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Free form amino acids

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https://www.readbyqxmd.com/read/28330564/proteomic-analysis-of-stipe-explants-reveals-differentially-expressed-proteins-involved-in-early-direct-somatic-embryogenesis-of-the-tree-fern-cyathea-delgadii-sternb
#1
Lucyna Domżalska, Sylwia Kędracka-Krok, Urszula Jankowska, Małgorzata Grzyb, Mirosław Sobczak, Jan J Rybczyński, Anna Mikuła
Using cyto-morphological analysis of somatic embryogenesis (SE) in the tree fern Cyathea delgadii as a guide, we performed a comparative proteomic analysis in stipe explants undergoing direct SE. Plant material was cultured on hormone-free medium supplemented with 2% sucrose. Phenol extracted proteins were separated using two-dimensional gel electrophoresis (2-DE) and mass spectrometry was performed for protein identification. A total number of 114 differentially regulated proteins was identified during early SE, i...
May 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28330241/purification-characterization-gene-cloning-and-expression-of-gh-10-xylanase-penicillium-citrinum-isolate-hzn13
#2
Zabin K Bagewadi, Sikandar I Mulla, Harichandra Z Ninnekar
An extracellular thermostable xylanase (Xyl-IIb) produced by Penicillium citrinum isolate HZN13 was purified to homogeneity using DEAE-Sepharose, Sephadex G-100 and Bio-Gel P-60 chromatography with specific activity of 6272.7 U/mg and 19.6-fold purification. The purification revealed the occurrence of multiple forms of xylanases (Xyl-I, Xyl-IIa, Xyl-IIb and Xyl-III). The molecular mass of highly purified Xyl-IIb was ~31 kDa with SDS-PAGE. The enzyme was cellulase-free, thermostable (55-75 °C) and acidophilic (3...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28320885/identification-of-the-lyso-form-n-acyl-intramolecular-transferase-in-low-gc-firmicutes
#3
Krista M Armbruster, Timothy C Meredith
Bacterial lipoproteins are embedded in the cell membrane of both Gram-positive and Gram-negative bacteria where they serve numerous functions central to cell envelope physiology. Lipoproteins are tethered to the membrane by an N-acyl-S-(mono/di)-acyl-glyceryl-cysteine anchor that is variably acylated depending on genera. In several low-GC Gram-positive Firmicutes, a monoacyl-glyceryl-cysteine with an N-terminal fatty acid (known as the lyso form) has been reported, though how it is formed is unknown. Here, through an intergenic complementation rescue assay in Escherichia coli, we report the identification of a common orthologous transmembrane protein in both Enterococcus faecalis and Bacillus cereus capable of forming lyso-form lipoproteins...
March 20, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28300263/size-specific-emission-in-peptide-capped-gold-quantum-clusters-with-tunable-photoswitching-behavior
#4
Abhishek Baral, Kingshuk Basu, Sirshendu Ghosh, Kalishankar Bhattacharyya, Subhasish Roy, Ayan Datta, Arindam Banerjee
Three different types of fluorescent gold clusters (namely blue, green and red emitting) have been prepared from a gold precursor (chloroauric acid) under moderate conditions in aqueous medium. A cysteine containing dipeptide has been used for the formation of these quantum clusters as this peptide molecule contains a thiol group in the side chain to cap these nascently formed clusters and the free amino and carboxylic moieties assist in water solubility. Thus, the clusters are also environmentally friendly as the capped peptide is made up of only naturally occurring protein amino acids...
March 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28296402/synthesis-of-diastereoenriched-oxazolo-5-4-b-indoles-via-catalyst-free-multicomponent-bicyclizations
#5
Lu Wang, Li-Xia Shi, Lu Liu, Zhuo-Xuan Li, Ting Xu, Wen-Juan Hao, Guigen Li, Shu-Jiang Tu, Bo Jiang
A new and highly eco-friendly approach to diverse and functionalized oxazolo[5,4-b]indoles with good yield and high diastereoselectivity (up to >99:1) has been disclosed from simple and readily available arylglyoxals with cyclic enaminones and amino acids. These microwave-assisted transformations in environmentally compatible ethanol resulted in continuous multiple bond-forming events including C-C, C-N and C-O bonds, enabling catalyst-free multicomponent bicyclizations to rapidly build up functional N,O-heterocycles...
March 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28286649/protein-hydrolysates-in-animal-nutrition-industrial-production-bioactive-peptides-and-functional-significance
#6
REVIEW
Yongqing Hou, Zhenlong Wu, Zhaolai Dai, Genhu Wang, Guoyao Wu
Recent years have witnessed growing interest in the role of peptides in animal nutrition. Chemical, enzymatic, or microbial hydrolysis of proteins in animal by-products or plant-source feedstuffs before feeding is an attractive means of generating high-quality small or large peptides that have both nutritional and physiological or regulatory functions in livestock, poultry and fish. These peptides may also be formed from ingested proteins in the gastrointestinal tract, but the types of resultant peptides can vary greatly with the physiological conditions of the animals and the composition of the diets...
2017: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/28280600/structural-basis-of-a-novel-pd-l1-nanobody-for-immune-checkpoint-blockade
#7
Fei Zhang, Hudie Wei, Xiaoxiao Wang, Yu Bai, Pilin Wang, Jiawei Wu, Xiaoyong Jiang, Yugang Wang, Haiyan Cai, Ting Xu, Aiwu Zhou
The use of antibodies to target immune checkpoints, particularly PD-1/PD-L1, has made a profound impact in the field of cancer immunotherapy. Here, we identified KN035, an anti-PD-L1 nanobody that can strongly induce T-cell responses and inhibit tumor growth. The crystal structures of KN035 complexed with PD-L1 and free PD-L1, solved here at 1.7 and 2.7 Å resolution, respectively, show that KN035 competes with PD-1 (programmed death protein 1) for the same flat surface on PD-L1, mainly through a single surface loop of 21 amino acids...
2017: Cell Discovery
https://www.readbyqxmd.com/read/28278760/computational-characterization-of-residue-couplings-and-micropolymorphism-induced-changes-in-the-dynamics-of-two-differentially-disease-associated-human-mhc-class-i-alleles
#8
Onur Serçinoğlu, Pemra Ozbek
Human major histocompatibility complex class I (MHC I) - or human leukocyte antigen (HLA) - proteins present intracellularly processed peptides to cytotoxic T lymphocytes in the adaptive immune response to pathogens. A high level of polymorphism in human MHC I proteins defines the peptide-binding specificity of thousands of different MHC alleles. However, polymorphism as well as the peptide ligand can also affect the global dynamics of the complex. In this study, we conducted classical molecular dynamics simulations of two HLA alleles, the ankylosing spondylitis (AS) associated/tapasin-dependent HLA-B*27:05 and nondisease-associated/tapasin-independent HLA-B*27:09, both in peptide-free forms as well as complex with four different peptides ligands...
March 1, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28255501/chemical-composition-physicochemical-characteristics-and-nutritional-value-of-lannea-kerstingii-seeds-and-seed-oil
#9
Judicaël Thomas Ouilly, Patrice Bazongo, Adjima Bougma, Nèbpawindé Kaboré, Anne Mette Lykke, Amadé Ouédraogo, Imaël Henri Nestor Bassolé
The chemical composition, main physicochemical properties, and nutritional value of seed flour and seed oil of Lannea kerstingii were studied. The results indicated that seeds contained 3.61% moisture, 57.85% fat, 26.39% protein, 10.07% carbohydrates, and 2.08% ash. Potassium was the predominant mineral, followed by magnesium and calcium. The essential amino acids were at higher levels than the estimated amino acid requirements of FAO/WHO/UNU except for lysine. Fatty acid composition showed that oleic acid was the major fatty acid, followed by palmitic, linoleic, and stearic acids...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28251953/-suppression-of-telomerase-activity-leukemic-cells-by-mutant-forms-of-rhodospirillum-rubrum-l-asparaginase
#10
M V Pokrovskaya, D D Zhdanov, M A Eldarov, S S Aleksandrova, A V Veselovskiy, V S Pokrovskiy, D V Grishin, Ju A Gladilina, N N Sokolov
The active and stable mutant forms of short chain cytoplasmic L-asparaginase type I of Rhodospirillum rubrum (RrA): RrA+N17, D60K, F61L, RrA+N17, A64V, E67K, RrA+N17, E149R, V150P, RrAE149R, V150P and RrAE149R, V150P, F151T were obtained by the method of site-directed mutagenesis. It is established that variants RrA-N17, E149R, V150P, F151T and RrАE149R, V150P are capable to reduce an expression hTERT subunit of telomerase and, hence, activity of telomeres in Jurkat cells, but not in cellular lysates. During too time, L-asparaginases of Escherichia coli, Erwinia carotovora and Wolinella succinogenes, mutant forms RrА+N17, D60K, F61L and RrА+N17, A64V, E67K do not suppress of telomerase activity...
January 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28249031/a-de-novo-variant-in-the-asprv1-gene-in-a-dog-with-ichthyosis
#11
Anina Bauer, Dominik P Waluk, Arnaud Galichet, Katrin Timm, Vidhya Jagannathan, Beyza S Sayar, Dominique J Wiener, Elisabeth Dietschi, Eliane J Müller, Petra Roosje, Monika M Welle, Tosso Leeb
Ichthyoses are a heterogeneous group of inherited cornification disorders characterized by generalized dry skin, scaling and/or hyperkeratosis. Ichthyosis vulgaris is the most common form of ichthyosis in humans and caused by genetic variants in the FLG gene encoding filaggrin. Filaggrin is a key player in the formation of the stratum corneum, the uppermost layer of the epidermis and therefore crucial for barrier function. During terminal differentiation of keratinocytes, the precursor profilaggrin is cleaved by several proteases into filaggrin monomers and eventually processed into free amino acids contributing to the hydration of the cornified layer...
March 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28236690/binding-interaction-of-sodium-n-dodecanoyl-sarcosinate-with-hemoglobin-and-myoglobin-physicochemical-and-spectroscopic-studies-with-molecular-docking-analysis
#12
Suparna Rudra, Somnath Dasmandal, Ambikesh Mahapatra
The interaction of an amino acid surfactant, sodium-N-dodecanoyl sarcosinate (SDDS), with two heme proteins, hemoglobin (Hb) and myoglobin (Mb), has been studied employing various physicochemical and spectroscopic techniques like tensiometry, UV-Vis spectroscopy, steady-state fluorometry, time-resolved fluorometry, circular dichroism (CD) spectroscopy, calorimetry and stopped flow kinetics at physiological pH of 7.2 and 298K. Tensiometric and fluorometric analysis suggest that the interaction between SDDS and protein starts with the monomer form of the surfactant which produces small induced micelles...
February 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28207514/arginine-methylation-dysfunction-increased-risk-of-acute-coronary-syndrome-in-coronary-artery-disease-population-a-case-control-study
#13
Shengyu Zhang, Shuyang Zhang, Hongyun Wang, Wei Wu, Yicong Ye
The plasma levels of asymmetric dimethylarginine (ADMA) had been proved to be an independent cardiovascular risk factor. Few studies involved the entire arginine methylation dysfunction. This study was designed to investigate whether arginine methylation dysfunction is associated with acute coronary syndrome risk in coronary artery disease population.In total 298 patients undergoing coronary angiography because of chest pain with the diagnosis of stable angina pectoris or acute coronary syndrome from February 2013 to June 2014 were included...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28188781/the-cyanobacterial-fluorescence-recovery-protein-has-two-distinct-activities-orange-carotenoid-protein-amino-acids-involved-in-frp-interaction
#14
Adrien Thurotte, Céline Bourcier de Carbon, Adjélé Wilson, Léa Talbot, Sandrine Cot, Rocio López-Igual, Diana Kirilovsky
To deal with fluctuating light condition, cyanobacteria have developed a photoprotective mechanism which, under high light conditions, decreases the energy arriving at the photochemical centers. It relies on a photoswitch, the Orange Carotenoid Protein (OCP). Once photoactivated, OCP binds to the light harvesting antenna, the phycobilisome (PBS), and triggers the thermal dissipation of the excess energy absorbed. Deactivation of the photoprotective mechanism requires the intervention of a third partner, the Fluorescence Recovery Protein (FRP)...
April 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28183305/controlling-of-growth-performance-lipid-deposits-and-fatty-acid-composition-of-chicken-meat-through-a-probiotic-lactobacillus-johnsonii-during-subclinical-clostridium-perfringens-infection
#15
Hesong Wang, Xueqin Ni, Lei Liu, Dong Zeng, Jing Lai, Xiaodan Qing, Guangyao Li, Kangcheng Pan, Bo Jing
BACKGROUND: Meat is considered as a major source of polyunsaturated fatty acid (PUFA) which is essential for humans, therefore its lipid level and fatty acid composition have drawn great attention. As no clinical sign can be found in chicks subclinically infected by Clostridium perfringens (CP), the meat may be purchased and eaten. The objective of the present study was to determine whether Lactobacillus johnsonii (LJ) can control the CP-caused impact on growth, lipid levels, fatty acid composition and other flavor or nutritional quality in the meat...
February 10, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28169479/helical-oligopeptides-of-a-quaternized-amino-acid-with-tunable-chiral-induction-ability-and-an-anomalous-ph-response
#16
Joonil Cho, Yasuhiro Ishida, Takuzo Aida
A series of octamer (8mer) and hexadecamer (16mer) oligopeptides of 4-aminopiperidine-4-carboxylic acid (Api) with L-leucine as a chiral auxiliary at their N- or C-termini were synthesized. Using circular dichroism spectroscopy, the conformational profiles of the peptides were systematically studied, which revealed that the α-helix formation ability of the peptides is determined by the combination of parameters including peptide length, state of the piperidine groups in the Api units, and position of the chiral auxiliary...
February 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28159615/immobilization-of-r-%C3%AF-transaminase-on-mno2-nanorods-for-catalyzing-the-conversion-of-r-1-phenylethylamine
#17
Jian Sun, Wen-Hui Cui, Kun Du, Qian Gao, Mengmeng Du, Peijun Ji, Wei Feng
R-ɷ-transaminases transfer an amino group from an amino donor (e.g. (R)-1-phenylethylamine) onto an amino acceptor (e.g. pyruvate), resulting a co-product (e.g. d-alanine). This work intends to immobilize R-ɷ-Transaminase on MnO2 nanorods to achieve multienzyme catalysis. R-ɷ-Transaminase (RTA) and d-amino acid oxidase (DAAO) have been fused to an elastin-like polypeptide (ELP) separately through genetic engineering of the enzymes. ELP-RTA and ELP-DAAO have been separately immobilized on polydopamine-coated MnO2 nanorods...
March 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28150934/luminescent-difluoroboron-%C3%AE-diketonate-pla-peg-nanoparticle
#18
Caroline Kerr, Christopher A DeRosa, Margaret L Daly, Hengtao Zhang, Gregory M Palmer, Cassandra L Fraser
Luminescent difluoroboron β-diketonate poly(lactic acid) (BF2bdkPLA) materials serve as biological imaging agents. In this study, dye structures were modified to achieve emission colors that span the visible region with potential for multiplexing applications. Four dyes with varying π-conjugation (phenyl, naphthyl) and donor groups (-OMe, -NMe2) were coupled to PLLA-PEG block copolymers (∼11 kDa) by a postpolymerization Mitsunobu reaction. The resulting dye-polymer conjugates were fabricated as nanoparticles (∼55 nm diameter) to produce nanomaterials with a range of emission colors (420-640 nm)...
February 2, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28149525/self-assembled-peg-b-pdpa-b-pgem-copolymer-nanoparticles-as-protein-antigen-delivery-vehicles-to-dendritic-cells-preparation-characterization-and-cellular-uptake
#19
Pan Li, Junhui Zhou, Pingsheng Huang, Chuangnian Zhang, Weiwei Wang, Chen Li, Deling Kong
Antigen uptake by dendritic cells (DCs) is a key step for initiating antigen-specific T cell immunity. In the present study, novel synthetic polymeric nanoparticles were prepared as antigen delivery vehicles to improve the antigen uptake by DCs. Well-defined cationic and acid-responsive copolymers, monomethoxy poly(ethylene glycol)-block-poly(2-(diisopropyl amino) ethyl methacrylate)-block-poly(2-(guanidyl) ethyl methacrylate) (mPEG-b-PDPA-b-PGEM, PEDG) were synthesized by reversible addition-fragmentation chain transfer polymerization of 2-(diisopropylamino)ethyl methacrylate) and N-(tert-butoxycarbonyl) amino ethyl methacrylate monomers, followed by deprotection of tert-butyl protective groups and guanidinylation of obtained primary amines...
February 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/28112514/detection-of-free-advanced-glycation-end-products-in-vivo-during-hemodialysis
#20
Christoph Hohmann, Kristin Liehr, Christian Henning, Roman Fiedler, Matthias Girndt, Michael Gebert, Michael Hulko, Markus Storr, Marcus A Glomb
Advanced glycation end products (AGEs) are often regarded as glycotoxins, which are normally removed by the kidney. Patients with end-stage renal failure rely on hemodialysis (HD) treatment to eliminate these compounds. In the present work, a highly selective LC-MS/MS method was used for quantitation of AGE levels in plasma and in dialysis fluids of HD patients, with a focus on AGE-free adducts. A broad range of 19 amino acid modifications was identified and quantitated. It was expected that the AGE-free adducts are successfully eliminated by dialysis treatment...
February 1, 2017: Journal of Agricultural and Food Chemistry
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