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https://www.readbyqxmd.com/read/28214995/development-and-characterization-of-monoclonal-antibody-against-human-il-37b
#1
Yu-Chi Gao, Yan Jia, De-Qian Xiao, Xin Wang, You-Chao Dai, Shi-Yan Yu, Chen Chen, Ze-Gang Zhuang, Xiao-Xia Fu, Jun-Ai Zhang, Bi-Ying Zheng, Zhi-Hong Chen, Ji-Xin Zhong, Zhang-Quan Chen, Jun-Fa Xu
IL-37 has been described as a natural inhibitor of immune responses. Monoclonal antibody (mAb) against human IL-37b with high affinity and specificity can serve as a molecular probe to detect IL-37 and study IL-37 functions, mechanisms and related signal pathways in inflammatory diseases. However, there are very few such mAbs against human IL-37 commercially available so far. In the current study, monoclonal antibodies against human IL-37b were developed by fusing splenocytes from immunized mouse with SP2/0 myeloma cells and polyethylene glycol...
February 18, 2017: Cytotechnology
https://www.readbyqxmd.com/read/28207772/triticum-aestivum-wrab18-functions-in-plastids-and-confers-abiotic-stress-tolerance-when-overexpressed-in-escherichia-coli-and-nicotiania-benthamiana
#2
Xiaoyu Wang, Linsheng Zhang, Yane Zhang, Zhenqing Bai, Hao Liu, Dapeng Zhang
WRAB18, an ABA-inducible protein belongs to the third family of late embryogenesis abundant (LEA) proteins which can be induced by different biotic or abiotic stresses. In the present study, WRAB18 was cloned from the Zhengyin 1 cultivar of Triticum aestivum and overexpressed in Escherichia coli to explore its effects on the growth of E. coli under different abiotic stresses. Results suggested the enhanced exhibition of tolerance of E. coli to these stresses. Meanwhile, the WRAB18-transgenic tobacco plants were obtained to analyze the stress-related enzymatic activities of ascorbate peroxidase (APX), peroxidase (POD) and superoxide dismutase (SOD), and to quantify the content of malonaldehyde (MDA) under osmotic stress, high salinity, and low and high temperature stress...
2017: PloS One
https://www.readbyqxmd.com/read/28202049/costs-and-benefits-of-natural-transformation-in-acinetobacter-baylyi
#3
Nils Hülter, Vidar Sørum, Kristina Borch-Pedersen, Mikkel M Liljegren, Ane L G Utnes, Raul Primicerio, Klaus Harms, Pål J Johnsen
BACKGROUND: Natural transformation enables acquisition of adaptive traits and drives genome evolution in prokaryotes. Yet, the selective forces responsible for the evolution and maintenance of natural transformation remain elusive since taken-up DNA has also been hypothesized to provide benefits such as nutrients or templates for DNA repair to individual cells. RESULTS: We investigated the immediate effects of DNA uptake and recombination on the naturally competent bacterium Acinetobacter baylyi in both benign and genotoxic conditions...
February 15, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28196676/dihydroorotate-dehydrogenase-dhodh-inhibitors-affect-atp-depletion-endogenous-ros-and-mediate-s-phase-arrest-in-breast-cancer-cells
#4
A K Mohamad Fairus, B Choudhary, S Hosahalli, N Kavitha, O Shatrah
Dihydroorotate dehydrogenase (DHODH) is the key enzyme in de novo biosynthesis of pyrimidine in both prokaryotes and eukaryotes. The de novo pathway of pyrimidine biosynthesis is essential in cancer cells proliferation. Leflunomide is an approved DHODH inhibitor that has been widely used for the treatment of arthritis. Similarly, brequinar sodium is another DHODH inhibitor that showed anti-tumour effect in MC38 colon carcinoma cells when used in combination with fluorouracil. Despite the potential role of DHODH inhibitors in cancer therapy, their mechanisms of action remain obscure and await further elucidation...
February 11, 2017: Biochimie
https://www.readbyqxmd.com/read/28188741/molecular-dynamics-study-of-ion-transport-through-an-open-model-of-voltage-gated-sodium-channel
#5
Yang Li, Ruining Sun, Huihui Liu, Haipeng Gong
Voltage-gated sodium (NaV) channels are critical in the signal transduction of excitable cells. In this work, we modeled the open conformation for the pore domain of a prokaryotic NaV channel (NaVRh), and used molecular dynamics simulations to track the translocation of dozens of Na(+) ions through the channel in the presence of a physiological transmembrane ion concentration gradient and a transmembrane electrical field that was closer to the physiological one than previous studies. Channel conductance was then estimated from simulations on the wide-type and DEKA mutant of NaVRh...
February 8, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28187901/enhanced-immune-response-to-a-dual-promoter-anti-caries-dna-vaccine-orally-delivered-by-attenuated-salmonella-typhimurium
#6
Hao Jiang, Yijun Hu, Mei Yang, Hao Liu, Guangshui Jiang
The strength of immune responses induced by DNA vaccine is closely associated with the expression level of cloned antigens available to the antigen presenting cells (APCs). To acquire a larger and more persistent amount of antigen, a dual-promoter, which could double the target antigen output through its expression both in prokaryotic and eukaryotic cells, was employed in the constructed anti-caries DNA vaccine with attenuated Salmonella as mucosal delivery vector in this study. Here, both CMV and nirB promoters were included in the plasmid that harbors the genes encoding the functional epitopes of two virulence factors of S...
January 25, 2017: Immunobiology
https://www.readbyqxmd.com/read/28177649/evolutionary-relationships-and-taxa-specific-conserved-signature-indels-among-cellulases-of-archaea-bacteria-and-eukarya
#7
Lebin Thomas, Hari Ram, Ved Pal Singh
The cellulases from different cellulolytic organisms have evolutionary relationships, which range from single-celled prokaryotes to the complex eukaryotes of the living world. This in silico analysis revealed the presence of a conserved cellulase domain along with evolutionary relationships among cellulases from several species of Archaea, Bacteria, and Eukarya. The amino acid sequences of cellulases from Archaea and Bacteria showed closer identity with their domain or phylum members that provided insights into convergent and divergent evolution of cellulases from other enzymes with different substrate specificities...
February 8, 2017: Journal of Computational Biology: a Journal of Computational Molecular Cell Biology
https://www.readbyqxmd.com/read/28174299/the-chloroplast-tubulin-homologs-ftsza-and-ftszb-from-the-red-alga-galdieria-sulphuraria-co-assemble-into-dynamic-filaments
#8
Yaodong Chen, Katie Porter, Masaki Osawa, Anne Marie Augustus, Sara L Milam, Chandra Joshi, Katherine W Osteryoung, Harold P Erickson
FtsZ is a homolog of eukaryotic tubulin and is present in almost all bacteria and many archaea, where it is the major cytoskeletal protein in the Z ring, required for cell division. Unlike some other cell organelles of prokaryotic origin, chloroplasts have retained FtsZ as an essential component of the division machinery. However, chloroplast FtsZs have been challenging to study because they are difficult to express and purify. To this end, we have used a FATT-tag expression system to produce as soluble proteins the two chloroplast FtsZs from Galdieria sulphuraria, a thermophilic red alga...
February 7, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28173829/cloning-expression-and-molecular-characterization-of-a-cystoisospora-suis-specific-uncharacterized-merozoite-protein
#9
Aruna Shrestha, Nicola Palmieri, Ahmed Abd-Elfattah, Bärbel Ruttkowski, Marc Pagès, Anja Joachim
BACKGROUND: The genome of the apicomplexan parasite Cystoisospora suis (syn. Isospora suis) has recently been sequenced and annotated, opening the possibility for the identification of novel therapeutic targets against cystoisosporosis. It was previously proposed that a 42 kDa uncharacterized merozoite protein, encoded by gene CSUI_005805, might be a relevant vaccine candidate due to its high immunogenic score, high expression level and species-specificity as determined in silico. METHODS: The 1170 bp coding sequence of the CSUI_005805 gene was PCR amplified and cloned into the bacterial expression vector pQE-31...
February 7, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28171721/simulating-the-activation-of-voltage-sensing-domain-for-a-voltage-gated-sodium-channel-using-polarizable-force-field
#10
Rui-Ning Sun, Haipeng Gong
Voltage-gated sodium (NaV) channels play vital roles in the signal transduction of excitable cells. Upon activation of a NaV channel, the change of transmembrane voltage triggers conformational change of the voltage sensing domain, which then elicits opening of the pore domain and thus allows an influx of Na(+) ions. Description of this process with atomistic details is in urgent demand. In this work, we simulated the partial activation process of the voltage sensing domain of a prokaryotic NaV channel using a polarizable force field...
February 9, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28167931/the-active-component-of-aspirin-salicylic-acid-promotes-staphylococcus-aureus-biofilm-formation-in-a-pia-dependent-manner
#11
Cristian Dotto, Andrea Lombarte Serrat, Natalia Cattelan, María S Barbagelata, Osvaldo M Yantorno, Daniel O Sordelli, Monika Ehling-Schulz, Tom Grunert, Fernanda R Buzzola
Aspirin has provided clear benefits to human health. But salicylic acid (SAL) -the main aspirin biometabolite- exerts several effects on eukaryote and prokaryote cells. SAL can affect, for instance, the expression of Staphylococcus aureus virulence factors. SAL can also form complexes with iron cations and it has been shown that different iron chelating molecules diminished the formation of S. aureus biofilm. The aim of this study was to elucidate whether the iron content limitation caused by SAL can modify the S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28167519/regulation-of-polyhydroxybutyrate-accumulation-in-sinorhizobium-meliloti-by-the-trans-encoded-small-rna-mmgr
#12
Antonio Lagares, Germán Ceizel Borella, Uwe Linne, Anke Becker, Claudio Valverde
Riboregulation has a major role in the fine-tuning of multiple bacterial processes. Among the RNA players, trans-encoded untranslated small RNAs (sRNAs) regulate complex metabolic networks by tuning expression from multiple target genes in response to numerous signals. In Sinorhizobium meliloti, over 400 sRNAs are expressed under different stimuli. The sRNA MmgR-standing for Makes more granules Regulator-has been of particular interest to us since its sequence and structure are highly conserved among the α-proteobacteria, and its expression is regulated by the amount and quality of the bacterium's available nitrogen source...
February 6, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28158905/resistance-to-anti-cancer-drugs-permanently-alters-electrophoretic-mobility-of-cancer-cell-lines
#13
Hasan Hüseyin Kazan, Cagri Urfali-Mamatoglu, Ufuk Gündüz
Electrophoretic mobility is a physical phenomenon defining the mobility of charged particles in a solution under applied electric field. As charged biological systems, living cells including both prokaryotes and eukaryotes have been assessed in terms of electrophoretic mobility to decipher their electrochemical structure. Moreover, determination of electrophoretic mobility of living cancer cells have promoted the advance exploration of the nature of the cancer cells and separation of cancer cells from normal ones under applied electric field...
February 3, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28146359/efficient-genome-editing-of-a-facultative-thermophile-using-the-mesophilic-spcas9
#14
Ioannis Mougiakos, Elleke Fenna Bosma, Koen Weenink, Eric Michael Vossen, Kirsten Goijvaerts, John Van Der Oost, Richard van Kranenburg
Well-developed genetic tools for thermophilic microorganisms are scarce, despite their industrial and scientific relevance. Whereas highly efficient CRISPR-Cas9-based genome editing is on the rise in prokaryotes, it has never been employed in a thermophile. Here, we apply Streptococcus pyogenes Cas9 (spCas9)-based genome editing to a moderate thermophile, i.e. Bacillus smithii, including a gene deletion, gene knock-out via insertion of premature stop codons, and gene insertion. We show that spCas9 is inactive in vivo above 42°C and we employ the wide temperature growth range of B...
February 1, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28142322/microbes-and-cancer
#15
Amiran Dzutsev, Jonathan H Badger, Ernesto Perez-Chanona, Soumen Roy, Rosalba Salcedo, Carolyne K Smith, Giorgio Trinchieri
Commensal microorganisms (the microbiota) live on all the surface barriers of our body and are particularly abundant and diverse in the distal gut. The microbiota and its larger host represent a metaorganism in which the cross talk between microbes and host cells is necessary for health, survival, and regulation of physiological functions locally, at the barrier level, and systemically. The ancestral molecular and cellular mechanisms stemming from the earliest interactions between prokaryotes and eukaryotes have evolved to mediate microbe-dependent host physiology and tissue homeostasis, including innate and adaptive resistance to infections and tissue damage...
January 30, 2017: Annual Review of Immunology
https://www.readbyqxmd.com/read/28140372/expression-regulation-by-a-methyl-cpg-binding-domain-in-an-i-e-coli-i-based-cell-free-tx-tl-system
#16
Marc Schenkelberger, Siba Shanak, Marc Finkler, Emanuel Worst, Vincent Noireaux, Volkhard Helms, Albrecht Ott
Cytosine methylation plays an important role in the epigenetic regulation of eukaryotic gene expression. The methyl-CpG binding domain (MBD) is common to a family of eukaryotic transcriptional regulators. How MBD, a stretch of about 80 amino acids, recognizes CpGs in a methylation dependent manner, and as a function of sequence, is only partly understood. Here we show, using an<i> E. coli</i> cell-free expression system, that MBD from the human transcriptional regulator MeCP2 performs as a specific, methylation-dependent repressor in conjunction with the BDNF (Brain-Derived neurotrophic factor) promoter sequence...
January 31, 2017: Physical Biology
https://www.readbyqxmd.com/read/28137859/efficient-in-vivo-gene-editing-using-ribonucleoproteins-in-skin-stem-cells-of-recessive-dystrophic-epidermolysis-bullosa-mouse-model
#17
Wenbo Wu, Zhiwei Lu, Fei Li, Wenjie Wang, Nannan Qian, Jinzhi Duan, Yu Zhang, Fengchao Wang, Ting Chen
The prokaryotic CRISPR/Cas9 system has recently emerged as a powerful tool for genome editing in mammalian cells with the potential to bring curative therapies to patients with genetic diseases. However, efficient in vivo delivery of this genome editing machinery and indeed the very feasibility of using these techniques in vivo remain challenging for most tissue types. Here, we show that nonreplicable Cas9/sgRNA ribonucleoproteins can be used to correct genetic defects in skin stem cells of postnatal recessive dystrophic epidermolysis bullosa (RDEB) mice...
January 30, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28135316/the-relationship-between-environmental-dioxygen-and-iron-sulfur-proteins-explored-at-the-genome-level
#18
Claudia Andreini, Antonio Rosato, Lucia Banci
About 2 billion years ago, the atmosphere of the Earth experienced a great change due to the buildup of dioxygen produced by photosynthetic organisms. This transition caused a reduction of iron bioavailability and at the same time exposed living organisms to the threat of oxidative stress. Iron-sulfur (Fe-S) clusters require iron ions for their biosynthesis and are labile if exposed to reactive oxygen species. To assess how the above transition influenced the usage of Fe-S clusters by organisms, we compared the distribution of the Fe-S proteins encoded by the genomes of more than 400 prokaryotic organisms as a function of their dioxygen requirements...
2017: PloS One
https://www.readbyqxmd.com/read/28134821/non-canonical-replication-initiation-you-re-fired
#19
REVIEW
Bazilė Ravoitytė, Ralf Erik Wellinger
The division of prokaryotic and eukaryotic cells produces two cells that inherit a perfect copy of the genetic material originally derived from the mother cell. The initiation of canonical DNA replication must be coordinated to the cell cycle to ensure the accuracy of genome duplication. Controlled replication initiation depends on a complex interplay of cis-acting DNA sequences, the so-called origins of replication (ori), with trans-acting factors involved in the onset of DNA synthesis. The interplay of cis-acting elements and trans-acting factors ensures that cells initiate replication at sequence-specific sites only once, and in a timely order, to avoid chromosomal endoreplication...
January 27, 2017: Genes
https://www.readbyqxmd.com/read/28130424/the-action-of-escherichia-coli-crispr-cas-system-on-lytic-bacteriophages-with-different-lifestyles-and-development-strategies
#20
Alexandra Strotskaya, Ekaterina Savitskaya, Anastasia Metlitskaya, Natalia Morozova, Kirill A Datsenko, Ekaterina Semenova, Konstantin Severinov
CRISPR-Cas systems provide prokaryotes with adaptive defense against bacteriophage infections. Given an enormous variety of strategies used by phages to overcome their hosts, one can expect that the efficiency of protective action of CRISPR-Cas systems against different viruses should vary. Here, we created a collection of Escherichia coli strains with type I-E CRISPR-Cas system targeting various positions in the genomes of bacteriophages λ, T5, T7, T4 and R1-37 and investigated the ability of these strains to resist the infection and acquire additional CRISPR spacers from the infecting phage...
January 26, 2017: Nucleic Acids Research
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