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https://www.readbyqxmd.com/read/28102755/anionic-lipids-and-the-maintenance-of-membrane-electrostatics-in-eukaryotes
#1
Matthieu Pierre Platre, Yvon Jaillais
A wide range of signaling processes occurs at the cell surface through the reversible association of proteins from the cytosol to the plasma membrane. Some low abundant lipids are enriched at the membrane of specific compartments and thereby contribute to the identity of cell organelles by acting as biochemical landmarks. Lipids also influence membrane biophysical properties, which emerge as an important feature in specifying cellular territories. Such parameters are crucial for signal transduction and include lipid packing, membrane curvature and electrostatics...
January 19, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28102671/structural-analysis-of-glycosylated-intact-hiv-1-gp120-b12-antibody-complex-using-hydroxyl-radical-protein-footprinting
#2
Xiaoyan Li, Oliver C Grant, Keigo Ito, Aaron Wallace, Shixia Wang, Peng Zhao, Lance Wells, Shan Lu, Robert J Woods, Joshua S Sharp
Glycoprotein gp120 is a surface antigen and virulence factor of the human immunodeficiency virus-1 (HIV-1). Broadly neutralizing antibodies (bNAbs) that are reactive to gp120 from a variety of HIV isolates offer hope for the development of broadly effective immunogens for vaccination purposes, if the interactions between gp120 and bNAbs can be understood. From a structural perspective, gp120 is a particularly difficult system due to its size, the presence of multiple flexible regions, and the large amount of glycosylation, all of which are important in gp120-bNAb interactions...
January 19, 2017: Biochemistry
https://www.readbyqxmd.com/read/28102638/farnesoid-x-receptor-ablation-sensitizes-mice-to-hepatitis-b-virus-x-protein-induced-hepatocarcinogenesis
#3
Yongdong Niu, Meishu Xu, Betty L Slagle, Haihua Huang, Song Li, Grace L Guo, Ganggang Shi, Wenxin Qin, Wen Xie
: Chronic hepatitis B virus infection is a major risk factor for hepatocellular carcinoma (HCC). Hepatitis B virus X protein (HBx) is a hepatitis B virus protein that has multiple cellular functions, but its role in HCC pathogenesis has been controversial. Farnesoid X receptor (FXR) is a nuclear receptor with activities in anti-inflammation and inhibition of hepatocarcinogenesis. However, whether or how FXR can impact hepatitis B virus/HBx-induced hepatocarcinogenesis remains unclear...
November 5, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28102564/pkn2-is-essential-for-mouse-embryonic-development-and-proliferation-of-mouse-fibroblasts
#4
Sally Danno, Koji Kubouchi, Mona Mehruba, Manabu Abe, Rie Natsume, Kenji Sakimura, Satoshi Eguchi, Masahiro Oka, Masanori Hirashima, Hiroki Yasuda, Hideyuki Mukai
PKN2, a member of the protein kinase N (PKN) family, has been suggested by in vitro culture cell experiments to bind to Rho/Rac GTPases and contributes to cell-cell contact and cell migration. To unravel the in vivo physiological function of PKN2, we targeted the PKN2 gene. Constitutive disruption of the mouse PKN2 gene resulted in growth retardation and lethality before embryonic day (E) 10.5. PKN2(-/-) embryo did not undergo axial turning and showed insufficient closure of the neural tube. Mouse embryonic fibroblasts (MEFs) derived from PKN2(-/-) embryos at E9...
January 19, 2017: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/28102559/effect-of-bone-like-hydroxyapatite-poly-amino-acid-loaded-with-rifapentine-microspheres-on-bone-and-joint-tuberculosis-in-vitro
#5
Yuwu Liu, Dianming Jiang
Rifapentine-loaded poly(lactic-co-glycolic acid) microspheres (RPMs)-loaded bone-like hydroxyapatite/poly amino acid (BHA/PAA) is effective in curing S. aureus-induced chronic osteomyelitis. This study continues to investigate the effect of RPM-loaded BHA/PAA on the bacterial growth of Mycobacterium tuberculosis (MTB), cell proliferation and differentiation in MTB H37Rv-infected MG63 cells. Furthermore, whether Wnt/β-catenin signaling pathway was activated by RPM-loaded BHA/PAA was explored. We found the bactec growth index of H37Rv was significantly inhibited by RPM-loaded BHA/PAA...
January 19, 2017: Cell Biology International
https://www.readbyqxmd.com/read/28102354/a-signature-of-renal-stress-resistance-induced-by-short-term-dietary-restriction-fasting-and-protein-restriction
#6
F Jongbloed, T C Saat, M Verweij, C Payan-Gomez, J H J Hoeijmakers, S van den Engel, C T van Oostrom, G Ambagtsheer, S Imholz, J L A Pennings, H van Steeg, J N M IJzermans, M E T Dollé, R W F de Bruin
During kidney transplantation, ischemia-reperfusion injury (IRI) induces oxidative stress. Short-term preoperative 30% dietary restriction (DR) and 3-day fasting protect against renal IRI. We investigated the contribution of macronutrients to this protection on both phenotypical and transcriptional levels. Male C57BL/6 mice were fed control food ad libitum, underwent two weeks of 30%DR, 3-day fasting, or received a protein-, carbohydrate- or fat-free diet for various periods of time. After completion of each diet, renal gene expression was investigated using microarrays...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102317/time-resolved-neutron-scattering-provides-new-insight-into-protein-substrate-processing-by-a-aaa-unfoldase
#7
Ziad Ibrahim, Anne Martel, Martine Moulin, Henry S Kim, Michael Härtlein, Bruno Franzetti, Frank Gabel
We present a combination of small-angle neutron scattering, deuterium labelling and contrast variation, temperature activation and fluorescence spectroscopy as a novel approach to obtain time-resolved, structural data individually from macromolecular complexes and their substrates during active biochemical reactions. The approach allowed us to monitor the mechanical unfolding of a green fluorescent protein model substrate by the archaeal AAA+ PAN unfoldase on the sub-minute time scale. Concomitant with the unfolding of its substrate, the PAN complex underwent an energy-dependent transition from a relaxed to a contracted conformation, followed by a slower expansion to its initial state at the end of the reaction...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102310/coordinated-cell-motility-is-regulated-by-a-combination-of-lkb1-farnesylation-and-kinase-activity
#8
S Wilkinson, Y Hou, J T Zoine, J Saltz, C Zhang, Z Chen, L A D Cooper, A I Marcus
Cell motility requires the precise coordination of cell polarization, lamellipodia formation, adhesion, and force generation. LKB1 is a multi-functional serine/threonine kinase that associates with actin at the cellular leading edge of motile cells and suppresses FAK. We sought to understand how LKB1 coordinates these multiple events by systematically dissecting LKB1 protein domain function in combination with live cell imaging and computational approaches. We show that LKB1-actin colocalization is dependent upon LKB1 farnesylation leading to RhoA-ROCK-mediated stress fiber formation, but membrane dynamics is reliant on LKB1 kinase activity...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102235/clumping-factor-a-of-staphylococcus-aureus-interacts-with-annexina2-on-mammary-epithelial-cells
#9
Shoaib Ashraf, Jing Cheng, Xin Zhao
Staphylococcus aureus is one of major pathogens that can cause a series of diseases in different hosts. In the bovine, it mainly causes subclinical and contagious mastitis, but its mechanisms of infection are not fully understood. Considering the fact that virulence factors play key roles in interactions between the bacterium and host cells, this study aimed to identify if a binding partner of S. aureus clumping factor A (ClfA) exists on the bovine mammary epithelial cells. The ClfA protein was used as a bait to pull down lysates of cultured bovine mammary epithelial cells (MAC-T cells)...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102195/positive-association-between-kcnj5-rs2604204-a-c-polymorphism-and-plasma-aldosterone-levels-but-also-plasma-renin-and-angiotensin-i-and-ii-levels-in-newly-diagnosed-hypertensive-chinese-a-case-control-study
#10
H Wang, C Weng, H Chen
Variants in G protein-coupled inward rectifier K(+) channels 4 (GIRK4 also known as KCNJ5) gene are associated with primary aldosteronism, which is the most common cause of secondary hypertension. The KCNJ5 rs2604204 variant was shown to be common (minor allele frequency=32.5%) in Chinese patients with essential hypertension (EH). The relationship between KCNJ5 variant and plasma aldosterone (ALD) levels in EH patients has not been reported. We collected 229 patients with newly diagnosed EH without any antihypertensive agents...
January 19, 2017: Journal of Human Hypertension
https://www.readbyqxmd.com/read/28102082/characterization-of-the-molecular-mechanisms-underlying-the-chronic-phase-of-stroke-in-a-cynomolgus-monkey-model-of-induced-cerebral-ischemia
#11
Henry C H Law, Samuel S W Szeto, Quan Quan, Yun Zhao, Zaijun Zhang, Olga Krakovska, Leong Ting Lui, Chengyou Zheng, Simon Ming Yuen Lee, K W Michael Siu, Yuqiang Wang, Ivan K Chu
Stroke is one of the main causes of mortality and long-term disability worldwide. The pathophysiological mechanisms underlying this disease are not well understood, particularly in the chronic phase after the initial ischemic episode. In this study, a Macaca fascicularis stroke model consisting of two sample groups, as determined by MRI-quantified infarct volumes as a measure of the stroke severity 28 days after the ischemic episode, was evaluated using qualitative and quantitative proteomics analyses. By using multiple online multidimensional liquid chromatography platforms, 8790 non-redundant proteins that condensed to 5223 protein groups at 1% global false discovery rate (FDR)...
January 19, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28102011/local-myogenic-pulp-derived-cell-injection-enhances-craniofacial-muscle-regeneration-in-vivo
#12
J E Jung, M J Song, S Shin, Y J Choi, K H Kim, C J Chung
OBJECTIVES: To enhance myogenic differentiation in pulp cells isolated from extracted premolars by epigenetic modification using a DNA demethylation agent, 5-aza-2'-deoxycytidine (5-Aza), and to evaluate the potent stimulatory effect of 5-Aza-treated pulp cell injection for craniofacial muscle regeneration in vivo. SETTING AND SAMPLE POPULATION: Pulp cells were isolated from premolars extracted for orthodontic purposes from four adults (age range, 18-22.1 years)...
February 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28101967/host-related-factors-explaining-interindividual-variability-of-carotenoid-bioavailability-and-tissue-concentrations-in-humans
#13
Torsten Bohn, Charles Desmarchelier, Lars O Dragsted, Charlotte S Nielsen, Wilhelm Stahl, Ralph Rühl, Jaap Keijer, Patrick Borel
Carotenoid dietary intake and their endogenous levels have been associated with a decreased risk of several chronic diseases. There are indications that carotenoid bioavailability depends, in addition to the food matrix, on host factors. These include diseases (e.g. colitis), life-style habits (e.g. smoking), gender and age, as well as genetic variations including single nucleotide polymorphisms that govern carotenoid metabolism. These are expected to explain interindividual differences that contribute to carotenoid uptake, distribution, metabolism and excretion, and therefore possibly also their association with disease risk...
January 19, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28101885/what-is-the-true-in%C3%A2-vitro-potency-of-oxytetracycline-for-the-pig-pneumonia-pathogens-actinobacillus-pleuropneumoniae-and-pasteurella-multocida
#14
L Dorey, S Hobson, P Lees
The pharmacodynamics of oxytetracycline was determined for pig respiratory tract pathogens, Actinobacillus pleuropneumoniae and Pasteurella multocida. Indices of potency were determined for the following: (i) two matrices, broth and pig serum; (ii) five overlapping sets of twofold dilutions; and (iii) a high strength starting culture. For A. pleuropneumoniae, minimum inhibitory concentration (MIC) was similar for the two matrices, but for P. multocida, differences were marked and significantly different. MIC and minimum bactericidal concentration (MBC) serum: broth ratios for A...
January 18, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28101871/recombinant-structural-proteins-and-their-use-in-future-materials
#15
Tara D Sutherland, Trevor D Rapson, Mickey G Huson, Jeffrey S Church
Recombinant proteins are polymers that offer the materials engineer absolute control over chain length and composition: key attributes required for design of advanced polymeric materials. Through this control, these polymers can be encoded to contain information that enables them to respond as the environment changes. However, despite their promise, protein-based materials are under-represented in materials science. In this chapter we investigate why this is and describe recent efforts to address this. We discuss constraints limiting rational design of structural proteins for advanced materials; advantages and disadvantages of different recombinant expression platforms; and, methods to fabricate proteins into solid-state materials...
2017: Sub-cellular Biochemistry
https://www.readbyqxmd.com/read/28101851/importance-of-radioactive-labelling-to-elucidate-inositol-polyphosphate-signalling
#16
REVIEW
Miranda S C Wilson, Adolfo Saiardi
Inositol polyphosphates, in their water-soluble or lipid-bound forms, represent a large and multifaceted family of signalling molecules. Some inositol polyphosphates are well recognised as defining important signal transduction pathways, as in the case of the calcium release factor Ins(1,4,5)P3, generated by receptor activation-induced hydrolysis of the lipid PtdIns(4,5)P2 by phospholipase C. The birth of inositol polyphosphate research would not have occurred without the use of radioactive phosphate tracers that enabled the discovery of the "PI response"...
February 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28101825/neurosarcoidosis-clinical-presentations-and-changing-treatment-patterns-in-an-irish-caucasian-population
#17
K O'Connell, L Williams, J Jones, D J H McCabe, D Murphy, R Killeen, N Tubridy, S O'Riordan, C McGuigan
BACKGROUND: The clinical manifestations of neurosarcoidosis are highly variable and it should be considered as a potential differential diagnosis in any neurological presentation. AIM: This study was designed to describe the clinical, diagnostic, and treatment patterns and functional outcome in a Caucasian neurosarcoidosis population. DESIGN: A retrospective analysis was performed on prospectively recorded data in patients attending our neurology clinic between 2008 and 2014 with a diagnosis of definite or probable neurosarcoidosis according to Zajiek criteria...
January 18, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28101737/spatholobus-suberectus-dunn-constituents-inhibit-sortase-a-and-staphylococcus-aureus-cell-clumping-to-fibrinogen
#18
Hyunjoo Cho, Beomkoo Chung, Chang-Kwon Kim, Dong-Chan Oh, Ki-Bong Oh, Jongheon Shin
Sortases are a family of Gram-positive transpeptidases responsible for anchoring surface protein virulence factors to the peptidoglycan cell wall layer. In Staphylococcus aureus (S. aureus), deletion of sortase isoform results in a significant reduction in virulence and infection potential. Twenty flavonoids were isolated from the stem of the folk medicinal plant Spatholobus suberectus Dunn. These compounds were tested against S. aureus-derived sortase A (SrtA), a key transpeptidase for bacterial virulence...
January 18, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28101643/polymorphisms-in-genes-encoding-mir-155-and-mir-146a-are-associated-with-protection-to-type-1-diabetes-mellitus
#19
Taís S Assmann, Guilherme C K Duarte, Letícia A Brondani, Pedro H O de Freitas, Égina M Martins, Luís H Canani, Daisy Crispim
AIMS: Type 1 diabetes mellitus (T1DM) is characterized by severe autoimmune destruction of pancreatic beta-cells. The triggering of autoimmunity against beta-cells is probably caused by a combination of environmental and genetic risk factors. Even though much is known about the genetic of T1DM, more information is needed to completely unravel this tangled disease. MicroRNAs (miRNAs) are a class of small noncoding RNAs molecules that negatively regulate gene expression by inducing target mRNA cleavage or by inhibiting protein translation...
January 19, 2017: Acta Diabetologica
https://www.readbyqxmd.com/read/28101612/abolishment-of-n-glycan-mannosylphosphorylation-in-glyco-engineered-saccharomyces-cerevisiae-by-double-disruption-of-mnn4-and-mnn14-genes
#20
Yeong Hun Kim, Ji-Yeon Kang, Jin Young Gil, Sang-Yoon Kim, Keun Koo Shin, Hyun Ah Kang, Jeong-Yoon Kim, Ohsuk Kwon, Doo-Byoung Oh
Mannosylphosphorylated glycans are found only in fungi, including yeast, and the elimination of mannosylphosphates from glycans is a prerequisite for yeast glyco-engineering to produce human-compatible glycoproteins. In Saccharomyces cerevisiae, MNN4 and MNN6 genes are known to play roles in mannosylphosphorylation, but disruption of these genes does not completely remove the mannosylphosphates in N-glycans. This study was performed to find unknown key gene(s) involved in N-glycan mannosylphosphorylation in S...
January 18, 2017: Applied Microbiology and Biotechnology
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