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https://www.readbyqxmd.com/read/29166667/flotillin-scaffold-activity-contributes-to-type-vii-secretion-system-assembly-in-staphylococcus-aureus
#1
Benjamin Mielich-Süss, Rabea M Wagner, Nicole Mietrach, Tobias Hertlein, Gabriella Marincola, Knut Ohlsen, Sebastian Geibel, Daniel Lopez
Scaffold proteins are ubiquitous chaperones that promote efficient interactions between partners of multi-enzymatic protein complexes; although they are well studied in eukaryotes, their role in prokaryotic systems is poorly understood. Bacterial membranes have functional membrane microdomains (FMM), a structure homologous to eukaryotic lipid rafts. Similar to their eukaryotic counterparts, bacterial FMM harbor a scaffold protein termed flotillin that is thought to promote interactions between proteins spatially confined to the FMM...
November 22, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29166560/analytical-challenges-and-recent-advances-in-mass-spectrometry-based-lipidomics
#2
Yepy Hardi Rustam, Gavin Edmund Reid
Although no internationally accepted consensus definition exists, lipids can be broadly defined as "fatty acids and their derivatives, and substances related biosynthetically or functionally to these compounds". Lipids play critical roles as (i) the major structural components of biological membranes, and as functional and regulatory components of membrane protein signaling, (ii) bioactive intra- and inter-cellular signaling molecules, and (iii) energy storage molecules for the maintenance of energy homeostasis...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29166454/the-clinical-genetics-of-phaeochromocytoma-and-paraganglioma
#3
P T Kavinga Gunawardane, Ashley Grossman
Phaeochromocytoma and paraganglioma are rare catecholamine-producing tumours, recognised to have one of the richest hereditary backgrounds of all neoplasms, with germline mutations seen in approximately 30% of patients. They can be a part of genetic syndromes such as MEN 2 or Neurofibromatosis type 1, or can be found as apparently sporadic tumours. Germline mutations are almost always found in syndromic patients. Nonetheless, apparently sporadic phaeochromocytoma too show high germline mutation rates. Early detection of a genetic mutation can lead to early diagnosis of further tumours via surveillance, early treatment and better prognosis...
October 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29166453/biochemical-diagnosis-of-acromegaly-without-a-typical-clinical-phenotype-what-are-the-concerns
#4
EDITORIAL
Antonio Ribeiro-Oliveira, Ariel Barkan
No abstract text is available yet for this article.
October 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29166430/aquaculture-biological-waste-as-culture-medium-to-cultivation-of-ankistrodesmus-gracilis-reinsch-korshikov
#5
L H Sipaúba-Tavares, T Florêncio, B Scardoeli-Truzzi
Current study investigated the effectiveness of different macrophytes as culture media for Ankistrodesmus gracilis in laboratory conditions. Significant difference (p < 0.05) was reported in cell density with regard to conventional culture medium (CHU12) and macrophytes culture media. Mean cell density in NPK, Eichhornia crassipes and E. azurea media was higher (p < 0.05) than in conventional culture medium. Chlorophyll-a was higher than 1 g.L-1, except in CHU12 (0.7 ± 0.4 g.L-1) and T. domingensis (0...
November 21, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/29166271/beta-hydroxybutyrate-in-milk-as-screening-test-for-subclinical-ketosis-in-dairy-cows
#6
J Ježek, M R Cincović, M Nemec, B Belić, R Djoković, M Klinkon, J Starič
Ketosis is a very frequent metabolic disease in dairy cows, resulting in lower milk production, impaired fertility and increased frequency of other diseases. The course of the disease is often subclinical, so early detection is very important. The aim of the study was to investigate the relation between the concentration of beta-hydroxybutyrate in blood and milk and to determine the cut-off value in milk for detection of subclinical ketosis. The study included 94 cows, which were in the first third of lactation...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29166264/relationship-between-ph-of-ruminal-fluid-during-subacute-ruminal-acidosis-and-physiological-response-of-the-polish-holstein-friesian-dairy-cows
#7
B Stefańska, E Pruszyńska-Oszmałek, D Szczepankiewicz, K Stajek, P Stefański, M Gehrke, W Nowak
The aim of the study was to investigate the effect of ruminal fluid pH depression on biochemical indices of blood, urine, feces, and milk, and to determine which of them may be helpful as a marker for the diagnosis of subacute ruminal acidosis (SARA). Ruminal fluid samples were obtained by rumenocentesis from 305 cows representing 13 commercial dairy herds. The herds were selected based on percentages of cows with an assigned value of ruminal fluid pH segregated into three groups as: SARA-positive herd, if at least 25% of the ruminal fluid samples indicated a pH < 5...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29166142/effects-of-dose-escalated-radiotherapy-in-combination-with-long-term-androgen-deprivation-on-prostate-cancer
#8
Natsuo Tomita, Norihito Soga, Yuji Ogura, Jun Furusawa, Hidetoshi Shimizu, Sou Adachi, Hiroshi Tanaka, Daiki Kato, Yutaro Koide, Chiyoko Makita, Hiroyuki Tachibana, Takeshi Kodaira
OBJECTIVE: We aimed to examine the effects of a dose escalation for prostate cancer patients receiving long-term androgen deprivation therapy (ADT). METHODS: A retrospective analysis of 605 patients treated with radiotherapy and long-term ADT (National Comprehensive Cancer Network criteria-defined intermediate-risk; minimum 10 months, high-risk and very-high-risk; minimum 20 months) was performed. The median ADT time was 31 months. Cox's proportional-hazards models were used to compare biochemical disease-free survival (bDFS), clinical relapse-free survival (cRFS), and overall survival (OS) between the ≥ 70, < 78 Gy group and 78 Gy group in a univariate analysis and to assess the effects of the dose escalation on bDFS in a multivariate analysis...
November 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29166083/water-structure-around-hydrophobic-amino-acid-side-chain-analogs-using-different-water-models
#9
Timir Hajari, Sanjoy Bandyopadhyay
The water structure around hydrophobic groups governs various biochemical processes. There is an ongoing debate on whether water molecules near hydrophobic groups are more ordered with greater participation in water-water hydrogen bonding with respect to water in the pure bulk state. The water structure around six different hydrophobic amino acid side chain analog molecules has been studied in pure water using molecular dynamics simulations. The analysis of water tetrahedral order parameter and the number of hydrogen bonds formed by the individual water molecules in the first hydration shell of the hydrophobic analogs provide evidence that both ordering and hydrogen bonds involving water molecules are to some extent reduced in the hydrophobic hydration shell...
June 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166018/discovery-of-small-molecule-inhibitors-of-ubiquitin-specific-protease-7-usp7-using-integrated-nmr-and-in-silico-techniques
#10
Paola Di Lello, Richard Pastor, Jeremy M Murray, Robert A Blake, Frederick Cohen, Terry D Crawford, Joy Drobnick, Jason Drummond, Lorna Kategaya, Tracy Kleinheinz, Till Maurer, Lionel Rouge, Xianrui Zhao, Ingrid Wertz, Chudi Ndubaku, Vickie Tsui
USP7 is a deubiquitinase implicated in destabilizing the tumor suppressor p53 and for this reason it has gained increasing attention as a potential oncology target for small molecule inhibitors. Herein we describe the biophysical, biochemical and computational approaches that led to the identification of 4-(2-aminopyridin-3-yl)-phenol compounds described by Kategaya et al.1 as specific inhibitors of USP7. Fragment based lead discovery (FBLD) by NMR combined with virtual screening and re-mining of biochemical high-throughput screening (HTS) hits led to the discovery of a series of ligands that bind in the "palm" region of the catalytic domain of USP7 and inhibit its catalytic activity...
November 22, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29166001/a-redox-role-for-the-4fe4s-cluster-of-yeast-dna-polymerase-%C3%AE
#11
Phillip L Bartels, Joseph L Stodola, Peter M J Burgers, Jacqueline K Barton
A [4Fe4S]2+ cluster in the C-terminal domain of the catalytic subunit of the eukaryotic B-family DNA polymerases is essential for the formation of active multi-subunit complexes. Here we use a combination of electrochemical and biochemical methods to assess the redox activity of the [4Fe4S]2+ cluster in Saccharomyces cerevisiae polymerase (Pol) δ, the lagging strand DNA polymerase. We find that Pol δ bound to DNA is indeed redox-active at physiological potentials, generating a DNA-mediated signal electrochemically with a midpoint potential of 113 ± 5 mV versus NHE...
November 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29165850/the-tcp4-transcription-factor-regulates-trichome-cell-differentiation-by-directly-activating-glabrous-inflorescence-stems-in-arabidopsis-thaliana
#12
B Vijaya Lakshmi Vadde, Krishna Reddy Challa, Utpal Nath
Trichomes are the first cell type to be differentiated during the morphogenesis of leaf epidermis and serve as an ideal model to study cellular differentiation. A large number of genes involved in the patterning and differentiation of trichome cells have been studied over past decades, and the majority of these genes encode transcription factors that specifically regulate epidermal cell development. However, the upstream regulators of these genes that link early leaf morphogenesis with cell type differentiation are less studied...
November 22, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29165820/nutrient-limitation-of-terrestrial-free-living-nitrogen-fixation
#13
Katherine A Dynarski, Benjamin Z Houlton
Nitrogen (N) fixation by free-living bacteria is a primary N input pathway in many ecosystems and sustains global plant productivity. Uncertainty exists over the importance of N, phosphorus (P) and molybdenum (Mo) availability in controlling free-living N fixation rates. Here, we investigate the geographic occurrence and variability of nutrient constraints to free-living N fixation in the terrestrial biosphere. We compiled data from studies measuring free-living N fixation in response to N, P and Mo fertilizers...
November 22, 2017: New Phytologist
https://www.readbyqxmd.com/read/29165766/clinical-analysis-of-59-children-with-hand-foot-and-mouth-diseases-due-to-enterovirus-ev71-and-concomitant-viral-encephalitis
#14
M-G Wang, H-M Sun, X-M Liu, X-Q Deng
OBJECTIVE: To analyzed the clinical features of children with HFMD and viral encephalitis and to summarize some treatments. PATIENTS AND METHODS: A total of 59 children with HFMD were included in this study. All children underwent complete blood count, blood biochemical test cerebrospinal fluid examination, chest X-ray and brain MRI. RESULTS: One child died 24 hours after admission due to central respiratory failure with myocardial damage...
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29165709/structural-basis-for-the-gtp-specificity-of-the-rna-kinase-domain-of-fungal-trna-ligase
#15
Barbara S Remus, Yehuda Goldgur, Stewart Shuman
Fungal tRNA ligase (Trl1) is an essential enzyme that repairs RNA breaks with 2',3'-cyclic-PO4 and 5'-OH ends inflicted during tRNA splicing and non-canonical mRNA splicing in the fungal unfolded protein response. Trl1 is composed of C-terminal cyclic phosphodiesterase and central polynucleotide kinase domains that heal the broken ends to generate the 3'-OH,2'-PO4 and 5'-PO4 termini required for sealing by an N-terminal ligase domain. Trl1 enzymes are found in all human fungal pathogens and are promising targets for antifungal drug discovery because their domain compositions and biochemical mechanisms are unique compared to the mammalian RtcB-type tRNA splicing enzyme...
November 20, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29165604/carbapenemase-producing-organisms-a-global-scourge
#16
Robert A Bonomo, Eileen M Burd, John Conly, Brandi M Limbago, Laurent Poirel, Julie A Segre, Lars F Westblade
The dramatic increase in the prevalence and clinical impact of infections caused by bacteria producing carbapenemases is a global health concern. Carbapenemase production is especially problematic when encountered in members of the family Enterobacteriaceae. Due to their ability to readily spread and colonize patients in health care environments, preventing the transmission of these organisms is a major public health initiative and coordinated international effort is needed to contain the risk of infection...
October 16, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29165595/con-the-role-of-diet-for-people-with-advanced-stage-5-ckd
#17
Graham Woodrow
Restriction of dietary protein intake has been used in the management of chronic kidney disease (CKD) for many decades, yet remains controversial, with marked variations in its application in clinical practice. There is extensive literature on the subject, with some expert opinion advocating the use of protein restriction based on the balance of the available evidence. The largest randomized trial of low-protein diets is the Modification of Diet in Renal Disease study. Despite multiple secondary analyses, the essential intention-to-treat analysis failed to demonstrate a benefit in the primary outcome of rate of decline of glomerular filtration rate...
November 17, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29165520/-neisseria-subflava-bacteremia-in-newborns-case-report-and-review-of-the-literature
#18
M Carolina Rivacoba, Giannina Izquierdo, Natalia Zenteno, Lorena Porte
Neisseria subflava belongs to Neisseriaceae family, is considered a comensal specie, however in certain host, mainly inmunosuppresed patientes and children, the literature has documented invasive infections. We present a case of a bacteriemia due to N. subflava in a newborn, treated with cefotaxime with good outcome. In newborns, the most common Neisseria bacteria to cause invasive infections are N. meningitidis, with highly fatal clinical course and N. gonorrhoeae which compromise the eye, oftalmia neonatorum, with uncommon invasive infections...
August 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/29165427/sphingolipids-and-their-metabolism-in-physiology-and-disease
#19
REVIEW
Yusuf A Hannun, Lina M Obeid
Studies of bioactive lipids in general and sphingolipids in particular have intensified over the past several years, revealing an unprecedented and unanticipated complexity of the lipidome and its many functions, which rivals, if not exceeds, that of the genome or proteome. These results highlight critical roles for bioactive sphingolipids in most, if not all, major cell biological responses, including all major cell signalling pathways, and they link sphingolipid metabolism to key human diseases. Nevertheless, the fairly nascent field of bioactive sphingolipids still faces challenges in its biochemical and molecular underpinnings, including defining the molecular mechanisms of pathway and enzyme regulation, the study of lipid-protein interactions and the development of cellular probes, suitable biomarkers and therapeutic approaches...
November 22, 2017: Nature Reviews. Molecular Cell Biology
https://www.readbyqxmd.com/read/29165318/unidirectional-bmp2-loaded-collagen-scaffolds-induce-chondrogenic-differentiation
#20
Michiel W Pot, Laurie M G de Kroon, Peter M van der Kraan, Toin H van Kuppevelt, Willeke F Daamen
Microfracture surgery may be improved by the implantation of unidirectional collagen scaffolds that provide a template for mesenchymal stem cells to regenerate cartilage. Incorporation of growth factors in unidirectional scaffolds may further enhance cartilage regeneration. In scaffolds, immobilization of growth factors is required to prolong in vivo activity, to limit diffusion and to reduce the amount of growth factor needed for safe clinical application. We investigated the immobilization of bone morphogenetic protein 2 (BMP2) to unidirectional collagen scaffolds and the effect on in vitro chondrogenesis...
November 22, 2017: Biomedical Materials
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