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https://www.readbyqxmd.com/read/28634367/proteomic-analysis-reveals-large-amounts-of-decomposition-enzymes-and-major-metabolic-pathways-involved-in-algicidal-process-of-trametes-versicolor-f21a
#1
Xueyan Gao, Congyan Wang, Wei Dai, Shenrong Ren, Fang Tao, Xingbing He, Guomin Han, Wei Wang
A recent algicidal mode indicates that fungal mycelia can wrap and eliminate almost all co-cultivated algal cells within a short time span. However, the underlying molecular mechanism is rarely understood. We applied proteomic analysis to investigate the algicidal process of Trametes versicolor F21a and identified 3,754 fungal proteins. Of these, 30 fungal enzymes with endo- or exoglycosidase activities such as β-1,3-glucanase, α-galactosidase, α-glucosidase, alginate lyase and chondroitin lyase were significantly up-regulated...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633971/manganese-enhanced-magnetic-resonance-imaging-depicts-brain-activity-in-models-of-acute-and-chronic-pain-a-new-window-to-study-experimental-spontaneous-pain
#2
I M Devonshire, J J Burston, L Xu, A Lillywhite, M J Prior, D J G Watson, C M Greenspon, S J Iwabuchi, D P Auer, V Chapman
Application of functional imaging techniques to animal models is vital to understand pain mechanisms, but is often confounded by the need to limit movement artefacts with anaesthesia, and a focus on evoked responses rather than clinically relevant spontaneous pain and related hyperalgesia. The aim of the present study was to investigate the potential of manganese-enhanced magnetic resonance imaging (MEMRI) to measure neural responses during on-going pain that underpins hyperalgesia in pre-clinical models of nociception...
June 17, 2017: NeuroImage
https://www.readbyqxmd.com/read/28633293/the-tonoplast-localized-transporter-mtp8-2-contributes-to-manganese-detoxification-in-the-shoots-and-roots-of-oryza-sativa-l
#3
Yuma Takemoto, Yuta Tsunemitsu, Miho Fujii-Kashino, Namiki Mitani-Ueno, Naoki Yamaji, Jian Feng Ma, Shin-Ichiro Kato, Kozo Iwasaki, Daisei Ueno
Manganese (Mn) cation diffusion facilitators (Mn-CDFs) play important roles in the Mn homeostasis of plants. In rice, the tonoplast-localized Mn-CDF metal tolerance protein 8.1 (MTP8.1) is involved in Mn detoxification in the shoots. This study functionally characterized the Mn-CDF MTP8.2 and determined its contribution to Mn tolerance. MTP8.2 was found to share 68% identity with MTP8.1 and was expressed in both the shoots and roots, but its transcription level was lower than that of MTP8.1. Transient expression of the MTP8...
June 13, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28632391/transfer-hydrogenation-of-carbonyl-derivatives-catalyzed-by-an-inexpensive-phosphine-free-manganese-precatalyst
#4
Antoine Bruneau-Voisine, Ding Wang, Vincent Dorcet, Thierry Roisnel, Christophe Darcel, Jean-Baptiste Sortais
A very simple and inexpensive catalytic system based on abundant manganese as transition metal and on an inexpensive phosphine-free bidendate ligand, 2-(aminomethyl)pyridine, has been developed for the reduction of a large variety of carbonyl derivatives with 2-propanol as hydrogen donor. Remarkably, the reaction proceeds at room temperature with low catalyst loading (down to 0.1 mol %) and exhibits a good tolerance toward functional groups. High TON (2000) and TOF (3600 h(-1)) were obtained.
June 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28631370/microbial-manganese-iii-reduction-fueled-by-anaerobic-acetate-oxidation
#5
Nadia Szeinbaum, Hui Lin, Jay A Brandes, Martial Taillefert, Jennifer B Glass, Thomas J DiChristina
Soluble manganese in the intermediate +III oxidation state (Mn(3+) ) is a newly identified oxidant in anoxic environments, whereas acetate is a naturally abundant substrate that fuels microbial activity. Microbial populations coupling anaerobic acetate oxidation to Mn(3+) reduction, however, have yet to be identified. We isolated a Shewanella strain capable of oxidizing acetate anaerobically with Mn(3+) as the electron acceptor, and confirmed this phenotype in other strains,. This metabolic connection between acetate and soluble Mn(3+) represents a new biogeochemical link between carbon and manganese cycles...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28630124/the-dna-repair-repertoire-of-mycobacterium-smegmatis-fena-includes-the-incision-of-dna-5-flaps-and-the-removal-of-5-adenylylated-products-of-aborted-nick-ligation
#6
Maria Loressa Uson, Shreya Ghosh, Stewart Shuman
We characterize Mycobacterium smegmatis FenA as a manganese-dependent 5' -flap endonuclease homologous to the 5' -exonuclease of DNA polymerase I. FenA incises a nicked 5' flap between the first and second nucleotides of the duplex segment to yield a 1-nucleotide gapped DNA, which is then further resected in dinucleotide steps. Initial FenA cleavage at a Y-flap or nick occurs between the first and second nucleotides of the duplex. However, when the template 3' -single-strand is eliminated to create a 5' -tailed duplex, FenA incision shifts to between the second and third nucleotides...
June 19, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28629722/the-manganese-efflux-system-mnte-contributes-to-the-virulence-of-streptococcus-suis-serotype-2
#7
Jiali Xu, Chengkun Zheng, Manman Cao, Ting Zeng, Xigong Zhao, Guolin Shi, Huanchun Chen, Weicheng Bei
Manganese is an essential micronutrient to bacteria and plays an important role in bacterial physiology. However, an excess of manganese is extremely deleterious to the cell. The manganese efflux system is used to control intracellular manganese levels by some bacteria. In this study, we have identified a cation efflux family protein (MntE) that functions as a manganese export system in Streptococcus suis serotype 2. To investigate the role of mntE in S. suis 2, a mntE deletion mutant (ΔmntE) and the corresponding complementation strain (CΔmntE) were constructed...
June 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28629207/h2o2-as-a-candidate-bottleneck-for-mnp-activity-during-cultivation-of-agaricus-bisporus-in-compost
#8
Aurin M Vos, Edita Jurak, Jordi F Pelkmans, Koen Herman, Gill Pels, Johan J Baars, Ed Hendrix, Mirjam A Kabel, Luis G Lugones, Han A B Wösten
Degradation of lignin by fungi enhances availability of cellulose and hemicellulose in plant waste and thereby increases the amount of carbon source available to these microorganisms. The button mushroom Agaricus bisporus degrades only about half of the lignin in compost and about 40% of the carbohydrates remain unutilized during mushroom cultivation. Here it was assessed whether over-expression of the manganese peroxidase gene mnp1 improves lignin degradation and, as a consequence, carbohydrate breakdown by A...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28628321/manganese-catalyzed-aminomethylation-of-aromatic-compounds-with-methanol-as-a-sustainable-c1-building-block
#9
Matthias Mastalir, Ernst Pittenauer, Günter Allmaier, Karl Kirchner
This study represents the first example of a manganese-catalyzed environmentally benign, practical three-component aminomethylation of activated aromatic compounds including naphtols, phenols, pyridines, indoles, carbazoles, and thiophenes in combination with amines and MeOH as a C1 source. These reactions proceed with high atom efficiency via a sequence of dehydrogenation and condensation steps which give rise to selective C-C and C-N bond formations, thereby releasing hydrogen and water. A well-defined hydride Mn(I) PNP pincer complex, recently developed in our laboratory, catalyzes this process in a very efficient way, and a total of 28 different aminomethylated products were synthesized and isolated yields of up to 91%...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28627568/synthesis-and-temperature-dependent-studies-of-a-perovskite-like-manganese-formate-framework-templated-with-protonated-acetamidine
#10
Mirosław Mączka, Jan Janczak, Monika Trzebiatowska, Adam Sieradzki, Sebastian Pawlus, Adam Pikul
We report the synthesis, crystal structure, thermal, dielectric, phonon and magnetic properties of the [CH3C(NH2)2][Mn(HCOO)3] (AceMn) compound. Our results show that this compound crystallizes in the perovskite-like orthorhombic structure, space group Imma. It undergoes a structural phase transition at 304 K into a monoclinic structure, space group P21/n. X-ray diffraction, dielectric, IR and Raman studies show that the ordering of the acetamidinium cations triggers the phase transition. Low-temperature magnetic studies show that this compound exhibits weak ferromagnetic properties below 9...
June 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28624528/derivation-of-an-occupational-exposure-level-for-manganese-in-welding-fumes
#11
Lisa A Bailey, Laura E Kerper, Julie E Goodman
Exposure to high levels of manganese (Mn) in occupational settings is known to lead to adverse neurological effects. Since Mn is an essential nutrient, there are mechanisms that maintain its homeostatic control in the body, and there is some level of Mn in air that does not perturb Mn homeostasis. However, the Mn exposure concentrations at which no adverse effects are expected in occupational settings vary considerably across regulatory agencies. We set out to derive a Mn Occupational Exposure Level (OEL) for welders based on a review of studies that evaluated Mn exposure concentrations from welding fumes and: (1) neurological effects in welders; (2) levels of Mn in the brains of welders (via pallidal index [PI] estimated from magnetic resonance imaging [MRI]); (3) other biomarkers of Mn exposure in welders (i...
June 14, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28624420/biophysical-characterization-and-thermal-stability-of-pneumococcal-histidine-triad-protein-d-phtd-in-the-presence-of-zinc-and-manganese
#12
Salvador F Ausar, Kavisha Jayasundara, Lamees Akawi, Cristopher Roque, Anthony Sheung, Jian Hu, Marina Kirkitadze, Nausheen Rahman
The Pneumococcal Histidine Triad Protein D (PhtD) is believed to play a central role in pneumococcal metal ion homeostasis and has been proposed as a promising vaccine candidate against pneumococcal disease. To investigate for potential stabilizers, a panel of physiologically relevant metals was screened using the thermal shift assay and it was found that only Zn(2+) and Mn(2+) were able to increase PhtD melting temperature. Differential Scanning Calorimetry (DSC) analysis revealed a sequential unfolding of PhtD and the presence of at least 3 independent folding domains that can be stabilized by Zn(2+) and Mn(2+)...
June 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28623771/liquid-electrode-plasma-optical-emission-spectrometry-combined-with-solid-phase-preconcentration-for-on-site-analysis-of-lead
#13
Suman Barua, Ismail M M Rahman, Iftakharul Alam, Maho Miyaguchi, Hikaru Sawai, Teruya Maki, Hiroshi Hasegawa
A relatively rapid and precise method is presented for the determination of lead in aqueous matrix. The method consists of analyte quantitation using the liquid electrode plasma-optical emission spectrometry (LEP-OES) coupled with selective separation/preconcentration by solid-phase extraction (SPE). The impact of operating variables on the retention of lead in SPEs such as pH, flow rate of the sample solution; type, volume, flow rate of the eluent; and matrix effects were investigated. Selective SPE-separation/preconcentration minimized the interfering effect due to manganese in solution and limitations in lead-detection in low-concentration samples by LEP-OES...
June 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28623313/inhibition-of-calpains-protects-mn-induced-neurotransmitter-release-disorders-in-synaptosomes-from-mice-involvement-of-snare-complex-and-synaptic-vesicle-fusion
#14
Can Wang, Bin Xu, Zhuo Ma, Chang Liu, Yu Deng, Wei Liu, Zhao-Fa Xu
Overexposure to manganese (Mn) could disrupt neurotransmitter release via influencing the formation of SNARE complex, but the underlying mechanisms are still unclear. A previous study demonstrated that SNAP-25 is one of substrate of calpains. The current study investigated whether calpains were involved in Mn-induced disorder of SNARE complex. After mice were treated with Mn for 24 days, Mn deposition increased significantly in basal nuclei in Mn-treated and calpeptin pre-treated groups. Behaviorally, less time spent in the center of the area and decreased average velocity significantly in an open field test after 24 days of Mn exposure...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622805/nanomolar-sensitive-colorimetric-assay-for-mn-2-using-cysteic-acid-capped-silver-nanoparticles-and-theoretical-investigation-of-its-sensing-mechanism
#15
Yan-Xia Qi, Zhi-Bei Qu, Qi-Xian Wang, Min Zhang, Guoyue Shi
A new facile, rapid, sensitive and selective colorimetric assay is proposed for the determination of manganese ions (Mn(2+)) utilizing cysteic acid (CA)-capped silver nanoparticles (CA-AgNPs) as colorimetric probes. The CA-AgNPs were prepared by reducing AgNO3 with NaBH4 in the presence of CA as the capping ligand. The presence of Mn(2+) induces the quick aggregation of CA-AgNPs, associated with notable color changes of the CA-AgNPs solution from yellow to dark green. The Mn(2+) can form a coordinated structure with CA capping on the AgNPs and leads to formation of large particles aggregation...
August 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28621829/heterogeneous-sodium-manganese-oxide-catalyzed-aerobic-oxidative-cleavage-of-1-2-diols
#16
Vincent Escande, Chun Ho Lam, Philip Coish, Paul T Anastas
The aerobic oxidative cleavage of 1,2-diols using a heterogeneous catalyst only based on earth abundant metals manganese and sodium is reported for the first time. This reusable catalyst cleaves a variety of substrates into aldehydes or ketones with high selectivity. The reaction requires small catalytic loadings and is performed under mild conditions using ambient pressure O2 or air as the oxidant while producing water as by-product. Mechanistic investigations reveal a monodentate, two-electron oxidative fragmentation process involving a MnIV species...
June 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28621606/nano-targeting-of-mucosal-addressin-cell-adhesion-molecule-1-identifies-bowel-inflammation-foci-in-murine-model
#17
Marta Truffi, Miriam Colombo, Jesus Peñaranda-Avila, Luca Sorrentino, Francesco Colombo, Matteo Monieri, Veronica Collico, Pietro Zerbi, Erika Longhi, Raffaele Allevi, Davide Prosperi, Fabio Corsi
AIM: We investigate MAdCAM-1 as a reliable target to detect active bowel inflammation for selective noninvasive nanodiagnostics. MATERIALS & METHODS: We coupled anti-MAdCAM-1 antibodies to manganese oxide nanoparticles, and analyzed nanoconjugate biodistribution and safety in murine model of inflammatory bowel disease by imaging and histology. RESULTS: Nanoparticles were stable and nontoxic. Upon administration in colitic mice, anti-MAdCAM-1 functionalized nanoparticles preferentially localized in the inflamed bowel, whereas untargeted nanoparticles were more rapidly washed out...
June 16, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28621546/application-of-a-novel-phyco-composite-biosorbent-for-biotreatment-of-aqueous-medium-polluted-with-manganese-ions
#18
Fatih Deniz, Elif Tezel Ersanli
A composite phyco-biomass including four different marine macroalgae species (Chaetomorpha sp., Polysiphonia sp., Ulva sp. and Cystoseira sp.) was evaluated as a novel biosorbent for the biosorption of manganese ions from aqueous solution. The experimental studies were performed to optimize the operational factors including solution pH, biosorbent amount, initial manganese concentration and reaction time in a batch mode biosorption system. The removal yield of the biosorbent for manganese ions increased with increasing pH, manganese ion concentration and reaction time while it decreased as the biosorbent dose increased...
June 16, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28621399/-mii-ncs-2-nia-2-oh2-2-preparation-crystal-structure-and-thermal-properties-mii-mn-fe-nia-nicotinamide
#19
Marta Počkaj, Nives Kitanovski, Boris Čeh, Romana Cerc-Korošec
Two novel isostructural coordination compounds of manganese(II) (1) and iron(II) (2) with common formulae [MII(NCS)2(nia)2(OH2)2] have been prepared from water solution of appropriate metal salt, nicotinamide and KSCN. Their crystal structures were determined by means of X-ray diffraction on single crystals. The mononuclear title compounds crystallize in a triclinic P-1 space group with six monodentate octahedrally arranged ligands around the metal centre. The coordination molecules are self-assembled with an extended network of hydrogen bonds into a three-dimensional structure...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621393/synthesis-crystal-structures-and-catalytic-oxidation-of-manganese-iii-complexes-derived-from-salen-type-schiff-base-n-n-bis-5-nitrosalicylidene-ethane-1-2-diamine
#20
Qing-Bin Li, Yong-Jun Han, Gan-Qing Zhao, Ling-Wei Xue
Two mononuclear Schiff base manganese(III) complexes, [MnL(N3)(OH2)]·CH3OH (1) and [MnL(NCS)(OH2)] · H2O (2), where L is the dianionic form of N,N'-bis(5-nitrosalicylidene)ethane-1,2-diamine, have been prepared and characterized by elemental analysis, IR and UV-Vis spectroscopy and single crystal X-ray diffraction. The Mn atom in each complex is in an octahedral coordination. Molecules of the complexes are linked through intermolecular hydrogen bonds. Catalytic properties for epoxidation of styrene by the complexes using PhIO and NaOCl as oxidant have been studied...
June 2017: Acta Chimica Slovenica
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