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Bacterial fatty acids

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https://www.readbyqxmd.com/read/28448543/heterologous-expression-of-a-thermophilic-diacylglycerol-acyltransferase-triggers-triglyceride-accumulation-in-escherichia-coli
#1
Beatriz Lázaro, Juan A Villa, Omar Santín, Matilde Cabezas, Cintia D F Milagre, Fernando de la Cruz, Gabriel Moncalián
Triglycerides (TAGs), the major storage molecules of metabolic energy and source of fatty acids, are produced as single cell oil by some oleogenic microorganisms. However, these microorganisms require strict culture conditions, show low carbon source flexibilities, lack efficient genetic modification tools and in some cases pose safety concerns. TAGs have essential applications such as behaving as a source for added-value fatty acids or giving rise to the production of biodiesel. Hence, new alternative methods are urgently required for obtaining these oils...
2017: PloS One
https://www.readbyqxmd.com/read/28446905/okara-a-nutritionally-valuable-by-product-able-to-stabilize-lactobacillus-plantarum-during-freeze-drying-spray-drying-and-storage
#2
Gabriel Quintana, Esteban Gerbino, Andrea Gómez-Zavaglia
Okara is a nutritionally valuable by-product produced in large quantities as result of soymilk elaboration. This work proposes its use as both culture and dehydration medium during freeze-drying, spray-drying, and storage of Lactobacillus plantarum CIDCA 83114. Whole and defatted okara were employed as culture media for L. plantarum CIDCA 83114. The growth kinetics were followed by plate counting and compared with those of bacteria grown in MRS broth (control). No significant differences in plate counting were observed in the three media...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28443847/the-impact-of-dietary-sn-2-palmitic-triacylglycerols-in-combination-with-docosahexaenoic-acid-or-arachidonic-acid-on-lipid-metabolism-and-host-faecal-microbiota-composition-in-sprague-dawley-rats
#3
Jianchun Wan, Songyou Hu, Jörg J Jacoby, Jie Liu, Yaqiong Zhang, Liangli Lucy Yu
Sn-2 palmitic acid triacylglycerols (sn2PA fat) and polyunsaturated fatty acids are thought to influence the metabolic status and intestinal bacterial population of the host. In this study, the impact of sn2PA fat in combination with DHA or ARA in the diet on lipid metabolism in the liver and faecal microbiota composition were investigated in rats fed diets containing sn2PA fat, 90% sn2PA fat + 10% DHA oil (wt%), or 90% sn2PA fat + 10% ARA oil (wt%). Tissue fatty acid composition was measured using gas chromatography (GC), whereas the faecal microbial composition was assessed using 16S rRNA high-throughput sequencing technology...
April 26, 2017: Food & Function
https://www.readbyqxmd.com/read/28441964/fecal-metagenomic-profiles-in-subgroups-of-patients-with-myalgic-encephalomyelitis-chronic-fatigue-syndrome
#4
Dorottya Nagy-Szakal, Brent L Williams, Nischay Mishra, Xiaoyu Che, Bohyun Lee, Lucinda Bateman, Nancy G Klimas, Anthony L Komaroff, Susan Levine, Jose G Montoya, Daniel L Peterson, Devi Ramanan, Komal Jain, Meredith L Eddy, Mady Hornig, W Ian Lipkin
BACKGROUND: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is characterized by unexplained persistent fatigue, commonly accompanied by cognitive dysfunction, sleeping disturbances, orthostatic intolerance, fever, lymphadenopathy, and irritable bowel syndrome (IBS). The extent to which the gastrointestinal microbiome and peripheral inflammation are associated with ME/CFS remains unclear. We pursued rigorous clinical characterization, fecal bacterial metagenomics, and plasma immune molecule analyses in 50 ME/CFS patients and 50 healthy controls frequency-matched for age, sex, race/ethnicity, geographic site, and season of sampling...
April 26, 2017: Microbiome
https://www.readbyqxmd.com/read/28437712/raspberry-pomace-alters-cecal-microbial-activity-and-reduces-secondary-bile-acids-in-rats-fed-a-high-fat-diet
#5
Bartosz Fotschki, Jerzy Juśkiewicz, Adam Jurgoński, Neil Rigby, Michał Sójka, Krzysztof Kołodziejczyk, Alan Mackie, Zenon Zduńczyk
The profile of bile acids (BA) largely depends on the enzymatic activity of the microbiota, but this can be modulated by the dietary addition of biologically active compounds, e.g., polyphenols and polyunsaturated fatty acids. The aim of this study was to examine the effect of dietary raspberry pomace as a rich source of biologically active compounds on microbial activity and the BA profile in the caecum of rats fed a high-fat diet. Wistar rats were fed the standard diet AIN-93, a high-fat diet or a modified high-fat diet enriched with 7% different types of processed raspberry pomaces produced by standard grinding and fine grinding, with or without seeds...
April 7, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28436589/short-chain-fatty-acids-augment-rat-duodenal-mucosal-barrier-function
#6
Wan Salman Wan Saudi, Markus Sjöblom
Short-chain fatty acids (SCFAs) are produced by bacterial fermentation in the large intestine, particularly from diets containing fibres and carbohydrates. The small intestinal epithelium is exposed to SCFAs derived mainly from oral bacteria or food supplementation. Although luminal nutrients are important in regulation of intestinal functions the role of SCFAs in regulation of small intestinal mucosal barrier function and motility has not been fully described. The aim of the present study was to elucidate the effects of acetate and propionate on duodenal mucosal barrier function and motility...
April 24, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28434178/massilia-chloroacetimidivorans-sp-nov-a-chloroacetamide-herbicide-degrading-bacterium-isolated-from-soil
#7
Hyosun Lee, Dong-Uk Kim, Sooyeon Park, Jung-Hoon Yoon, Jong-Ok Ka
A Gram-stain negative, rod-shaped, aerobic bacterial strain, designated TA-C7e(T), was isolated from an agricultural soil obtained from Taean region, Korea. Phylogenetically, the strain was grouped with the genus Massilia and shared 95.33-97.97% 16S rRNA sequence similarity with the type strains of other species of the genus Massilia. The DNA-DNA hybridisation between TA-C7e(T) and Massilia haematophila KACC 13771(T), Massilia suwonesis KACC 12635(T), and Massilia yuzhufengensis KACC 16569(T) revealed a low level of relatedness (<40%)...
April 22, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28432098/inhibitory-effect-of-coumarin-on-syntrophic-fatty-acid-oxidizing-and-methanogenic-cultures-and-biogas-reactor-microbiomes
#8
Denny Popp, Caroline M Plugge, Sabine Kleinsteuber, Hauke Harms, Heike Sträuber
Coumarins are widely found in plants as natural constituents having antimicrobial activity. When considering plants rich in coumarins for biogas production, adverse effects on microorganisms driving the anaerobic digestion process are expected. Furthermore, coumarin derivatives like warfarin, which are used as anti-coagulating medicine, are found in wastewater affecting its treatment. Coumarin as the structure common to all coumarins inhibits the anaerobic digestion process. However, details of this inhibition are still elusive...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28429671/ethanolamine-metabolism-in-the-mammalian-gastrointestinal-tract-mechanisms-patterns-and-importance
#9
J Zhou, X Xiong, K Wang, L Zou, D Lv, Y Yin
Nutritional exchanges and cooperation between bacteria in the gastrointestinal tract and the mammalian host play an important role in health and disease. Ethanolamine is an essential dietary lipid nutrient for animals and is abundant in both intestinal and bacterial cell membranes. Ethanolamine can be utilized by intestinal eukaryotic cells via the cytidine phosphoethanolamine pathway for de novo synthesis of phosphatidylethanolamine, and certain bacteria are able to catabolize it as a major carbon and/or nitrogen source with the help of ethanolamine utilization proteins...
March 31, 2017: Current Molecular Medicine
https://www.readbyqxmd.com/read/28429489/transcriptional-analysis-of-the-adaptation-of-ustilago-maydis-during-growth-under-nitrogen-fixation-conditions
#10
José Alejandro Sánchez-Arreguin, Miguel Angel Hernandez-Oñate, Claudia Geraldine León-Ramirez, José Ruiz-Herrera
Regulation of genes involved in nitrogen metabolism likely plays a role in the ability of fungi to exploit and survive under different environmental situations. To learn about the mechanism of adaptation of the biotrophic fungus Ustilago maydis from a medium containing a source of fixed nitrogen, to a medium depending on the ability to fix N2 by its bacterial endosymbiont, we explored gene expression profiles using RNA-Seq analyses under these two conditions. The differentially expressed (DE) fungal genes were analyzed, identifying 90 genes that were regulated 24 h after shifting the fungus to media lacking ammonium nitrate as a nitrogen source...
April 21, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28429169/nocardioides-suum-sp-nov-isolated-from-the-air-environment-in-an-indoor-pig-farm
#11
Siwon Lee, Wonseok Lee, Hyen-Mi Chung, Sangjung Park
A bacterial strain PBT33-2(T) was isolated from the air environment in an indoor pig farm. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain PBT33-2(T) belonged to the genus Nocardioides in the phylum Actinobacteria, and was most closely related to Nocardioides daphnia D287(T) in a maximum-likelihood and neighbor-joining phylogenetic trees. Strain PBT33-2(T) shared 95.3% sequence identity with N. daphnia D287(T). However, the highest sequence similarity was shown with N. sediminis MSL-01(T) (96...
April 20, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28426766/activated-entomopathogenic-nematode-infective-juveniles-release-lethal-venom-proteins
#12
Dihong Lu, Marissa Macchietto, Dennis Chang, Mirayana M Barros, James Baldwin, Ali Mortazavi, Adler R Dillman
Entomopathogenic nematodes (EPNs) are unique parasites due to their symbiosis with entomopathogenic bacteria and their ability to kill insect hosts quickly after infection. It is widely believed that EPNs rely on their bacterial partners for killing hosts. Here we disproved this theory by demonstrating that the in vitro activated infective juveniles (IJs) of Steinernema carpocapsae (a well-studied EPN species) release venom proteins that are lethal to several insects including Drosophila melanogaster. We confirmed that the in vitro activation is a good approximation of the in vivo process by comparing the transcriptomes of individual in vitro and in vivo activated IJs...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28423879/effects-of-various-weaning-times-on-growth-performance-rumen-fermentation-and-microbial-population-of-yellow-cattle-calves
#13
Huiling Mao, Yuefeng Xia, Yan Tu, Chong Wang, Qiyu Diao
Objective: This study was conducted to investigate the effects of weaning times on the growth performance, rumen fermentation and microbial communities of yellow cattle calves. Methods: Eighteen calves were assigned to a conventional management group that was normally weaned (NW, n = 3) or to early weaned (EW) group where calves were weaned when the feed intake of solid feed (starter) reached 500 g (EW500, n = 5), 750 g (EW750, n = 5), or 1000 g (EW1000, n = 5)...
March 25, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28422148/chemical-and-bioactive-profiling-and-biological-activities-of-coral-fungi-from-northwestern-himalayas
#14
Sapan Kumar Sharma, Nandini Gautam
Ramaria Fr. and Clavaria L. are the two major genera of coral mushrooms within families Gomphaceae and Clavariaceae, respectively. Besides having important role in forest ecology, some species of these are reported to possess high nutraceutical and bioactive potential. There is a hidden diversity of coral mushrooms in Northwestern Himalayas. Present studies describe the detailed biochemical profiling and antioxidant, and antibacterial activities of twelve coral mushroom species. Biochemical profiling of nutrients and nutraceuticals was done with standard techniques and by using HPLC, UPLC and GC...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28421524/distance-dependent-varieties-of-microbial-community-structure-and-metabolic-functions-in-the-rhizosphere-of-sedum-alfredii-hance-during-phytoextraction-of-a-cadmium-contaminated-soil
#15
Wenhao Yang, Taoxiang Zhang, Sen Lin, Wuzhong Ni
The recovery of microbial community and activities is crucial to the remediation of contaminated soils. Distance-dependent variations of microbial community composition and metabolic characteristics in the rhizospheric soil of hyperaccumulator during phytoextraction are poorly understood. A 12-month phytoextraction experiment with Sedum alfredii in a Cd-contaminated soil was conducted. A pre-stratified rhizobox was used for separating sub-layer rhizospheric (0-2, 2-4, 4-6, 6-8, 8-10 mm from the root mat)/bulk soils...
April 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28420790/honeybee-gut-microbiota-promotes-host-weight-gain-via-bacterial-metabolism-and-hormonal-signaling
#16
Hao Zheng, J Elijah Powell, Margaret I Steele, Carsten Dietrich, Nancy A Moran
Social bees harbor a simple and specialized microbiota that is spatially organized into different gut compartments. Recent results on the potential involvement of bee gut communities in pathogen protection and nutritional function have drawn attention to the impact of the microbiota on bee health. However, the contributions of gut microbiota to host physiology have yet to be investigated. Here we show that the gut microbiota promotes weight gain of both whole body and the gut in individual honey bees. This effect is likely mediated by changes in host vitellogenin, insulin signaling, and gustatory response...
April 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28419122/lauric-acid-as-feed-additive-an-approach-to-reducing-campylobacter-spp-in-broiler-meat
#17
Katrin Zeiger, Johanna Popp, André Becker, Julia Hankel, Christian Visscher, Guenter Klein, Diana Meemken
The increasing prevalence of Campylobacter spp. within broiler populations is a major problem for food safety and consumer protection worldwide. In vitro studies could already demonstrate that Campylobacter spp. are susceptible to lauric acid. The purpose of this study was to examine in vivo the influence of lauric acid as a feed additive on slaughter parameters, muscle fatty acid profile, meat quality traits and the reduction of Campylobacter coli in inoculated meat of Ross 308 (R308) and Hubbard JA 757 (HJA) broilers in three independent trials (n = 3)...
2017: PloS One
https://www.readbyqxmd.com/read/28417190/larkinella-harenae-sp-nov-isolated-from-korean-beach-soil
#18
Su-Jin Park, Jae-Jin Lee, Seung-Yeol Lee, Dae Sung Lee, Myung Kyum Kim, Leonid N Ten, Hee-Young Jung
A Gram-negative, short rod-shaped, gliding motile, and pale pink-pigmented bacterial strain, designated 15J9-9(T), was isolated from the soil of Iho Tewoo Beach, Jeju Island, Korea, and characterized taxonomically using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strain 15J9-9(T) belonged to the family Cytophagaceae and was related to Larkinella bovis M2T2B15(T) (96.5% similarity), Larkinella arboricola Z0532(T) (95.3% similarity), and Larkinella insperata LMG 22510(T) (95...
April 17, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28416212/conversion-of-vegetable-wastes-to-organic-acids-in-leaching-bed-reactor-performance-and-bacterial-community-analysis
#19
Yan Li, Dongliang Hua, Hui Mu, Haipeng Xu, Fuqiang Jin, Xiaodong Zhang
Vegetable wastes (VWs), which contained abundant solid content, were digested in a leaching bed reactor (LBR). The tested VWs for acidification in the LBR included cabbage, potato, and tomato vine. The digestion in the LBR was carried out at the same organic loading rate of 25 g volatile solid (VS) per liter. It was found that cabbage and potato produced much more volatile fatty acids (VFAs) than tomato vine, probably because readily degradable components were more abundant in cabbage and potato. The retention time to digest each feedstock was different...
April 14, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28415978/bacterial-communities-and-metabolic-activity-of-faecal-cultures-from-equol-producer-and-non-producer-menopausal-women-under-treatment-with-soy-isoflavones
#20
Lucía Guadamuro, Anja B Dohrmann, Christoph C Tebbe, Baltasar Mayo, Susana Delgado
BACKGROUND: Isoflavones are polyphenols with estrogenic activity found mainly in soy and soy-derived products that need to be metabolised in the intestine by the gut bacteria to be fully active. There is little knowledge about isoflavone bioconversion and equol production in the human intestine. In this work, we developed an in vitro anaerobic culture model based on faecal slurries to assess the impact of isoflavone supplementation on the overall intestinal bacterial composition changes and associated metabolic transformations...
April 17, 2017: BMC Microbiology
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