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https://www.readbyqxmd.com/read/28724261/development-of-a-sandwich-enzyme-linked-immunosorbent-assay-for-dtmp-gh-fusion-protein-by-rational-immunogen-selection
#1
Song Wang, Mingqiang Shen, Shilei Chen, Cheng Wang, Fang Chen, Mo Chen, Gaomei Zhao, Xinze Ran, Tianmin Cheng, Yongping Su, Yang Xu, Junping Wang
dTMP-GH is a chimeric protein containing a tandem dimer of thrombopoietin mimetic peptide (dTMP) fused to human growth hormone (hGH) prepared previously by our team. It shows significant bioactivity in promoting thrombocytopoiesis, but detection of intact dTMP-GH in plasma is still a challenge due to the presence of endogenous hGH. In this study, a rabbit polyclonal antibody with high affinity to dTMP was obtained with a BSA-conjugated immunogen composed of 20 amino acids sequence spanning two TMP and the linker...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28721727/synthesis-of-intricate-fused-n-heterocycles-via-ring-rearrangement-metathesis
#2
Sambasivarao Kotha, Rama Gunta
Herein, a facile synthesis of intricate fused N-heterocycles has been disclosed by employing C-H activation and ring-rearrangement metathesis/enyne ring-rearrangement metathesis as key steps. Interestingly, some of these N-heterocyclic products possess the tricyclic core of epimeloscine, deoxycalyciphylline B, daphlongamine H, isodaphlongamine H and a bioactive alkaloid, annotinolide A, which shows anti-aggregation activity against amyloid-β (Aβ)1-42 peptide aggregation. Moreover, various starting materials required in this protocol are easily assembled via C-X bond annulation of 2-bromo-N-protected aniline with norbornadiene or directing group-assisted ruthenium-catalyzed C-H activation of N-methoxybenzamide...
July 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28721399/nutritional-and-functional-properties-of-fishmeal-produced-from-fresh-by-products-of-cod-gadus-morhua-l-and-saithe-pollachius-virens
#3
Ola Ween, Janne K Stangeland, Turid S Fylling, Grete Hansen Aas
Fresh by-products of whitefish such as cod and saithe is processed to fishmeal (FM) on-board seagoing Norwegian trawlers. The aim of this study was to document the properties of whitefish FM (WFM) protein with respect to, physicochemical and bioactive properties. Analysis of the proximate composition of representative seasonal WFM batches show that the production is robust without much variance. The mean protein (61.9 ± 1.2), fat (8.9 ± 1.1%), moisture (5 ± 1.2%) and ash content (22.4 ± 0.8%), reflect the use of lean and bony raw-material...
July 2017: Heliyon
https://www.readbyqxmd.com/read/28720735/a-nonredundant-phosphopantetheinyl-transferase-ppta-is-a-novel-antifungal-target-that-directs-secondary-metabolite-siderophore-and-lysine-biosynthesis-in-aspergillus-fumigatus-and-is-critical-for-pathogenicity
#4
Anna Johns, Daniel H Scharf, Fabio Gsaller, Hella Schmidt, Thorsten Heinekamp, Maria Straßburger, Jason D Oliver, Mike Birch, Nicola Beckmann, Katharine S Dobb, Jane Gilsenan, Bharatkumar Rash, Elaine Bignell, Axel A Brakhage, Michael J Bromley
Secondary metabolites are key mediators of virulence for many pathogens. Aspergillus fumigatus produces a vast array of these bioactive molecules, the biosynthesis of which is catalyzed by nonribosomal peptide synthetases (NRPSs) or polyketide synthases (PKSs). Both NRPSs and PKSs harbor carrier domains that are primed for acceptance of secondary metabolic building blocks by a phosphopantetheinyl transferase (P-pant). The A. fumigatus P-pant PptA has been shown to prime the putative NRPS Pes1 in vitro and has an independent role in lysine biosynthesis; however, its role in global secondary metabolism and its impact on virulence has not been described...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28719744/high-resolution-insights-into-the-stepwise-self-assembly-of-nanofiber-from-bioactive-peptides
#5
Fude Sun, Long Chen, Xiufang Ding, Lida Xu, Xirui Zhou, Peng Wei, Jun-Feng Liang, Shi-Zhong Luo
Peptide self-assembly has a profound biological significance since self-assembled bioactive peptides are gifted with improved bioactivity as well as life-span. In this study, peptide self-assembly was investigated using a therapeutic peptide, PTP-7S (EENFLGALFKALSKLL). Combining experiments of atomic force microscopy (AFM), circular dichroism (CD) and 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence spectra, PTP-7S showing α-helix was found self-assembling into nanofibers in solution. Relying on the coarse-grained (CG) dynamic simulations, the self-assembling of PTP-7S was revealed as a stepwise process that peptide monomers first clustered into peptide-assembling units (PUs) with charged surface, and then the PUs integrated together to construct nano-fibril aggregates...
July 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28719212/proteochemometrics-based-prediction-of-peptide-binding-to-hla-dp-proteins
#6
Ventsislav Yordanov, Ivan Dimitrov, Irini Doytchinova
Human leukocyte antigens (HLA) class II proteins are involved in the antigen processing in the antigen presenting cells. They form complexes with antigen peptide fragments. The peptide-HLA protein complexes are presented on the cell surface where they are recognized by helper T cells (Th cells). HLA-DP is one of the three HLA class II loci. The HLA-DP proteins are associated with a significant number of autoimmune diseases, as well as with a susceptibility or resistance to a number of infectious agents. In the present study, we apply proteochemometrics - a method for bioactivity modeling of multiple ligands binding to multiple target proteins - to derive and validate a robust model for peptide binding prediction to 7 most frequent HLA-DP proteins...
July 18, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28718014/protein-hydrolysate-from-canned-sardine-and-brewing-by-products-improves-tnf-%C3%AE-induced-inflammation-in-an-intestinal-endothelial-co-culture-cell-model
#7
Elsa F Vieira, John Van Camp, Isabel M P L V O Ferreira, Charlotte Grootaert
PURPOSE: The anti-inflammatory activity of sardine protein hydrolysates (SPH) obtained by hydrolysis with proteases from brewing yeast surplus was ascertained. METHODS: For this purpose, a digested and desalted SPH fraction with molecular weight lower than 10 kDa was investigated using an endothelial cell line (EA.hy926) as such and in a co-culture model with an intestinal cell line (Caco-2). Effects of SPH <10 kDa on nitric oxide (NO) production, reactive oxygen species (ROS) inhibition and secretion of monocyte chemoattractant protein 1 (MCP-1), vascular endothelial growth factor (VEGF), chemokine IL-8 (IL-8) and intercellular adhesion molecule-1 (ICAM-1) were evaluated in TNF-α-treated and untreated cells...
July 17, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28714883/nmr-insights-into-the-structure-function-relationships-in-the-binding-of-melanocortin-analogues-to-the-mc1r-receptor
#8
Maurício Morais, Héctor Zamora-Carreras, Paula D Raposinho, Maria Cristina Oliveira, David Pantoja-Uceda, João D G Correia, M Angeles Jiménez
Linear and cyclic analogues of the α-melanocyte stimulating hormone (α-MSH) targeting the human melanocortin receptor 1 (MC1R) are of pharmacological interest for detecting and treating melanoma. The central sequence of α-MSH (His-Phe-Arg-Trp) has been identified as being essential for receptor binding. To deepen current knowledge on the molecular basis for α-MSH bioactivity, we aimed to understand the effect of cycle size on receptor binding. To that end, we synthesised two macrocyclic isomeric α-MSH analogues, c[NH-NO₂-C₆H₃-CO-His-DPhe-Arg-Trp-Lys]-Lys-NH₂ (CycN-K6) and c[NH-NO₂-C₆H₃-CO-His-DPhe-Arg-Trp-Lys-Lys]-NH₂ (CycN-K7)...
July 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28714176/osteogenic-differentiation-of-3d-cultured-mesenchymal-stem-cells-induced-by-bioactive-peptides
#9
Vera Lukasova, Matej Buzgo, Vera Sovkova, Jana Dankova, Michala Rampichova, Evzen Amler
OBJECTIVES: Bioactive peptides derived from receptor binding motifs of native proteins are a potent source of bioactive molecules that can induce signalling pathways. These peptides could substitute for osteogenesis promoting supplements. The work presented here compares three kinds of bioactive peptides derived from collagen III, bone morphogenetic protein 7 (BMP-7) and BMP-2 with their potential osteogenic activity on the model of porcine mesenchymal stem cells (pMSCs). MATERIALS AND METHODS: pMSCs were cultured on electrospun polycaprolactone nanofibrous scaffolds with different concentrations of the bioactive peptides without addition of any osteogenic supplement...
August 2017: Cell Proliferation
https://www.readbyqxmd.com/read/28714016/elastin%C3%A2-derived-peptides-are-involved-in-the-processes-of-human-temporomandibular-disorder-by-inducing-inflammatory-responses-in-synovial-cells
#10
Kazuhiko Kobayashi, Rei Jokaji, Mayuko Miyazawa-Hira, Shigeyuki Takatsuka, Akira Tanaka, Kazuhiro Ooi, Hiroyuki Nakamura, Shuichi Kawashiri
Temporomandibular joint dysfunction (TMD) is a collection of clinical symptoms that involve masticatory muscles and the temporomandibular joint (TMJ). Common symptoms include limited jaw motion and joint sound/pain, along with TMJ disc displacement. TMD is frequently associated with synovitis, a chronic inflammation of the synovium. Fibroblast‑like synovial cells have been identified to produce several inflammatory mediators and may have an important role in the progression of TMJ inflammation. Degradation of the extracellular matrix molecule elastin may lead to the release of bioactive peptides...
July 15, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28711732/high-level-expression-and-purification-of-a-mollusca-endoglucanase-from-ampullaria-crossean-in-pichia-pastoris
#11
Xiuping Su, Xinwei Geng, Meixian Fu, Yeqing Wu, Longfei Yin, Fukun Zhao, Wei Chen
EG27I is an endogenous glucanase belonging to glycoside hydrolase family (GHF) 45 from the Mollusca, Ampullaria crossean. In this study, the EG27I mature peptide gene fused to HFBII secretion signal of Trichoderma reesei was expressed under GAP promoter of Pichia pastoris in SMD1163 strain. Bioactive EG27I with a molecular weight of 27 kDa was successfully expressed and secreted into the culture medium. When high cell density fermentation of the recombinant Pichia pastoris was performed by a fed-batch strategy for totally 132 h in a 7...
July 12, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28711730/purification-and-characterization-of-a-long-acting-ciliary-neurotrophic-factor-via-genetically-fused-with-an-albumin-binding-domain
#12
Longfu Xu, Chun Zhang, Liping Liu, Yao Zhang, Qi Wang, Jian Wang, Yongdong Liu, Zhiguo Su
Ciliary neurotrophic factor (CNTF) is a promising candidate for the treatment of neurodegenerative or metabolic diseases, but suffers rapid clearance in body. Herein we constructed a new long-acting recombinant human CNTF (rhCNTF) by genetic fusion with an albumin-binding domain (ABD) through a flexible peptide linker, hoping to endow the new molecule prolonged serum circulation time by binding with endogenous human serum albumin (HSA) and then utilizing the naturally long-half-life property of HSA. This fused protein rhCNTF-ABD was expressed in Escherichia coli mainly in the soluble form and purified through a two-step chromatography, with purity of 95% and a high yield of 90-100 mg/L culture...
July 12, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28708310/omics-prediction-of-bioactive-peptides-from-the-edible-cyanobacterium-arthrospira-platensis-proteome
#13
Chaofan Ji, Jing Han, Jingbo Zhang, Jing Hu, Yinghuan Fu, Hang Qi, Yue Sun, Chenxu Yu
BACKGROUND: Bioinformatics approaches are widely used to evaluate the prospects of the novel protein sources in bioactive peptide research. The edible cyanobacteria are considered as the potential protein precursors. However, the abundance of unicellular cyanobacterial proteins is largely unknown and highly dynamic according to the cultivation conditions, which need to be considered in this research field. The objective of this work was to evaluate the protein abundance of Arthrospira platensis, as well as to map the bioactive peptide sequences from the high abundance proteins of the A...
July 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28707727/in-vitro-renin-angiotensin-system-inhibition-and-in-vivo-antihypertensive-activity-of-peptide-fractions-from-lima-bean-phaseolus-lunatus-l
#14
Norma A Ciau-Solís, Juan J Acevedo-Fernández, David Betancur-Ancona
BACKGROUND: The renin-angiotensin system is key in the physiopathology of arterial hypertension because it converts angiotensin I, via angiotensin I-converting enzyme (ACE), into angiotensin II. In vitro analyses were done of the ACE-inhibitory and renin-inhibitory activities of peptide fractions isolated by enzymatic hydrolysis of Lima bean (Phaseolus lunatus) protein. Antihypertensive activity was confirmed in vivo using a rat model. RESULTS: Lima bean protein was hydrolyzed with one of two sequential enzymatic systems (pepsin-pancreatin or Alcalase®-Flavourzyme®)...
July 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28707573/synthesis-radiosynthesis-and-metabolism-of-131i-y-c-cgrraggsc
#15
Jilai Xie, Donghui Pan, Mudan Lu, Xuan Chen, Yu Chen, Ting Zhang, Yan Xie, Huan Zhou, Lu Liu, Min Yang, Jiajun Wang, Daozhen Chen
BACKGROUND: The formation of the complex interleukin-11(IL-11) and IL-11 receptor (IL-11R) is closely related with tumor progression. Binding of IL-11 to the IL-11 receptor α-chain (IL-11Rα) has been suggested as a target for human cancer. The cyclic peptide c(CGRRAGGSC) is a mimic of IL-11. OBJECTIVE: To explore 131I-Y-c(CGRRAGGSC) synthesis and radiosynthesis, and metabolism in SKOV3 tumor-bearing mice. METHOD: In this study, 131I labeled c(CGRRAGGSC) was designed and characterized...
July 13, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28705433/recent-advances-in-racemic-protein-crystallography
#16
REVIEW
Bingjia Yan, Linzhi Ye, Weiliang Xu, Lei Liu
Solution of the three-dimensional structures of proteins is a critical step in deciphering the molecular mechanisms of their bioactivities. Among the many approaches for obtaining protein crystals, racemic protein crystallography has been developed as a unique method to solve the structures of an increasing number of proteins. Exploiting unnatural protein enantiomers in crystallization and resolution, racemic protein crystallography manifests two major advantages that are 1) to increase the success rate of protein crystallization, and 2) to obviate the phase problem in X-ray diffraction...
May 10, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28702643/antioxidant-ace-inhibitory-and-antimicrobial-activity-of-fermented-goat-milk-activity-and-physicochemical-property-relationship-of-the-peptide-components
#17
Miriam Moreno-Montoro, Manuel Olalla-Herrera, José Ángel Rufián-Henares, Rafael Giménez Martínez, Beatriz Miralles, Triana Bergillos, Miguel Navarro-Alarcón, Paula Jauregi
Increasing evidence on goat milk and the health benefits of its derived products beyond its nutritional value show its potential as a functional food. In this study, goat milk fractions were tested for their total antioxidant capacity using different methods (ORAC, ABTS, DPPH and FRAP), as well as their angiotensin-I-converting-enzyme inhibitory and antimicrobial (against Escherichia coli and Micrococcus luteus) activities. Different whey fractions (whey, cation exchange membrane permeate P and retentate R) of two fermented skimmed goat milks (ultrafiltered goat milk fermented with the classical starter bacteria or with the classical starter plus the Lactobacillus plantarum C4 probiotic strain) were assessed...
July 13, 2017: Food & Function
https://www.readbyqxmd.com/read/28701955/therapeutic-properties-of-bioactive-compounds-from-different-honeybee-products
#18
REVIEW
Laura Cornara, Marco Biagi, Jianbo Xiao, Bruno Burlando
Honeybees produce honey, royal jelly, propolis, bee venom, bee pollen, and beeswax, which potentially benefit to humans due to the bioactives in them. Clinical standardization of these products is hindered by chemical variability depending on honeybee and botanical sources, but different molecules have been isolated and pharmacologically characterized. Major honey bioactives include phenolics, methylglyoxal, royal jelly proteins (MRJPs), and oligosaccharides. In royal jelly there are antimicrobial jelleins and royalisin peptides, MRJPs, and hydroxy-decenoic acid derivatives, notably 10-hydroxy-2-decenoic acid (10-HDA), with antimicrobial, anti-inflammatory, immunomodulatory, neuromodulatory, metabolic syndrome preventing, and anti-aging activities...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28699496/up-scaling-strategies-to-improve-the-industrial-production-of-bacitracin-at-largescale
#19
Chandra Kant Sharma, Monika Sharma
Bacitracin was discovered and named after a 7 year old American girl, Margaret Tracey in 1943 as Bacillus was isolated from her wounds. Bacillus licheniformis is usually present in soil and bird feathers. This bacterium is most commonly present around back plumage and chest of birds. There are different types of bacitracin but the one most potent is Bacitracin A. Bacitracin induced proteins are localized in bacterial membrane. Production of antibiotic initially stopped, resumed by induction of bacitracin induced protein but after few mitotic divisions microbes reverted to their vulnerable state...
July 11, 2017: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/28698452/therapeutic-delivery-of-butyrylcholinesterase-by-brain-wide-viral-gene-transfer-to-mice
#20
Yang Gao, Liyi Geng, Vicky Ping Chen, Stephen Brimijoin
Recent research shows that butyrylcholinesterase (BChE) is not simply a liver enzyme that detoxifies bioactive esters in food and medications. In fact, in pursuing other goals, we recently found that it has an equally important role in regulating the peptide hormone ghrelin and its impact on hunger, obesity, and emotions. Here, we present and examine means of manipulating brain BChE levels by viral gene transfer, either regionally or globally, to modulate ghrelin signaling for long-term therapeutic purposes and to set the stage for exploring the neurophysiological impact of such an intervention...
July 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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