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https://www.readbyqxmd.com/read/28107776/activity-based-probes-for-the-multicatalytic-proteasome
#1
REVIEW
David S Hewings, John A Flygare, Ingrid E Wertz, Matthew Bogyo
Proteasomes are multisubunit protease complexes responsible for degrading most intracellular proteins. In addition to removing damaged proteins, they regulate many important cellular processes through the controlled degradation of transcription factors, cell cycle regulators and enzymes. Eukaryotic proteasomes have three catalytic subunits, β1, β2 and β5, that each have different substrate specificities. Additionally, although we know that diverse cell types express proteasome variants with distinct activity and specificity profiles, the functions of these different pools of proteasomes are not fully understood...
January 20, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28107749/use-of-fluorescence-spectroscopy-to-control-ozone-dosage-in-recirculating-aquaculture-systems
#2
Aikaterini Spiliotopoulou, Richard Martin, Lars-Flemming Pedersen, Henrik R Andersen
The aim of this study was to investigate the potential of fluorescence spectroscopy to be used as an ozone dosage determination tool in recirculating aquaculture systems (RASs), by studying the relationship between fluorescence intensities and dissolved organic matter (DOM) degradation by ozone, in order to optimise ozonation treatment. Water samples from six different Danish facilities (two rearing units from a commercial trout RAS, a commercial eel RAS, a pilot RAS and two marine water aquariums) were treated with different O3 dosages (1...
December 24, 2016: Water Research
https://www.readbyqxmd.com/read/28107720/enhanced-treatment-performance-of-coking-wastewater-and-reduced-membrane-fouling-using-a-novel-embr
#3
Bei Jiang, Cong Du, Shengnan Shi, Liang Tan, Meidi Li, Jiaxin Liu, Lanlan Xue, Xiangyu Ji
A novel EMBR (electric field applied in MBR) by placing stainless steel mesh cathode inside a flat membrane module and stainless steel mesh anode outside the module was built and operated to enhance the treatment performance of coking wastewater containing phenol, pyridine and quinoline and reduce the membrane fouling. The degradation rates of COD, phenol, pyridine and quinoline in EMBR with electric field (reactor A) were significantly higher than the sum of EMBR without electric field (reactor B) and only electro-catalytic degradation during the long-term treatment, confirming that a coupling effect was existed between biodegradation and electro-catalytic degradation process...
January 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107715/metabolical-shifts-towards-alternative-btex-biodegradation-intermediates-induced-by-perfluorinated-compounds-in-firefighting-foams
#4
Renato Nallin Montagnolli, Paulo Renato Matos Lopes, Jaqueline Matos Cruz, Marina Turini Claro, Gabriela Mercuri Quiterio, Ederio Dino Bidoia
The type and concentration of perfluorinated compounds (PFCs) can induce different types of enzymes and promote alternate patterns of BTEX transformation. However, it is not known how the presence of active fluorocarbon-degrading microbial populations affects the transformation of BTEX. In addition to chemical analysis at the molecular level, our research approached the aqueous film forming fire-fighting foams (AFFF) and BTEX co-contamination at a large-scale with respirometers to quantify the total microbial metabolism of soil via CO2 output levels...
December 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/28107662/a-simple-and-powerful-co-delivery-system-based-on-ph-responsive-metal-organic-frameworks-for-enhanced-cancer-immunotherapy
#5
Fei Duan, Xiaochen Feng, Xinjian Yang, Wentong Sun, Yi Jin, Huifang Liu, Kun Ge, Zhenhua Li, Jinchao Zhang
Tumor-associated antigens (TAAs)-loaded nanoparticles are able to be actively internalized by antigen-presenting cells (APCs) and have shown promising potential in cancer immunotherapy. However, current TAAs delivery strategy exhibits limitations of complicated synthesis process, low loading efficiency and inefficient CD8(+) cytotoxic T lymphocyte activation leading to unsatisfactory therapeutic effect. Thus, the construction of novel TAAs-delivery systems for enhanced cancer therapy is highly desirable. In this work, we fabricated a very simple yet powerful antigens-delivery system for cancer immunotherapy based-on pH-responsive metal-organic frameworks (MOFs) with size about 30 nm...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28107533/improvement-of-therapeutic-efficacy-of-oral-immunotherapy-in-combination-with-regulatory-t-cell-inducer-kakkonto-in-a-murine-food-allergy-model
#6
Yuka Nagata, Takeshi Yamamoto, Michie Hayashi, Shusaku Hayashi, Makoto Kadowaki
Oral immunotherapy (OIT) has been considered a promising approach for food allergies (FAs). However, the current OIT strategy is limited in terms of the long-term efficacy and safety. We have previously demonstrated that kakkonto, a traditional Japanese herbal medicine, suppresses the occurrence of allergic symptoms in a murine model of ovalbumin (OVA)-induced FA, which is attributed to the induction of the Foxp3+ CD4+ regulatory T cells. In this study, we established an OIT model using the FA mice with already established allergic symptoms and determined whether kakkonto could improve the efficacy of OIT...
2017: PloS One
https://www.readbyqxmd.com/read/28107522/correction-novel-igg-degrading-enzymes-of-the-igde-protease-family-link-substrate-specificity-to-host-tropism-of-streptococcus-species
#7
Christian Spoerry, Pontus Hessle, Melanie J Lewis, Lois Paton, Jenny M Woof, Ulrich von Pawel-Rammingen
[This corrects the article DOI: 10.1371/journal.pone.0164809.].
2017: PloS One
https://www.readbyqxmd.com/read/28107521/differential-roles-of-axin1-and-axin2-in-tankyrase-inhibitor-induced-formation-of-degradasomes-and-%C3%AE-catenin-degradation
#8
Tor Espen Thorvaldsen, Nina Marie Pedersen, Eva Maria Wenzel, Harald Stenmark
Inhibition of the tankyrase enzymes (TNKS1 and TNKS2) has recently been shown to induce highly dynamic assemblies of β-catenin destruction complex components known as degradasomes, which promote degradation of β-catenin and reduced Wnt signaling activity in colorectal cancer cells. AXIN1 and AXIN2/Conductin, the rate-limiting factors for the stability and function of endogenous destruction complexes, are stabilized upon TNKS inhibition due to abrogated degradation of AXIN by the proteasome. Since the role of AXIN1 versus AXIN2 as scaffolding proteins in the Wnt signaling pathway still remains incompletely understood, we sought to elucidate their relative contribution in the formation of degradasomes, as these protein assemblies most likely represent the morphological and functional correlates of endogenous β-catenin destruction complexes...
2017: PloS One
https://www.readbyqxmd.com/read/28107376/deletion-of-ph-regulator-pac-3-affects-cellulase-and-xylanase-activity-during-sugarcane-bagasse-degradation-by-neurospora-crassa
#9
Amanda Cristina Campos Antoniêto, Wellington Ramos Pedersoli, Lílian Dos Santos Castro, Rodrigo da Silva Santos, Aline Helena da Silva Cruz, Karoline Maria Vieira Nogueira, Rafael Silva-Rocha, Antonio Rossi, Roberto Nascimento Silva
Microorganisms play a vital role in bioethanol production whose usage as fuel energy is increasing worldwide. The filamentous fungus Neurospora crassa synthesize and secrete the major enzymes involved in plant cell wall deconstruction. The production of cellulases and hemicellulases is known to be affected by the environmental pH; however, the regulatory mechanisms of this process are still poorly understood. In this study, we investigated the role of the pH regulator PAC-3 in N. crassa during their growth on sugarcane bagasse at different pH conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28107086/interaction-between-lipid-droplets-and-endoplasmic-reticulum-in-human-atherosclerotic-plaques
#10
Ida Perrotta
Lipid droplets (LDs) are intracellular organelles that are found in nearly all cell types, where they serve fundamental roles in lipid metabolism and energy homeostasis. Traditionally considered as simple lipid storage deposits, these dynamic and remarkable organelles have recently been implicated in a number of other cellular functions, ranging from protein storage and degradation to virus replication. Intracellular accumulation of LDs is also a hallmark feature of diverse human diseases including diabetes type II, obesity, hepatosteatosis, cancer, and atherosclerosis...
January 20, 2017: Ultrastructural Pathology
https://www.readbyqxmd.com/read/28107005/kinetic-analysis-and-mechanism-of-the-hydrolytic-degradation-of-squaramides-and-squaramic-acids
#11
Marta Ximenis, Emilio Bustelo, Andrés G Algarra, Manel Vega, Carmen Rotger, Manuel G Basallote, Antonio Costa
The hydrolytic degradation of squaramides and squaramic acids, the product of partial hydrolysis of squaramides, has been evaluated by UV spectroscopy at 37°C in the pH range 3-10. Under these conditions, the compounds are kinetically stable over long time periods (>100 d). At pH > 10, the hydrolysis of the squaramate anions shows first-order dependence on both squaramate and OH-. At the same temperature and [OH-], the hydrolysis of squaramides usually displays biphasic spectral changes (A → B → C kinetic model) with formation of squaramates as detectable reaction intermediates...
January 20, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28106994/enzymatic-halogenation-and-dehalogenation-reactions-pervasive-and-mechanistically-diverse
#12
Vinayak Agarwal, Zachary D Miles, Jaclyn M Winter, Alessandra S Eustáquio, Abrahim A El Gamal, Bradley S Moore
Naturally produced halogenated compounds are ubiquitous across all domains of life where they perform a multitude of biological functions and adopt a diversity of chemical structures. Accordingly, a diverse collection of enzyme catalysts to install and remove halogens from organic scaffolds has evolved in nature. Accounting for the different chemical properties of the four halogen atoms (fluorine, chlorine, bromine, and iodine) and the diversity and chemical reactivity of their organic substrates, enzymes performing biosynthetic and degradative halogenation chemistry utilize numerous mechanistic strategies involving oxidation, reduction, and substitution...
January 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28106980/structural-snapshots-of-an-engineered-cystathionine-%C3%AE-lyase-reveal-the-critical-role-of-electrostatic-interactions-in-the-active-site
#13
Wupeng Yan, Everett M Stone, Yan Jessie Zhang
Enzyme therapeutics that can degrade L-methionine (L-Met) are of great interest as numerous malignancies are exquisitely sensitive to L-Met depletion. To exhaust the pool of the methionine in human serum, we previously engineered an L-Met degrading enzyme based on the human cystathionine-γ-lyase scaffold (hCGL-NLV) in order to circumvent immunogenicity and stability issues observed in the preclinical application of bacterial derived methionine-γ-lyases (MGL). To gain further insights into structure/activity relationships governing the chemistry of the hCGL-NLV lead molecule, we undertook a biophysical characterization campaign that captured crystal structures (2...
January 20, 2017: Biochemistry
https://www.readbyqxmd.com/read/28106884/excess-reactive-oxygen-species-production-mediates-monoclonal-antibody-induced-human-embryonic-stem-cell-death-via-oncosis
#14
Ji Yun Zheng, Heng Liang Tan, Paul Thomas Matsudaira, Andre Choo
Antibody-mediated cell killing has significantly facilitated the elimination of undesired cells in therapeutic applications. Besides the well-known Fc-dependent mechanisms, pathways of antibody-induced apoptosis were also extensively studied. However, with fewer studies reporting the ability of antibodies to evoke an alternative form of programmed cell death, oncosis, the molecular mechanism of antibody-mediated oncosis remains underinvestigated. In this study, a monoclonal antibody (mAb), TAG-A1 (A1), was generated to selectively kill residual undifferentiated human embryonic stem cells (hESC) so as to prevent teratoma formation upon transplantation of hESC-derived products...
January 20, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28106854/the-effect-of-polyphenols-on-protein-degradation-pathways-implications-for-neuroprotection
#15
REVIEW
Parvana Hajieva
Human neurodegenerative diseases are accompanied by accumulation of heavily oxidized and aggregated proteins. However, the exact molecular reason is not fully elucidated yet. Insufficient cellular protein quality control is thought to play an important role in accumulating covalently oxidized misfolded proteins. Pharmacologically active polyphenols and their derivatives exhibit potential for preventive and therapeutic purposes against protein aggregation during neurodegeneration. Although these compounds act on various biochemical pathways, their role in stabilizing the protein degradation machinery at different stages may be an attractive therapeutical strategy to halt the accumulation of misfolded proteins...
January 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28106780/integrins-and-cell-metabolism-an-intimate-relationship-impacting-cancer
#16
REVIEW
Rehman Ata, Costin N Antonescu
Integrins are important regulators of cell survival, proliferation, adhesion and migration. Once activated, integrins establish a regulated link between the extracellular matrix and the cytoskeleton. Integrins have well-established functions in cancer, such as in controlling cell survival by engagement of many specific intracellular signaling pathways and in facilitating metastasis. Integrins and associated proteins are regulated by control of transcription, membrane traffic, and degradation, as well as by a number of post-translational modifications including glycosylation, allowing integrin function to be modulated to conform to various cellular needs and environmental conditions...
January 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106764/effective-alternating-direction-optimization-methods-for-sparsity-constrained-blind-image-deblurring
#17
Naixue Xiong, Ryan Wen Liu, Maohan Liang, Di Wu, Zhao Liu, Huisi Wu
Single-image blind deblurring for imaging sensors in the Internet of Things (IoT) is a challenging ill-conditioned inverse problem, which requires regularization techniques to stabilize the image restoration process. The purpose is to recover the underlying blur kernel and latent sharp image from only one blurred image. Under many degraded imaging conditions, the blur kernel could be considered not only spatially sparse, but also piecewise smooth with the support of a continuous curve. By taking advantage of the hybrid sparse properties of the blur kernel, a hybrid regularization method is proposed in this paper to robustly and accurately estimate the blur kernel...
January 18, 2017: Sensors
https://www.readbyqxmd.com/read/28106738/6-paradol-and-6-shogaol-the-pungent-compounds-of-ginger-promote-glucose-utilization-in-adipocytes-and-myotubes-and-6-paradol-reduces-blood-glucose-in-high-fat-diet-fed-mice
#18
Chien-Kei Wei, Yi-Hong Tsai, Michal Korinek, Pei-Hsuan Hung, Mohamed El-Shazly, Yuan-Bin Cheng, Yang-Chang Wu, Tusty-Jiuan Hsieh, Fang-Rong Chang
The anti-diabetic activity of ginger powder (Zingiber officinale) has been recently promoted, with the recommendation to be included as one of the dietary supplements for diabetic patients. However, previous studies presented different results, which may be caused by degradation and metabolic changes of ginger components, gingerols, shogaols and paradols. Therefore, we prepared 10 ginger active components, namely 6-, 8-, 10-paradols, 6-, 8-, 10-shogaols, 6-, 8-, 10-gingerols and zingerone, and evaluated their anti-hyperglycemic activity...
January 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106723/inhibition-of-autophagic-degradation-process-contributes-to-claudin-2-expression-increase-and-epithelial-tight-junction-dysfunction-in-tnf-%C3%AE-treated-cell-monolayers
#19
Cong Zhang, Junkai Yan, Yongtao Xiao, Yujie Shen, Jiazheng Wang, Wensong Ge, Yingwei Chen
Tight junction dysfunction plays a vital role in some chronic inflammatory diseases. Pro-inflammatory cytokines, especially tumor necrosis factor alpha (TNF-α), act as important factors in intestinal epithelial tight junction dysfunction during inflammatory conditions. Autophagy has also been shown to be crucial in tight junction function and claudin-2 expression, but whether autophagy has an effect on the change of claudin-2 expression and tight junction function induced by TNF-α is still unknown. To answer this question, we examined the expression of claudin-2 protein, transepithelial electrical resistance (TER), and permeability of cell monolayers, autophagy flux change, and lysosomal pH after TNF-α with or without PP242 treatment...
January 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106512/endoglucanase-and-xylanase-production-by-bacillus-sp-ar03-in-co-culture-glycosyl-hydrolases-by-bacillus-sp-ar03-in-co-culture
#20
Johan S Hero, José H Pisa, Nora I Perotti, Cintia M Romero, María A Martínez
The behaviour of three isolates retrieved from different cellulolytic consortia, Bacillus sp. AR03, Paenibacillus sp. AR247 and Achromobacter sp. AR476-2, were examined individually and as co-cultures in order evaluate their ability to produce extracellular cellulases and xylanases. Utilizing a peptone-based medium supplemented with carboxymethyl cellulose (CMC), an increase estimated of 1.30 and 1.50 times was obtained by the co-culture containing the strains AR03 and AR247, with respect to enzyme titles registered by their individual cultivation...
January 20, 2017: Preparative Biochemistry & Biotechnology
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