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phenylalanine metabolism

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https://www.readbyqxmd.com/read/29230603/amp-activated-protein-kinase-activation-in-mediating-phenylalanine-induced-neurotoxicity-in-experimental-models-of-phenylketonuria
#1
Lihua Lu, Xiaoming Ben, Lingling Xiao, Min Peng, Yongjun Zhang
Phenylketonuria (PKU), one of the most prevalent autosomal recessive disorders of amino acid metabolism, is characterized by abnormal accumulation of phenylalanine, which can lead to intellectual disability. The main pathologic changes in the central nervous system of untreated phenylketonuric patients are reductions in the number of axons, dendrites, and synapses in the brain. Such alterations are thought to be mainly associated with the toxic effects caused by phenylalanine. However, the underlying molecular mechanisms have not been fully elucidated...
December 11, 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/29230228/overexpression-of-smmyc2-increases-the-production-of-phenolic-acids-in-salvia-miltiorrhiza
#2
Na Yang, Wenping Zhou, Jiao Su, Xiaofan Wang, Lin Li, Liru Wang, Xiaoyan Cao, Zhezhi Wang
MYC2 is a core transcription factor in the plant response to jasmonates. It also functions in secondary metabolism and various processes for growth and development. However, the knowledge about its role in Salvia miltiorrhiza is still very limited. We determined that the biosynthesis of salvianolic acid B (Sal B) was strongly induced in 2-month-old transgenic plants that over-expressed SmMYC2. In the roots of transgenic line 12 that over-expressed SmMYC2 (OEM-12), the Sal B concentration was as high as 5.95 ± 0...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29229969/transcriptome-and-metabolome-profiling-of-narcissus-pseudonarcissus-king-alfred-reveal-components-of-amaryllidaceae-alkaloid-metabolism
#3
Aparna Singh, Isabel Desgagné-Penix
Amaryllidaceae alkaloids (AAs) represent a diverse class of plant specialized metabolites and many display potent pharmacological activities. The AA metabolic pathway is poorly understood and resources are minimal. To enable AA pathway elucidation and novel biosynthetic enzymes discovery, we generated comprehensive metabolomic and corresponding transcriptomic datasets from different tissues of Narcissus pseudonarcissus 'King Alfred'. In this study, we performed untargeted UPLC-QTOF-MS metabolite analysis from different tissues, which generated exhaustive list of compounds, including several AAs, most predominant and diverse in bulbs...
December 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29226610/nuclear-magnetic-resonance-based-metabolomics-identifies-phenylalanine-as-a-novel-predictor-of-incident-heart-failure-hospitalisation-results-from-prosper-and-finrisk-1997
#4
Christian Delles, Naomi J Rankin, Charles Boachie, Alex McConnachie, Ian Ford, Antti Kangas, Pasi Soininen, Stella Trompet, Simon P Mooijaart, J Wouter Jukema, Faiez Zannad, Mika Ala-Korpela, Veikko Salomaa, Aki S Havulinna, Paul Welsh, Peter Würtz, Naveed Sattar
AIMS: We investigated the association between quantified metabolite, lipid and lipoprotein measures and incident heart failure hospitalisation (HFH) in the elderly, and examined whether circulating metabolic measures improve HFH prediction. METHODS AND RESULTS: Overall, 80 metabolic measures from the PROspective Study of Pravastatin in the Elderly at Risk (PROSPER) trial were measured by proton nuclear magnetic resonance spectroscopy (n = 5341; 182 HFH events during 2...
December 11, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/29220111/phosphoenolpyruvate-transporter-enables-targeted-perturbation-during-metabolic-analysis-of-l-phenylalanine-production-with-escherichia-coli
#5
Julia Tröndle, Christoph Albermann, Michael Weiner, Georg A Sprenger, Dirk Weuster-Botz
Usually perturbation of the metabolism of cells by addition of substrates is applied for metabolic analysis of production organisms, but perturbation studies are restricted to the endogenous substrates of the cells under study. The goal of this study was to overcome this limitation by making phosphoenolpyruvate (PEP) available for perturbation studies with Escherichia coli producing L-phenylalanine. A production strain overexpressing a PEP-transporter variant (UhpT-D388C) was applied in a standardized fed-batch production-process on a 42 L-scale...
December 8, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29209335/identification-and-expression-profile-of-cypome-in-perennial-ryegrass-and-tall-fescue-in-response-to-temperature-stress
#6
Xiang Tao, Ming-Xiu Wang, Ya Dai, Yan Wang, Yan-Fen Fan, Ping Mao, Xin-Rong Ma
Plant cytochrome P450s are involved in a wide range of biosynthetic reactions that generate various biomolecules, including a variety of defensive compounds. Perennial ryegrass (Lolium perenne) and tall fescue (Festuca arundinacea) are two major species of turf and forage grasses that usually experience low temperature below -10°C and high temperature over 38°C around the world. In this study, we re-analyzed transcriptome of perennial ryegrass and tall fescue treated with heat and cold stress. Thus, we can evaluate P450 composition in these species and confirm whether P450 genes response to temperature stress...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29207610/integration-of-micrornaome-proteomics-and-metabolomics-to-analyze-arsenic-induced-malignant-cell-transformation
#7
Youyou Zhou, Yanfu Wang, Juan Su, Zheng Wu, Chao Wang, Weiming Zhong, Xiaomei Liu, Linhui Cui, Xiaoyu Zhou, Yufang Ma, Yi Xin, Jianglin Zhang, Lisha Wu, Xing Hu, Xiang Chen, Cong Peng, MingYang Gao
Long-term exposure to arsenic has been linked to tumorigenesis in different organs and tissues, such as skin; however, the detailed mechanism remains unclear. In this present study, we integrated "omics" including microRNAome, proteomics and metabolomics to investigate the potential molecular mechanisms. Compared with non-malignant human keratinocytes (HaCaT), twenty-six miRNAs were significantly altered in arsenic-induced transformed cells. Among these miRNAs, the differential expression of six miRNAs was confirmed using Q-RT-PCR, representing potential oxidative stress genes...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29198954/metabolic-reprogramming-of-hydrogenosomal-amino-acids-in-trichomonas-vaginalis-under-glucose-restriction
#8
Kuo-Yang Huang, Seow-Chin Ong, Chih-Ching Wu, Chia-Wei Hsu, Hsin-Chung Lin, Yi-Kai Fang, Wei-Hung Cheng, Po-Jung Huang, Cheng-Hsun Chiu, Petrus Tang
BACKGROUND: Glucose is the major energy source that is converted to pyruvate for ATP generation in the trichomonad hydrogenosome. Under glucose restriction (GR), the regulation of amino acids metabolism is crucial for trichomonad growth and survival. RNA-sequencing (RNA-seq) analysis has been used to identify differentially expressed genes in Trichomonas vaginalis under GR, leading to significant advances in understanding adaptive responses of amino acid metabolism to GR. However, the levels of amino acid metabolites modulated by GR are unknown in T...
November 21, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/29193598/pseudomonas-fluorescens-strain-r124-encodes-three-different-mio-enzymes
#9
Pál Csuka, Vivienn Juhász, Szabolcs Kohári, Alina Filip, Andrea Varga, Péter Sátorhelyi, László Csaba Bencze, Hazel A Barton, Csaba Paizs, Laszlo Poppe
A number of class I lyase-like enzymes including aromatic ammonia-lyases and aromatic 2,3-aminomutases containing the electrophilic 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO) catalytic moiety. This study reveals that Pseudomonas fluorescens R124 strain isolated from a nutrient limited cave encodes a histidine ammonia-lyase (HAL), a tyrosine/phenylalanine/histidine ammonia-lyase (XAL) and a phenylalanine 2,3-aminomutase (PAM), and demonstrates that an organism under nitrogen-limited conditions can develop novel nitrogen fixation and transformation pathways to enrich the possibility of the nitrogen metabolism by gaining a PAM via horizontal gene transfer...
November 28, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29187153/similar-but-different-structurally-related-azelaic-acid-and-hexanoic-acid-trigger-differential-metabolomic-and-transcriptomic-responses-in-tobacco-cells
#10
Arnaud T Djami-Tchatchou, Efficient N Ncube, Paul A Steenkamp, Ian A Dubery
BACKGROUND: Plants respond to various stress stimuli by activating an enhanced broad-spectrum defensive ability. The development of novel resistance inducers represents an attractive, alternative crop protection strategy. In this regard, hexanoic acid (Hxa, a chemical elicitor) and azelaic acid (Aza, a natural signaling compound) have been proposed as inducers of plant defense, by means of a priming mechanism. Here, we investigated both the mode of action and the complementarity of Aza and Hxa as priming agents in Nicotiana tabacum cells in support of enhanced defense...
November 29, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29186481/optimisation-of-trans-cinnamic-acid-and-hydrocinnamyl-alcohol-production-with-recombinant-saccharomyces-cerevisiae-and-identification-of-cinnamyl-methyl-ketone-as-a-by-product
#11
Manuela Gottardi, Peter Grün, Helge B Bode, Thomas Hoffmann, Wilfried Schwab, Mislav Oreb, Eckhard Boles
Trans-cinnamic acid (tCA) and hydrocinnamyl alcohol (HcinOH) are valuable aromatic compounds with applications in the flavour, fragrance and cosmetic industry. They can be produced with recombinant yeasts from sugars via phenylalanine after expression of a phenylalanine ammonia lyase (PAL) and an aryl carboxylic acid reductase (ACAR). Here we show that in Saccharomyces cerevisiae a PAL enzyme from the bacterium Photorhabdus luminescens was superior to a previously used plant PAL enzyme for the production of tCA...
November 23, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/29184644/incidence-of-neonatal-hyperphenylalaninemia-based-on-high-performance-liquid-chromatography-confirmatory-technique-in-mazandaran-province-northern-iran-2007-2015
#12
Ali Abbaskhanian, Daniel Zamanfar, Parvaneh Afshar, Einollah Asadpoor, Hamed Rouhanizadeh, Ali Jafarnia, Mohammad Shokzadeh
Background: Classic phenylketonuria (PKU) is a metabolic disorder. The purpose of this study was to assess epidemiological factors of PKU phenotypes in a neonatal screening program for Mazandaran, Iran. Methods: In this descriptive-retrospective study from 2007 to 2015, neonates PKU level was conducted by phenylalanine level based on a biochemical technique by ELISA and then by confirmatory methods high performance liquid chromatography. Results: Of the 407,244 screened newborns (48...
2017: International Journal of Preventive Medicine
https://www.readbyqxmd.com/read/29180991/gut-microbial-dysbiosis-is-associated-with-altered-hepatic-functions-and-serum-metabolites-in-chronic-hepatitis-b-patients
#13
Jing Wang, Yang Wang, Xu Zhang, Jiaqi Liu, Qianpeng Zhang, Yu Zhao, Jinghua Peng, Qin Feng, Jianye Dai, Shujun Sun, Yufeng Zhao, Liping Zhao, Yongyu Zhang, Yiyang Hu, Menghui Zhang
Chronic hepatitis B (CHB) is a global epidemic disease that results from hepatitis B virus (HBV) infection and may progress to severe liver failure, including liver fibrosis, cirrhosis and hepatocellular carcinoma. Previous evidence has indicated that the dysbiosis of gut microbiota occurs after liver virus infection and is associated with severe liver disease. The aim of this study is to elucidate the compositional and functional characteristics of the gut microbiota in early-stage CHB and to understand their influence on disease progression...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29172658/-tetrahydrobiopterin-bh4-deficiency-diagnosis-and-treatment
#14
János Bókay
Since the initial breaking discovery of Følling that the severe neurological consequences of phenylketonuria could be prevented by use of low phenylalanine (Phe) diet, it has been shortly recognised that defective phenylalanine metabolism may also arise from the deficiency of tetrahydrobiopterin (BH4) cofactor, required for phenylalanine-hydroxylase activity. Furthermore, as BH4 is in Phe metabolism, it is also a cofactor for the activities of tyrosine hydroxylase and tryptophane hydroxylase, enzymes required for the synthesis of catecholamines and serotonin neurotransmitters...
December 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/29168502/a-gut-bacterial-pathway-metabolizes-aromatic-amino-acids-into-nine-circulating-metabolites
#15
Dylan Dodd, Matthew H Spitzer, William Van Treuren, Bryan D Merrill, Andrew J Hryckowian, Steven K Higginbottom, Anthony Le, Tina M Cowan, Garry P Nolan, Michael A Fischbach, Justin L Sonnenburg
The human gut microbiota produces dozens of metabolites that accumulate in the bloodstream, where they can have systemic effects on the host. Although these small molecules commonly reach concentrations similar to those achieved by pharmaceutical agents, remarkably little is known about the microbial metabolic pathways that produce them. Here we use a combination of genetics and metabolic profiling to characterize a pathway from the gut symbiont Clostridium sporogenes that generates aromatic amino acid metabolites...
November 22, 2017: Nature
https://www.readbyqxmd.com/read/29164108/salicylic-acid-alleviates-aluminum-toxicity-in-soybean-roots-through-modulation-of-reactive-oxygen-species-metabolism
#16
Ning Liu, Fengbin Song, Xiancan Zhu, Jiangfeng You, Zhenming Yang, Xiangnan Li
As an important signal molecule, salicylic acid (SA) improves plant tolerance to aluminum (Al) stress. The objective of this study was to investigate the effects of exogenous SA application on the dynamics of endogenous SA and reactive oxygen species in soybean (Glycine max L.) exposed to Al stress. The roots of soybean seedlings were exposed to a combination of AlCl3 (30 μM) and SA (10 μM)/PAC (100 μM, paclobutrazol, SA biosynthesis inhibitor) for 3, 6, 9, and 12 h. Al stress induced an increase in endogenous SA concentration in a time-dependent manner, also verified by the up-regulated expression of GmNPR1, an SA-responsive gene...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29154227/generation-of-integration-free-induced-pluripotent-stem-cell-line-njmui001-a-from-a-phenylketonuria-patient
#17
Tianhui Xu, Dong Liang, Jingjing Zhang, Xiuqing Ji, Huanran Hu, Yun Sun, Tao Jiang, Xia Wang, Ping Hu, Zhengfeng Xu
PKU is a prevalent type of inherited metabolic disease, caused by the defective phenylalanine metabolism. In most PKU cases, mutations in the PAH gene could be found. Dysfunction of this hepatic enzyme will lead to diverse clinical symptoms due to a failure in converting phenylalanine into tyrosine. Here, we report an integration-free human induced pluripotent stem cell line (NJMUi001-A) generated from peripheral blood mononuclear cells of a PKU patient by using Sendai virus. This iPS cell line has characteristics of pluripotent stem cells and can be used as a useful tool for the investigation of this inherited metabolic disease...
November 10, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/29153023/-bone-metabolism-in-adults-with-phenylketonuria-hungarian-data
#18
András Gellért Barta, Csaba Sumánszki, Péter Reismann
INTRODUCTION: Patients with phenylketonuria have lower bone mineral density compared to healthy people, however, the ethiology of these alterations is not clear. Hungarian data were missing in this topic. AIM: The main aim of our study was to survey the correlation between metabolic control and change of bone mineral density in early treated Hungarian adult patients with phenylketonuria. METHOD: In this monocentric study bone mineral density of 59 adult PKU patients have been repeatedly measured in a 4-year interval using dual-energy X-ray absorptiometry...
November 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/29149492/effects-of-tao-hong-si-wu-decoction-on-acute-blood-stasis-in-rats-based-on-a-lc-q-tof-ms-metabolomics-and-network-approach
#19
Qi Ma, Peng-Ling Li, Yong-Li Hua, Peng Ji, Wan-Ling Yao, Xiao-Song Zhang, Li-Jia Zhong, Yan-Ming Wei
A novel approach using metabolomics coupled with a metabolic network was used to investigate the effects of THSWD on the rat model of acute blood stasis syndrome. Acute blood stasis syndrome was induced by placing the rats in ice-cold water following two injections with epinephrine. The hemorheological indicators (WBV and PV), and the blood coagulation indicators (TT, PT, APTT, and FIB) were detected. The nonparametric univariate method and multivariate statistical analysis were performed for determining the potential biomarkers...
November 17, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29146265/sawr-a-new-regulator-controlling-pyomelanin-synthesis-in-pseudomonas-aeruginosa
#20
Yossi Ben-David, Elena Zlotnik, Itzhak Zander, Gal Yerushalmi, Sivan Shoshani, Ehud Banin
Surface Acoustic Waves (SAW) were previously shown to inhibit biofilm formation, increase bacterial susceptibility to antibiotic treatment and alter the transcription pattern of Pseudomonas aeruginosa. Here we characterize one gene, sawR (PA3133), that is highly overexpressed when P. aeruginosa is exposed to SAW. SawR is a putative transcription factor belonging to the TetR regulator family. When overexpressed sawR causes numerous phenotypes, including the accumulation of a brown pigment which we identified as pyomelanin...
January 2018: Microbiological Research
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