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D-amino acid oxidase

Enas I Mohamed, Mohamed A Zaki, Narayan D Chaurasiya, Asmaa I Owis, Sameh AbouZid, Yan-Hong Wang, Bharathi Avula, Ahmed A Seida, Babu L Tekwani, Samir A Ross
Bioassay-guided fractionation and chemical investigation of Colvillea racemosa stems led to identification of two new α, β-dihydroxydihydrochalcones, colveol A (1) and colveol B (2) along with fifteen known compounds. The structures were elucidated via interpretation of spectroscopic data. The absolute configurations of the dihydrochalcones 1 and 2 were assigned by a combination of chemical modification and electronic circular dichroism data. The isolated compounds were evaluated for their inhibition activity toward recombinant human monoamine oxidases (rhMAO-A and -B)...
November 14, 2017: Fitoterapia
Cheng Chen, Qiang Li, Qiangfeng Wang, Daihua Lu, Hong Zhang, Jian Wang, Rongtao Fu
Ganoderma is well known for its use in traditional Chinese medicine and is widely cultivated in China, Korea, and Japan. Increased temperatures associated with global warming are negatively influencing the growth and development of Ganoderma. Nitric oxide is reported to play an important role in alleviating fungal heat stress (HS). However, the transcriptional profiling of Ganoderma oregonense in response to HS, as well as the transcriptional response regulated by NO to cope with HS has not been reported. We used RNA-Seq technology to generate large-scale transcriptome data from G...
November 16, 2017: Scientific Reports
Vinita Jagannath, Zacharias Faidon Brotzakis, Michele Parrinello, Susanne Walitza, Edna Grünblatt
Dysfunction of D-amino acid oxidase (DAO) and DAO activator (DAOA)/G72 genes have been linked to neuropsychiatric disorders. The glutamate hypothesis of schizophrenia has proposed that increased DAO activity leads to decreased D-serine, which subsequently may lead to N-methyl-D-aspartate (NMDA) receptor hypofunction. It has been shown that DAOA binds to DAO and increases its activity. However, there are also studies showing DAOA decreases DAO activity. Thus, the effect of DAOA on DAO is controversial. We aimed to understand the effect of DAOA on DAO activity in neuron-like (SH-SY5Y), astrocyte-like (1321N1) and kidney-like (HEK293) human cell lines...
2017: Frontiers in Molecular Neuroscience
Kazukuni Hayashi, Hans-Jürgen Busse, Jan Golke, James Anderson, Xuehua Wan, Shaobin Hou, Patrick S G Chain, Rebecca D Prescott, Stuart P Donachie
A Gram-negative, rod-shaped bacterium, designated KH87(T), was isolated from a fishing hook that had been baited and suspended in seawater off O'ahu, Hawai'i. Based on a comparison of 1524 nt of the 16S rRNA gene sequence of strain KH87(T), its nearest neighbours were the GammaproteobacteriaRheinheimera nanhaiensis E407-8(T) (96.2 % identity), Rheinheimera chironomi K19414(T) (96.0 %), Rheinheimera pacifica KMM 1406(T) (95.8 %), Rheinheimera muenzenbergensis E49(T) (95.7 %), Alishewanella solinquinati KMK6(T) (94...
November 7, 2017: International Journal of Systematic and Evolutionary Microbiology
Guoqin Hu, Chengqing Yang, Lei Zhao, Yong Fan, Qinyu Lv, Jing Zhao, Minghuan Zhu, Xiangqing Guo, Chenxi Bao, Ahong Xu, Yong Jie, Yaqing Jiang, Chen Zhang, Shunying Yu, Zuowei Wang, Zezhi Li, Zhenghui Yi
Although many major breakthrough had identificated potential susceptibility genes for schizophrenia, the aetiology of schizophrenia is still unknown. In the present study, we focused on the N-methyl-Daspartate receptors related genes nitric oxide synthase 1 adaptor gene (NOS1AP), disrupted in schizophrenia 1 gene (DISC1), d-amino acid oxidase activator gene (DAOA), and glycogen synthase kinase 3-beta gene (GSK3B). A family-based genetic association study (459 Han Chinese subjects in 153 nuclear families) using 3 single nucleotide polymorphisms in NOS1AP, 2 in DISC1, 1 in DAOA and 1 in GSK3B was conducted...
October 31, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
Chieh-Hsin Lin, Hui-Ting Yang, Chih-Chiang Chiu, Hsien-Yuan Lane
Feasible peripheral biomarker for Alzheimer's disease (AD) is lacking. Dysregulation of N-methyl-D-aspartate (NMDA) receptor is implicated in the pathogenesis of AD. D-amino acid oxidase (DAO) and amino acids can regulate the NMDA receptor function. This study aimed to examine whether peripheral DAO and amino acids levels are characteristic of age-related cognitive decline. We enrolled 397 individuals (including amnestic mild cognitive impairment (MCI), mild AD, moderate to severe AD, and healthy elderly). DAO levels in the serum were measured using ELISA...
November 1, 2017: Scientific Reports
Shuang Zhang, Qingcong Wei, Yinghui Shang, Qi Zhang, Qigang Wang
The metabolism of d-serine by d-amino acid oxidase was developed to induce radical polymerization and formation of a powder-remoldable PAAM-CS hydrogel.
October 25, 2017: Chemical Communications: Chem Comm
David M Howard, Mark J Adams, Toni-Kim Clarke, Eleanor M Wigmore, Yanni Zeng, Saskia P Hagenaars, Donald M Lyall, Pippa A Thomson, Kathryn L Evans, David J Porteous, Reka Nagy, Caroline Hayward, Chris S Haley, Blair H Smith, Alison D Murray, G David Batty, Ian J Deary, Andrew M McIntosh
BACKGROUND: Cognitive ability is a heritable trait with a polygenic architecture, for which several associated variants have been identified using genotype-based and candidate gene approaches. Haplotype-based analyses are a complementary technique that take phased genotype data into account, and potentially provide greater statistical power to detect lower frequency variants. METHODS: In the present analysis, three cohort studies (n total = 48,002) were utilised: Generation Scotland: Scottish Family Health Study (GS:SFHS), the English Longitudinal Study of Ageing (ELSA), and the UK Biobank...
2017: Wellcome Open Research
Chenyin Wang, Valeria Saar, Ka Lai Leung, Liang Chen, Garry Wong
Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the presence of extracellular amyloid plaques consisting of Amyloid-β peptide (Aβ) aggregates and neurofibrillary tangles formed by aggregation of hyperphosphorylated microtubule-associated protein tau. We generated a novel invertebrate model of AD by crossing Aβ1-42 (strain CL2355) with either pro-aggregating tau (strain BR5270) or anti-aggregating tau (strain BR5271) pan-neuronal expressing transgenic Caenorhabditis elegans...
October 2, 2017: Neurobiology of Disease
Vinita Jagannath, Miriam Gerstenberg, Christoph U Correll, Susanne Walitza, Edna Grünblatt
The glutamate hypothesis of schizophrenia is related to the proposed dysregulation of D-amino acid oxidase (DAO), DAO activator (DAOA)/G72, and Neuregulin 1 (NRG1) genes. Genetic studies have shown significant associations between DAO, DAOA, NRG1 single-nucleotide polymorphisms (SNPs), and schizophrenia. The systematic literature search yielded 6, 5, and 18 new studies for DAO, DAOA, and NRG1 published after 2011 and not included in the previous SchizophreniaGene (SZGene) meta-analysis. We conducted meta-analyses of 20, 23, and 48 case-control studies, respectively, to comprehensively evaluate the association of 8 DAO, 12 DAOA, and 14 NRG1 SNPs with schizophrenia...
September 1, 2017: Journal of Neural Transmission
Rizvan Uluisik, Elvira Romero, Giovanni Gadda
The effect of temperature on the reaction of alcohol oxidation catalyzed by choline oxidase was investigated with the S101A variant of choline oxidase. Anaerobic enzyme reduction in a stopped-flow spectrophotometer was biphasic using either choline or 1,2-[(2)H4]-choline as a substrate. The limiting rate constants klim1 and klim2 at saturating substrate were well separated (klim1/klim2>9), and were >15-fold slower than for wild-type choline oxidase. Solvent deuterium kinetic isotope effects (KIEs) ~4 established that klim1 probes the proton transfer from the substrate hydroxyl to a catalytic base...
August 24, 2017: Biochimica et Biophysica Acta
D Zappi, R Caminiti, G M Ingo, C Sadun, C Tortolini, M L Antonelli
Main purpose of the work is assembling, testing and optimizing new disposable amperometric biosensors to analyze substances in different application fields as agribusiness, clinical chemistry and environment protection. Many kinds of modified electrodes have been prepared and tested to build portable devices to analyze quickly many analytes, in a simple and cost-effective manner. Bare electrodes of the screen-printed type, with silver as reference, have been used for modification. The glassy carbon electrodes with multi-walled carbon nanotubes or graphene or gold nanoparticles depositions were modified with generation IV ionic liquids...
December 1, 2017: Talanta
Weiyu Wang, Jiaqi Sun, Wenjun Xiao, Li Jiang, Ruyue Wang, Jun Fan
OBJECTIVES: To optimize the production of active inclusion bodies (IBs) containing human D-amino acid oxidase (hDAAO) in Escherichia coli. RESULTS: The optimized initial codon region combined with the coexpressed rare tRNAs, fusion of each of the N-terminal partners including cellulose-binding module, thioredoxin, glutathione S-transferase and expressivity tag, deletion of the incorporated linker, and improvement of tRNA abundance affected the production and activity for oxidizing D-alanine of the hDAAO in IBs...
November 2017: Biotechnology Letters
Qi Kuang, Sheng Zhang, Pingzhi Wu, Yaping Chen, Meiru Li, Huawu Jiang, Guojiang Wu
Jatropha curcas L. is an important biofuel plant with excellent tolerance of barren environments. However, studies on the regulatory mechanisms that operate in this plant in response to nitrogen (N) shortage are scarce. In this study, genome-wide transcriptional profiles of the roots and leaves of 8-week old physic nut seedlings were analyzed after 2 and 16 days of N starvation. Enrichment results showed that genes associated with N metabolism, processing and regulation of RNA, and transport predominated among those showing alterations in expression...
2017: PloS One
Gianluca Molla, Roberta Melis, Loredano Pollegioni
Enantiomerically pure amino acids are of increasing interest for the fine chemical, agrochemicals and pharmaceutical industries. During past years l-amino acids have been produced from deracemization of dl-solution employing the stereoselective flavoenzyme d-amino acid oxidase. On the other hand, the isolation of corresponding d-isomer was hampered by the scarce availability of a suitable l-amino acid oxidase activity. On this side, l-amino acid deaminase (LAAD), only present in the Proteus bacteria, represents a suitable alternative...
November 1, 2017: Biotechnology Advances
Eimear Howley, Michael Bestwick, Rosa Fradley, Helen Harrison, Mathew Leveridge, Kengo Okada, Charlotte Fieldhouse, Will Farnaby, Hannah Canning, Andy P Sykes, Kevin Merchant, Katherine Hazel, Catrina Kerr, Natasha Kinsella, Louise Walsh, David G Livermore, Isaac Hoffman, Jonathan Ellery, Phillip Mitchell, Toshal Patel, Mark Carlton, Matt Barnes, David J Miller
Irregular N-methyl-D-aspartate receptor (NMDAR) function is one of the main hypotheses employed to facilitate understanding of the underlying disease state of schizophrenia. Although direct agonism of the NMDAR has not yielded promising therapeutics, advances have been made by modulating the NMDAR co-agonist site which is activated by glycine and D-serine. One approach to activate the co-agonist site is to increase synaptic D-serine levels through inhibition of D-amino acid oxidase (DAO), the major catabolic clearance pathway for this and other D-amino acids...
November 2017: Neurochemical Research
Cleverson D T Freitas, Deborah C Freitas, Wallace T Cruz, Camila T M N Porfírio, Maria Z R Silva, Jefferson S Oliveira, Cristina Paiva S Carvalho, Márcio V Ramos
Germin-like proteins (GLPs) have been identified in several plant tissues. However, only one work describes GLP in latex fluids. Therefore, the goal of this study was to investigate GLPs in latex and get new insights concerning the structural and functional aspects of these proteins. Two complete sequences with high identity (>50%) with other GLPs, termed CpGLP1 and CpGLP2, were obtained and consecutively presented 216 and 206 amino acid residues, corresponding to molecular masses of 22.7 and 21.7kDa, pI 6...
December 2017: International Journal of Biological Macromolecules
Brwa Rasool, Jack McGowan, Daria Pastok, Sue E Marcus, Jenny A Morris, Susan R Verrall, Peter E Hedley, Robert D Hancock, Christine H Foyer
The mechanisms underpinning plant perception of phloem-feeding insects, particularly aphids, remain poorly characterized. Therefore, the role of apoplastic redox state in controlling aphid infestation was explored using transgenic tobacco (Nicotiana tabacum) plants that have either high (PAO) or low (TAO) ascorbate oxidase (AO) activities relative to the wild type. Only a small number of leaf transcripts and metabolites were changed in response to genotype, and cell wall composition was largely unaffected. Aphid fecundity was decreased significantly in TAO plants compared with other lines...
September 2017: Plant Physiology
Biswajit Bose, Hiranjit Choudhury, Pramod Tandon, Suman Kumaria
Malaxis acuminata D. Don., a small, terrestrial orchid, is endemic to tropical Himalayas at an altitude of 1200-2000m asl. The dried pseudobulbs are important ingredients of century old ayurvedic drug 'Ashtavarga' and a polyherbal immune-booster nutraceutical 'Chyavanprash', known to restore vigour, vitality and youthfulness. Considering tremendous medicinal importance of this threatened orchid species, a detailed study was undertaken for the first time to address its antioxidant potential, secondary metabolite contents and biological activities against skin-aging related enzymes (anti-collagenase, anti-elastase, anti-tyrosinase and xanthine oxidase) and anti-inflammatory activity (5-lipoxygenase and hyaluronidase) in different plant parts of wild and in vitro-derived plants of M...
August 2017: Journal of Photochemistry and Photobiology. B, Biology
Junxian Zheng, Taowei Yang, Junping Zhou, Meijuan Xu, Xian Zhang, Zhiming Rao, Shangtian Yang
Native d-amino acid oxidase (DAAO) that is expressed mostly as inclusion body and its toxicity for E. coli hamper efficient heterologous expression. In this study, the soluble expression of DAAO from Rhodosporidium toruloides (RtDAAO) was improved in E. coli through N-terminal modification, but the cell biomass was decreased. Then a trade-off between DAAO expression and biomass was achieved to obtain the highest volumetric activity of DAAO through regulated the number of N-terminus histidine residues. When variant (2)H(3)G was fused with three N-terminus histidine residues, the volumetric activity was increased by 3...
November 2017: Bioresource Technology
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