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https://www.readbyqxmd.com/read/29669166/homologs-from-sulfur-oxidation-sox-and-methanol-dehydrogenation-xox-enzyme-systems-collaborate-to-give-rise-to-a-novel-pathway-of-chemolithotrophic-tetrathionate-oxidation
#1
Prosenjit Pyne, Masrure Alam, Moidu Jameela Rameez, Subhrangshu Mandal, Abhijit Sar, Nibendu Mondal, Utsab Debnath, Boby Mathew, Anup Kumar Misra, Amit Kumar Mandal, Wriddhiman Ghosh
The SoxXAYZB(CD)2 -mediated pathway of bacterial sulfur-chemolithotrophy explains the oxidation of thiosulfate, sulfide, sulfur and sulfite, but not tetrathionate. Advenella kashmirensis, which oxidizes tetrathionate to sulfate, besides forming it as an intermediate during thiosulfate-oxidation, possesses a soxCDYZAXOB operon. Knock-out-mutations proved that only SoxBCD is involved in A. kashmirensis tetrathionate-oxidation, whereas thiosulfate-to-tetrathionate-conversion is Sox-independent. Expression of two glutathione-metabolism-related proteins increased under chemolithotrophic conditions, as compared to the chemoorganotrophic one...
April 18, 2018: Molecular Microbiology
https://www.readbyqxmd.com/read/29611541/nanocurcumin-pyrroloquinoline-formulation-prevents-hypertrophy-induced-pathological-damage-by-relieving-mitochondrial-stress-in-cardiomyocytes-under-hypoxic-conditions
#2
Sarita Nehra, Varun Bhardwaj, Anju Bansal, Pronobesh Chattopadhyay, Deepika Saraswat
This study investigates the therapeutic effect of a nanocurcumin formulation (NCF) containing nanocurcumin (NC) and pyrroloquinoline quinone (PQQ) on ameliorating hypoxia-induced stress in hypertrophied primary human ventricular cardiomyocytes (HVCM) under hypoxic conditions, as validated in a Sprague-Dawley rat model of chronic hypobaric hypoxia (cHH)-induced right ventricular hypertrophy (RVH). Based on our previous findings, here, we analyzed the improvement in the protective efficacy of NCF against mitochondrial damage...
December 1, 2017: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29602785/the-pyrroloquinoline-quinone-dependent-pyranose-dehydrogenase-from-coprinopsis-cinerea-cc-pdh-drives-lytic-polysaccharide-monooxygenase-lpmo-action
#3
Anikó Várnai, Kiwamu Umezawa, Makoto Yoshida, Vincent G H Eijsink
Fungi secrete a set of glycoside hydrolases and oxidoreductases, including lytic polysaccharide monooxygenases (LPMOs), for the degradation of plant polysaccharides. LPMOs catalyze the oxidative cleavage of glycosidic bonds after activation by an external electron donor. So far, only flavin-dependent oxidoreductases (from the auxiliary activity family AA3) have been shown to activate LPMOs. Here we present LPMO activation by a pyrroloquinoline-quinone (PQQ)-dependent pyranose dehydrogenase (PDH) from Coprinopsis cinerea , Cc PDH, the founding member of the recently discovered auxiliary activity family AA12...
March 30, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29593571/mechanistic-role-of-reactive-oxygen-species-and-therapeutic-potential-of-antioxidants-in-denervation-or-fasting-induced-skeletal-muscle-atrophy
#4
Jiaying Qiu, Qingqing Fang, Tongtong Xu, Changyue Wu, Lai Xu, Lingbin Wang, Xiaoming Yang, Shu Yu, Qi Zhang, Fei Ding, Hualin Sun
Skeletal muscle atrophy occurs under various conditions, such as disuse, denervation, fasting, aging, and various diseases. Although the underlying molecular mechanisms are still not fully understood, skeletal muscle atrophy is closely associated with reactive oxygen species (ROS) overproduction. In this study, we aimed to investigate the involvement of ROS in skeletal muscle atrophy from the perspective of gene regulation, and further examine therapeutic effects of antioxidants on skeletal muscle atrophy. Microarray data showed that the gene expression of many positive regulators for ROS production were up-regulated and the gene expression of many negative regulators for ROS production were down-regulated in mouse soleus muscle atrophied by denervation (sciatic nerve injury)...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29575679/contrasting-p-acquisition-strategies-of-the-bacterial-communities-associated-with-legume-and-grass-in-subtropical-orchard-soil
#5
Yang Zhou, Honghui Zhu, Qing Yao
Phosphorus (P) cycling is a fundamental process driven by microorganisms, and plants can regulate P cycling directly or via their influence on the soil microbial community. However, the differential P cycling patterns associated with legumes and grass are largely unknown. Therefore, we investigated the microbial community involved in P cycling in subtropical soil grown with stylo (Stylosanthes guianensis, legume) or bahiagrass (Paspalum notatum, grass) using metagenomic sequencing. P fractionation indicated that sparingly soluble inorganic P (Pi) accounted for approximately 75% of P pool...
March 24, 2018: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29568949/pyrroloquinoline-quinone-induces-chondrosarcoma-cell-apoptosis-by-increasing-intracellular-reactive-oxygen-species
#6
Linchun Wen, Xiyan Lu, Rui Wang, Xiaowei Jin, Liqiang Hu, Chuanwen You
Pyrroloquinoline quinone (PQQ) has been reported to contribute to cancer cell apoptosis and death; however, little is known of its underlying mechanisms. The present study was designed to investigate the role of PQQ in chondrosarcoma cell apoptosis and the underlying mechanism. A cell cytotoxicity assay was used to detect cell death; flow cytometry analysis was also performed to determine cell apoptosis and intracellular reactive oxygen species (ROS). Biochemical methods were employed to detect the activity and the expression of superoxide dismutase (SOD)1, SOD2 and glutathione...
March 14, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29507905/pyrroloquinoline-quinone-prevents-developmental-programming-of-microbial-dysbiosis-and-macrophage-polarization-to-attenuate-liver-fibrosis-in-offspring-of-obese-mice
#7
Jacob E Friedman, Evgenia Dobrinskikh, Alba Alfonso-Garcia, Alexander Fast, Rachel C Janssen, Taylor K Soderborg, Aimee L Anderson, Julie A Reisz, Angelo D'Alessandro, Daniel N Frank, Charles E Robertson, Becky A de la Houssaye, Linda K Johnson, David J Orlicky, Xiaoxin X Wang, Moshe Levi, Eric O Potma, Karim C El Kasmi, Karen R Jonscher
Increasingly, evidence suggests that exposure to maternal obesity creates an inflammatory environment in utero , exerting long-lasting postnatal signatures on the juvenile innate immune system and microbiome that may predispose offspring to development of fatty liver disease. We found that exposure to a maternal Western-style diet (WD) accelerated fibrogenesis in the liver of offspring and was associated with early recruitment of proinflammatory macrophages at 8-12 weeks and microbial dysbiosis as early as 3 weeks of age...
March 2018: Hepatology Communications
https://www.readbyqxmd.com/read/29492864/the-crystal-structure-of-methanol-dehydrogenase-a-quinoprotein-from-the-marine-methylotrophic-bacterium-methylophaga-aminisulfidivorans-mp-t
#8
Thinh-Phat Cao, Jin Myung Choi, Si Wouk Kim, Sung Haeng Lee
The first crystal structure of a pyrroloquinoline quinone (PQQ)-dependent methanol dehydrogenase (MDH) from a marine methylotrophic bacterium, Methylophaga aminisulfidivorans MPT (MDHMas ), was determined at 1.7 Å resolution. The active form of MDHMas (or MDHIMas) is a heterotetrameric α2 β2 , where each β-subunit assembles on one side of each of the α-subunits, in a symmetrical fashion, so that two β-subunits surround the two PQQ-binding pockets on the α-subunits. The active site consists of a PQQ molecule surrounded by a β-propeller fold for each α-subunit...
February 28, 2018: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/29468297/aldopentoses-as-new-substrates-for-the-membrane-bound-pyrroloquinoline-quinone-dependent-glycerol-polyol-dehydrogenase-of-gluconobacter-sp
#9
Toshiharu Yakushi, Yuka Terada, Seishiro Ozaki, Naoya Kataoka, Yoshihiko Akakabe, Osao Adachi, Minenosuke Matsutani, Kazunobu Matsushita
Membrane-bound, pyrroloquinoline quinone (PQQ)-dependent glycerol dehydrogenase (GLDH, or polyol dehydrogenase) of Gluconobacter sp. oxidizes various secondary alcohols to produce the corresponding ketones, such as oxidation of D-sorbitol to L-sorbose in vitamin C production. Substrate specificity of GLDH is considered limited to secondary alcohols in the D-erythro configuration at the next to the last carbon. Here, we suggest that L-ribose, D- and L-lyxoses, and L-tagatose are also substrates of GLDH, but these sugars do not meet the substrate specificity rule of GLDH...
February 21, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29422992/pyrroloquinoline-quinone-plays-an-important-role-in-rescuing-bmi-1-mice-induced-developmental-disorders-of-teeth-and-mandible-anti-oxidant-effect-of-pyrroloquinoline-quinone
#10
Yuanqing Huang, Ning Chen, Dengshun Miao
To investigate whether pyrroloquinoline quinine (PQQ) plays an important role in rescuing Bmi-1-/- mice induced developmental disorders of teeth and mandible by regulating oxidative stress. We fed Bmi-1-/- mice a diet supplemented with PQQ (BKO+PQQ), BKO mice with normal diet (BKO) and wild type mice with normal diet (WT) as controls. We compared the differences of dental, mandibular phenotype by means of X-ray photography, micro CT scanning and three-dimensional reconstruction, HE staining, histochemistry, immunoistohemistry, TUNEL staining, Western blot and Flow cytometry in three groups of animals...
2018: American Journal of Translational Research
https://www.readbyqxmd.com/read/29366965/improved-heterologous-expression-of-the-membrane-bound-quinoprotein-quinate-dehydrogenase-from-gluconobacter-oxydans
#11
Toshiharu Yakushi, Kazutaka Komatsu, Minenosuke Matsutani, Naoya Kataoka, Alisa S Vangnai, Hirohide Toyama, Osao Adachi, Kazunobu Matsushita
Gluconobacter oxydans produces 3-dehydroquinate by oxidation of quinate through a reaction catalyzed by the quinate dehydrogenase (QDH), membrane-bound, pyrroloquinoline quinone (PQQ)-dependent dehydrogenase. We previously reported the nucleotide and deduced amino acid sequence of QDH and constructed a heterologous expression system of QDH in Pseudomonas sp. (A.S. Vangnai, W. Promden, W. De-Eknamkul, K. Matsushita, H. Toyama, Biochemistry (Moscow) 75:452-459, 2010). Through this study, we aim to update the sequences of QDH and improve the heterologous expression of QDH in Gluconobacter strains using a broad-host-range plasmid...
May 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29239114/engineering-thermal-stability-and-solvent-tolerance-of-the-soluble-quinoprotein-pede-from-pseudomonas-putida-kt2440-with-a-heterologous-whole-cell-screening-approach
#12
Matthias Wehrmann, Janosch Klebensberger
Due to their ability for direct electron transfer to electrodes, the utilization of rare earth metals as cofactor, and their periplasmic localization, pyrroloquinoline quinone-dependent alcohol dehydrogenases (PQQ-ADHs) represent an interesting class of biocatalysts for various biotechnological applications. For most biocatalysts protein stability is crucial, either to increase the performance of the protein under a given process condition or to maximize robustness of the protein towards mutational manipulations, which are often needed to enhance or introduce a functionality of interest...
March 2018: Microbial Biotechnology
https://www.readbyqxmd.com/read/29226074/characterization-of-auxiliary-iron-sulfur-clusters-in-a-radical-s-adenosylmethionine-enzyme-pqqe-from-methylobacterium-extorquens-am1
#13
Natsaran Saichana, Katsuyuki Tanizawa, Hiroshi Ueno, Jiří Pechoušek, Petr Novák, Jitka Frébortová
PqqE is a radical S -adenosyl-l-methionine (SAM) enzyme that catalyzes the initial reaction of pyrroloquinoline quinone (PQQ) biosynthesis. PqqE belongs to the SPASM (subtilosin/PQQ/anaerobic sulfatase/mycofactocin maturating enzymes) subfamily of the radical SAM superfamily and contains multiple Fe - S clusters. To characterize the Fe - S clusters in PqqE from Methylobacterium extorquens AM1, Cys residues conserved in the N-terminal signature motif (CX3 CX2 C) and the C-terminal seven-cysteine motif (CX9-15 GX4 CX n CX2 CX5 CX3 CX n C; n  = an unspecified number) were individually or simultaneously mutated into Ser...
December 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29220151/integration-of-enzymes-in-polyaniline-sensitized-3d-inverse-opal-tio-2-architectures-for-light-driven-biocatalysis-and-light-to-current-conversion
#14
Marc Riedel, Fred Lisdat
Inspired by natural photosynthesis, coupling of artificial light-sensitive entities with biocatalysts in a biohybrid format can result in advanced photobioelectronic systems. Herein, we report on the integration of sulfonated polyanilines (PMSA1) and PQQ-dependent glucose dehydrogenase (PQQ-GDH) into inverse opal TiO2 (IO-TiO2 ) electrodes. While PMSA1 introduces sensitivity for visible light into the biohybrid architecture and ensures the efficient wiring between the IO-TiO2 electrode and the biocatalytic entity, PQQ-GDH provides the catalytic activity for the glucose oxidation and therefore feeds the light-driven reaction with electrons for an enhanced light-to-current conversion...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29185751/ca-2-switchable-glucose-dehydrogenase-associated-with-electrochemical-electronic-interfaces-applications-to-signal-controlled-power-production-and-biomolecular-release
#15
Ashkan Koushanpour, Maria Gamella, Zhong Guo, Elham Honarvarfard, Arshak Poghossian, Michael J Schöning, Kirill Alexandrov, Evgeny Katz
An artificial Ca2+ -regulated PQQ glucose dehydrogenase (PQQ-GDH) enzyme was electrically connected to conducting electrodes and semiconductor interfaces. Direct electron transfer from the enzyme to the conducting electrode support was stimulated by the addition of Ca2+ cations resulting in reversible enzyme activation. A signal-switchable biofuel cell and biomolecular release have been realized using the Ca2+ -activated enzyme immobilized on conducting electrodes. Interfacing the signal-switchable enzyme with a semiconductor chip allowed electronic read out of the enzyme ON-OFF states...
December 28, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29185343/pyrroloquinoline-quinone-a-redox-active-o-quinone-stimulates-mitochondrial-biogenesis-by-activating-the-sirt1-pgc-1%C3%AE-signaling-pathway
#16
Kazuhiro Saihara, Ryosuke Kamikubo, Kazuto Ikemoto, Koji Uchida, Mitsugu Akagawa
Pyrroloquinoline quinone (PQQ), a redox-active o-quinone found in various foods and mammalian tissues, has received an increasing amount of attention because of a number of health benefits that can be attributed to its ability to enhance mitochondrial biogenesis. However, its underlying molecular mechanism remains incompletely understood. We have now established that the exposure of mouse NIH/3T3 fibroblasts to a physiologically relevant concentration of PQQ significantly stimulates mitochondrial biogenesis...
December 19, 2017: Biochemistry
https://www.readbyqxmd.com/read/29148251/the-enzymatic-detoxification-of-the-mycotoxin-deoxynivalenol-identification-of-depa-from-the-don-epimerization-pathway
#17
Jason Carere, Yousef I Hassan, Dion Lepp, Ting Zhou
The biological detoxification of mycotoxins, including deoxynivalenol (DON), represents a very promising approach to address the challenging problem of cereal grain contamination. The recent discovery of Devosia mutans 17-2-E-8 (Devosia spp. 17-2-E-8), a bacterial isolate capable of transforming DON to the non-toxic stereoisomer 3-epi-deoxynivalenol, along with earlier reports of bacterial species capable of oxidizing DON to 3-keto-DON, has generated interest in the possible mechanism and enzyme(s) involved...
November 17, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/29118900/effect-and-mechanism-of-pyrroloquinoline-quinone-on-anti-osteoporosis-in-bmi-1-knockout-mice-anti-oxidant-effect-of-pyrroloquinoline-quinone
#18
Yuanqing Huang, Ning Chen, Dengshun Miao
Pyrroloquinoline quinone (PQQ), considered as an ROS scavenger,could protect mitochondrial activity from damage of oxidative stress. To determine the role of PQQ supplement in rescuing long bone osteoporosis in Bmi-1-/- mice. We fed Bmi-1 knockout mice a diet supplemented with PQQ (BKO+PQQ), BKO mice with normal diet (BKO) and wild type mice with normal diet (WT) as controls. We compared the differences of skeletal phenotype by means of imaging, histopathological and molecular biology methods in three groups of animals...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/29059797/a-self-powered-glucose-biosensor-based-on-pyrolloquinoline-quinone-glucose-dehydrogenase-and-bilirubin-oxidase-operating-under-physiological-conditions
#19
Tanmay Kulkarni, Gymama Slaughter
A novel biosensing system capable of simultaneously sensing glucose and powering portable electronic devices such as a digital glucometer is described. The biosensing system consists of enzymatic glucose biofuel cell bioelectrodes functionalized with pyrolloquinoline quinone glucose dehydrogenase (PQQ-GDH) and bilirubin oxidase (BOD) at the bioanode and biocathode, respectively. A dual-stage power amplification circuit is integrated with the single biofuel cell to amplify the electrical power generated. In addition, a capacitor circuit was incorporated to serve as the transducer for sensing glucose...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29049946/rechargeable-flexible-and-mediator-free-biosupercapacitor-based-on-transparent-ito-nanoparticle-modified-electrodes-acting-in-%C3%A2%C2%B5m-glucose-containing-buffers
#20
Tim Bobrowski, Elena González Arribas, Roland Ludwig, Miguel D Toscano, Sergey Shleev, Wolfgang Schuhmann
We present a transparent and flexible self-charging biosupercapacitor based on an optimised mediator- and membrane-free enzymatic glucose/oxygen biofuel cell. Indium tin oxide (ITO) nanoparticles were spray-coated on transparent conducting ITO supports resulting in a flocculent, porous and nanostructured electrode surface. By this, high capacitive currents caused by an increased electrochemical double layer as well as enhanced catalytic currents due to a higher number of immobilised enzyme molecules were obtained...
October 11, 2017: Biosensors & Bioelectronics
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