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FEBS Open Bio

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https://www.readbyqxmd.com/read/29435420/effect-of-curcumin-on-amyloid-like-aggregates-generated-from-methionine-oxidized-apolipoprotein-a-i
#1
Aparna Krishnamoorthy, Narjes Tavoosi, Gary K L Chan, Jianfang Liu, Gang Ren, Giorgio Cavigiolio, Robert O Ryan
Curcumin is a polyphenolic phytonutrient that has antineurodegenerative properties. In this study, we investigated the anti-amyloidogenic properties of curcumin. Following incubation with curcumin, intrinsic tryptophan fluorescence emission of apolipoprotein (apo) A-I was strongly quenched. At the same time, curcumin fluorescence emission was enhanced. The fluorescence emission spectra of curcumin in the presence of amyloid-like aggregates formed by methionine-oxidized (ox) apoA-I varied, depending on whether curcumin was added before, or after, aggregate formation...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435419/two-nonsense-somatic-mutations-in-men1-identified-in-sporadic-insulinomas
#2
Cheng Qi, Jiayue Duan, Qingfeng Shi, Mingguang Wang, Changqing Yan
Insulinomas are functional pancreatic neuroendocrine tumors that cause hypoglycemia and severe morbidity. The aim of our study was to identify gene mutations responsible for tumorigenesis of sporadic insulinoma. Whole exome sequencing analysis was performed on tumors and paired peripheral blood from three patients with insulinomas. After initial analysis, somatic mutations were obtained and a deleterious protein product was further predicted by various bioinformatic programs. Whole exome sequencing identified 55 rare somatic mutations among three insulinoma patients, including MEN1 gene nonsense mutations (c...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435418/identification-of-key-mirnas-and-genes-associated-with-stomach-adenocarcinoma-from-the-cancer-genome-atlas-database
#3
Jixi Liu, Fang Liu, Yanfen Shi, Huangying Tan, Lei Zhou
Stomach adenocarcinoma (STAD) is the second leading cause of cancer death and a fuller understanding of its molecular basis is needed to develop new therapeutic targets. miRNA and mRNA data were downloaded from The Cancer Genome Atlas database, and the differentially expressed miRNAs and genes were identified. The target genes of differentially expressed miRNAs were screened by prediction tools. Furthermore, the biological function of these target genes was investigated. Several key miRNAs and their target genes were selected for validation using quantitative real-time polymerase chain reaction (qRT-PCR)...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435417/tip60-is-associated-with-resistance-to-x-ray-irradiation-in-prostate-cancer
#4
Xin Xie, Zhaoping Xu, Chenghe Wang, Chen Fang, Juping Zhao, Le Xu, Xiaoqiang Qian, Jun Dai, Fukang Sun, Danfeng Xu, Wei He
Tip60, an oncogene, accelerates cell growth by regulating androgen receptor translocation into the nucleus in prostate cancer. However, the mechanism of Tip60 in the response of prostate cancer to radiotherapy, and radioresistance, has not been studied. Using human prostate cancer samples and two human prostate cancer cell lines (LNCaP and DU145), Tip60 protein expression and the acetylation of ataxia telangiectasia mutant (ATM) were analysed by western blotting and immunoprecipitation. Tip60 was downregulated with small interfering RNA...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435416/characterisation-of-an-aptamer-against-the-runt-domain-of-aml1-runx1-by-nmr-and-mutational-analyses
#5
Kenta Takada, Ryo Amano, Yusuke Nomura, Yoichiro Tanaka, Shigeru Sugiyama, Takashi Nagata, Masato Katahira, Yoshikazu Nakamura, Tomoko Kozu, Taiichi Sakamoto
Since the invention of systematic evolution of ligands by exponential enrichment, many short oligonucleotides (or aptamers) have been reported that can bind to a wide range of target molecules with high affinity and specificity. Previously, we reported an RNA aptamer that shows high affinity to the Runt domain (RD) of the AML1 protein, a transcription factor with roles in haematopoiesis and immune function. From kinetic and thermodynamic studies, it was suggested that the aptamer recognises a large surface area of the RD, using numerous weak interactions...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435415/the-postpartum-effect-of-maternal-diabetes-on-the-circulating-levels-of-sirtuins-and-superoxide-dismutase
#6
Samar Sultan, Nada Alzahrani, Kalthoom Al-Sakkaf
Gestational diabetes mellitus (GDM) is a glucose intolerance disorder which occurs during pregnancy as a result of insulin insensitivity; it usually disappears after delivery. However, some women with GDM can develop type 2 diabetes (T2D) after delivery, and the mechanisms by which this occurs remain unknown. This study compared the levels of sirtuins (NAD-dependent deacetylases) and antioxidative enzymes in postpartum women with previous GDM (pGDM) or T2D and in postpartum women with a previous healthy pregnancy (controls)...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435414/kinetic-analysis-of-the-isoleucyl-trna-synthetase-mechanism-the-next-reaction-cycle-can-start-before-the-previous-one-ends
#7
R Kalervo Airas
Aminoacyl-tRNA synthetases join correct amino acids to their cognate tRNA at the start of the protein synthesis. Through the kinetic analysis, it is possible to estimate how their functional details correspond to the known structural features. Kinetic analysis of the isoleucyl-tRNA synthetase (IleRS) from Escherichia coli was accomplished. Sixteen different steady-state two-ligand experiments were statistically analysed simultaneously so that the same rate equations and same rate and dissociation constants applied to all experiments...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435413/the-e3-ubiquitin-ligase-murf2-attenuates-lps-induced-macrophage-activation-by-inhibiting-production-of-inflammatory-cytokines-and-migration
#8
Hongjun Bian, Shanshan Gao, Di Zhang, Qi Zhao, Feifei Li, Xiao Li, Shuohuan Sun, Shouyang Song, Tao Li, Qiang Zhu, Wanhua Ren, Chengyong Qin, Jianni Qi
Muscle RING-finger (MuRF) proteins are E3 ubiquitin ligases that are expressed in striated muscle. MuRF2 is an important member of this family, but whether it is expressed in tissues other than striated muscle has not been thoroughly elucidated to date. In this study, we determined that MuRF2 is also expressed in other vital organs, including liver, lung, brain, spleen and kidney. Moreover, we show that the level of MuRF2 expression is significantly decreased in hepatic mononuclear cells of mice with lipopolysaccharide (LPS)/d-galactosamine-induced hepatitis and negatively correlated with the serum levels of alanine aminotransferase and aspartate aminotransferase in these mice...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435412/mirnaexpression-profile-of-retinal-pigment-epithelial-cells-under-oxidative-stress-conditions
#9
Luigi Donato, Placido Bramanti, Concetta Scimone, Carmela Rinaldi, Rosalia D'Angelo, Antonina Sidoti
Deep analysis of regulative mechanisms of transcription and translation in eukaryotes could improve knowledge of many genetic pathologies such as retinitis pigmentosa (RP). New layers of complexity have recently emerged with the discovery that 'junk' DNA is transcribed and, among these, miRNAs have assumed a preponderant role. We compared changes in the expression of miRNAs obtained from whole transcriptome analyses, between two groups of retinal pigment epithelium (RPE) cells, one untreated and the other exposed to the oxidant agent oxidized low-density lipoprotein (oxLDL), examining four time points (1, 2, 4 and 6 h)...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435411/ellagitannin-het-obtained-from-strawberry-leaves-is-oxidized-by-bacterial-membranes-and-inhibits-the-respiratory-chain
#10
Gustavo G Martos, Alicia Mamani, María P Filippone, Pedro O Abate, Néstor E Katz, Atilio P Castagnaro, Juan C Díaz Ricci
Plant secondary metabolism produces a variety of tannins that have a wide range of biological activities, including activation of plant defenses and antimicrobial, anti-inflammatory and antitumoral effects. The ellagitannin HeT (1- O -galloyl-2,3;4,6-bis-hexahydroxydiphenoyl-β-d-glucopyranose) from strawberry leaves elicits a strong plant defense response, and exhibits antimicrobial activity associated to the inhibition of the oxygen consumption, but its mechanism of action is unknown. In this paper we investigate the influence of HeT on bacterial cell membrane integrity and its effect on respiration...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435410/comparison-of-a-new-nanoform-of-the-photosensitizer-chlorin-e6-based-on-plant-phospholipids-with-its-free-form
#11
Lyubov V Kostryukova, Vladimir N Prozorovskiy, Natalya V Medvedeva, Olga M Ipatova
Photodynamic therapy is an advanced method of treating cancer and various benign diseases, including infections. It uses light-activated molecules [photosensitizers (PSs)] to generate reactive oxygen species (ROS) when irradiated with light of a specific wavelength. This study examined the photophysical and photosensitizing activity of the PS chlorin e6 incorporated in a delivery system based on plant phospholipids. This new nanoform of chlorin e6 comprised particles with a diameter of 18.4 ± 2.5 nm and zeta potential of -34...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435409/mir-204-5p-suppresses-hepatocellular-cancer-proliferation-by-regulating-homeoprotein-six1-expression
#12
Yi Chu, Mingzuo Jiang, Feng Du, Di Chen, Tao Ye, Bing Xu, Xiaowei Li, Weijie Wang, Zhaoyan Qiu, Haiming Liu, Yongzhan Nie, Jie Liang, Daiming Fan
Fewer than 30% of patients with hepatocellular carcinoma (HCC) are eligible to receive curative therapies, and so a better understanding of the molecular mechanisms of HCC is needed to identify potential therapeutic targets. The role of microRNA (miRNA) in modulating tumour progression has been demonstrated, and therapies targeting miRNA appear promising. miR-204-5p has been shown to function in numerous types of cancer, but its role in HCC remains unclear. In this study, we found that miR-204-5p expression was downregulated in cancerous HCC tissues compared to nontumour tissues...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435408/a-putative-rna-binding-protein-from-plasmodium-vivax-apicoplast
#13
Sofía M García-Mauriño, Antonio Díaz-Quintana, Francisco Rivero-Rodríguez, Isabel Cruz-Gallardo, Christian Grüttner, Marian Hernández-Vellisca, Irene Díaz-Moreno
Malaria is caused by Apicomplexa protozoans from the Plasmodium genus entering the bloodstream of humans and animals through the bite of the female mosquitoes. The annotation of the Plasmodium vivax genome revealed a putative RNA binding protein (apiRBP) that was predicted to be trafficked into the apicoplast, a plastid organelle unique to Apicomplexa protozoans. Although a 3D structural model of the apiRBP corresponds to a noncanonical RNA recognition motif with an additional C-terminal α-helix (α3), preliminary protein production trials were nevertheless unsuccessful...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435407/bmp3-expression-by-osteoblast-lineage-cells-is-regulated-by-canonical-wnt-signaling
#14
Shoichiro Kokabu, Vicki Rosen
Bone morphogenetic protein (BMP) and canonical Wnt (cWnt) signaling factors are both known to regulate bone mass, fracture risk, fracture repair, and osteoblastogenesis. BMP3 is the most abundant BMP and negatively regulates osteoblastogenesis and bone mass. Thus, identifying the mechanism by which BMP3 acts to depress bone formation may allow for the development of new therapeutics useful in the treatment for osteopenia and osteoporosis. Here, we report that cWnt signaling stimulates BMP3 expression in osteoblast (OB) lineage cells...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29435406/the-stl-repressor-from-staphylococcus-aureus-is-an-efficient-inhibitor-of-the-eukaryotic-fruitfly-dutpase
#15
András Benedek, István Pölöskei, Olivér Ozohanics, Károly Vékey, Beáta G Vértessy
DNA metabolism and repair is vital for the maintenance of genome integrity. Specific proteinaceous inhibitors of key factors in this process have high potential for deciphering pathways of DNA metabolism and repair. The dUTPase enzyme family is responsible for guarding against erroneous uracil incorporation into DNA. Here, we investigate whether the staphylococcal Stl repressor may interact with not only bacterial but also eukaryotic dUTPase. We provide experimental evidence for the formation of a strong complex between Stl and Drosophila melanogaster dUTPase...
February 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29321964/introduction-of-h2c2-type-zinc-binding-residues-into-hiv-2-vpr-increases-its-expression-level
#16
Ryoko Koga, Minami Yamamoto, Halil Ibrahim Ciftci, Masami Otsuka, Mikako Fujita
Human immunodeficiency virus type 2 has two structurally similar proteins, Vpx and Vpr. Vpx degrades the host anti-viral protein SAMHD1 and is expressed at high levels, while Vpr is responsible for cell cycle arrest and is expressed at much lower levels. We constructed a Vpr mutant with a high level of expression by replacing the amino acids HHCR/HHCH with a putative H2C2-type zinc-binding site that is carried by Vpx. Our finding suggests that during the evolution of Vpr and Vpx, zinc-binding likely became a mechanism for regulating their expression levels...
January 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29321963/a-critical-role-of-hepatitis-b-virus-polymerase-in-cirrhosis-hepatocellular-carcinoma-and-steatosis
#17
Hea-Jong Chung, Xiao Chen, Yang Yu, Heui-Kwan Lee, Chang Ho Song, Han Choe, Seungkoo Lee, Hyeon-Jin Kim, Seong-Tshool Hong
Hepatitis B is one of the most common infectious diseases in the world; more than 350 million people are carriers of hepatitis B virus (HBV). Chronic HBV infection (CHB) leads to liver diseases such as cirrhosis, hepatocellular carcinoma (HCC), and steatosis. Despite its seriousness in terms of public health, the pathogenic mechanism of how CHB leads to liver diseases, especially cirrhosis and steatosis, remains unclear. We studied the role of HBV polymerase (HBp) reverse transcriptase (RT) activity in association with the pathogenesis of liver diseases in CHB by developing transgenic mice expressing HBp or the RT domain of HBp...
January 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29321962/mutual-influence-of-secondary-and-key-drug-resistance-mutations-on-catalytic-properties-and-thermal-stability-of-tem-type-%C3%AE-lactamases
#18
Vitaly Grigorenko, Igor Uporov, Maya Rubtsova, Irina Andreeva, Dmitrii Shcherbinin, Alexander Veselovsky, Oksana Serova, Maria Ulyashova, Igor Ishtubaev, Alexey Egorov
Highly mutable β-lactamases are responsible for the ability of Gram-negative bacteria to resist β-lactam antibiotics. Using site-directed mutagenesis technique, we have produced in vitro a number of recombinant analogs of naturally occurring TEM-type β-lactamases, bearing the secondary substitution Q39K and key mutations related to the extended-spectrum (E104K, R164S) and inhibitor-resistant (M69V) β-lactamases. The mutation Q39K alone was found to be neutral and hardly affected the catalytic properties of β-lactamases...
January 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29321961/biophysical-characterization-of-atg11-a-scaffold-protein-essential-for-selective-autophagy-in-yeast
#19
Hironori Suzuki, Nobuo N Noda
Autophagy is an intracellular degradation system in which the formation of an autophagosome is a key event. In budding yeast, autophagosomes are generated from the preautophagosomal structure (PAS), in which Atg11 and Atg17 function as scaffolds essential for selective and nonselective types of autophagy, respectively. Structural studies have been extensively performed on Atg17, but not on Atg11, preventing us from understanding the selective type of the PAS. Here, we purified and characterized Atg11. Biophysical analyses, including analytical ultracentrifugation and CD, showed that Atg11 behaves as an elongated homodimer abundant in α-helices in solution...
January 2018: FEBS Open Bio
https://www.readbyqxmd.com/read/29321960/the-clinical-value-of-mir-193a-3p-in-non-small-cell-lung-cancer-and-its-potential-molecular-mechanism-explored-in-silico-using-rna-sequencing-and-microarray-data
#20
Xiang Gao, Rui-Xue Tang, Qiong-Ni Xie, Jia-Ying Lin, Hong-Lan Shi, Gang Chen, Zu-Yun Li
miR-193a-3p is a tumor-related miRNA playing an essential role in tumorigenesis and progression of non-small cell lung cancer (NSCLC). The objective of the present study was to investigate the relationship between miR-193a-3p expression and clinical value and to further explore the potential signaling of miR-193a-3p in the carcinogenesis of NSCLC. RNA-sequencing and microarray data were collected from the databases GEO, ArrayExpress and The Cancer Genome Atlas (TCGA). Furthermore, in silico assessments were performed to analyze the prospective pathways and networks of the target genes of miR-193a-3p...
January 2018: FEBS Open Bio
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