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Fatty acid synthase

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https://www.readbyqxmd.com/read/28213537/ketoacylsynthase-domains-of-a-pufa-synthase-in-thraustochytrium-can-effectively-function-as-stand-alone-enzymes-in-escherichia-coli
#1
Xi Xie, Dauenpen Meesapyodsuk, Xiao Qiu
Thraustochytrium sp. 26185 accumulates a high level of docosahexaenoic acid (DHA), a nutritionally important ω-3 very long chain unsaturated fatty acid (VLCPUFA) synthesized primarily by polyunsaturated fatty acid (PUFA) synthase, a Type I polyketide synthase-like mega-enzyme. The PUFA synthase in this species comprises three large subunits each with multiple catalytic domains. It was hypothesized that among these domains, ketoacylsynthase (KS) domains might be critical for catalyzing the condensation of specific unsaturated acyl-ACPs with malonyl-ACP, whereby retaining double bonds in an extended acyl chain...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28213091/convergence-of-hepcidin-deficiency-systemic-iron-overloading-heme-accumulation-and-rev-erb%C3%AE-%C3%AE-activation-in-aryl-hydrocarbon-receptor-elicited-hepatotoxicity
#2
Kelly A Fader, Rance Nault, Mathew P Kirby, Gena Markous, Jason Matthews, Timothy R Zacharewski
Persistent aryl hydrocarbon receptor (AhR) agonists elicit dose-dependent hepatic lipid accumulation, oxidative stress, inflammation, and fibrosis in mice. Iron (Fe) promotes AhR-mediated oxidative stress by catalyzing reactive oxygen species (ROS) production. To further characterize the role of Fe in AhR-mediated hepatotoxicity, male C57BL/6 mice were orally gavaged with sesame oil vehicle or 0.01-30μg/kg 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) every 4days for 28days. Duodenal epithelial and hepatic RNA-Seq data were integrated with hepatic AhR ChIP-Seq, capillary electrophoresis protein measurements, and clinical chemistry analyses...
February 14, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28212343/oxyresveratrol-supplementation-to-c57bl-6-mice-fed-with-a-high-fat-diet-ameliorates-obesity-associated-symptoms
#3
Hui Yuan Tan, Iris Mei Ying Tse, Edmund Tsze Shing Li, Mingfu Wang
Oxyresveratrol has been proven effective in inhibiting adipogenesis in a 3T3-L1 cell model. We investigated the preventive effect of oxyresveratrol supplementation on obesity development in high-fat diet-fed mice. Male C57bl/6 mice were randomly subjected to control (5% fat by weight, LF), high-fat (30% fat by weight, HF), and high-fat supplemented with 0.25% and 0.5% oxyresveratrol (OXY1 and OXY2, respectively) diet groups for eight weeks. Oxyresveratrol supplementation effectively alleviated obesity-associated symptoms such as insulin resistance, hyperglycemia, and hepatic steatosis in high-fat diet-fed mice...
February 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28211202/role-of-modular-polyketide-synthases-in-the-production-of-polyether-ladder-compounds-in-ciguatoxin-producing-gambierdiscus-polynesiensis-and-g-excentricus-dinophyceae
#4
Gurjeet S Kohli, Katrina Campbell, Uwe John, Kirsty F Smith, Santiago Fraga, Lesley L Rhodes, Shauna A Murray
Gambierdiscus, a benthic dinoflagellate, produces ciguatoxins that cause the human illness Ciguatera. Ciguatoxins are polyether ladder compounds that have a polyketide origin, indicating that polyketide synthases (PKS) are involved in their production. We sequenced transcriptomes of G. excentricus and G. polynesiensis and found 264 contigs encoding single domain ketoacyl synthases (KS; G. excentricus: 106, G. polynesiensis: 143) and ketoreductases (KR; G. excentricus: 7, G. polynesiensis: 8) with sequence similarity to type I PKSs, as reported in other dinoflagellates...
February 17, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28208802/the-effect-of-mitochondrial-supplements-on-mitochondrial-activity-in-children-with-autism-spectrum-disorder
#5
Leanna M Delhey, Ekim Nur Kilinc, Li Yin, John C Slattery, Marie L Tippett, Shannon Rose, Sirish C Bennuri, Stephen G Kahler, Shirish Damle, Agustin Legido, Michael J Goldenthal, Richard E Frye
Treatment for mitochondrial dysfunction is typically guided by expert opinion with a paucity of empirical evidence of the effect of treatment on mitochondrial activity. We examined citrate synthase and Complex I and IV activities using a validated buccal swab method in 127 children with autism spectrum disorder with and without mitochondrial disease, a portion of which were on common mitochondrial supplements. Mixed-model linear regression determined whether specific supplements altered the absolute mitochondrial activity as well as the relationship between the activities of mitochondrial components...
February 13, 2017: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/28204815/enzyme-treated-ecklonia-cava-extract-inhibits-adipogenesis-through-the-downregulation-of-c-ebp%C3%AE-in-3t3-l1-adipocytes
#6
In-Hye Kim, Taek-Jeong Nam
In this study, we examined the inhibitory effects of enzyme- treated Ecklonia cava (EEc) extract on the adipogenesis of 3T3-L1 adipocytes. The components of Ecklonia cava (E. cava) were first separated and purified using the digestive enzymes pectinase (Rapidase® X‑Press L) and cellulase (Rohament® CL). We found that the EEc extract contained three distinct phlorotannins: eckol, dieckol and phlorofucofuroeckol-A. Among the phlorotannins, dieckol was the most abundant in the EEc extract at 16 mg/g. Then we examined the inhibitory effects of EEc extract treatment on differentiation‑related transcription factors and on adipogenesis‑related gene expression in vitro using 3T3-L1 adipocytes...
January 26, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28202596/the-3-hydroxyacyl-acp-dehydratase-component-of-the-plant-mitochondrial-fatty-acid-synthase-system
#7
Xin Guan, Yozo Okazaki, Andrew Lithio, Ling Li, Xuefeng Zhao, Huanan Jin, Dan Nettleton, Kazuki Saito, Basil J Nikolau
We report the characterization of the Arabidopsis 3-hydroxyacyl-acyl carrier protein (ACP) dehydratase (mtHD) component of the mitochondrial fatty acid synthase (mtFAS) system, encoded by AT5G60335. The mitochondrial localization and catalytic capability of mtHD were demonstrated with a green fluorescent protein (GFP) transgenesis experiment, and by in vivo complementation and in vitro enzymatic assays. RNAi knockdown lines with reduced mtHD expression exhibit traits typically associated with mtFAS mutants, namely a miniaturized morphological appearance, reduced lipoylation of lipoylated proteins, and altered metabolomes consistent with the reduced catalytic activity of lipoylated enzymes...
February 15, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28202541/coordinate-regulation-of-yeast-sterol-regulatory-element-binding-protein-srebp-and-mga2-transcription-factors
#8
Risa Burr, Emerson V Stewart, Peter J Espenshade
The Mga2 and Sre1 transcription factors regulate oxygen-responsive lipid homeostasis in the fission yeast Schizosaccharomyces pombe in a manner analogous to the mammalian Sterol Regulatory Element-Binding Protein transcription factors SREBP-1 and SREBP-2. Mga2 and SREBP-1 regulate triacylglycerol and glycerophospholipid synthesis, while Sre1 and SREBP-2 regulate sterol synthesis. In mammals, a shared activation mechanism allows for coordinate regulation of SREBP-1 and SREBP-2. In contrast, distinct pathways activate fission yeast Mga2 and Sre1...
February 15, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28202364/fatty-acid-synthase-modern-tumor-cell-biology-insights-into-a-classical-oncology-target
#9
REVIEW
Douglas Buckley, Gregory Duke, Timothy S Heuer, Marie O'Farrell, Allan Wagman, William McCulloch, George Kemble
Decades of preclinical and natural history studies have highlighted the potential of fatty acid synthase (FASN) as a bona fide drug target for oncology. This review will highlight the foundational concepts upon which this perspective is built. Published studies have shown high levels of FASN in patient tumor tissues are present at later stages of disease and this overexpression predicts poor prognosis. Preclinical studies have shown that experimental overexpression of FASN in previously normal cells leads to changes that are critical for establishing a tumor phenotype...
February 12, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28197637/inhibition-of-fasn-suppresses-migration-invasion-and-growth-in-hepatoma-carcinoma-cells-by-deregulating-the-hif-1%C3%AE-igfbp1-pathway
#10
Jiaojiao Gong, Shasha Shen, Yixuan Yang, Si Qin, Lifan Huang, Hongmin Zhang, Ling Chen, Yaqin Chen, Shiying Li, Sha She, Min Yang, Hong Ren, Huaidong Hu
Hepatocellular carcinoma is the second most common cause of cancer-related deaths worldwide. Due to a high propensity to metastasize, active angiogenesis and rapid proliferation, recurrence and poor prognosis are major obstacles for treatment and cure of this disease. However, the detailed mechanisms of how fatty acid synthase (FASN) promotes migration, invasion and healing in tumor cells remain unclear. In the present study, the previous results that FASN was expressed higher in cancer samples than in non-cancerous samples, and influenced migration, invasion of hepatoma carcinoma cells, were verified by immunohistochemistry, tissue microarrays, Transwell assay and wound healing assay...
February 2, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28194557/-4z-15z-octadecadienoic-acid-inhibits-glycogen-synthase-kinase-3%C3%AE-and-glucose-production-in-h4iie-cells
#11
Jun Yoshida, Shota Uesugi, Tetsuaki Kawamura, Ken-Ichi Kimura, Dawei Hu, Shuang Xia, Naoki Toyooka, Masao Ohnishi, Hideki Kawashima
Many uncommon non-methylene-interrupted fatty acids (NMI FA) are present in limpet gonads, but their biological properties remain unknown. To investigate new biological effects of naturally occurring NMI FA in eukaryotic cells, the biological activities of structurally analogous (4Z,15Z)-octadecadienoic acid (1), (9Z,20Z)-tricosadienoic acid (2), and (12Z,23Z)-hexacosadienoic acid (3) were examined by using a yeast-based drug-screening system using the Ca(2+)-sensitive mutant strain, Saccharomyces cerevisiae (zds1Δ erg3Δ pdr1Δ pdr3Δ)...
February 13, 2017: Lipids
https://www.readbyqxmd.com/read/28194261/gelidium-amansii-extract-ameliorates-obesity-by-down-regulating-adipogenic-transcription-factors-in-diet-induced-obese-mice
#12
Ji-Hye Kang, Hyun-Ah Lee, Hak-Ju Kim, Ji-Sook Han
BACKGROUND/OBJECTIVES: In this study, we investigated whether Gelidium amansii extract (GAE) ameliorates obesity in diet-induced obese (DIO) mice. MATERIALS/METHODS: The mice were maintained on a high-fat diet (HD) for 5 weeks to generate the DIO mouse model. And then mice fed HD plus 0.5% (GAE1), 1% (GAE2) or 2% (GAE3) for 8 weeks. RESULTS: After the experimental period, GAE-supplemented groups were significantly lower than the HD group in body weight gain and liver weight...
February 2017: Nutrition Research and Practice
https://www.readbyqxmd.com/read/28193229/involvement-of-fatty-acid-synthase-in-dengue-virus-infection
#13
Natthida Tongluan, Suwipa Ramphan, Phitchayapak Wintachai, Janthima Jaresitthikunchai, Sarawut Khongwichit, Nitwara Wikan, Supoth Rajakam, Sutee Yoksan, Nuttaporn Wongsiriroj, Sittiruk Roytrakul, Duncan R Smith
BACKGROUND: The mosquito transmitted Dengue virus (DENV) remains a significant public health problem in many tropical and subtropical countries. Increasing evidence has suggested that during the infection process cellular lipids play important roles at several stages of the replication cycle. This study sought to characterize the changes in lipid metabolism gene expression and investigated the role of one enzyme, fatty acid synthase, in DENV infection. METHODS: Transcriptional profiles of genes associated with lipid metabolism were evaluated by real-time PCR after infection of different cell lines (HepG2 and HEK293T/17) and with different DENVs (laboratory adapted and low passage)...
February 13, 2017: Virology Journal
https://www.readbyqxmd.com/read/28190803/characterization-of-a-novel-rhamnose-containing-acidic-glycosphingolipid-from-the-ascidian-halocynthia-aurantium
#14
Hisao Kojima, Ryota Shinohara, Saki Itonori, Masahiro Ito
Halocynthia aurantium, an edible ascidian species belonging to Urochordata, was subjected to structural characterization of acidic glycosphingolipids to investigate these molecules in ascidians: sulfatide from Ciona intestinalis and the glucuronic acid-containing acidic glycosphingolipid from H. roretzi. Acidic glycosphingolipids containing three or five sugars were isolated from soft parts of the ascidian H. aurantium by chloroform-methanol extraction, mild-alkaline hydrolysis, precipitation with cold acetone, and subsequent column chromatography using a DEAE-Sephadex A-25 column, a Florisil column, and an Iatrobead column...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28190525/central-action-of-xenin-affects-the-expression-of-lipid-metabolism-related-genes-and-proteins-in-mouse-white-adipose-tissue
#15
Sharma Bhavya, Pei San Lew, Tooru M Mizuno
Xenin is a gastrointestinal hormone that reduces food intake when administered centrally and it has been hypothesized that central action of xenin participates in the regulation of whole-body metabolism. The present study was performed to address this hypothesis by investigating the central effect of xenin on the expression of genes and proteins that are involved in the regulation of lipid metabolism in white adipose tissue (WAT). Male obese ob/ob mice received intracerebroventricular (i.c.v.) injections of xenin (5μg) twice 12h apart...
February 9, 2017: Neuropeptides
https://www.readbyqxmd.com/read/28189115/n-3-polyunsaturated-fatty-acids-alleviate-high-glucose-mediated-dysfunction-of-endothelial-progenitor-cells-and-prevent-ischemic-injuries-both-in-vitro-and-in-vivo
#16
Shao-Chih Chiu, Che-Yi Chao, En-Pei Isabel Chiang, Jia-Ning Syu, Raymond L Rodriguez, Feng-Yao Tang
Hyperglycemia is associated with a reduced number of endothelial progenitor cells (EPCs) that impairs vascular function. Circulating EPCs play important roles in postnatal neovasculogenesis and the prevention of ischemic injury. Frequent consumption of fish oil (FO) that is abundant with eicosapentaenoic acid (EPA)/docosahexaenoic acid (DHA) is reportedly associated with an alleviation of diabetic complications and a lowered incidence of cardiovascular disease. The aim of this study was to examine whether N-3 polyunsaturated fatty acids such as EPA and DHA would reverse the high glucose-mediated dysfunction of EPCs in vitro and thereby prevent the ischemic injury that occurs under the hyperglycemic conditions in Type 2 diabetes (T2D) db(-/-) mice...
January 28, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28187530/structural-and-dynamic-characterization-of-a-freestanding-acyl-carrier-protein-involved-in-the-biosynthesis-of-cyclic-lipopeptide-antibiotics
#17
Subrata Paul, Hiroaki Ishida, Leonard T Nguyen, Zhihong Liu, Hans J Vogel
Friulimicin is a cyclic lipodecapeptide antibiotic that is produced by Actinoplanes friuliensis. Like the related lipopeptide drug daptomycin, the peptide skeleton of friulimicin is synthesized by a large multienzyme Nonribosomal Peptide Synthetase (NRPS) system. The LipD protein plays a major role in the acylation reaction of friulimicin. The attachment of the fatty acid group promotes its antibiotic activity. Phylogenetic analysis reveals that LipD is most closely related to other freestanding Acyl Carrier Proteins (ACPs), for which the genes are located near to NRPS gene clusters...
February 10, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28184213/loss-of-hepatic-ceacam1-a-unifying-mechanism-linking-insulin-resistance-to-obesity-and-non-alcoholic-fatty-liver-disease
#18
REVIEW
Garrett Heinrich, Hilda E Ghadieh, Simona S Ghanem, Harrison T Muturi, Khadijeh Rezaei, Qusai Y Al-Share, Thomas A Bowman, Deqiang Zhang, Robert S Garofalo, Lei Yin, Sonia M Najjar
The pathogenesis of human non-alcoholic fatty liver disease (NAFLD) remains unclear, in particular in the context of its relationship to insulin resistance and visceral obesity. Work on the carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) in mice has resolved some of the related questions. CEACAM1 promotes insulin clearance by enhancing the rate of uptake of the insulin-receptor complex. It also mediates a negative acute effect of insulin on fatty acid synthase activity. This positions CEACAM1 to coordinate the regulation of insulin and lipid metabolism...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28183167/detection-of-superior-genotype-of-fatty-acid-synthase-fasn-in-korean-native-cattle-by-an-environment-adjusted-statistical-model
#19
Jeayoung Lee, Dongyep Oh, Hyunji Kim, Gabsue Jang, Seunguk Lee
Objective: This study examines the genetic factors influencing the phenotypes (four economic traits: oleic acid (C18:1), monounsaturated fatty acids (MUFAs), carcass weight (CWT), and marbling score (MS)) of Hanwoo. Methods: To enhance the accuracy of the genetic analysis, the study proposes a new statistical model that excludes environmental factors. A statistically adjusted, analysis of covariance (ANCOVA) model of environmental and genetic factors was developed, and estimated environmental effects (covariate effects of age and effects of calving farms) were excluded from the model...
February 1, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28180141/identification-of-diagnostic-markers-involved-in-the-pathogenesis-of-gastric-cancer-through-itraq-based-quantitative-proteomics
#20
Zhen Jiang, Hongchun Shen, Bo Tang, Hui Chen, Qin Yu, Xingli Ji, Li Wang
We provide detailed datasets from our analysis of proteins that are differentially expressed in gastric cancer tissues compared with adjacent normal gastric tissues, as identified by iTRAQ-based quantitative proteomics. Also included is a set of representative images of immunohistochemical staining of gastric cancer tissues showing four levels of expression of fatty acid binding protein (FABP1) and fatty acid synthase (FASN). The data presented in this paper support the research article "Quantitative proteomic analysis reveals that proteins required for fatty acid metabolism may serve as diagnostic markers for gastric cancer" (Jiang et al...
April 2017: Data in Brief
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