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https://www.readbyqxmd.com/read/29331014/biochemical-characterization-of-recombinant-thermostable-cohnella-sp-a01-%C3%AE-glucanase
#1
Meysam Rezaie, Saeed Aminzadeh, Farid Heidari, Masoud Mashhadi Akbar Boojar, Ali Asghar Karkhane
Background: Typically, non-cellulytic glucanase, including fungi and yeast cell wall hydrolyzing enzymes, are release by some symbiotic fungi and plants during the mycoparasitic fungi attack on plants. These enzymes are known as the defense mechanisms of plants. This study intends to investigate the biochemical properties of β-1,6-glucanase (bg16M) from native thermophilic bacteria, Cohnella A01. Methods: bg16M gene was cloned and expressed in E. coli BL21 (DE3)...
January 13, 2018: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/29330664/an-iranian-genomic-sequence-of-beet-mosaic-virus-provides-insights-into-diversity-and-evolution-of-the-world-population
#2
Musa Mohammadi, Adrian J Gibbs, Ahmad Hosseini, Samin Hosseini
Beet mosaic virus (BtMV), the only Potyvirus known to infect sugar beet, occurs worldwide in beet crops. The full genome sequencing of a BtMV isolate from Iran (Ir-VRU), enabled us to better understand the evolutionary history of this virus. Selection analysis suggested that BtMV evolution is mainly under negative selection but its strength varies in different proteins with the multifunctional proteins under strongest selection. Recombination has played a major role in the evolution of the BtMVs; only the Ir-VRU and USA isolates show no evidence of recombination...
January 12, 2018: Virus Genes
https://www.readbyqxmd.com/read/29330536/carbon-limitation-drives-gc-content-evolution-of-a-marine-bacterium-in-an-individual-based-genome-scale-model
#3
Ferdi L Hellweger, Yongjie Huang, Haiwei Luo
An important unanswered question in evolutionary genomics is the source of considerable variation of genomic base composition (GC content) even among organisms that share one habitat. Evolution toward GC-poor genomes has been considered a major adaptive pathway in the oligotrophic ocean, but GC-rich bacteria are also prevalent and highly successful in this environment. We quantify the contribution of multiple factors to the change of genomic GC content of Ruegeria pomeroyi DSS-3, a representative and GC-rich member in the globally abundant Roseobacter clade, using an agent-based model...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29330189/targeted-synthesis-and-characterization-of-a-gene-cluster-encoding-nad-p-h-dependent-3%C3%AE-3%C3%AE-and-12%C3%AE-hydroxysteroid-dehydrogenases-from-eggerthella-cag-298-a-gut-metagenomic-sequence
#4
Sean M Mythen, Saravanan Devendran, Celia Méndez-García, Isaac Cann, Jason M Ridlon
Gut metagenomic sequences provide a rich source of microbial genes, the majority of which are annotated by homology or unknown. Genes and gene pathways that encode enzymes catalyzing biotransformation of host bile acids are important to identify in gut metagenomic sequences due to the importance of bile acids on gut microbiome structure and host physiology. Hydroxysteroid dehydrogenases (HSDH) are pyridine nucleotide-dependent enzymes with stereo-specificity and regio-specificity for bile acid and steroid hydroxyl groups...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29330186/effect-of-plasmid-design-and-type-of-integration-event-on-recombinant-protein-expression-in-pichia-pastoris
#5
Thomas Vogl, Leigh Gebbie, Robin W Palfreyman, Robert Speight
Pichia pastoris (syn. Komagataella phaffii) is one of the most common eukaryotic expression systems for heterologous protein production. Expression cassettes are typically integrated in the genome to obtain stable expression strains. In contrast to Saccharomyces cerevisiae, where short overhangs are sufficient to target highly specific integration, long overhangs are more efficient in P. pastoris and ectopic integration of foreign DNA can occur. Here, we aimed to elucidate the influence of ectopic integration by high throughput screening of >700 transformants and whole genome sequencing of 27 transformants...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29330092/a-novel-double-antigen-sandwich-elisa-for-the-species-independent-detection-of-crimean-congo-hemorrhagic-fever-virus-specific-antibodies
#6
Miriam A Sas, Loic Comtet, Fabien Donnet, Marc Mertens, Zati Vatansever, Noel Tordo, Philippe Pourquier, Martin H Groschup
Crimean-Congo hemorrhagic fever (CCHF) is a tick-borne disease in humans caused by the CCHF virus (CCHFV). The detection of anti-CCHFV antibodies in animals is used to reveal infection risk areas. Therefore a simple, quick and reliable multispecies assay for the detection of CCHFV-specific antibodies is needed. This work presents the development and validation of a novel CCHF double-antigen ELISA for the detection of anti-CCHFV nucleoprotein antibodies. The test requires 30 μl of serum, and results are obtained within 90 min...
January 9, 2018: Antiviral Research
https://www.readbyqxmd.com/read/29329863/preparation-of-gentiooligosaccharides-using-trichoderma-viride-%C3%AE-glucosidase
#7
Fei Wang, Jing Wu, Sheng Chen
The recombinant plasmid pPIC9K-bgl1 containing β-glucosidase bgl1 from Trichoderma viride was constructed by overlapping PCR and integrated into Pichia pastoris KM71. In order to assist the formation of disulfide bonds and thus improve protein folding efficiency, protein disulfide isomerase pdi was co-expressed in the P. pastoris KM71/pPIC9K-bgl1/pPICZ-A-pdi strain, and fermentation in flasks resulted in enzyme activity of 143 U/ml. The enzyme activity of β-glucosidase reached 1402 U/ml following optimisation of fermentation conditions in a 3...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329667/gel-forming-mucin-interactome-drives-mucus-viscoelasticity
#8
REVIEW
Bastien Demouveaux, Valérie Gouyer, Frédéric Gottrand, Tetsuharu Narita, Jean-Luc Desseyn
Mucus is a hydrogel that constitutes the first innate defense in all mammals. The main organic component of mucus, gel-forming mucins, forms a complex network through both reversible and irreversible interactions that drive mucus gel formation. Significant advances in the understanding of irreversible gel-forming mucins assembly have been made using recombinant protein approaches. However, little is known about the reversible interactions that may finely modulate mucus viscoelasticity, which can be characterized using rheology...
December 28, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/29329415/establishment-of-a-three-dimensional-model-to-study-human-uterine-angiogenesis
#9
Camille L Duran, Colette A Abbey, Kayla J Bayless
STUDY QUESTION: Can primary human uterine microvascular endothelial cells (UtMVECs) be used as a model to study uterine angiogenic responses in vitro that are relevant in pregnancy? SUMMARY ANSWER: UtMVECs demonstrated angiogenic responses when stimulated with proangiogenic factors, including sphingosine 1-phosphate (S1P), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), physiological levels of wall shear stress (WSS), human chorionic gonadotropin (hCG) and various combinations of estrogen and progesterone...
December 21, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29329290/morc2b-is-essential-for-meiotic-progression-and-fertility
#10
Baolu Shi, Jiangyang Xue, Jian Zhou, Seth D Kasowitz, Yuanwei Zhang, Guanxiang Liang, Yongjuan Guan, Qinghua Shi, Mingxi Liu, Jiahao Sha, Xiaoyan Huang, P Jeremy Wang
The microrchidia (MORC) family proteins are chromatin-remodelling factors and function in diverse biological processes such as DNA damage response and transposon silencing. Here, we report that mouse Morc2b encodes a functional germ cell-specific member of the MORC protein family. Morc2b arose specifically in the rodent lineage through retrotransposition of Morc2a during evolution. Inactivation of Morc2b leads to meiotic arrest and sterility in both sexes. Morc2b-deficient spermatocytes and oocytes exhibit failures in chromosomal synapsis, blockades in meiotic recombination, and increased apoptosis...
January 12, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29328998/immunization-of-mice-with-egg1y162-1-2-provides-protection-against-echinococcus-granulosus-infection-in-balb-c-mice
#11
Fengbo Zhang, Shaoyu Li, Yuejie Zhu, Chuntao Zhang, Yujiao Li, Haimei Ma, Nannan Pang, Mengting An, Hongying Wang, Jianbing Ding
AIMS: This study is to predict and purify the T-B combined epitopes of egG1Y162 antigen in Echinococcus granulosus, and to evaluate their immunogenicity in mice. METHODS: The bioinformatics software was used to predict the T-B combined epitopes of egG1Y162 antigen. Recombinant egG1Y161/2 peptides were constructed, expressed and purified. Mice were immunized with egG1Y161/2 peptides. The serum and spleen cells were isolated. The isolated spleen cells were stimulated with egG1Y161/2 peptides in vitro and the culture supernatant was collected...
January 9, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29328653/extending-half-life-of-h-ferritin-nanoparticle-by-fusing-albumin-binding-domain-for-doxorubicin-encapsulation
#12
Chunyue Wang, Chun Zhang, Zenglan Li, Shuang Yin, Qi Wang, Fangxia Guo, Yao Zhang, Rong Yu, Yongdong Liu, Zhiguo Su
Nanoparticles based on the heavy chain of the human ferritin (HFn) are arousing growing interest in the field of drug-delivery due to their exceptional characteristics. However, the unsatisfied plasma half-life of HFn substantially limits its application as a delivery platform for anti-tumor agents. Herein, we fused an albumin binding domain (ABD) variant which basically derives from the streptococcal protein G and possesses a long-acting characteristic in serum albumin to the N-terminus of the HFn for the aim of half-life extension...
January 12, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29328647/development-of-yam-dioscorin-loaded-nanoparticles-for-paracellular-transport-across-human-intestinal-caco-2-cell-monolayers
#13
Hung-Ling Hsieh, Chia-Hung Lee, Kuo-Chih Lin
Dioscorins, the major storage proteins of yam tubers, exert immunomodulatory activities. To improve the oral bioavailability of dioscorins in the intestine, recombinant dioscorin (rDioscorin) was coated with trimethyl chitosan (TMC) and tripolyphosphate (TPP), resulting in the formation of TMC-rDio-TPP nanoparticles (NPs). The loading capacity and entrapment efficiency of rDioscorin in the NPs were 26<u>+</u>0.7% and 61<u>+</u>1.4%, respectively. The NPs demonstrated a substantial release profile in the pH environment of the jejunum...
January 12, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29328552/changes-in-chromosome-counts-and-patterns-in-cho-cell-lines-upon-generation-of-recombinant-cell-lines-and-subcloning
#14
Sabine Vcelar, Michael Melcher, Norbert Auer, Astrid Hrdina, Anja Puklowski, Friedrich Leisch, Vaibhav Jadhav, Till Wenger, Martina Baumann, Nicole Borth
Chinese hamster ovary cells are the number one production system for therapeutic proteins. A pre-requirement for their use in industrial production of biopharmaceuticals is to be clonal, thus originating from a single cell in order to be phenotypically and genomically identical. In the present study it was evaluated whether standard procedures, such as the generation of a recombinant cell line in combination with selection for a specific and stable phenotype (expression of the recombinant product) or subcloning have any impact on karyotype stability or homogeneity in CHO cells...
January 12, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29328525/a-role-of-sialic-acid-containing-glycans-of-matrix-metalloproteinase-9-mmp-9-in-the-interaction-between-mmp-9-and-staphylococcal-superantigen-like-protein-5-ssl5
#15
Chisato Kurisaka, Teruaki Oku, Saotomo Itoh, Tsutomu Tsuji
The staphylococcal superantigen-like proteins (SSLs) exhibit no superantigenic activity but have recently been considered to act as immune suppressors. It was previously reported that SSL5 bound to P-selectin glycoprotein ligand-1 (PSGL-1) and matrix metalloproteinase (MMP)-9, leading to inhibition of leukocyte adhesion and invasion. These interactions were suggested to depend on sialic acid-containing glycans of MMP-9, but the roles of sialic acids in the interaction between SSL5 and MMP-9 are still controversial...
January 12, 2018: Microbiology and Immunology
https://www.readbyqxmd.com/read/29328419/screening-and-clinical-evaluation-of-dominant-peptides-of-centromere-protein-f-antigen-for-early-diagnosis-of-hepatocellular-carcinoma
#16
Siwen Li, Xiaojin Li, Anjian Xu, Bei Zhang, Xiaomin He, Hongda Chen, Jian Huang
Tumor-associated antigens, such as centromere protein F (CENP‑F), have been recognized as potential serological biomarkers for early diagnosis of hepatocellular carcinoma (HCC); however, the exact regions corresponding to the dominant peptides of CENP‑F antigen remain to be explored. We aimed to screen and evaluate potential dominant peptides of CENP‑F for early diagnosis of HCC. Dominant peptides of CENP‑F were predicted by BioSun version 3.0, and the corresponding recombinant proteins were prepared...
January 4, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29328397/aberrant-expression-of-il-23-il-23r-in-patients-with-breast-cancer-and-its-clinical-significance
#17
Shuhai Sheng, Jinji Zhang, Jianzhong Ai, Xueli Hao, Ruishen Luan
Breast cancer tissues and adjacent tissues were collected from 32 patients who were treated in The Third Hospital of Chengde City. Reverse transcription‑quantitative polymerase chain reaction results demonstrated that, compared with the adjacent tissues, interleukin (IL)‑23/IL‑23 receptor (R) gene expression levels were notably higher in breast cancer tissues. Furthermore, IL‑23 and IL‑23R expression levels were positively correlated with patients' tumor size, TNM stage and metastasis. Recombinant human (rh) IL‑23 (10 ng/ml) was used for the stimulation of the MCF‑7 cell line...
January 12, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29327672/linear-epitopes-in-african-swine-fever-virus-p72-recognized-by-monoclonal-antibodies-prepared-against-baculovirus-expressed-antigen
#18
Mallory E Heimerman, Maria V Murgia, Ping Wu, Andre D Lowe, Wei Jia, Raymond R Rowland
Protein p72 is the major capsid protein of African swine fever virus (ASFV) and is an important target for test and vaccine development. Monoclonal antibodies (mAbs) were prepared against a recombinant antigenic fragment, from amino acid (aa) 20-303, expressed in baculovirus. A total of 29 mAbs were recovered and tested by immunofluorescent antibody (IFA) staining on ASFV Lisbon-infected Vero cells. Six antibodies were IFA-positive and selected for further characterization. Epitope mapping was performed against overlapping polypeptides expressed in E...
January 1, 2018: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/29327235/complete-genome-sequence-of-a-phage-hyperparasite-of-candidatus-xenohaliotis-californiensis-rickettsiales-a-pathogen-of-haliotis-spp-gasteropoda
#19
Roberto Flores, Jorge Cáceres-Martínez, Miguel Ángel Del Río-Portilla, Alexei F Licea-Navarro, Ricardo Gonzales-Sánchez, Abraham Guerrero
Bacteriophages are recognized as major mortality agents of microbes, among them intracellular marine rickettsiales-like bacteria. Recently, a phage hyperparasite of Candidatus Xenohaliotis californiensis (CXc) has been described. This bacterium is considered the causal agent of Withering Syndrome (WS) which is a chronic and potentially lethal disease of abalone species from California, USA and the peninsula of Baja California, Mexico. This hyperparasite which infects CXc could be used as a biocontrol agent for WS...
January 11, 2018: Archives of Virology
https://www.readbyqxmd.com/read/29327130/main-steps-in-dna-double-strand-break-repair-an-introduction-to-homologous-recombination-and-related-processes
#20
REVIEW
Lepakshi Ranjha, Sean M Howard, Petr Cejka
DNA double-strand breaks arise accidentally upon exposure of DNA to radiation and chemicals or result from faulty DNA metabolic processes. DNA breaks can also be introduced in a programmed manner, such as during the maturation of the immune system, meiosis, or cancer chemo- or radiotherapy. Cells have developed a variety of repair pathways, which are fine-tuned to the specific needs of a cell. Accordingly, vegetative cells employ mechanisms that restore the integrity of broken DNA with the highest efficiency at the lowest cost of mutagenesis...
January 11, 2018: Chromosoma
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