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https://www.readbyqxmd.com/read/28231321/argonaute10-promotes-the-degradation-of-mir165-6-through-the-sdn1-and-sdn2-exonucleases-in-arabidopsis
#1
Yu Yu, Lijuan Ji, Brandon H Le, Jixian Zhai, Jiayi Chen, Elizabeth Luscher, Lei Gao, Chunyan Liu, Xiaofeng Cao, Beixin Mo, Jinbiao Ma, Blake C Meyers, Xuemei Chen
The degradation of small RNAs in plants and animals is associated with small RNA 3' truncation and 3' uridylation and thus relies on exonucleases and nucleotidyl transferases. ARGONAUTE (AGO) proteins associate with small RNAs in vivo and are essential for not only the activities but also the stability of small RNAs. AGO1 is the microRNA (miRNA) effector in Arabidopsis, and its closest homolog, AGO10, maintains stem cell homeostasis in meristems by sequestration of miR165/6, a conserved miRNA acting through AGO1...
February 2017: PLoS Biology
https://www.readbyqxmd.com/read/28230527/phloem-unloading-in-arabidopsis-roots-is-convective-and-regulated-by-the-phloem-pole-pericycle
#2
Timothy J Ross-Elliott, Kaare H Jensen, Katrine S Haaning, Brittney Michaelle Wager, Jan Knoblauch, Alexander H Howell, Daniel L Mullendore, Alexander G Monteith, Danae Paultre, Dawei Yan, Sofia Otero-Perez, Matthieu Bourdon, Ross Sager, Jung-Youn Lee, Ykä Helariutta, Michael Knoblauch, Karl John Oparka
In plants, a complex mixture of solutes and macromolecules is transported by the phloem. Here we examined how solutes and macromolecules are separated when they exit the phloem during the unloading process. We used a combination of approaches (non-invasive imaging, 3D-electron microscopy, and mathematical modelling) to show that phloem unloading of solutes in Arabidopsis roots occurs through plasmodesmata by a combination of mass flow and diffusion (convective phloem unloading). During unloading, solutes and proteins are diverted into the phloem-pole pericycle, a tissue connected to the protophloem by a unique class of 'funnel plasmodesmata'...
February 23, 2017: ELife
https://www.readbyqxmd.com/read/28230163/ectopic-expression-of-arabidopsis-target-of-rapamycin-attor-improves-water-use-efficiency-and-yield-potential-in-rice
#3
Achala Bakshi, Mazahar Moin, M Udaya Kumar, Aramati Bindu Madhava Reddy, Maozhi Ren, Raju Datla, E A Siddiq, P B Kirti
The target of Rapamycin (TOR) present in all eukaryotes is a multifunctional protein, regulating growth, development, protein translation, ribosome biogenesis, nutrient, and energy signaling. In the present study, ectopic expression of TOR gene of Arabidopsis thaliana in a widely cultivated indica rice resulted in enhanced plant growth under water-limiting conditions conferring agronomically important water-use efficiency (WUE) trait. The AtTOR high expression lines of rice exhibited profuse tillering, increased panicle length, increased plant height, high photosynthetic efficiency, chlorophyll content and low ∆(13)C...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28230101/a-novel-role-for-methyl-cysteinate-a-cysteine-derivative-in-cesium-accumulation-in-arabidopsis-thaliana
#4
Eri Adams, Takae Miyazaki, Aya Hayaishi-Satoh, Minwoo Han, Miyako Kusano, Himanshu Khandelia, Kazuki Saito, Ryoung Shin
Phytoaccumulation is a technique to extract metals from soil utilising ability of plants. Cesium is a valuable metal while radioactive isotopes of cesium can be hazardous. In order to establish a more efficient phytoaccumulation system, small molecules which promote plants to accumulate cesium were investigated. Through chemical library screening, 14 chemicals were isolated as 'cesium accumulators' in Arabidopsis thaliana. Of those, methyl cysteinate, a derivative of cysteine, was found to function within the plant to accumulate externally supplemented cesium...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229965/atmbd6-a-methyl-cpg-binding-domain-protein-maintains-gene-silencing-in-arabidopsis-by-interacting-with-rna-binding-proteins
#5
Adwaita Prasad Parida, Amrapali Sharma, Arun Kumar Sharma
DNA methylation, mediated by double-stranded RNA, is a conserved epigenetic phenomenon that protects a genome from transposons, silences unwanted genes and has a paramount function in plant or animal development. Methyl CpG binding domain proteins are members of a class of proteins that bind to methylated DNA. The Arabidopsis thaliana genome encodes 13 methyl CpG binding domain (MBD) proteins, but the molecular/biological functions of most of these proteins are still not clear. In the present study, we identified four proteins that interact with AtMBD6...
March 2017: Journal of Biosciences
https://www.readbyqxmd.com/read/28229589/production-of-cinnamyl-alcohol-glucoside-from-glucose-in-escherichia-coli
#6
Wei Zhou, Huiping Bi, Yibin Zhuang, Qinglin He, Hua Yin, Tao Liu, Yanhe Ma
Rosin, a cinnamyl alcohol glucoside, is one of the important ingredients in Rhodiola rosea, which is a valuable medicinal herb used for centuries. Rosin displayed multiple biological activities. The traditional method for producing rosin and derivatives is direct extraction from R. rosea, which suffers from limited availability of natural resources and complicated purification procedure. In this work, we achieved de novo biosynthesis of rosin in Escherichia coli. Firstly, a biosynthetic pathway of aglycon cinnamyl alcohol from phenylalanine was constructed...
February 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28229491/osnla1-a-ring-type-ubiquitin-ligase-maintains-phosphate-homeostasis-in-oryza-sativa-via-degradation-of-phosphate-transporters
#7
Wenhao Yue, Yinghui Ying, Chuang Wang, Yang Zhao, Changhe Dong, James Whelan, Huixia Shou
Inorganic phosphate (Pi) transporters (PTs) play vital roles in Pi uptake and translocation in plants. Under Pi sufficient conditions, PTs are degraded to prevent excess Pi accumulation. The mechanisms targeting PTs for degradation are not fully elucidated. In this study, we found that the Oryza sativa (rice) ortholog of Arabidopsis thaliana Nitrogen Limitation Adaptation (NLA), OsNLA1 protein, a RING-type E3 ubiquitin-ligase, was predominantly localized in the plasma membrane, and could interact with rice phosphate transporters OsPT2 and OsPT8...
February 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28229269/in-arabidopsis-thaliana-distinct-alleles-encoding-mitochondrial-rna-processing-factor-4-support-the-generation-of-additional-5-termini-of-ccmb-transcripts
#8
Katrin Stoll, Christian Jonietz, Sarah Schleicher, Catherine Colas des Francs-Small, Ian Small, Stefan Binder
In plant mitochondria, the 5' ends of many transcripts are generated post-transcriptionally. We show that the pentatricopeptide repeat (PPR) protein RNA PROCESSING FACTOR 4 (RPF4) supports the generation of extra 5' ends of ccmB transcripts in Landsberg erecta (Ler) and a number of other Arabidopsis thaliana ecotypes. RPF4 was identified in Ler applying a forward genetic approach supported by complementation studies of ecotype Columbia (Col), which generates the Ler-type extra ccmB 5' termini only after the introduction of the RPF4 allele from Ler...
February 22, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28228774/molecular-and-functional-characterization-of-wheat-argos-genes-influencing-plant-growth-and-stress-tolerance
#9
Yue Zhao, Xuejun Tian, Yuanyuan Li, Liyuan Zhang, Panfeng Guan, Xiaoxia Kou, Xiaobo Wang, Mingming Xin, Zhaorong Hu, Yingyin Yao, Zhongfu Ni, Qixin Sun, Huiru Peng
Auxin Regulated Gene involved in Organ Size (ARGOS) is significantly and positively associated with organ size and is involved in abiotic stress responses in plants. However, no studies on wheat ARGOS genes have been reported to date. In the present study, three TaARGOS homoeologous genes were isolated and located on chromosomes 4A, 4B, and 4D of bread wheat, all of which are highly conserved in wheat and its wild relatives. Comparisons of gene expression in different tissues demonstrated that the TaARGOSs were mainly expressed in the stem...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28228771/petal-loss-and-roxy1-interact-to-limit-growth-within-and-between-sepals-but-to-promote-petal-initiation-in-arabidopsis-thaliana
#10
Tezz Quon, Edwin R Lampugnani, David R Smyth
The activity of genes controlling organ development may be associated with the redox state of subregions within the meristem. Glutaredoxins react to the level of oxidative potential and can reduce cysteine dithiols, in some cases to activate specific transcription factors. In Arabidopsis, loss of function of the glutaredoxin ROXY1 or the trihelix transcription factor PETAL LOSS (PTL) each results in reduced numbers of petals. Here, genetic studies have revealed that loss of petals in ptl mutant plants depends on ROXY1 function...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28228767/identification-of-zoupi-orthologs-in-soybean-potentially-involved-in-endosperm-breakdown-and-embryogenic-development
#11
Yaohua Zhang, Xin Li, Suxin Yang, Xianzhong Feng
Soybean (Glycine max Merr.) is the world's most widely grown legume and provides an important source of protein and oil. Improvement of seed quality requires deep insights into the genetic regulation of seed development. The endosperm serves as a temporary source of nutrients that are transported from maternal to filial tissues, and it also generates signals for proper embryo formation. Endosperm cell death is associated with the processes of nutrient transfer and embryo expansion. The bHLH domain transcription factor AtZHOUPI (AtZOU) plays a key role in both the lysis of the transient endosperm and the formation of embryo cuticle in Arabidopsis thaliana...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28228763/cardiolipin-supports-respiratory-enzymes-in-plants-in-different-ways
#12
Jakob Petereit, Kenta Katayama, Christin Lorenz, Linda Ewert, Peter Schertl, Andreas Kitsche, Hajime Wada, Margrit Frentzen, Hans-Peter Braun, Holger Eubel
In eukaryotes the presence of the dimeric phospholipid cardiolipin (CL) is limited to the mitochondrial membranes. It resides predominantly in the inner membrane where it interacts with components of the mitochondrial electron transfer chain. CL deficiency has previously been shown to affect abundances of the plant NADH-dehydrogenase complex and its association with dimeric cyctochrome c reductase. Using an Arabidopsis thaliana knock-out mutant for the final enzyme of CL biosynthesis we here extend current knowledge on the dependence of plant respiration on CL...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28228439/loss-of-pollen-specific-phospholipase-not-like-dad-triggers-gynogenesis-in-maize
#13
Laurine M Gilles, Abdelsabour Khaled, Jean-Baptiste Laffaire, Sandrine Chaignon, Ghislaine Gendrot, Jérôme Laplaige, Hélène Bergès, Genséric Beydon, Vincent Bayle, Pierre Barret, Jordi Comadran, Jean-Pierre Martinant, Peter M Rogowsky, Thomas Widiez
Gynogenesis is an asexual mode of reproduction common to animals and plants, in which stimuli from the sperm cell trigger the development of the unfertilized egg cell into a haploid embryo. Fine mapping restricted a major maize QTL (quantitative trait locus) responsible for the aptitude of inducer lines to trigger gynogenesis to a zone containing a single gene NOT LIKE DAD (NLD) coding for a patatin-like phospholipase A. In all surveyed inducer lines, NLD carries a 4-bp insertion leading to a predicted truncated protein...
February 22, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28225829/inhibition-of-arabidopsis-chloroplast-%C3%AE-amylase-bam3-by-maltotriose-suggests-a-mechanism-for-the-control-of-transitory-leaf-starch-mobilisation
#14
Jing Li, Wenxu Zhou, Perigio Francisco, Russell Wong, Dongke Zhang, Steven M Smith
Starch breakdown in leaves at night is tightly matched to the duration of the dark period, but the mechanism by which this regulation is achieved is unknown. In Arabidopsis chloroplasts, β-amylase BAM3 hydrolyses transitory starch, producing maltose and residual maltotriose. The aim of the current research was to investigate the regulatory and kinetic properties of BAM3. The BAM3 protein was expressed in Escherichia coli and first assayed using a model substrate. Enzyme activity was stimulated by treatment with dithiothreitol and was increased 40% by 2-10 μM Ca2+ but did not require Mg2+...
2017: PloS One
https://www.readbyqxmd.com/read/28225203/identification-of-interacting-proteins-of-the-tafve-protein-involved-in-spike-development-in-bread-wheat
#15
Yong-Sheng Zheng, Yu-Qing Lu, Ying-Ying Meng, Rong-Zhi Zhang, Han Zhang, Jia-Mei Sun, Mu-Mu Wang, Li-Hui Li, Ru-Yu Li
FVE/MSI4 plays important roles in determining flowering time in Arabidopsis. However, its function is unexplored in wheat. In the present study, Co-IP and nano-LC-MS/MS were used to identify TaFVE-interacting or associated proteins. Altogether 89 differentially expressed proteins showed the same down-regulated expression trends as TaFVE in wheat line 5660M. Among them, 62 proteins were further predicted to be involved in the interaction network of TaFVE and 11 proteins have been shown to be potential TaFVE interactors based on curated databases and experimentally determined in other species by the STRING...
February 22, 2017: Proteomics
https://www.readbyqxmd.com/read/28225074/the-wasp-arp2-3-complex-signal-cascade-is-involved-in-actin-dependent-sperm-nuclei-migration-during-double-fertilization-in-tobacco-and-maize
#16
Xiongbo Peng, Tingting Yan, Mengxiang Sun
Sperm nuclear migration during fertilization in Arabidopsis and rice has recently been found to be actin-dependent, but the driving force behind this actin cytoskeleton-dependent motion is unclear. Here, we confirmed that the actin-dependent sperm nuclei migration during fertilization is a conserved mechanism in plants. Using in vitro fertilization systems, we showed that a functional actin is also essential in maize and tobacco for sperm nuclei migration after gamete membrane fusion. Cytoskeleton depolymerization inhibitor treatments supported the view that sperm nuclei migration is actin-dependent but microtubule-independent in both egg cell and central cell during double fertilization...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28225036/three-tfl1-homologues-regulate-floral-initiation-in-the-biofuel-plant-jatropha-curcas
#17
Chaoqiong Li, Qiantang Fu, Longjian Niu, Li Luo, Jianghua Chen, Zeng-Fu Xu
Recent research revealed that TERMINAL FLOWER 1 (TFL1) homologues are involved in the critical developmental process of floral initiation in several plant species. In this study, the functions of three putative TFL1 homologues (JcTFL1a, JcTFL1b and JcTFL1c) in the biofuel plant Jatropha curcas were analysed using the transgenic approach. JcTFL1b and JcTFL1c, but not JcTFL1a, could complement the TFL1 function and rescue early flowering and determinate inflorescence phenotype in tfl1-14 Arabidopsis mutant, thus suggesting that JcTFL1b and JcTFL1c may be homologues of TFL1...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224978/methylated-antibody-affinity-purification-to-improve-proteomic-identification-of-plant-rna-polymerase-pol-v-complex-and-the-interacting-proteins
#18
Guochen Qin, Jun Ma, Xiaomei Chen, Zhaoqing Chu, Yi-Min She
Affinity purification followed by enzymatic digestion and mass spectrometry has been widely utilized for the sensitive detection of interacting proteins and protein complexes in various organisms. In plants, the method is technically challenging due to the low abundance proteins, non-specific binding and difficulties of eluting interacting proteins from antibody beads. In this report, we describe a strategy to modify antibodies by reductive methylation of lysines without affecting their binding properties, followed by on-bead digestion of bound proteins with endoproteinase Lys-C...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224917/regulation-of-the-wheat-map-kinase-phosphatase-1-by-14-3-3-proteins
#19
Mouna Ghorbel, Valérie Cotelle, Chantal Ebel, Ikram Zaidi, Mélanie Ormancey, Jean-Philippe Galaud, Moez Hanin
Plant MAP kinase phosphatases (MKPs) are major regulators of MAPK signaling pathways and play crucial roles in controlling growth, development and stress responses. The presence of several functional domains in plant MKPs such as a dual specificity phosphatase catalytic domain, gelsolin, calmodulin-binding and serine-rich domains, suggests that MKPs can interact with distinct cellular partners, others than MAPKs. In this report, we identified a canonical mode I 14-3-3-binding motif (574KLPSLP579) located at the carboxy-terminal region of the wheat MKP, TMKP1...
April 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28224002/secretion-and-endocytosis-in-pollen-tubes-models-of-tip-growth-in-the-spot-light
#20
REVIEW
Gleb Grebnev, Maria Ntefidou, Benedikt Kost
Pollen tube tip growth is a widely used model ideally suited to study cellular processes underlying polarized cell expansion. Local secretion supplying material for plasma membrane (PM) and cell wall extension is essential for this process. Cell wall biogenesis requires fusion of secretory vesicles with the PM at an about 10× higher rate than PM extension. Excess material is therefore incorporated into the PM, which needs to be reinternalized through endocytosis. The classical model of tip growth proposes that exocytosis occurs at the apex and that newly incorporated PM material is transported to adjacent lateral regions, where excess material is endocytically recycled...
2017: Frontiers in Plant Science
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