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https://www.readbyqxmd.com/read/29782550/multiple-roles-of-core-protein-linker-in-hepatitis-b-virus-replication
#1
Kuancheng Liu, Laurie Luckenbaugh, Xiaojun Ning, Ji Xi, Jianming Hu
Hepatitis B virus (HBV) core protein (HBc) contains an N-terminal domain (NTD, assembly domain) and a C-terminal domain (CTD), which are linked by a flexible linker region. HBc plays multiple essential roles in viral replication, including capsid assembly, packaging of the viral pregenomic RNA (pgRNA) into nucleocapsids, viral reverse transcription that converts pgRNA to the genomic DNA, and secretion of DNA-containing (complete) virions or genome-free (empty) virions. The HBc linker is generally assumed to act merely as a spacer between NTD and CTD but some results suggest that the linker may affect NTD assembly...
May 21, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29780359/the-mitotic-and-metabolic-effects-of-phosphatidic-acid-in-the-primary-muscle-cells-of-turbot-scophthalmus-maximus
#2
Tingting Wang, Xuan Wang, Huihui Zhou, Haowen Jiang, Kangsen Mai, Gen He
Searching for nutraceuticals and understanding the underlying mechanism that promote fish growth is at high demand for aquaculture industry. In this study, the modulatory effects of soy phosphatidic acids (PA) on cell proliferation, nutrient sensing, and metabolic pathways were systematically examined in primary muscle cells of turbot ( Scophthalmus maximus ). PA was found to stimulate cell proliferation and promote G1/S phase transition through activation of target of rapamycin signaling pathway. The expression of myogenic regulatory factors, including myoD and follistatin , was upregulated, while that of myogenin and myostatin was downregulated by PA...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29769736/trna-tracking-for-direct-measurements-of-protein-synthesis-kinetics-in-live-cells
#3
Ivan L Volkov, Martin Lindén, Javier Aguirre Rivera, Ka-Weng Ieong, Mikhail Metelev, Johan Elf, Magnus Johansson
Our ability to directly relate results from test-tube biochemical experiments to the kinetics in living cells is very limited. Here we present experimental and analytical tools to directly study the kinetics of fast biochemical reactions in live cells. Dye-labeled molecules are electroporated into bacterial cells and tracked using super-resolved single-molecule microscopy. Trajectories are analyzed by machine-learning algorithms to directly monitor transitions between bound and free states. In particular, we measure the dwell time of tRNAs on ribosomes, and hence achieve direct measurements of translation rates inside living cells at codon resolution...
May 16, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29754223/synthetic-biology-with-an-all-e-coli-txtl-system-quantitative-characterization-of-regulatory-elements-and-gene-circuits
#4
Ryan Marshall, Vincent Noireaux
Over the past decade, a new generation of cell-free transcription-translation (TXTL) systems has been devised for emerging multidisciplinary applications. The DNA-dependent in vitro protein synthesis technology has been developed to tackle applications in synthetic biology, biological and chemical engineering, as well as quantitative disciplines such as biophysics. In addition to being convenient at the biosafety level, the new TXTL platforms are user-friendly; more affordable; more versatile at the level of transcription, with a TX repertoire covering hundreds of parts; and more powerful, with protein production reaching a few mg/mL in batch and continuous modes...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29752079/gemcitabine-loaded-gold-nanospheres-mediated-by-albumin-for-enhanced-anti-tumor-activity-combining-with-ct-imaging
#5
Zhiming Wang, Lina Chen, Zhongyun Chu, Chusen Huang, Yuankui Huang, Nengqin Jia
Currently, the development of a more effective therapy approach overcoming the resistance to chemotherapy for lung cancer still faces great challenges and requires further investigation. Herein, we fabricated gemcitabine (Gem) loaded gold nanospheres mediated by bovine serum albumin (Au@BSA) for the efficient delivery of therapeutic agents into the human pulmonary carcinoma cells (A549) and simultaneous computed tomography (CT) imaging. These nanoparticles (Au@BSA) with an approximate diameter of 10 nm were single crystals and prepared through a protein-directed facile one-pot synthesis via the reduction of chloroauric acid (HAuCl4 ) utilizing bovine serum albumin (BSA) as the stabilizer...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29748858/bench-scale-production-of-butyramide-using-free-and-immobilized-cells-of-bacillus-sp-apb-6
#6
Rajendra Singh, Deepak Pandey, Neena Devi, Duni Chand
Butyramide is a commodity chemical having wide range of applications from material science to biological sciences including synthesis of therapeutic drugs, hydroxamic acids, and electrorheological fluids. The nitrile hydratase protein of Bacillus sp. APB-6 was explored to develop an efficient biocatalytic process for the biotransformation of butyronitrile to butyramide using free and immobilized cells. The reaction conditions for nitrile hydratase activity were not affected after immobilization of the free cells and the optimum pH and temperature for both free and immobilized cells were 8...
May 10, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29748743/erythropoietin-and-nrf2-key-factors-in-the-neuroprotection-provided-by-apo-lactoferrin
#7
E T Zakharova, A V Sokolov, N N Pavlichenko, V A Kostevich, I N Abdurasulova, A V Chechushkov, I V Voynova, A Yu Elizarova, N N Kolmakov, M G Bass, I V Semak, A I Budevich, P M Kozhin, N K Zenkov, V M Klimenko, O V Kirik, D E Korzhevskii, E B Menshchikova, V B Vasilyev
Among the properties of lactoferrin (LF) are bactericidal, antianemic, immunomodulatory, antitumour, antiphlogistic effects. Previously we demonstrated its capacity to stabilize in vivo HIF-1-alpha and HIF-2-alpha, which are redox-sensitive multiaimed transcription factors. Various tissues of animals receiving recombinant human LF (rhLF) responded by expressing the HIF-1-alpha target genes, hence such proteins as erythropoietin (EPO), ceruloplasmin, etc. were synthesized in noticeable amounts. Among organs in which EPO synthesis occurred were brain, heart, spleen, liver, kidneys and lungs...
May 10, 2018: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29741393/molecular-docking-of-immunogenic-peptide-of-toxoplasma-gondii-and-encapsulation-with-polymer-as-vaccine-candidate
#8
Rabia Cakir-Koc, Yasemin Budama-Kilinc, Yagmur Kokcu, Serda Kecel-Gunduz
Toxoplasma gondii is one of the most widely spread parasitic organisms in the world. T. gondii causes primary, chronic infection and mortality. Major surface antigen 1 is the most abundant tachyzoite surface protein and highly conserved between species and causes strong humoural response. Some studies showed that the peptide sequence of surface antigen has immunity. Therefore, tachyzoite surface antigenic peptide sequence is one of the good candidates for vaccine development. However, conformational information and delivery systems are very important parameters for vaccine development...
May 9, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29740920/electro-oxidative-cross-s-h-s-h-coupling-with-hydrogen-evolution-a-facile-access-to-unsymmetrical-disulfides
#9
Aiwen Lei, Pengfei Huang, Pan Wang, Shan Tang, Zhuangjiong Fu
Sulfur is an essential element for all lives because it exists widely in proteins. Disulfide bond is an important moiety of many different types of significant organic molecules. A new approach for oxidant- and catalyst-free S-H/S-H cross-coupling with hydrogen evolution to construct unsymmetrical disulfide was developed. In the conditions of undivided cell and room temperature, a series of unsymmetrical disulfides were prepared with up to 87% yield from the direct coupling of aryl mercaptan and alkyl mercaptan...
May 8, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29736039/design-of-glycosylation-sites-by-rapid-synthesis-and-analysis-of-glycosyltransferases
#10
Weston Kightlinger, Liang Lin, Madisen Rosztoczy, Wenhao Li, Matthew P DeLisa, Milan Mrksich, Michael C Jewett
Glycosylation is an abundant post-translational modification that is important in disease and biotechnology. Current methods to understand and engineer glycosylation cannot sufficiently explore the vast experimental landscapes required to accurately predict and design glycosylation sites modified by glycosyltransferases. Here we describe a systematic platform for glycosylation sequence characterization and optimization by rapid expression and screening (GlycoSCORES), which combines cell-free protein synthesis and mass spectrometry of self-assembled monolayers...
May 7, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29730709/lysine-supplement-benefits-the-growth-performance-protein-synthesis-and-muscle-development-of-megalobrama-amblycephala-fed-diets-with-fish-meal-replaced-by-rice-protein-concentrate
#11
Wan-Cun Cai, Wen-Bin Liu, Guang-Zhen Jiang, Kai-Zhou Wang, Cun-Xin Sun, Xiang-Fei Li
This study aimed to investigate the effects of lysine supplement on the growth performance of blunt snout bream Megalobrama amblycephala fed diets with fish meal (FM) replaced by rice protein concentrate (RPC) with the potential mechanisms characterized. Fish were fed three diets, including the FM diet (containing FM), the RPC diet (FM replaced by RPC), and the MRPC diet (the RPC diet supplemented with lysine) for 8 weeks. Weight gain, protein efficiency ratio, and nitrogen and energy utilization of fish fed the FM diet were all significantly higher than those of the RPC treatment, but they showed no statistical difference with those of the MRPC group...
May 5, 2018: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/29730021/obesity-and-breast-cancer-in-premenopausal-women-current-evidence-and-future-perspectives
#12
Daniela Laudisio, Giovanna Muscogiuri, Luigi Barrea, Silvia Savastano, Annamaria Colao
There is raising evidence reporting an increased incidence of breast cancer over the past decades. Every year approximately 1.4 million new cases of breast cancer are diagnosed worldwide, with a mortality rate of approximately 450,000/year. Out of these cases, 6.6% are diagnosed in premenopausal women with a median age at diagnosis of 40 years: in premenopausal women breast cancer seems to be more aggressive than in post-menopausal women. Obesity has been reported to increase the risk of developing breast cancer and to worsen the prognosis...
March 27, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29724897/targeting-hsp90-dimerization-via-the-c-terminus-is-effective-in-imatinib-resistant-cml-and-lacks-heat-shock-response
#13
Sanil Bhatia, Daniela Diedrich, Benedikt Frieg, Heinz Ahlert, Stefan Stein, Bertan Bopp, Franziska Lang, Tao Zang, Tobias Kröger, Thomas Ernst, Gesine Kögler, Andreas Krieg, Steffen Lüdeke, Hana Kunkel, Ana J Rodrigues Moita, Matthias U Kassack, Viktoria Marquardt, Friederike V Opitz, Marina Oldenburg, Marc Remke, Florian Babor, Manuel Grez, Andreas Hochhaus, Arndt Borkhardt, Georg Groth, Luitgard Nagel-Steger, Joachim Jose, Thomas Kurz, Holger Gohlke, Finn K Hansen, Julia Hauer
Heat shock protein 90 (HSP90) stabilizes many client proteins including BCR-ABL1 oncoprotein. BCR-ABL1 is the hallmark of CML in which treatment-free remission (TFR) is limited with clinical and economic consequences. Thus, there is an urgent need for novel therapeutics, which synergize with current treatment approaches. Several inhibitors targeting the N-terminal domain (NTD) of HSP90 are under investigation; however, side effects such as induction of heat shock response (HSR) and toxicity have so far precluded their FDA approval...
May 3, 2018: Blood
https://www.readbyqxmd.com/read/29721586/corticosteroid-binding-globulin-induced-in-testicular-leydig-cells-by-perfluorooctanoic-acid-promotes-steroid-hormone-synthesis
#14
Sujie Sun, Jianshe Wang, Yin Lu, Jiayin Dai
Perfluorooctanoic acid (PFOA) is an abundant perfluoroalkyl substance widely applied in industrial and consumer products. It is a ubiquitous environmental pollutant and suspected endocrine disruptor. Corticosteroid-binding globulin (CBG) is a monomeric glycoprotein that can bind specifically to anti-inflammatory steroids, such as glucocorticoids and progesterone, in circulation. Our previous proteomic profile analysis revealed that CBG levels increased in testes after PFOA treatment. In the present study, we verified its increase in mouse testes following oral exposure to PFOA (0, 1...
May 2, 2018: Archives of Toxicology
https://www.readbyqxmd.com/read/29721531/extra-large-pore-mesoporous-silica-nanoparticles-enabling-co-delivery-of-high-amounts-of-protein-antigen-and-toll-like-receptor-9-agonist-for-enhanced-cancer-vaccine-efficacy
#15
Bong Geun Cha, Ji Hoon Jeong, Jaeyun Kim
Cancer vaccine aims to invoke antitumor adaptive immune responses to detect and eliminate tumors. However, the current dendritic cells (DCs)-based cancer vaccines have several limitations that are mostly derived from the ex vivo culture of patient DCs. To circumvent the limitations, direct activation and maturation of host DCs using antigen-carrying materials, without the need for isolation of DCs from patients, are required. In this study, we demonstrate the synthesis of extra-large pore mesoporous silica nanoparticles (XL-MSNs) and their use as a prophylactic cancer vaccine through the delivery of cancer antigen and danger signal to host DCs in the draining lymph nodes...
April 25, 2018: ACS Central Science
https://www.readbyqxmd.com/read/29713243/identification-of-four-differentially-methylated-genes-as-prognostic-signatures-for-stage-i-lung-adenocarcinoma
#16
Wei-Ming Luo, Zheng-Yu Wang, Xin Zhang
Background: Lung adenocarcinoma (LUAD) is the main subtype of non-small cell lung cancer with a low survival prognosis. We aimed to generate a prognostic model for the postoperative recurrence of LUAD. Methods: The methylated DNA data of LUAD patients were downloaded from the Cancer Genome Atlas (TCGA). The differentially methylated genes were identified and protein-protein interacting network was constructed, with which prognostic signature of this cancer was generated...
2018: Cancer Cell International
https://www.readbyqxmd.com/read/29688708/novel-allosteric-activators-for-ferroptosis-regulator-glutathione-peroxidase-4
#17
Cong Li, Xiaobing Deng, Weilin Zhang, Xiaowen Xie, Marcus Conrad, Ying Liu, José Pedro Friedmann Angeli, Luhua Lai
Glutathione peroxidase 4 (GPX4) is essential for cell membrane repair, inflammation suppression, and ferroptosis inhibition. GPX4 upregulation provides unique drug discovery opportunities for inflammation and ferroptosis-related diseases. However, rational design of protein activators is challenging. Until now, no compound has been reported to activate the enzyme activity of GPX4. Here, we identified a potential allosteric site in GPX4, and successfully found eight GPX4 activators using a novel computational strategy and experimental studies...
April 24, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29687201/folate-promotes-s-adenosyl-methionine-reactions-and-the-microbial-methylation-cycle-and-boosts-ruminants-production-and-reproduction
#18
REVIEW
Imtiaz Hussain Raja Abbasi, Farzana Abbasi, Lamei Wang, Mohamed E Abd El Hack, Ayman A Swelum, Ren Hao, Junhu Yao, Yangchun Cao
Folate has gained significant attention due to its vital role in biological methylation and epigenetic machinery. Folate, or vitamin (B9 ), is only produced through a de novo mechanism by plants and micro-organisms in the rumen of mature animals. Although limited research has been conducted on folate in ruminants, it has been noted that ruminal synthesis could not maintain folate levels in high yielding dairy animals. Folate has an essential role in one-carbon metabolism and is a strong antiproliferative agent...
April 23, 2018: AMB Express
https://www.readbyqxmd.com/read/29684682/identification-and-validation-nucleolin-as-a-target-of-curcumol-in-nasopharyngeal-carcinoma-cells
#19
Juan Wang, Jiacai Wu, Xumei Li, Haowei Liu, Jianli Qin, Zhun Bai, Bixia Chi, Chen Xu
Identification of the specific protein target(s) of a drug is a critical step in unraveling its mechanisms of action (MOA) in many natural products. Curcumol, isolated from well known Chinese medicinal plant Curcuma zedoary, has been shown to possess multiple biological activities. It can inhibit nasopharyngeal carcinoma (NPC) proliferation and induce apoptosis, but its target protein(s) in NPC cells remains unclear. In this study, we employed a mass spectrometry-based chemical proteomics approach reveal the possible protein targets of curcumol in NPC cells...
April 20, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29678103/ouantitative-proteomic-analysis-of-cellular-responses-to-a-designed-amino-acid-feed-in-a-monoclonal-antibody-producing-chinese-hamster-ovary-cell-line
#20
Fatemeh Torkashvand, Fereidoun Mahboudi, Manouchehr Vossoughi, Elnaz Fatemi, Seyed Masoud Moosavi Basri, Amir Heydari, Behrouz Vaziri
Background: Chinese hamster ovary (CHO) cell line is considered as the most common cell line in the biopharmaceutical industry because of its capability in performing efficient post-translational modifications and producing the recombinant proteins, which are similar to natural human proteins. The optimization of the upstream process via different feed strategies has a great impact on the target molecule expression and yield. Methods: To determine and understand the molecular events beneath the feed effects on the CHO cell, a label-free quantitative proteomic analysis was applied...
April 21, 2018: Iranian Biomedical Journal
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