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https://www.readbyqxmd.com/read/28329766/complex-pectin-metabolism-by-gut-bacteria-reveals-novel-catalytic-functions
#1
Didier Ndeh, Artur Rogowski, Alan Cartmell, Ana S Luis, Arnaud Baslé, Joseph Gray, Immacolata Venditto, Jonathon Briggs, Xiaoyang Zhang, Aurore Labourel, Nicolas Terrapon, Fanny Buffetto, Sergey Nepogodiev, Yao Xiao, Robert A Field, Yanping Zhu, Malcolm A O'Neill, Breeanna R Urbanowicz, William S York, Gideon J Davies, D Wade Abbott, Marie-Christine Ralet, Eric C Martens, Bernard Henrissat, Harry J Gilbert
The metabolism of carbohydrate polymers drives microbial diversity in the human gut microbiota. It is unclear, however, whether bacterial consortia or single organisms are required to depolymerize highly complex glycans. Here we show that the gut bacterium Bacteroides thetaiotaomicron uses the most structurally complex glycan known: the plant pectic polysaccharide rhamnogalacturonan-II, cleaving all but 1 of its 21 distinct glycosidic linkages. The deconstruction of rhamnogalacturonan-II side chains and backbone are coordinated to overcome steric constraints, and the degradation involves previously undiscovered enzyme families and catalytic activities...
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28329397/resveratrol-improves-vascular-function-and-mitochondrial-number-but-not-glucose-metabolism-in-older-adults
#2
Rena M Pollack, Nir Barzilai, Valentin Anghel, Ameya S Kulkarni, Aaron Golden, Pilib O'Broin, David A Sinclair, Michael S Bonkowski, Alexander J Coleville, Danielle Powell, Sharon Kim, Ruin Moaddel, Daniel Stein, Kehao Zhang, Meredith Hawkins, Jill P Crandall
Background: Resveratrol, a plant-derived polyphenol, has been reported to improve glucose metabolism and vascular function and to extend life span in animal models, but studies in humans have been inconclusive. Methods: In a randomized, double-blind crossover study, we treated older glucose-intolerant adults (n = 30) with resveratrol (2-3 g/daily) or placebo, each for 6 weeks. A standard mixed-meal test was used to assess insulin sensitivity (Matsuda index) and secretion (C-peptide deconvolution) and vascular function by reactive hyperemia peripheral arterial tonometry...
March 16, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28325834/structural-model-of-dodecameric-heat-shock-protein-hsp21-flexible-n-terminal-arms-interact-with-client-proteins-while-c-terminal-tails-maintain-the-dodecamer-and-chaperone-activity
#3
Gudrun Rutsdottir, Johan Härmark, Yoran Weide, Hans Hebert, Morten Ib Rasmussen, Sven Wernersson, Michal Respondek, Mikael Akke, Peter Højrup, Philip J B Koeck, Christopher A G Söderberg, Cecilia Emanuelsson
Small heat shock proteins (sHsps) prevent aggregation of thermosensitive client proteins in a first line of defense against cellular stress. The mechanisms by which they perform this function have been hard to define due to limited structural information; currently there is only one high-resolution structure of a plant sHsp published, of the cytosolic Hsp16.9. We took interest in Hsp21, a chloroplast-localized sHsp crucial for plant stress resistance, which has even longer N-terminals arms than Hsp16.9, with a functionally important and conserved methionine-rich motif...
March 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28324258/optimizing-irrigation-and-nitrogen-for-wheat-through-empirical-modeling-under-semi-arid-environment
#4
Umer Saeed, Syed Aftab Wajid, Tasneem Khaliq, Zahir Ahmad Zahir
Nitrogen fertilizer availability to plants is strongly linked with water availability. Excessive or insufficient use of nitrogen can cause reduction in grain yield of wheat and environmental issues. The per capita per annum water availability in Pakistan has reduced to less than 1000 m(3) and is expected to reach 800 m(3) during 2025. Irrigating crops with 3 or more than 3 in. of depth without measuring volume of water is not a feasible option anymore. Water productivity and economic return of grain yield can be improved by efficient management of water and nitrogen fertilizer...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28321972/vectorization-of-agrochemicals-via-amino-acid-carriers-influence-of-the-spacer-arm-structure-on-the-phloem-mobility-of-phenylpyrrole-conjugates-in-the-ricinus-system
#5
Sophie Marhadour, Hanxiang Wu, Wen Yang, Cécile Marivingt-Mounir, Jean-Louis Bonnemain, Jean-François Chollet
BACKGROUND: Excessive agrochemical use causes significant threats to environmental safety and human health. Reducing pesticide use without reducing yield is necessary for sustainable agriculture. Therefore we developed a vectorization strategy to enhance agrochemical delivery through plant amino acid carriers. RESULTS: In addition to a fenpiclonil conjugate recently described, three new amino acid conjugates were synthesized by coupling fenpiclonil to an L-α-amino acid...
March 20, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28321650/the-small-auxin-up-rna-ossaur45-affects-auxin-synthesis-and-transport-in-rice
#6
Yan-Xia Xu, Meng-Zhu Xiao, Yan Liu, Jun-Liang Fu, Yi He, De-An Jiang
This research is the first to demonstrate that OsSAUR45 is involved in plant growth though affecting auxin synthesis and transport by repressing OsYUCCA and OsPIN gene expression in rice. Small auxin-up RNAs (SAURs) comprise a large multigene family and are rapidly activated as part of the primary auxin response in plants. However, little is known about the role of SAURs in plant growth and development, especially in monocots. Here, we report the biological function of OsSAUR45 in the model plant rice (Oryza sativa)...
March 20, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28321576/two-distinct-cinnamoyl-coa-reductases-in-selaginella-moellendorffii-offer-insight-into-the-divergence-of-ccrs-in-plants
#7
Nan Chao, Shuang Li, Ning Li, Qi Qi, Wen-Ting Jiang, Xiang-Ning Jiang, Ying Gai
Two distinct cinnamoyl-coenzyme A reductases (CCRs) from Selaginella moellendorffii were evaluated, and of these, SmCCR2-1, which has both distinct sequence motifs and catalytic properties, was clustered into a new CCR subgroup. Cinnamoyl-coenzyme A reductases (CCRs) have been reported in many land plants to have critical functions in monolignol biosynthesis. In this study, we performed a genome-wide screen and obtained two distinct SmCCRs from S. moellendorffii. Phylogenetic analysis indicated that SmCCR2 (both SmCCR2-1 and 2-2) and SmCCR3 together with PpaCCR belong to a distinct subgroup of genuine CCRs with variations in the NAD(P)H-binding motif...
March 20, 2017: Planta
https://www.readbyqxmd.com/read/28320429/chrysin-inhibited-tumor-glycolysis-and-induced-apoptosis-in-hepatocellular-carcinoma-by-targeting-hexokinase-2
#8
Dong Xu, Junzhe Jin, Hao Yu, Zheming Zhao, Dongyan Ma, Chundong Zhang, Honglei Jiang
BACKGROUND: Hexokinase-2(HK-2) plays dual roles in glucose metabolism and mediation of cell apoptosis, making it an attractive target for cancer therapy. Chrysin is a natural flavone found in plant extracts which are widely used as herb medicine in China. In the present study, we investigated the antitumor activity of chrysin against hepatocellular carcinoma (HCC) and the role of HK-2 played for chrysin to exert its function. METHODS: The expression of HK-2 in HCC cell line and tumor tissue was examined by western blotting and immunohistochemistry staining...
March 20, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28319670/identification-of-candidate-genes-for-the-seed-coat-colour-change-in-a-brachypodium-distachyon-mutant-induced-by-gamma-radiation-using-whole-genome-re-sequencing
#9
Man Bo Lee, Dae Yeon Kim, Yong Weon Seo
Brachypodium distachyon has been proposed as a model plant for agriculturally important cereal crops such as wheat and barley. Seed coat colour change from brown-red to yellow was observed in a mutant line (142-3) of B. distachyon, which was induced by chronic gamma radiation. In addition, dwarf phenotypes were observed in each of the lines 142-3, 421-2, and 1376-1. In order to identify causal mutations for the seed coat colour change, the three mutant lines and the wild type were subjected to whole-genome re-sequencing...
March 20, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28319155/relationships-between-abiotic-environment-plant-functional-traits-and-animal-body-size-at-mount-kilimanjaro-tanzania
#10
David Schellenberger Costa, Alice Classen, Stefan Ferger, Maria Helbig-Bonitz, Marcell Peters, Katrin Böhning-Gaese, Ingolf Steffan-Dewenter, Michael Kleyer
The effect-response framework states that plant functional traits link the abiotic environment to ecosystem functioning. One ecosystem property is the body size of the animals living in the system, which is assumed to depend on temperature or resource availability, among others. For primary consumers, resource availability may directly be related to plant traits, while for secondary consumers the relationship is indirect. We used plant traits to describe resource availability along an elevational gradient on Mount Kilimanjaro, Tanzania...
2017: PloS One
https://www.readbyqxmd.com/read/28316604/expression-of-the-knotted-homeobox-genes-in-the-cactaceae-cambial-zone-suggests-their-involvement-in-wood-development
#11
Jorge Reyes-Rivera, Gustavo Rodríguez-Alonso, Emilio Petrone, Alejandra Vasco, Francisco Vergara-Silva, Svetlana Shishkova, Teresa Terrazas
The vascular cambium is a lateral meristem that produces secondary xylem (i.e., wood) and phloem. Different Cactaceae species develop different types of secondary xylem; however, little is known about the mechanisms underlying wood formation in the Cactaceae. The KNOTTED HOMEOBOX (KNOX) gene family encodes transcription factors that regulate plant development. The role of class I KNOX genes in the regulation of the shoot apical meristem, inflorescence architecture, and secondary growth is established in a few model species, while the functions of class II KNOX genes are less well understood, although the Arabidopsis thaliana class II KNOX protein KNAT7 is known to regulate secondary cell wall biosynthesis...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28316391/antileishmanial-and-immunomodulatory-potential-of-ocimumsanctum-linn-and-cocosnucifera-linn-in-murine-visceral-leishmaniasis
#12
Gaurav Bhalla, Sukhbir Kaur, Jaspreet Kaur, Rupinder Kaur, Puneet Raina
The role of immunomodulation in the therapeutic treatment of visceral leishmaniasis has gained eminence in view of moderate to severe drawbacks of the currently available drugs like toxicity, drug resistance and prohibitive costs. The potential for modulation of the immune system of many herbal plants can be tapped to address these problems. We conducted the present research study to investigate the antileishmanial and immunomodulatory effects of Ocimum sanctum Linn. and Cocos nucifera Linn. during the progression of visceral leishmaniasis in BALB/c mouse model...
March 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28314113/genome-wide-estimation-of-heritability-and-its-functional-components-for-flowering-defense-ionomics-and-developmental-traits-in-a-geographically-diverse-population-of-i-arabidopsis-thaliana-i
#13
Rong-Cai Yang
Narrow-sense heritability (portion of the total phenotypic variation due to additive genetic effect, <i>h</i><sup>2</sup>) is a critical parameter in plant breeding and genetics, but its estimation is difficult for populations with unknown pedigree information. This study applied a marker-based linear mixed model (LMM) analysis to estimate narrow-sense heritability and its seven functional components corresponding to SNPs in coding and noncoding regions for each of 107 flowering, defense, ionomics and developmental traits in an Arabidopsis (<i>Arabidopsis thaliana</i>) population of 199 inbred lines with unknown genetic relatedness...
March 17, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28303148/differentiating-wheat-genotypes-by-bayesian-hierarchical-nonlinear-mixed-modeling-of-wheat-root-density
#14
Anton P Wasson, Grace S Chiu, Alexander B Zwart, Timothy R Binns
Ensuring future food security for a growing population while climate change and urban sprawl put pressure on agricultural land will require sustainable intensification of current farming practices. For the crop breeder this means producing higher crop yields with less resources due to greater environmental stresses. While easy gains in crop yield have been made mostly "above ground," little progress has been made "below ground"; and yet it is these root system traits that can improve productivity and resistance to drought stress...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28303145/evolutionary-analyses-of-gras-transcription-factors-in-angiosperms
#15
Alberto Cenci, Mathieu Rouard
GRAS transcription factors (TFs) play critical roles in plant growth and development such as gibberellin and mycorrhizal signaling. Proteins belonging to this gene family contain a typical GRAS domain in the C-terminal sequence, whereas the N-terminal region is highly variable. Although, GRAS genes have been characterized in a number of plant species, their classification is still not completely resolved. Based on a panel of eight representative species of angiosperms, we identified 29 orthologous groups or orthogroups (OGs) for the GRAS gene family, suggesting that at least 29 ancestor genes were present in the angiosperm lineage before the "Amborella" evolutionary split...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28301721/highly-selective-vertically-aligned-nanopores-in-sustainably-derived-polymer-membranes-by-molecular-templating
#16
Xunda Feng, Kohsuke Kawabata, Gilad Kaufman, Menachem Elimelech, Chinedum O Osuji
We describe a combination of molecular templating and directed self-assembly to realize highly selective vertically aligned nanopores in polymer membranes using sustainably derived materials. The approach exploits a structure directing molecule to template the assembly of plant-derived fatty acids into highly ordered columnar mesophases. Directed self-assembly using physical confinement and magnetic fields provides vertical alignment of the columnar nanostructures in large area (several cm(2)) thin films. Chemically crosslinking the mesophase with added conventional vinyl comonomers and removing the molecular template results in a mechanically robust polymer film with vertically aligned 1...
March 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28301688/multiplex-single-cell-quantification-of-rare-rna-transcripts-from-protoplasts-in-a-model-plant-system
#17
Ulhas S Kadam, Burkhard Schulz, Joseph M K Irudayaraj
Here we demonstrate multiplex and simultaneous detection of four different rare RNA species from plant, Arabidopsis thaliana, using surface enhanced Raman spectroscopy and gold nanoprobes at single cell resolution. We show the applicability of nanoparticle-based Raman spectroscopic sensor to study intracellular RNA copies. First, we demonstrate that gold-nanoparticles decorate with Raman probes and carrying specific nucleic acid probe sequences can be uptaken by the protoplasts. We confirm the internalization of gold nanoprobes by TEM, ICP-MS, and fluorescence imaging...
March 16, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28301564/temperature-dependent-phenology-of-plutella-xylostella-lepidoptera-plutellidae-simulation-and-visualization-of-current-and-future-distributions-along-the-eastern-afromontane
#18
Benignus V Ngowi, Henri E Z Tonnang, Evans M Mwangi, Tino Johansson, Janet Ambale, Paul N Ndegwa, Sevgan Subramanian
There is a scarcity of laboratory and field-based results showing the movement of the diamondback moth (DBM) Plutella xylostella (L.) across a spatial scale. We studied the population growth of the diamondback moth (DBM) Plutella xylostella (L.) under six constant temperatures, to understand and predict population changes along altitudinal gradients and under climate change scenarios. Non-linear functions were fitted to continuously model DBM development, mortality, longevity and oviposition. We compiled the best-fitted functions for each life stage to yield a phenology model, which we stochastically simulated to estimate the life table parameters...
2017: PloS One
https://www.readbyqxmd.com/read/28300158/the-receptor-like-pseudokinase-mrh1-interacts-with-the-voltage-gated-potassium-channel-akt2
#19
Kamil Sklodowski, Janin Riedelsberger, Natalia Raddatz, Gonzalo Riadi, Julio Caballero, Isabelle Chérel, Waltraud Schulze, Alexander Graf, Ingo Dreyer
The potassium channel AKT2 plays important roles in phloem loading and unloading. It can operate as inward-rectifying channel that allows H(+)-ATPase-energized K(+) uptake. Moreover, through reversible post-translational modifications it can also function as an open, K(+)-selective channel, which taps a 'potassium battery', providing additional energy for transmembrane transport processes. Knowledge about proteins involved in the regulation of the operational mode of AKT2 is very limited. Here, we employed a large-scale yeast two-hybrid screen in combination with fluorescence tagging and null-allele mutant phenotype analysis and identified the plasma membrane localized receptor-like kinase MRH1/MDIS2 (AT4G18640) as interaction partner of AKT2...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28296168/plant-xylem-hydraulics-what-we-understand-current-research-and-future-challenges
#20
Martin D Venturas, John S Sperry, Uwe G Hacke
Herein we review the current state-of-the-art of plant hydraulics in the context of plant physiology, ecology, and evolution, focusing on current and future research opportunities. We explain the physics of water transport in plants and the limits of this transport system, highlighting the relationships between xylem structure and function. We describe the great variety of techniques existing for evaluating xylem resistance to cavitation. We address several methodological issues and their connection with current debates on conduit refilling and exponential shape vulnerability curves...
March 14, 2017: Journal of Integrative Plant Biology
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