mL were used in quarter and greater than 150 000 cells/mL in composite milk samples. A retrospective study was conducted on a data set for 89 635 quarter and 345 467 composite cow milk samples...
April 13, 2017: Journal of the South African Veterinary Association
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