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https://www.readbyqxmd.com/read/28645873/generation-of-nitric-oxide-by-olive-olea-europaea-l-pollen-during-in-vitro-germination-and-assessment-of-the-s-nitroso-and-nitro-pollen-proteomes-by-computational-predictive-methods
#1
María José Jimenez-Quesada, Rosario Carmona, Elena Lima-Cabello, José Ángel Traverso, Antonio Jesús Castro, M Gonzalo Claros, Juan de Dios Alché
Nitric oxide is recognized as a signaling molecule involved in a broad range of physiological processes in plants including sexual reproduction. NO has been detected in the pollen grain at high levels and regulates pollen tube growth. Previous studies demonstrated that NO as well as ROS are produced in the olive reproductive tissues in a stage- and tissue-specific manner. The aim of this study was to assess the production of NO throughout the germination of olive (Olea europaea L.) pollen in vitro. The NO fluorescent probe DAF-2DA was used to image NO production in situ, which was correlated to pollen viability...
June 20, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28644609/galnac-tyrosine-is-a-ligand-of-plant-lectins-antibodies-and-human-and-murine-macrophage-galactose-type-lectins
#2
Ruslan Gibadullin, David Wayne Farnsworth, Joseph J Barchi, Jeffrey C Gildersleeve
In 2011, a new type of protein O-glycosylation was discovered in which N-acetylgalactosamine is attached to the side chain of tyrosine (GalNAc-Tyr). While present on dozens of proteins, the biological roles of GalNAc-Tyr are unknown. To gain insight into this new type of modification, we synthesized a group of GalNAc-Tyr glycopeptides, constructed microarrays, and evaluated potential recognition of GalNAc-Tyr by a series of glycan-binding proteins. Through a series of >150 microarray experiments, we assessed binding properties of a variety of plant lectins, monoclonal antibodies, and endogenous lectins...
June 23, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28644401/the-investigation-of-electrochemistry-behaviors-of-tyrosinase-based-on-directly-electrodeposited-grapheneon-choline-gold-nanoparticles
#3
Yaping He, Xiaohui Yang, Quan Han, Jianbin Zheng
A novel catechol (CA) biosensor was developed by embedding tyrosinase (Tyr) onto in situ electrochemical reduction graphene (EGR) on choline-functionalized gold nanoparticle (AuNPs-Ch) film. The results of UV-Vis spectra indicated that Tyr retained its original structure in the film, and an electrochemical investigation of the biosensor showed a pair of well-defined, quasi-reversible redox peaks with Epa = -0.0744 V and Epc = -0.114 V (vs. SCE) in 0.1 M, pH 7.0 sodium phosphate-buffered saline at a scan rate of 100 mV/s...
June 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28643348/the-construction-of-a-panel-of-serum-amino-acids-for-the-identification-of-early-chronic-kidney-disease-patients
#4
Rui Li, Jinna Dai, Hui Kang
BACKGROUND: Serum creatinine, urea, and cystatin-c are standardly used for the evaluation of renal function in the clinic. However, some patients have chronic kidney disease but still retain kidney function; a conventional serum index in these patients can be completely normal. Serum amino acid levels can reflect subtle changes in metabolism and are closely related to renal function. Here, we investigated how amino acids change as renal impairment increases. METHODS: Subjects were divided into three groups by renal function glomerular filtration rate: healthy controls, patients with chronic kidney disease with normal kidney function, and patients with chronic kidney disease with decreased kidney function group...
June 23, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28642245/a-reporter-mouse-model-for-in-vivo-tracing-and-in-vitro-molecular-studies-of-melanocytic-lineage-cells-and-their-diseases
#5
Melissa Crawford, Valerie Leclerc, Lina Dagnino
Alterations in melanocytic lineage cells give rise to a plethora of distinct human diseases, including neurocristopathies, cutaneous pigmentation disorders, loss of vision and hearing, as well as melanoma. Understanding the ontogeny and biology of melanocytic cells, as well as how they interact with their surrounding environment, are key steps in the development of therapies for diseases that involve this cell lineage. Efforts to culture and characterize primary melanocytes from normal or genetically engineered mouse models have at times yielded contrasting observations...
June 22, 2017: Biology Open
https://www.readbyqxmd.com/read/28640309/computational-analysis-of-histidine-mutations-on-the-structural-stability-of-human-tyrosinases-leading-to-albinism-insurgence
#6
Mubashir Hassan, Qamar Abbas, Hussain Raza, Ahmed A Moustafa, Sung-Yum Seo
Misfolding and structural alteration in proteins lead to serious malfunctions and cause various diseases in humans. Mutations at the active binding site in tyrosinase impair structural stability and cause lethal albinism by abolishing copper binding. To evaluate the histidine mutational effect, all mutated structures were built using homology modelling. The protein sequence was retrieved from the UniProt database, and 3D models of original and mutated human tyrosinase sequences were predicted by changing the residual positions within the target sequence separately...
June 22, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28637841/protein-tyrosine-phosphatase-%C3%AE-mediates-the-sema3a-induced-cortical-basal-dendritic-arborization-through-the-activation-of-fyn-tyrosine-kinase
#7
Fumio Nakamura, Takako Okada, Maria Shishikura, Noriko Uetani, Masahiko Taniguchi, Takeshi Yagi, Yoichiro Iwakura, Toshio Ohshima, Yoshio Goshima, Stephen M Strittmatter
Leukocyte common antigen related (LAR) class protein tyrosine phosphatases (PTPs) are critical for axonal guidance; however, their relation to specific guidance cues is poorly defined. We here show that PTP-3, LAR homologue in C. elegans, is involved in axon guidance regulated by Sema2A-signaling. PTPδ, one of vertebrate LAR class PTPs, participates in Sema3A-induced growth cone collapse response of primary cultured dorsal root ganglion neurons from M. musculus embryos. In vivo, however, the contribution of PTPδ in Sema3A-regualted axon guidance was minimal...
June 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28636973/amide-to-triazole-switch-vs-in-vivo-nep-inhibition-approaches-to-promote-radiopeptide-targeting-of-grpr-positive-tumors
#8
Theodosia Maina, Aikaterini Kaloudi, Ibai E Valverde, Thomas L Mindt, Berthold A Nock
INTRODUCTION: Radiolabeled bombesin (BBN)-analogs have been proposed for diagnosis and therapy of gastrin-releasing peptide receptor (GRPR)-expressing tumors, such as prostate, breast and lung cancer. Metabolic stability represents a crucial factor for the success of this approach by ensuring sufficient delivery of circulating radioligand to tumor sites. The amide-to-triazole switch on the backbone of DOTA-PEG4-[Nle(14)]BBN(7-14) (1) was reported to improve the in vitro stability of resulting (177)Lu-radioligands...
June 10, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28633399/the-interfacial-character-of-antibody-paratopes-analysis-of-antibody-antigen-structures
#9
Minh N Nguyen, Mohan R Pradhan, Chandra Verma, Pingyu Zhong
Summary: In this study, computational methods are applied to investigate the general properties of antigen engaging residues of a paratope from a non-redundant dataset of 403 antibody-antigen complexes to dissect the contribution of hydrogen bonds, hydrophobic, van der Waals contacts and ionic interactions, as well as role of water molecules in the antigen-antibody interface. Consistent with previous reports using smaller datasets, we found that Tyr, Trp, Ser, Asn, Asp, Thr, Arg, Gly, His contribute substantially to the interactions between antibody and antigen...
June 15, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28632179/the-antiproliferative-effect-of-cyclodipeptides-from-pseudomonas-aeruginosa-pao1-on-hela-cells-involves-inhibition-of-phosphorylation-of-akt-and-s6k-kinases
#10
Laura Hernández-Padilla, Dolores Vázquez-Rivera, Luis A Sánchez-Briones, Alma L Díaz-Pérez, José Moreno-Rodríguez, Mario A Moreno-Eutimio, Victor Meza-Carmen, Homero Reyes-De la Cruz, Jesús Campos-García
Pseudomonas aeruginosa PAO1, a potential pathogen of plants and animals, produces the cyclodipeptides cyclo(l-Pro-l-Tyr), cyclo(l-Pro-l-Phe), and cyclo(l-Pro-l-Val) (PAO1-CDPs), whose effects have been implicated in inhibition of human tumor cell line proliferation. Our purpose was to investigate in depth in the mechanisms of HeLa cell proliferation inhibition by the PAO1-CDPs. The results indicate that PAO1-CDPs, both purified individually and in mixtures, inhibited HeLa cell proliferation by arresting the cell cycle at the G0-G1 transition...
June 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28630069/degradation-of-incretins-and-modulation-of-blood-glucose-levels-by-periodontopathic-bacterial-dipeptidyl-peptidase-4
#11
Yuko Ohara-Nemoto, Manami Nakasato, Yu Shimoyama, Tomomi T Baba, Takeshi Kobayakawa, Toshio Ono, Takashi Yaegashi, Shigenobu Kimura, Takayuki K Nemoto
Severe periodontitis is known to aggravate diabetes mellitus, though molecular events related to that link have not been fully elucidated. Porphyromonas gingivalis, a major pathogen of periodontitis, expresses dipeptidyl peptidase 4 (DPP4), which is involved in regulation of blood glucose levels by cleaving incretins in humans. We examined the enzymatic characteristics of DPP4 from P. gingivalis as well as two other periodontopathic bacteria, Tannerella forsythia and Prevotella intermedia, and determined whether it is capable of regulating blood glucose levels...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28629449/delineating-the-genetic-heterogeneity-of-oca-in-hungarian-patients
#12
Beáta Fábos, Katalin Farkas, Lola Tóth, Adrienn Sulák, Kornélia Tripolszki, Mariann Tihanyi, Réka Németh, Krisztina Vas, Zsanett Csoma, Lajos Kemény, Márta Széll, Nikoletta Nagy
BACKGROUND: Oculocutaneous albinism (OCA) is a clinically and genetically heterogenic group of pigmentation abnormalities characterized by variable hair, skin, and ocular hypopigmentation. Six known genes and a locus on human chromosome 4q24 have been implicated in the etiology of isolated OCA forms (OCA 1-7). METHODS: The most frequent OCA types among Caucasians are OCA1, OCA2, and OCA4. We aimed to investigate genes responsible for the development of these OCA forms in Hungarian OCA patients (n = 13)...
June 19, 2017: European Journal of Medical Research
https://www.readbyqxmd.com/read/28627122/a-biotinylated-peptide-bp21-as-a-novel-potent-anti-anaphylactic-agent-targeting-platelet-activating-factor
#13
Akira Sato, Keiichi Ebina
Platelet-activating factor (PAF) is an important mediator of anaphylaxis and is therefore an anti-anaphylactic drug target. We recently reported that synthetic N-terminally biotinylated peptides (BP4-BP29) inhibit PAF by directly interacting with PAF and its metabolite/precursor lyso-PAF. In this study, we investigated whether the biotinylated peptides can inhibit anaphylactic reactions in vivo. In mouse models of anaphylaxis, one of the peptides, BP21, markedly and dose-dependently inhibited hypothermia with a maximum dose-response within 30 min after administration, even at doses 20 times lesser than doses of the known PAF antagonist CV-3988...
June 19, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28625362/urotensin-core-mimics-that-modulate-the-biological-activity-of-urotensin-ii-related-peptide-but-not-urotensin-ii
#14
Martin Strack, Étienne Billard, David Chatenet, William D Lubell
A novel approach for the synthesis of head-to-tail cyclic peptides has been developed and used to prepare two mimics of the urotensin II-related peptide (URP) cyclic core. Mimics 1 and 2 (c[Trp-Lys-Tyr-Gly-ψ(triazole)-Gly] and c[Phe-Trp-Lys-Tyr-Gly-ψ(triazole)-Gly]) were respectively prepared using a combination of solid- and solution-phase synthesis. The silyl-based alkyne-modifying (SAM) linker enabled installation of C-terminal alkyne and N-terminal azide moieties onto linear peptide precursors, which underwent head-to-tail copper-catalyzed azide-alkyne cycloaddition (CuAAC) in solution...
May 31, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28623131/fgf21-regulates-melanogenesis-in-alpaca-melanocytes-via-erk1-2-mediated-mitf-downregulation
#15
Ruiwei Wang, Tianzhi Chen, Bingling Zhao, Ruiwen Fan, Kaiyuan Ji, Xiuju Yu, Xianjun Wang, Changsheng Dong
Fibroblast growth factor 21 (FGF21) is known as a metabolic regulator to regulate the metabolism of glucose and lipids. However, the underlying mechanism of FGF21 on melanin synthesis remains unknown. Therefore, the current study investigates the effect of FGF21 on melanogenesis in alpaca melanocytes. We transfected the FGF21 into alpaca melanocytes, then detected the melanin contents, protein and mRNA levels of pigmentation-related genes in order to determine the melanogenesis-regulating pathway of FGF21. The results showed that FGF21 overexpression suppressed melanogenesis and decreased the expression of the major target genes termed microphthalmia-associated transcription factor (MITF) and its downstream genes, including tyrosinase (TYR) and tyrosinase-related protein 2 (TRP2)...
June 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28622596/synthesis-of-novel-fenfuram-diarylether-hybrids-as-potent-succinate-dehydrogenase-inhibitors
#16
Hong Jin, Jingya Zhou, Tao Pu, Aigui Zhang, Xuheng Gao, Ke Tao, Taiping Hou
Twelve novel fenfuram-diarylether hybrids were designed, synthesized and characterized by (1)H NMR and MS. Their in vitro antifungal activities were evaluated against five phytopathogenic fungi by mycelial growth inhibition method. Most compounds showed significant antifungal effect on Rhizoctonia solani and Sclerotinia sclerotiorum. Compound 1c exhibited the most potent antifungal effect on R. solani with an EC50 value of 0.242mg/L, superior to the commercial fungicide boscalid (EC50=1.758mg/L) and the lead fungicide fenfuram (EC50=7...
June 6, 2017: Bioorganic Chemistry
https://www.readbyqxmd.com/read/28620397/metabolome-dynamics-of-smutted-sugarcane-reveals-mechanisms-involved-in-disease-progression-and-whip-emission
#17
Patricia D C Schaker, Leila P Peters, Thais R Cataldi, Carlos A Labate, Camila Caldana, Claudia B Monteiro-Vitorello
Sugarcane smut disease, caused by the biotrophic fungus Sporisorium scitamineum, is characterized by the development of a whip-like structure from the plant meristem. The disease causes negative effects on sucrose accumulation, fiber content and juice quality. The aim of this study was to exam whether the transcriptomic changes already described during the infection of sugarcane by S. scitamineum result in changes at the metabolomic level. To address this question, an analysis was conducted during the initial stage of the interaction and through disease progression in a susceptible sugarcane genotype...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28616146/infrared-spectroscopy-of-the-nitrogenase-mofe-protein-under-electrochemical-control-potential-triggered-co-binding
#18
P Paengnakorn, P A Ash, S Shaw, K Danyal, T Chen, D R Dean, L C Seefeldt, K A Vincent
We demonstrate electrochemical control of the nitrogenase MoFe protein, in the absence of Fe protein or ATP, using europium(iii/ii) polyaminocarboxylate complexes as electron transfer mediators. This allows the potential dependence of proton reduction and inhibitor (CO) binding to the active site FeMo-cofactor to be established. Reduction of protons to H2 is catalyzed by the wild type MoFe protein and β-98(Tyr→His) and β-99(Phe→His) variants of the MoFe protein at potentials more negative than -800 mV (vs...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28611792/structural-and-functional-insights-into-wrky3-and-wrky4-transcription-factors-to-unravel-the-wrky-dna-w-box-complex-interaction-in-tomato-solanum-lycopersicum-l-a-computational-approach
#19
Mohd Aamir, Vinay K Singh, Mukesh Meena, Ram S Upadhyay, Vijai K Gupta, Surendra Singh
The WRKY transcription factors (TFs), play crucial role in plant defense response against various abiotic and biotic stresses. The role of WRKY3 and WRKY4 genes in plant defense response against necrotrophic pathogens is well-reported. However, their functional annotation in tomato is largely unknown. In the present work, we have characterized the structural and functional attributes of the two identified tomato WRKY transcription factors, WRKY3 (SlWRKY3), and WRKY4 (SlWRKY4) using computational approaches...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28603613/solid-state-fermentation-of-corn-soybean-meal-mixed-feed-with-bacillus-subtilis-and-enterococcus-faecium-for-degrading-antinutritional-factors-and-enhancing-nutritional-value
#20
Changyou Shi, Yu Zhang, Zeqing Lu, Yizhen Wang
BACKGROUND: Corn and soybean meal (SBM) are two of the most common feed ingredients used in pig feeds. However, a variety of antinutritional factors (ANFs) present in corn and SBM can interfere with the bioavailability of nutrients and have negative health effects on the pigs. In the present study, two-stage fermentation using Bacillus subtilis followed by Enterococcus faecium was carried out to degrade ANFs and improve the nutritional quality of corn and SBM mixed feed. Furthermore, the microbial composition and in vitro nutrient digestibility of inoculated mixed feed were determined and compared those of the uninoculated controls...
2017: Journal of Animal Science and Biotechnology
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