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https://www.readbyqxmd.com/read/29768135/seeing-the-light-the-roles-of-red-and-blue-light-sensing-in-plant-microbes
#1
Gwyn A Beattie, Bridget M Hatfield, Haili Dong, Regina S McGrane
Plants collect, concentrate, and conduct light throughout their tissues, thus enhancing light availability to their resident microbes. This review explores the role of photosensing in the biology of plant-associated bacteria and fungi, including the molecular mechanisms of red-light sensing by phytochromes and blue-light sensing by LOV (light-oxygen-voltage)-domain proteins in these microbes. Bacteriophytochromes function as major drivers of the bacterial transcriptome and mediate light-regulated suppression of virulence, motility, and conjugation in some phytopathogens and light-regulated induction of the photosynthetic apparatus in a stem-nodulating symbiont...
May 16, 2018: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/29704951/lower-c-reactive-protein-and-il-6-associated-with-vegetarian-diets-are-mediated-by-bmi
#2
K Jaceldo-Siegl, E Haddad, S Knutsen, J Fan, J Lloren, D Bellinger, G E Fraser
BACKGROUND AND AIMS: The mechanism by which vegetarian diets are associated with less inflammation is not clear. We investigated the role of BMI as a mediator in the relationship between vegetarian diet and concentrations of C-reactive protein (CRP), and the cytokines IL-6, IL-10 and TNF-α. METHODS AND RESULTS: We used data from participants of the Adventist Health Study 2 (AHS-2) Calibration (n = 893) and Biological Manifestations of Religion (n = 478) sub-studies...
March 13, 2018: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
https://www.readbyqxmd.com/read/29700485/near-infrared-light-controlled-systems-for-gene-transcription-regulation-protein-targeting-and-spectral-multiplexing
#3
Taras A Redchuk, Andrii A Kaberniuk, Vladislav V Verkhusha
Near-infrared (NIR, 740-780 nm) optogenetic systems are well-suited to spectral multiplexing with blue-light-controlled tools. Here, we present two protocols, one for regulation of gene transcription and another for control of protein localization, that use a NIR-responsive bacterial phytochrome BphP1-QPAS1 optogenetic pair. In the first protocol, cells are transfected with the optogenetic constructs for independently controlling gene transcription by NIR (BphP1-QPAS1) and blue (LightOn) light. The NIR and blue-light-controlled gene transcription systems show minimal spectral crosstalk and induce a 35- to 40-fold increase in reporter gene expression...
May 2018: Nature Protocols
https://www.readbyqxmd.com/read/29691631/lovastatin-synergizes-with-itraconazole-against-planktonic-cells-and-biofilms-of-candida-albicans-through-the-regulation-on-ergosterol-biosynthesis-pathway
#4
Yujie Zhou, Hong Yang, Xuedong Zhou, Hongke Luo, Fan Tang, Jin Yang, Gil Alterovitz, Lei Cheng, Biao Ren
The increase of fungal infectious diseases and lack of safe and efficacious antifungal drugs result in the urgent need of new therapeutic strategies. Here, we repurposed the lovastatin (LOV) as a synergistic antifungal potentiator to itraconazole (ITZ) against Candida albicans planktonic cells and biofilms in vitro for the first time. Mutants from ergosterol biosynthesis pathway were employed and key gene expression profiles of ergosterol pathway were also measured. LOV single treatment was unable to inhibit C...
April 25, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29686359/direct-multiplex-imaging-and-optogenetics-of-rho-gtpases-enabled-by-near-infrared-fret
#5
Daria M Shcherbakova, Natasha Cox Cammer, Tsipora M Huisman, Vladislav V Verkhusha, Louis Hodgson
Direct visualization and light control of several cellular processes is a challenge, owing to the spectral overlap of available genetically encoded probes. Here we report the most red-shifted monomeric near-infrared (NIR) fluorescent protein, miRFP720, and the fully NIR Förster resonance energy transfer (FRET) pair miRFP670-miRFP720, which together enabled design of biosensors compatible with CFP-YFP imaging and blue-green optogenetic tools. We developed a NIR biosensor for Rac1 GTPase and demonstrated its use in multiplexed imaging and light control of Rho GTPase signaling pathways...
April 23, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29682744/characterization-of-a-vivid-homolog-in-botrytis-cinerea
#6
Brandon J Foley, Haley Stutts, Sydney L Schmitt, Jameela Lokhandwala, Aditi Nagar, Brian D Zoltowski
Blue-light signaling pathways regulated by members of the Light-Oxygen-Voltage (LOV) domain family integrate stress responses, circadian rhythms and pathogenesis in fungi. The canonical signaling mechanism involves two LOV containing proteins that maintain homology to Neurospora crassa Vivid (NcVVD) and White Collar 1 (NcWC1). These proteins engage in homo- and heterodimerization events that modulate gene transcription in response to light. Here, we clone and characterize the VVD homolog in Botrytis cinerea (BcVVD)...
April 23, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29674079/a-comparison-study-on-the-use-of-dowex-1-and-teva-resin-in-determination-of-99-tc-in-environmental-and-nuclear-coolant-samples-in-a-sia-system-with-icp-ms-detection
#7
Kamila Kołacińska, Zbigniew Samczyński, Jakub Dudek, Anna Bojanowska-Czajka, Marek Trojanowicz
This work refers to a comparative study of sorbents widely used in determinations of 99 Tc such as TEVA resin and Dowex 1. Despite having a similar functional group of quaternary amines, both materials represent different chromatographic methods-extraction (TEVA resin) and anion exchange (Dowex 1)-which provides a diverse range of their properties significant in determination of 99 Tc in flow conditions. The comparative tests, carried out in a SIA-LOV (Sequential Injection Analysis-Lab-on-Valve) system combined with mass spectrometric (ICP-MS) detection, considered several factors that are crucial from the standpoint of resin´s utility such as sorption capacity, durability, or selectivity, critical in 99 Tc separation from interferences...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29611000/design-characterization-and-in-vivo-functioning-of-a-light-dependent-histidine-protein-kinase-in-the-yeast-saccharomyces-cerevisiae
#8
Aleksandra Bury, Klaas J Hellingwerf
Helical alignment of the α-helical linker of the LOV (light-oxygen-voltage) domain of YtvA from Bacillus subtilis with the α-helical linker of the histidine-protein kinase domain of the Sln1 kinase of the phospho-relay system for osmoregulation of Saccharomyces cerevisiae has been used to construct a light-modulatable histidine protein kinase. In vitro, illumination with blue light inhibits both the ATP-dependent phosphorylation of this hybrid kinase, as well as the phosphoryl transfer to Ypd1, the phosphoryl transfer domain of the Sln1 system...
April 2, 2018: AMB Express
https://www.readbyqxmd.com/read/29510201/rat-inferior-caval-vein-icv-ligature-and-particular-new-insights-with-the-stable-gastric-pentadecapeptide-bpc-157
#9
Jakša Vukojević, Marko Siroglavić, Katarina Kašnik, Tamara Kralj, Duje Stanćić, Antonio Kokot, Darko Kolarić, Domagoj Drmić, Anita Zenko Sever, Ivan Barišić, Jelena Šuran, Davor Bojić, Masa Hrelec Patrlj, Ivica Sjekavica, Katarina Horvat Pavlov, Tinka Vidović, Josipa Vlainić, Mirjana Stupnišek, Sven Seiwerth, Predrag Sikirić
Rat inferior caval vein (ICV) ligation (up to the right ovarian vein (ROV)) commonly represents a recapitulation of Virchow: with ligation leading to vessel injury, stasis, thrombosis and hemodynamic changes. We revealed that BPC 157's therapy collectively attenuated or counteracted all these events and the full syndrome. METHODS: We applied BPC 157 (10 μg, 10 ng/kg) as an early regimen or as a delayed therapy. Assessment includes gross assessment by microcamera; microscopy, venography, bleeding, blood pressure, ECG, thermography, MDA and NO-level in plasma and ICV, and gene expression...
March 3, 2018: Vascular Pharmacology
https://www.readbyqxmd.com/read/29490460/lab-on-a-valve-mesofluidic-platform-for-on-chip-handling-of-carbon-coated-titanium-dioxide-nanotubes-in-a-disposable-microsolid-phase-extraction-mode
#10
María Teresa García-Valverde, María Rosende, Rafael Lucena, Soledad Cárdenas, Manuel Miró
Mesofluidic lab-on-a-valve (LOV) platforms have been proven suitable to accommodate automatic micro-solid-phase extraction (μSPE) approaches with on-chip handling of micrometer-bead materials in a fully disposable mode to prevent sample cross-contamination and pressure-drop effects. The efficiency of the extraction process notably depends upon the sorptive capacity of the material because the sorbent mass is usually down to 10 mg in LOV devices. Nanomaterials, capitalizing upon their enhanced surface-to-volume ratio and diversity of potential chemical moieties, are appealing alternatives to microbead sorbents...
April 3, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29450110/quantitative-analyses-of-the-equilibria-among-dna-complexes-of-a-blue-light-regulated-bzip-module-photozipper
#11
Yoichi Nakatani, Osamu Hisatomi
Aureochrome1 is a blue-light-receptor protein identified in a stramenopile alga, Vaucheria frigida . Photozipper (PZ) is an N-terminally truncated, monomeric, V. frigida aureochrome1 fragment containing a basic leucine zipper (bZIP) domain and a light-oxygen-voltage (LOV)-sensing domain. PZ dimerizes upon photoexcitation and consequently increases its affinity for the target sequence. In the present study, to understand the equilibria among DNA complexes of PZ, DNA binding by PZ and mutational variants was quantitatively investigated by electrophoretic-mobility-shift assay and fluorescence-correlation spectroscopy in the dark and light states...
2018: Biophysics and Physicobiology
https://www.readbyqxmd.com/read/29432690/sequential-dna-binding-and-dimerization-processes-of-the-photosensory-protein-el222
#12
Akira Takakado, Yusuke Nakasone, Masahide Terazima
EL222 is a blue light sensor protein, which consists of a light-oxygen-voltage domain as a light sensor and a LuxR-type helix-turn-helix DNA-binding domain. The reaction dynamics of the protein-DNA binding were observed for the first time using the time-resolved transient grating method. The reaction scheme was determined, showing that photoexcited EL222 first binds DNA and the ground state EL222 monomer is subsequently associated with the complex. Rate constants on the millisecond scale were determined for these processes...
March 13, 2018: Biochemistry
https://www.readbyqxmd.com/read/29426833/novel-reversibly-switchable-fluorescent-proteins-for-resolft-and-sted-nanoscopy-engineered-from-the-bacterial-photoreceptor-ytva
#13
Carola Gregor, Sven C Sidenstein, Martin Andresen, Steffen J Sahl, Johann G Danzl, Stefan W Hell
The reversibly switchable fluorescent proteins (RSFPs) commonly used for RESOLFT nanoscopy have been developed from fluorescent proteins of the GFP superfamily. These proteins are bright, but exhibit several drawbacks such as relatively large size, oxygen-dependence, sensitivity to low pH, and limited switching speed. Therefore, RSFPs from other origins with improved properties need to be explored. Here, we report the development of two RSFPs based on the LOV domain of the photoreceptor protein YtvA from Bacillus subtilis...
February 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29261300/dimeric-structure-of-the-blue-light-sensor-protein-photozipper-in-the-active-state
#14
Kohei Ozeki, Hiroyuki Tsukuno, Hiroki Nagashima, Osamu Hisatomi, Hiroyuki Mino
The light oxygen voltage-sensing (LOV) domain plays a crucial role in blue light (BL) sensing in plants and microorganisms. LOV domains are usually associated with the effector domains and regulate the activities of effector domains in a BL-dependent manner. Photozipper (PZ) is monomeric in the dark state. BL induces reversible dimerization of PZ and subsequently increases its affinity for the target DNA sequence. In this study, we report the analyses of PZ by pulsed electron-electron double resonance (PELDOR)...
February 6, 2018: Biochemistry
https://www.readbyqxmd.com/read/29248583/gmplp1-a-pas-lov-protein-functions-as-a-possible-new-type-of-blue-light-photoreceptor-in-soybean
#15
Yongguang Li, Yanzheng Zhang, Mengting Li, Qiulan Luo, Ali Inayat Mallano, Ya Jing, Yuhang Zhang, Lin Zhao, Wenbin Li
Light is one of the most important environmental factors for the growth and development of plants. To adapt to changes in day length, the photoreception and transmission of the light signals in plants mainly depend on the various light receptor proteins. The PAS/LOV protein (PLP) has a PAS domain in the N-terminal and LOV domain in the C-terminal and has been confirmed as a new type of blue light receptor in Arabidopsis thaliana. However, the role of its counterpart in soybean remains largely unclear. In this study, the expression pattern of the GmPLP1 under different light qualities was determined by real-time RT-PCR analysis using the cultivar 'DongNong 42', a photosensitive soybean cultivar, suggesting that GmPLP1 was affected by the circadian clock and was a dark-induced gene...
March 1, 2018: Gene
https://www.readbyqxmd.com/read/29248322/-can-a-simple-lung-ultrasound-score-predict-length-of-ventilation-for-infants-with-severe-acute-viral-bronchiolitis
#16
M Taveira, N Yousef, J Miatello, C Roy, C Claude, B Boutillier, C Dubois, A-F Pierre, P Tissières, P Durand
BACKGROUND: Lung ultrasound (LU) is a bedside point-of-care technique in critical care and emergency medicine. LU is quick and non-irradiating, and provides accurate diagnostic information when compared with chest radiographs. Specific LU signs have been described for bronchiolitis. This study aimed to evaluate the correlation between severity of LU-diagnosed lung lesions, using a quantitative LU score, and the length of non-invasive ventilation (LOV) for infants diagnosed with severe viral bronchiolitis...
February 2018: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/29239168/variation-in-lov-photoreceptor-activation-dynamics-probed-by-time-resolved-infrared-spectroscopy
#17
James N Iuliano, Agnieszka A Gil, Sergey P Laptenok, Christopher R Hall, Jinnette Tolentino Collado, Andras Lukacs, Safaa A Hag Ahmed, Jenna Abyad, Taraneh Daryaee, Gregory M Greetham, Igor V Sazanovich, Boris Illarionov, Adelbert Bacher, Markus Fischer, Michael Towrie, Jarrod B French, Stephen R Meech, Peter J Tonge
The light, oxygen, voltage (LOV) domain proteins are blue light photoreceptors that utilize a noncovalently bound flavin mononucleotide (FMN) cofactor as the chromophore. The modular nature of these proteins has led to their wide adoption in the emerging fields of optogenetics and optobiology, where the LOV domain has been fused to a variety of output domains leading to novel light-controlled applications. In this work, we extend our studies of the subpicosecond to several hundred microsecond transient infrared spectroscopy of the isolated LOV domain AsLOV2 to three full-length photoreceptors in which the LOV domain is fused to an output domain: the LOV-STAS protein, YtvA, the LOV-HTH transcription factor, EL222, and the LOV-histidine kinase, LovK...
February 6, 2018: Biochemistry
https://www.readbyqxmd.com/read/29225355/evolutionary-conservation-and-functional-divergence-of-the-lfk-gene-family-play-important-roles-in-the-photoperiodic-flowering-pathway-of-land-plants
#18
Ling Liu, Yuanqi Wu, Zhengqiao Liao, Jing Xiong, Fengkai Wu, Jie Xu, Hai Lan, Qiling Tang, Shufeng Zhou, Yaxi Liu, Yanli Lu
ZEITLUPE (ZTL), LOV KELCH PROTEIN 2 (LKP2), and FLAVIN-BINDING KELCH REPEAT F-BOX 1 (FKF1)-blue-light photoreceptors-play important roles in regulating the circadian clock and photoperiodic flowering pathway in plants. In this study, phylogenetic analysis revealed that the LOV (Light, Oxygen, or Voltage) and Kelch repeat-containing F-box (LFK) gene family can be classified into two clades, ZTL/LKP2 and FKF1, with clear differentiation between monocots and dicots within each clade. The LFK family genes underwent strong purifying selection; however, signatures of positive selection to adapt to local conditions still existed in 18 specific codons...
April 2018: Heredity
https://www.readbyqxmd.com/read/29113919/lighting-up-my-life-a-lov-based-fluorescent-reporter-for-campylobacter-jejuni
#19
Bassam A Elgamoudi, Julian M Ketley
In this study, a LOV-based fluorescent reporter (light, oxygen, or voltage-sensing domains of phototropin), termed iLOV, was adapted for Campylobacter jejuni and used to investigate promoter activity via monitoring fluorescence intensity and to study the localisation of two chemotaxis proteins. The pC46 complementation vector contains coding sequence from cj0046, a C. jejuni NCTC11168 pseudo-gene and is used to integrate cloned genes onto the C. jejuni chromosome. The pC46 vector was used to construct plasmids containing iLOV, driven by three different C...
February 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29042655/electron-transfer-pathways-in-a-light-oxygen-voltage-lov-protein-devoid-of-the-photoactive-cysteine
#20
Benita Kopka, Kathrin Magerl, Anton Savitsky, Mehdi D Davari, Katrin Röllen, Marco Bocola, Bernhard Dick, Ulrich Schwaneberg, Karl-Erich Jaeger, Ulrich Krauss
Blue-light absorption by the flavin chromophore in light, oxygen, voltage (LOV) photoreceptors triggers photochemical reactions that lead to the formation of a flavin-cysteine adduct. While it has long been assumed that adduct formation is essential for signaling, it was recently shown that LOV photoreceptor variants devoid of the photoactive cysteine can elicit a functional response and that flavin photoreduction to the neutral semiquinone radical is sufficient for signal transduction. Currently, the mechanistic basis of the underlying electron- (eT) and proton-transfer (pT) reactions is not well understood...
October 17, 2017: Scientific Reports
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