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Fatty acid synthesis

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https://www.readbyqxmd.com/read/28727189/inversion-of-cpadh5-enantiopreference-and-altered-chain-length-specificity-for-methyl-3-hydroxyalkanoates
#1
Yunus Ensari, Gaurao V Dhoke, Mehdi D Davari, Marco Bocola, Anna Joelle Ruff, Ulrich Schwaneberg
Expanding the substrate scope of enzymes opens up new routes for synthesis of valuable chemicals. Ketone-functionalized fatty acid derivatives and corresponding chiral alcohols are valuable building blocks for the synthesis of a variety of chemicals including pharmaceuticals. The alcohol dehydrogenase from Candida parapsilosis (cpADH5) catalyzes the reversible oxidations of chiral alcohols and has a broad substrate range; a challenge for cpADH5 is to convert alcohols with small substituents (methyl or ethyl) next to the oxidized alcohol moiety...
July 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28727003/triennial-growth-and-development-symposium-intramuscular-fat-deposition-in-ruminants-and-pigs-a-transcriptomics-perspective
#2
B P Dalrymple, B Guo
The genomics era has led to an explosion in the study of gene expression in production animals. Intramuscular fat (IMF) content (both high and low) and composition are major quality attributes of meat, and more than 90 transcriptomic studies of IMF deposition have been undertaken in the ruminants and pigs since 2001, with the majority since 2008. The studies have implicated many genes involved in the control of adipogenesis, lipogenesis, and deposition of IMF, but there is relatively little consistency between the different studies...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28726934/clove-extract-functions-as-a-natural-fatty-acid-synthesis-inhibitor-and-prevents-obesity-in-a-mouse-model
#3
Yiran Ding, Zhennan Gu, Yihe Wang, Shunhe Wang, Haiqin Chen, Hao Zhang, Wei Chen, Yong Q Chen
Numerous medicinal plants have been reported to prevent various chronic diseases. In this study, we screened a new FASN inhibitor-alcohol extract of clove (AEC) using a fast microplate method developed in our laboratory. The major components of AEC were: eugenol (42.27%), acetyl eugenol (29.12%), caryophyllene (15.40%), and humulene (3.22%). Fatty acid synthase (FASN) is a key enzyme for de novo lipogenesis, and it has been suggested as a potential therapeutic target in cancer and obesity. We have tested the ability of AEC to inhibit FASN in mammalian cells and tissues...
July 20, 2017: Food & Function
https://www.readbyqxmd.com/read/28726631/lipid-transfer-from-plants-to-arbuscular-mycorrhiza-fungi
#4
Andreas Keymer, Priya Pimprikar, Vera Wewer, Claudia Huber, Mathias Brands, Simone L Bucerius, Pierre-Marc Delaux, Verena Klingl, Edda von Röpenack-Lahaye, Trevor L Wang, Wolfgang Eisenreich, Peter Dörmann, Martin Parniske, Caroline Gutjahr
Arbuscular mycorrhiza (AM) symbioses contribute to global carbon cycles as plant hosts divert up to 20% of photosynthate to the obligate biotrophic fungi. Previous studies suggested carbohydrates as the only form of carbon transferred to the fungi. However, de novo fatty acid (FA) synthesis has not been observed in AM fungi in absence of the plant. In a forward genetic approach, we identified two Lotus japonicus mutants defective in AM-specific paralogs of lipid biosynthesis genes (KASI and GPAT6). These mutants perturb fungal development and accumulation of emblematic fungal 16:1ω5 FAs...
July 20, 2017: ELife
https://www.readbyqxmd.com/read/28725902/impact-of-grape-pomace-consumption-on-the-blood-lipid-profile-and-liver-genes-associated-with-lipid-metabolism-of-young-rats
#5
Jianmei Yu, Rishipal R Bansode, Ivy N Smith, Steven L Hurley
Herein, we investigated the effects of grape pomace (GP) in diet on body weight, blood lipid profile, and expression of liver genes associated with lipid metabolism using a young rat model. In this study, twenty female Sprague-Dawley rats at 7 weeks of age were randomly divided into 4 groups, which were fed modified AIN-93G diets containing 0% (control), 6.9%, 13.8%, and 20.7% of GP for 10 weeks. Feed consumption and body weight were weekly determined. Blood samples were obtained at the beginning and end of the feeding period for cholesterol, alanine aminotransferase (ALT), and glucose analysis...
July 20, 2017: Food & Function
https://www.readbyqxmd.com/read/28725557/genome-assembly-of-chryseobacterium-sp-strain-ihbb-10212-from-glacier-top-surface-soil-in-the-indian-trans-himalayas-with-potential-for-hydrolytic-enzymes
#6
Mohinder Pal, Mohit Kumar Swarnkar, Hena Dhar, Sanjay Chhibber, Arvind Gulati
The cold-active esterases are gaining importance due to their catalytic activities finding applications in chemical industry, food processes and detergent industry as additives, and organic synthesis of unstable compounds as catalysts. In the present study, the complete genome sequence of 4,843,645 bp with an average 34.08% G + C content and 4260 protein-coding genes are reported for the low temperature-active esterase-producing novel strain of Chrysobacterium isolated from the top-surface soil of a glacier in the cold deserts of the Indian trans-Himalayas...
September 2017: Genomics Data
https://www.readbyqxmd.com/read/28724938/a-novel-role-for-rar%C3%AE-agonists-as-apolipoprotein-ciii-inhibitors-identified-from-high-throughput-screening
#7
Sang Jun Lee, Madhupriya Mahankali, Abdallah Bitar, Huafei Zou, Elizabeth Chao, Hung Nguyen, Jose Gonzalez, Dawna Caballero, Mitch Hull, Danling Wang, Peter G Schultz, Weijun Shen
Elevated triglyceride (TG) levels are well-correlated with the risk for cardiovascular disease (CVD). Apolipoprotein CIII (ApoC-III) is a key regulator of plasma TG levels through regulation of lipolysis and lipid synthesis. To identify novel regulators of TG levels, we carried out a high throughput screen (HTS) using an ApoC-III homogenous time resolved fluorescence (HTRF) assay. We identified several retinoic acid receptor (RAR) agonists that reduced secreted ApoC-III levels in human hepatic cell lines. The RARα specific agonist AM580 inhibited secreted ApoC-III by >80% in Hep3B cells with an EC50 ~2...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724430/egfr-modulates-monounsaturated-fatty-acid-synthesis-through-phosphorylation-of-scd1-in-lung-cancer
#8
Jiqin Zhang, Fei Song, Xiaojing Zhao, Hua Jiang, Xiuqi Wu, Biao Wang, Min Zhou, Mi Tian, Bizhi Shi, Huamao Wang, Yuanhui Jia, Hai Wang, Xiaorong Pan, Zonghai Li
BACKGROUND: Epidermal growth factor receptor (EGFR), a well-known oncogenic driver, contributes to the initiation and progression of a wide range of cancer types. Aberrant lipid metabolism including highly produced monounsaturated fatty acids (MUFA) is recognized as a hallmark of cancer. However, how EGFR regulates MUFA synthesis in cancer remains elusive. This is the focus of our study. METHODS: The interaction between EGFR and stearoyl-CoA desaturase-1 (SCD1) was detected byco-immunoprecipitation...
July 19, 2017: Molecular Cancer
https://www.readbyqxmd.com/read/28724407/characterization-of-the-cytochrome-p450-monooxygenase-genes-p450ome-from-the-carotenogenic-yeast-xanthophyllomyces-dendrorhous
#9
Pamela Córdova, Ana-María Gonzalez, David R Nelson, María-Soledad Gutiérrez, Marcelo Baeza, Víctor Cifuentes, Jennifer Alcaíno
BACKGROUND: The cytochromes P450 (P450s) are a large superfamily of heme-containing monooxygenases involved in the oxidative metabolism of an enormous diversity of substrates. These enzymes require electrons for their activity, and the electrons are supplied by NAD(P)H through a P450 electron donor system, which is generally a cytochrome P450 reductase (CPR). The yeast Xanthophyllomyces dendrorhous has evolved an exclusive P450-CPR system that specializes in the synthesis of astaxanthin, a carotenoid with commercial potential...
July 19, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28722145/dendrobium-nobile-lindl-alkaloids-regulate-metabolism-gene-expression-in-livers-of-mice
#10
Yun-Yan Xu, Ya-Sha Xu, Yuan Wang, Qin Wu, Yuan-Fu Lu, Jie Liu, Jing-Shan Shi
OBJECTIVES: In our previous studies, Dendrobium nobile Lindl. alkaloids (DNLA) has been shown to have glucose-lowering and antihyperlipidaemia effects in diabetic rats, in rats fed with high-fat diets, and in mice challenged with adrenaline. This study aimed to examine the effects of DNLA on the expression of glucose and lipid metabolism genes in livers of mice. METHODS: Mice were given DNLA at doses of 10-80 mg/kg, po for 8 days, and livers were removed for total RNA and protein isolation to perform real-time RT-PCR and Western blot analysis...
July 19, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28721723/enrichment-of-long-chain-polyunsaturated-fatty-acids-by-coordinated-expression-of-multiple-metabolic-nodes-in-the-oleaginous-microalga-phaeodactylum-tricornutum
#11
Xiang Wang, Yu-Hong Liu, Wei Wei, Xia Zhou, Wasiqi Yuan, Srinivasan Balamurugan, Ting-Bin Hao, Wei-Dong Yang, Jie-Sheng Liu, Hong-Ye Li
Microalgal long-chain polyunsaturated fatty acids (LC-PUFAs) have emerged as promising alternatives to depleting fish oils. However, the overproduction of LC-PUFAs in microalgae has remained challenging. Here, we report a sequential metabolic engineering strategy that systematically overcomes the metabolic bottlenecks and overproduces LC-PUFAs. Malonyl CoA-acyl carrier protein transacylase, catalyzing the first committed step in type II fatty acid synthesis, and desaturase 5b, involved in fatty acid desaturation, were coordinately expressed in Phaeodactylum tricornutum...
July 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28720584/protein-kinase-n2-regulates-amp-kinase-signaling-and-insulin-responsiveness-of-glucose-metabolism-in-skeletal-muscle
#12
Maxwell A Ruby, Isabelle Riedl, Julie Massart, Marcus Åhlin, Juleen R Zierath
Insulin resistance is central to the development of type 2 diabetes and related metabolic disorders. As skeletal muscle is responsible for the majority of whole body insulin-stimulated glucose uptake, regulation of glucose metabolism in this tissue is of particular importance. While Rho GTPases and many of their affecters influence skeletal muscle metabolism, there is a paucity of information on the protein kinase N (PKN) family of serine/threonine protein kinases. We investigated the impact of PKN2 on insulin signaling and glucose metabolism in primary human skeletal muscle cells in vitro and mouse tibialis anterior muscle in vivo...
July 18, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28717254/the-molecular-mechanisms-of-monascus-purpureus-m9-responses-to-blue-light-based-on-the-transcriptome-analysis
#13
Di Chen, Mianhua Chen, Shufen Wu, Zhenjing Li, Hua Yang, Changlu Wang
Light is an important environmental factor that regulates various physiological processes of fungi. To thoroughly study the responses of Monascus to blue light, transcriptome sequencing was performed on mRNAs isolated from samples of Monascus purpureus M9 cultured under three conditions: darkness (D); exposure to blue light for 15 min/d (B15); and exposure to blue light for 60 min/d over 8 days (B60). The number of differentially expressed genes between the three pairs of samples-B15 vs D, B60 vs B15, and B60 vs D-was 1167, 1172, and 220, respectively...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717017/modulation-of-lipid-biosynthesis-by-stress-in-diatoms
#14
REVIEW
Olga Sayanova, Virginie Mimouni, Lionel Ulmann, Annick Morant-Manceau, Virginie Pasquet, Benoît Schoefs, Johnathan A Napier
Diatoms are responsible for up to 40% of the carbon fixation in our oceans. The fixed carbon is moved through carbon metabolism towards the synthesis of organic molecules that are consumed through interlocking foodwebs, and this process is strongly impacted by the abiotic environment. However, it has become evident that diatoms can be used as 'platform' organisms for the production of high valuable bio-products such as lipids, pigments and carbohydrates where stress conditions can be used to direct carbon metabolism towards the commercial production of these compounds...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28711161/role-of-fatty-acids-in-cold-adaptation-of-antarctic-psychrophilic-flavobacterium-spp
#15
Stanislava Králová
Cold-loving microorganisms developed numerous adaptation mechanisms allowing them to survive in extremely cold habitats, such as adaptation of the cell membrane. The focus of this study was on the membrane fatty acids of Antarctic Flavobacterium spp., and their adaptation response to cold-stress. Fatty acids and cold-response of Antarctic flavobacteria was also compared to mesophilic and thermophilic members of the genus Flavobacterium. The results showed that the psychrophiles produced more types of major fatty acids than meso- and thermophilic members of this genus, namely C15:1 iso G, C15:0 iso, C15:0 anteiso, C15:1ω6c, C15:0 iso 3OH, C17:1ω6c, C16:0 iso 3OH and C17:0 iso 3OH, summed features 3 (C16:1ω7cand/or C16:1ω6c) and 9 (C16:0 10-methyl and/or C17:1 iso ω9c)...
July 3, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28710671/functional-characterization-of-hormone-sensitive-like-lipase-from-bacillus-halodurans-synthesis-and-recovery-of-pnp-laurate-with-high-yields
#16
Ashima Dua, Rani Gupta
The HSL-like lipase encoding gene (Blip) from the polyextremophile Bacillus halodurans C-125 has been heterologously expressed in E.coli BL21(DE3). The enzyme is a monomer of ~42 kDa. It has extremely high thermal stability with a t 1/2 of 35 min at 100 °C. Thermal denaturation/renaturation studies by CD and fluorescence analysis revealed complete refolding of the protein back to its native conformation even after 30 min at 90 °C. Blip prefers substrates with mid to long chain fatty acids. It has a higher catalytic efficiency on para-nitrophenyl fatty acyl esters as opposed to triacylglycerides (k cat/K m with pNP-palmitate as a substrate was 2...
July 14, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28707470/enhancement-of-naringenin-biosynthesis-from-tyrosine-by-metabolic-engineering-of-saccharomyces-cerevisiae
#17
Xiaomei Lyu, Kuan Rei Ng, Jie Lin Lee, Rita Mark, Wei Ning Chen
Flavonoids are a class of plant polyphenols that possess a variety of essential health properties. In this work, the capacity of microbial naringenin synthesis from tyrosine in S. cerevisiae was explored and optimized through metabolic engineering on precursor supply and promoter control within three modules. Specifically, in Module 1, a modified GAL system was employed for pathway construction and the synergistic action of constituent genes was investigated for yield improvement. In Module 2, the effect of malonyl-CoA supply on fatty acid/naringenin production was explored through up-regulation of acetyl-CoA production and down-regulation of fatty acid biosynthesis...
July 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28706492/lower-expression-of-slc27a1-enhances-intramuscular-fat-deposition-in-chicken-via-down-regulated-fatty-acid-oxidation-mediated-by-cpt1a
#18
Fengfang Qiu, Liang Xie, Jing-E Ma, Wen Luo, Li Zhang, Zhe Chao, Shaohao Chen, Qinghua Nie, Zhemin Lin, Xiquan Zhang
Intramuscular fat (IMF) is recognized as the predominant factor affecting meat quality due to its positive correlation with tenderness, juiciness, and flavor. Chicken IMF deposition depends on the balance among lipid synthesis, transport, uptake, and subsequent metabolism, involving a lot of genes and pathways, however, its precise molecular mechanisms remain poorly understood. In the present study, the breast muscle tissue of female Wenchang chickens (WC) (higher IMF content, 1.24 in D120 and 1.62 in D180) and female White Recessive Rock chickens (WRR; lower IMF content, 0...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28706274/elovanoids-are-novel-cell-specific-lipid-mediators-necessary-for-neuroprotective-signaling-for-photoreceptor-cell-integrity
#19
Bokkyoo Jun, Pranab K Mukherjee, Aram Asatryan, Marie-Audrey Kautzmann, Jessica Heap, William C Gordon, Surjyadipta Bhattacharjee, Rong Yang, Nicos A Petasis, Nicolas G Bazan
Docosahexaenoic acid (DHA, 22:6 n-3) is abundant in the retina and is enzymatically converted into pro-homeostatic docosanoids. The DHA- or eicosapentaenoic acid (EPA)-derived 26 carbon fatty acid is a substrate of elongase ELOVL4, which is expressed in photoreceptor cells and generates very long chain (≥C28) polyunsaturated fatty acids including n-3 (VLC-PUFAs,n-3). While ELOVL4 mutations are linked to vision loss and neuronal dysfunctions, the roles of VLC-PUFAs remain unknown. Here we report a novel class of lipid mediators biosynthesized in human retinal pigment epithelial (RPE) cells that are oxygenated derivatives of VLC-PUFAs,n-3; we termed these mediators elovanoids (ELV)...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28706006/integration-of-flux-measurements-to-resolve-changes-in-anabolic-and-catabolic-metabolism-in-cardiac-myocytes
#20
Andrew A Gibb, Pawel K Lorkiewicz, Yu-Ting Zheng, Xiang Zhang, Aruni Bhatnagar, Steven P Jones, Bradford G Hill
Although ancillary pathways of glucose metabolism are critical for synthesizing cellular building blocks and modulating stress responses, how they are regulated remains unclear.  In this study, we used radiometric glycolysis assays, [(13)C6]-glucose isotope tracing, and extracellular flux analysis to understand how phosphofructokinase (PFK)-mediated changes in glycolysis regulate glucose carbon partitioning into catabolic and anabolic pathways. Expression of kinase-deficient or phosphatase-deficient 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase in rat neonatal cardiomyocytes coordinately regulated glycolytic rate and lactate production...
July 13, 2017: Biochemical Journal
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