keyword
MENU ▼
Read by QxMD icon Read
search

leucin

keyword
https://www.readbyqxmd.com/read/29334589/preparation-and-evaluation-of-a-deoxycholic-calix-4-arene-hybrid-type-receptor-as-a-chiral-stationary-phase-for-hplc
#1
Sadegh Yaghoubnejad, Kourosh Tabar Heydar, Seyyed Hamid Ahmadi, Reza Zadmard, Nima Ghonouei
We report the synthesis and enantioseparation characteristics of two novel covalently immobilized deoxycholic acid derivatives as chiral stationary phases for high-performance liquid chromatography. In the structure of the first stationary phase, the 3-position of deoxycholic acid is substituted with a 3,5-dinitrophenylcarbamoyl group and the second one has an additional calix[4]arene attached to the carboxylic group of the deoxycholic acid. The chromatographic performance of the stationary phases was evaluated with enantioseparation of N-(3,5-dinitrobenzoyl)-dl-leucine, N-(3,5-dinitrobenzoyl)-dl-valine, omeprazole, diclofop-methyl, dl-mandelic acid and (RS)-pregabalin...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29332931/proteasome-inhibitor-carbobenzoxy-l-leucyl-l-leucyl-l-leucinal-mg132-enhances-therapeutic-effect-of-paclitaxel-on-breast-cancer-by-inhibiting-nuclear-factor-nf-%C3%AE%C2%BAb-signaling
#2
Yunjing Zhang, Bin Yang, Jinping Zhao, Xiaoli Li, Long Zhang, Zhenhua Zhai
BACKGROUND Carbobenzoxy-L-leucyl-L-leucyl-L-leucinal (MG132), a peptide aldehyde proteasome inhibitor, can inhibit tumor progression by inactivating nuclear factor (NF)-κB signaling. Paclitaxel (PTX) is part of a routine regimen for the treatment of breast cancer. However, activation of the NF-κB pathway after treatment with PTX confers insensitivity to this drug. This study investigated the potential effect of MG132 as a co-treatment with PTX against breast cancer, and clarifies the underlying molecular mechanisms...
January 15, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29330913/the-mechanism-of-diflufenican-resistance-and-its-inheritance-in-oriental-mustard-sisymbrium-orientale-l-from-australia
#3
Hue Thi Dang, Jenna Moira Malone, Peter Boutsalis, Gurjeet Gill, Christopher Preston
BACKGROUND: An oriental mustard population (P3) collected near Quambatook, Victoria was identified resistant to diflufenican by screening with the field rate (200 g a.i. ha-1 ) of the herbicide. The mechanism (s) of diflufenican resistance and its inheritance in this population was therefore investigated. RESULTS: Dose-response experiment confirmed population P3 was 140-fold more resistant to diflufenican as determined by the comparison of LD50 values with the susceptible populations...
January 13, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29330069/conformation-and-trimer-association-of-the-transmembrane-domain-of-the-parainfluenza-virus-fusion-protein-in-lipid-bilayers-from-solid-state-nmr-insights-into-the-sequence-determinants-of-trimer-structure-and-fusion-activity
#4
Myungwoon Lee, Hongwei Yao, Byungsu Kwon, Alan J Waring, Peter Ruchala, Chandan Singh, Mei Hong
Enveloped viruses enter cells by using their fusion proteins to merge the virus lipid envelope and the cell membrane. While crystal structures of the water-soluble ectodomains of many viral fusion proteins have been determined, the structure and assembly of the C-terminal transmembrane domain (TMD) remains poorly understood. Here we use solid-state NMR to determine the backbone conformation and oligomeric structure of the TMD of the parainfluenza virus 5 (PIV5) fusion protein. 13C chemical shifts indicate that the central leucine-rich segment of the TMD is α-helical in POPC/cholesterol membranes and POPE membranes, while the Ile- and Val-rich termini shift to the β-strand conformation in the POPE membrane...
January 9, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29329981/molecular-cloning-and-characterization-of-leucine-aminopeptidase-gene-from-taenia-pisiformis
#5
Shaohua Zhang, Xuepeng Cai, Xuenong Luo, Shuai Wang, Aijiang Guo, Junling Hou, Run Wu
Leucine aminopeptidase (LAP, EC: 3.4.11.1) is an important metalloexopeptidase that catalyze the hydrolysis of amino-terminal leucine residues from polypeptides and proteins. In this study, a full length of cDNA encoding leucine aminopeptidase of Taenia pisiformis (TpLAP) was cloned by rapid amplification of cDNA-ends using the polymerase chain reaction (RACE-PCR) method. The full-length cDNA of the TpLAP gene is 1823 bp and contains a 1569 bp ORF encoding 533 amino acids with a putative mass of 56.4 kDa...
January 9, 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29329236/gender-associated-impact-of-early-leucine-supplementation-on-adult-predisposition-to-obesity-in-rats
#6
Nora López, Juana Sánchez, Andreu Palou, Francisca Serra
Early nutrition plays an important role in development and may constitute a relevant contributor to the onset of obesity in adulthood. The aim of this study was to evaluate the long-term impact of maternal leucine (Leu) supplementation during lactation on progeny in rats. A chow diet, supplemented with 2% Leu, was supplied during lactation (21 days) and, from weaning onwards, was replaced by a standard chow diet. Then, at adulthood (6 months of age), this was replaced with hypercaloric diets (either with high-fat (HF) or high-carbohydrate (HC) content), for two months, to induce obesity...
January 12, 2018: Nutrients
https://www.readbyqxmd.com/read/29328371/cd133-expression-predicts-post-operative-recurrence-in-patients-with-colon-cancer-with-peritoneal-metastasis
#7
Hiroshi Nagata, Soichiro Ishihara, Junko Kishikawa, Hirofumi Sonoda, Koji Murono, Shigenobu Emoto, Manabu Kaneko, Kazuhito Sasaki, Kensuke Otani, Takeshi Nishikawa, Toshiaki Tanaka, Tomomichi Kiyomatsu, Keisuke Hata, Kazushige Kawai, Hiroaki Nozawa
Despite extensive research on cancer stem cells in colorectal cancer, the impact of stem cell markers on patient survival remains unclear, particularly in those with distant metastasis. In this study, we focused on colon cancer with peritoneal metastasis and investigated the association between the expression of CD133, aldehyde dehydrogenase-1 (ALDH1) and leucine-rich repeating G-protein coupled receptor-5 (Lgr5), and disease prognosis. Putative stem cell marker expression was immunohistochemically evaluated in samples from 142 primary tumours and 75 peritoneal nodules...
January 8, 2018: International Journal of Oncology
https://www.readbyqxmd.com/read/29327308/methionine-in-proteins-it-s-not-just-for-protein-initiation-anymore
#8
Jung Mi Lim, Geumsoo Kim, Rodney L Levine
Methionine in proteins is often thought to be a generic hydrophobic residue, functionally replaceable with another hydrophobic residue such as valine or leucine. This is not the case, and the reason is that methionine contains sulfur that confers special properties on methionine. The sulfur can be oxidized, converting methionine to methionine sulfoxide, and ubiquitous methionine sulfoxide reductases can reduce the sulfoxide back to methionine. This redox cycle enables methionine residues to provide a catalytically efficient antioxidant defense by reacting with oxidizing species...
January 11, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29327126/antipyretic-effect-of-herba-ephedrae-ramulus-cinnamomi-herb-pair-on-yeast-induced-pyrexia-rats-a-metabolomics-study
#9
Xiao-Ming Wang, Wen-Jie Xu, Liang-Kui Xu, Shuai Song, Xue-Feng Xing, Jia-Bo Luo
OBJECTIVE: To investigate the antipyretic mechanism of Herba Ephedrae (Eph)-Ramulus Cinnamomi (RC) herb pair on yeast-induced pyrexia in rats. METHODS: Totally 30 qualifified male SD rats were randomly assigned to the normal control (NC) group, the pyrexia model (model) group, the Eph, RC and Eph-RC treatment groups by a random digital table, 6 rats in each group. Each rat received a 20% aqueous suspension of yeast (10 mL/kg) except the NC group. The 3 treatment groups were administered 8...
January 9, 2018: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29326164/the-glutamine-transporter-asct2-slc1a5-promotes-tumor-growth-independently-of-the-amino-acid-transporter-lat1-slc7a5
#10
Yann Cormerais, Pierre André Massard, Milica Vucetic, Sandy Giuliano, Eric Tambutté, Jerome Durivault, Valérie Vial, Hitoshi Endou, Michael F Wempe, Scott K Parks, Jacques Pouyssegur
The transporters for glutamine and essential amino acids (EAA), ASCT2 (solute carrier family 1 member 5, SLC1A5), and LAT1 (solute carrier family 7 member 5, SLC7A5), respectively are overexpressed in aggressive cancers and have been identified as cancer-promoting targets. Moreover, previous work has suggested that glutamine influx via ASCT2 triggers EAA entry via the LAT1 exchanger, thus activating mechanistic target of rapamycin complex 1 (mTORC1) and stimulating growth. Here, to further investigate whether these two transporters are functionally coupled, we compared the respective knockout (KO) of either LAT1 or ASCT2 in colon (LS174T) and lung (A549) adenocarcinoma cell lines...
January 11, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29326050/a-defined-medium-for-leishmania-culture-allows-definition-of-essential-amino-acids
#11
Archana Nayak, Snezhana Akpunarlieva, Michael Barrett, Richard Burchmore
Axenic culture of Leishmania is generally performed in rich, serum-supplemented media which sustain robust growth over multiple passages. The use of such undefined media, however, obscures proteomic analyses and confounds the study of metabolism. We have established a simple, defined culture medium that supports the sustained growth of promastigotes over multiple passages and which yields parasites that have similar infectivity to macrophages to parasites grown in a conventional semi-defined medium. We have exploited this medium to investigate the amino acid requirements of promastigotes in culture and have found that phenylalanine and tryptophan are essential for viability in culture, while the absence of arginine, leucine, lysine, and valine results in significantly impaired, almost negligible growth...
January 8, 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29325334/-analysis-on-the-novel-compound-heterozygous-mutation-f%C3%A2-%C2%AA-of-a-patient-with-hereditary-factor-%C3%A2-%C2%AA-deficiency
#12
K Xu, K Y Shu, F F Li, T Chen, J Liu, S S Jin, J J Guo, Z H Zhang, M H Jiang
Objective: To investigate the clinical phenotype and genotype characteristics of a Chinese hereditary factor Ⅺ deficiency pedigree. Methods: The activated partial thromboplastin time (APTT), prothrombin time (PT), FⅪ activity (FⅪ: C) were measured by clotting method using automatic coagulation analyzer. The FⅪ antigen (FⅪ: Ag) was assayed by enzyme-linked immunosorbent assay (ELISA). Fifteen exons of F11 from the proband and his pedigree members were amplified by polymerase chain reaction (PCR), then sequenced...
December 26, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29323362/a-ph-responsive-aie-probe-for-enzyme-assays
#13
Leilei Shi, Yufeng Liu, Qian Wang, Tiankuo Wang, Yubin Ding, Yi Cao, Zhe Li, Hui Wei
By combining leucine (Leu) and tetraphenylethene (TPE), a pH-sensitive aggregation induced emission (AIE) probe TPE-Leu was developed. The aliphatic amine in TPE-Leu was more easily protonated under acidic conditions, which made TPE-Leu more water soluble. Therefore, the protonated AIE probe showed weak fluorescence under acidic conditions. When the pH was changed to basic conditions, it showed strong fluorescence due to the hydrophobic nature of TPE-Leu. We demonstrated that the probe showed high selectivity toward pH changes with the coexistence of other potential species such as metal ions, redox agents, and biomolecules...
January 11, 2018: Analyst
https://www.readbyqxmd.com/read/29321274/irf1-is-a-transcriptional-regulator-of-zbp1-promoting-nlrp3-inflammasome-activation-and-cell-death-during-influenza-virus-infection
#14
Teneema Kuriakose, Min Zheng, Geoffrey Neale, Thirumala-Devi Kanneganti
Innate immune sensing of influenza A virus (IAV) induces activation of various immune effector mechanisms, including the nucleotide and oligomerization domain, leucine-rich repeat-containing protein family, pyrin domain containing 3 (NLRP3) inflammasome and programmed cell death pathways. Although type I IFNs are identified as key mediators of inflammatory and cell death responses during IAV infection, the involvement of various IFN-regulated effectors in facilitating these responses are less studied. In this study, we demonstrate the role of IFN regulatory factor (IRF)1 in promoting NLRP3 inflammasome activation and cell death during IAV infection...
January 10, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29320743/a-p300-and-sirt1-regulated-acetylation-switch-of-c-ebp%C3%AE-controls-mitochondrial-function
#15
Mohamad A Zaini, Christine Müller, Tristan V de Jong, Tobias Ackermann, Götz Hartleben, Gertrud Kortman, Karl-Heinz Gührs, Fabrizia Fusetti, Oliver H Krämer, Victor Guryev, Cornelis F Calkhoven
Cellular metabolism is a tightly controlled process in which the cell adapts fluxes through metabolic pathways in response to changes in nutrient supply. Among the transcription factors that regulate gene expression and thereby cause changes in cellular metabolism is the basic leucine-zipper (bZIP) transcription factor CCAAT/enhancer-binding protein alpha (C/EBPα). Protein lysine acetylation is a key post-translational modification (PTM) that integrates cellular metabolic cues with other physiological processes...
January 9, 2018: Cell Reports
https://www.readbyqxmd.com/read/29320478/an-extracellular-network-of-arabidopsis-leucine-rich-repeat-receptor-kinases
#16
Elwira Smakowska-Luzan, G Adam Mott, Katarzyna Parys, Martin Stegmann, Timothy C Howton, Mehdi Layeghifard, Jana Neuhold, Anita Lehner, Jixiang Kong, Karin Grünwald, Natascha Weinberger, Santosh B Satbhai, Dominik Mayer, Wolfgang Busch, Mathias Madalinski, Peggy Stolt-Bergner, Nicholas J Provart, M Shahid Mukhtar, Cyril Zipfel, Darrell Desveaux, David S Guttman, Youssef Belkhadir
The cells of multicellular organisms receive extracellular signals using surface receptors. The extracellular domains (ECDs) of cell surface receptors function as interaction platforms, and as regulatory modules of receptor activation. Understanding how interactions between ECDs produce signal-competent receptor complexes is challenging because of their low biochemical tractability. In plants, the discovery of ECD interactions is complicated by the massive expansion of receptor families, which creates tremendous potential for changeover in receptor interactions...
January 10, 2018: Nature
https://www.readbyqxmd.com/read/29319530/coomassie-blue-g250-for-visualization-of-active-bacteria-from-lake-environment-and-culture
#17
Bartosz Kiersztyn, Waldemar Siuda, Ryszard Chróst
Bacteria play a fundamental role in the cycling of nutrients in aquatic environments. A precise distinction between active and inactive bacteria is crucial for the description of this process. We have evaluated the usefulness of Coomassie Blue G250 for fluorescent staining of protein containing potentially highly active bacteria. We found that the G250 solution has excitation and emission properties appropriate for direct epifluorescence microscopy observations. It enables fast and effective fluorescent visualization of living, protein-rich bacteria, both in freshwater environment and culture...
September 27, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/29319166/long-non-coding-rna-tcons_00041960-enhances-osteogenesis-and-inhibits-adipogenesis-of-rat-bone-marrow-mesenchymal-stem-cell-by-targeting-mir-204-5p-and-mir-125a-3p
#18
Guowei Shang, Yadong Wang, Yan Xu, Shanfeng Zhang, Xiaoya Sun, Hongya Guan, Xuefeng Zhao, Yisheng Wang, Yuebai Li, Guoqiang Zhao
A growing number of long non-coding RNAs (lncRNAs) have been found to be involved in diverse biological processes such as cell cycle regulation, embryonic development, and cell differentiation. However, limited knowledge is available concerning the underlying mechanisms of lncRNA functions. In this study, we found down-regulation of TCONS_00041960 during adipogenic and osteogenic differentiation of glucocorticoid-treated bone marrow mesenchymal stem cells (BMSCs). Furthermore, up-regulation of TCONS_00041960 promoted expression of osteogenic genes Runx2, osterix, and osteocalcin, and anti-adipogenic gene glucocorticoid-induced leucine zipper (GILZ)...
January 10, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29317492/a-protein-interaction-network-centered-on-leucine-rich-repeats-and-immunoglobulin-like-domains-1-lrig1-regulates-growth-factor-receptors
#19
Mahmood Faraz, Carl Herdenberg, Camilla Holmlund, Roger Henriksson, Håkan Hedman
Leucine-rich repeats and immunoglobulin-like domains 1 (LRIG1) is a tumor suppressor and a negative regulator of several receptor tyrosine kinases (RTKs). The molecular mechanisms by which LRIG1 mediates its tumor suppressor effects and regulates RTKs remain incompletely understood. Here, we performed a yeast two-hybrid screen to identify novel LRIG1-interacting proteins and mined data from the BioPlex (biophysical interactions of ORFeome-based complexes) protein interaction data repository. The putative LRIG1 interactors identified in the screen were functionally evaluated using a triple co-transfection system in which HEK293 cells were co-transfected with platelet-derived growth factor receptor alpha (PDGFRA), LRIG1, and shRNAs against the identified LRIG1 interactors...
January 9, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29316729/wnt-rspo-and-hippo-signalling-in-the-intestine-and-intestinal-stem-cells
#20
REVIEW
Vitezslav Kriz, Vladimir Korinek
In this review, we address aspects of Wnt, R-Spondin (RSPO) and Hippo signalling, in both healthy and transformed intestinal epithelium. In intestinal stem cells (ISCs), the Wnt pathway is essential for intestinal crypt formation and renewal, whereas RSPO-mediated signalling mainly affects ISC numbers. In human colorectal cancer (CRC), aberrant Wnt signalling is the driving mechanism initiating this type of neoplasia. The signalling role of the RSPO-binding transmembrane proteins, the leucine-rich-repeat-containing G-protein-coupled receptors (LGRs), is possibly more pleiotropic and not only limited to the enhancement of Wnt signalling...
January 8, 2018: Genes
keyword
keyword
117989
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"