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arabinogalactan proteins

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https://www.readbyqxmd.com/read/28184232/bioinformatics-prediction-and-evolution-analysis-of-arabinogalactan-proteins-in-the-plant-kingdom
#1
Yuling Ma, Chenchao Yan, Huimin Li, Wentao Wu, Yaxue Liu, Yuqian Wang, Qin Chen, Haoli Ma
Arabinogalactan proteins (AGPs) are a family of extracellular glycoproteins implicated in plant growth and development. With a rapid growth in the number of genomes sequenced in many plant species, the family members of AGPs can now be predicted to facilitate functional investigation. Building upon previous advances in identifying Arabidopsis AGPs, an integrated strategy of systematical AGP screening for "classical" and "chimeric" family members is proposed in this study. A Python script named Finding-AGP is compiled to find AGP-like sequences and filter AGP candidates under the given thresholds...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28152473/combination-of-arabinogalactan-and-curcumin-induces-apoptosis-in-breast-cancer-cells-in-vitro-and-inhibits-tumor-growth-via-overexpression-of-p53-level-in-vivo
#2
Hassan Moghtaderi, Houri Sepehri, Farnoosh Attari
PURPOSE: Increased mortality associated with breast cancer in women has spurred the studies to develop new drugs. Arabinogalactan (AG) and curcumin (Cur) are two natural products broadly explored in cancer therapy. Our major goal in the current study was to assess anticancer properties of combination these reagents in vitro on human breast cancer cells and in vivo utilizing animal model of breast cancer. EXPERIMENTAL DESIGN: We evaluated cell proliferation, apoptosis, cell cycle, and protein expression in vitro on MDA-MB-231 human breast cancer cells...
January 29, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28137704/pollen-tube-access-to-the-ovule-is-mediated-by-glycoprotein-secretion-on-the-obturator-of-apple-malus-%C3%A3-domestica-borkh
#3
Juan M Losada, Maria Herrero
BACKGROUND AND AIMS: Within the ovary, the obturator bridges the pathway of the pollen tube from the style to the ovule. Despite its widespread presence among flowering plants, its function has only been studied in a handful of species, and the molecules involved in pollen tube-obturator cross-talk have not been explored hitherto. This work evaluates the involvement of glucans and glycoproteins on pollen tube growth in the obturator of apple flowers (Malus × domestica) METHODS: Pollen tube kinetics were sequentially examined in the pistil and related to changes occurring on the obturator using histochemistry and inmunocytochemistry...
January 29, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28122511/distribution-of-some-pectic-and-arabinogalactan-protein-epitopes-during-solanum-lycopersicum-l-adventitious-root-development
#4
Katarzyna Sala, Katarzyna Malarz, Peter W Barlow, Ewa U Kurczyńska
BACKGROUND: The adventitious roots (AR) of plants share the same function as primary and lateral roots (LR), although their development is mainly an adaptive reaction to stress conditions. Regeneration of grafted plants is often accompanied by AR formation thus making the grafting technique a good model for studying AR initiation and development and their means of emergence. Pectins and arabinogalactan proteins (AGP) are helpful markers of particular cellular events, such as programmed cell death (PCD), elongation, proliferation or other differentiation events that accompany AR development...
January 25, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28018417/arabinogalactan-proteins-as-interactors-along-the-crosstalk-between-the-pollen-tube-and-the-female-tissues
#5
REVIEW
Ana M Pereira, Ana L Lopes, Sílvia Coimbra
Arabinogalactan proteins (AGPs) have long been considered to be implicated in several steps of the reproductive process of flowering plants. Pollen tube growth along the pistil tissues requires a multiplicity of signaling pathways to be activated and turned off precisely, at crucial timepoints, to guarantee successful fertilization and seed production. In the recent years, an outstanding effort has been made by the plant reproduction scientific community in order to better understand this process. This resulted in the discovery of a fairly substantial number of new players essential for reproduction, as well as their modes of action and interactions...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27979219/correlation-of-the-immunostimulatory-activities-of-honeys-with-their-contents-of-identified-bioactives
#6
Swapna Gannabathula, Geoffrey W Krissansen, Liana Bisson-Rowe, Margot Skinner, Gregor Steinhorn, Ralf Schlothauer
Honeys with unique compositions and properties are worth studying for their health-promoting effects. In order to correlate bioactive content with immunostimulatory activity we compared the abilities of seventy eight New Zealand and non-New Zealand honeys to stimulate blood monocytes to release tumour necrosis factor (TNF)-α, and examined the compositions of selected honeys that had widely varying activities. All the honeys, except for a Malaysian "Amber honey" stimulated the release of TNF-α from monocytes...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27976267/arabinogalactan-proteins-agps-signaling-molecules-of-the-extracellular-matrix-of-plants
#7
E M Heise, B Classen
No abstract text is available yet for this article.
December 2016: Planta Medica
https://www.readbyqxmd.com/read/27976031/arabinogalactan-proteins-containing-uronic-acids-are-essential-molecules-for-growth-processes-in-planta
#8
E M Heise
No abstract text is available yet for this article.
December 2016: Planta Medica
https://www.readbyqxmd.com/read/27893856/spatial-distribution-of-selected-chemical-cell-wall-components-in-the-embryogenic-callus-of-brachypodium-distachyon
#9
Alexander Betekhtin, Magdalena Rojek, Anna Milewska-Hendel, Robert Gawecki, Jagna Karcz, Ewa Kurczynska, Robert Hasterok
Brachypodium distachyon L. Beauv. (Brachypodium) is a species that has become an excellent model system for gaining a better understanding of various areas of grass biology and improving plant breeding. Although there are some studies of an in vitro Brachypodium culture including somatic embryogenesis, detailed knowledge of the composition of the main cell wall components in the embryogenic callus in this species is missing. Therefore, using the immunocytochemical approach, we targeted 17 different antigens of which five were against the arabinogalactan proteins (AGP), three were against extensins, six recognised pectic epitopes and two recognised hemicelluloses...
2016: PloS One
https://www.readbyqxmd.com/read/27888523/the-cotton-%C3%AE-galactosyltransferase-1-galt1-that-galactosylates-arabinogalactan-proteins-participates-in-controlling-fiber-development
#10
Li-Xia Qin, Yun Chen, Wei Zeng, Yang Li, Lu Gao, Deng-Di Li, Antony Bacic, Wen-Liang Xu, Xue-Bao Li
Arabinogalactan-proteins (AGPs) are highly glycosylated proteins which play pivotal roles in diverse developmental processes in plants. Type II AG glycans, mostly O-linked to the hydroxyproline residues of the protein backbone, account for up to 95% w/w of the AGP, but their functions are still largely unclear. Cotton fibers are extremely elongated single-cell trichomes on the seed epidermis. However, little is known of the molecular basis governing the regulation of fiber cell development. Here, we characterized the role of a CAZy glycosyltransferase (GT) family 31 member GhGalT1 in cotton fiber development...
November 26, 2016: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/27884087/a-protease-peptidase-from-culture-medium-of-flammulina-velutipes-that-acts-on-arabinogalactan-protein
#11
Yoshihisa Yoshimi, Yumi Sugawara, Chiaki Hori, Kiyohiko Igarashi, Satoshi Kaneko, Yoichi Tsumuraya, Toshihisa Kotake
Arabinogalactan-proteins (AGPs) are highly diverse plant proteoglycans found on the plant cell surface. AGPs have large arabinogalactan (AG) moieties attached to a core-protein rich in hydroxyproline (Hyp). The AG undergoes hydrolysis by various glycoside hydrolases, most of which have been identified, whereas the core-proteins is presumably degraded by unknown proteases/peptidases secreted from fungi and bacteria in nature. Although several enzymes hydrolyzing other Hyp-rich proteins are known, the enzymes acting on the core-proteins of AGPs remain to be identified...
November 25, 2016: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/27878998/the-transition-from-somatic-to-germline-identity-shows-conserved-and-specialized-features-during-angiosperm-evolution
#12
Jorge Lora, María Herrero, Matthew R Tucker, José I Hormaza
How and why specific plant cells adopt germline identity during ovule development has proved challenging to address, and the pathways that are active in the ovules of basal/early-divergent angiosperms possessing a multilayered nucellus are still unclear. Here, we compare megasporogenesis between two early-divergent angiosperms (Annona cherimola and Persea americana) and the evolutionarily derived Arabidopsis thaliana, studying the three-dimensional spatial position of the megaspore mother cell (MMC), the compositional details of the MMC wall and the location of PIN1 expression...
November 23, 2016: New Phytologist
https://www.readbyqxmd.com/read/27837085/kns4-upex1-a-type-ii-arabinogalactan-%C3%AE-1-3-galactosyltransferase-required-for-pollen-exine-development
#13
Toshiya Suzuki, Joan Oñate Narciso, Wei Zeng, Allison van de Meene, Masayuki Yasutomi, Shunsuke Takemura, Edwin R Lampugnani, Monika S Doblin, Antony Bacic, Sumie Ishiguro
Pollen exine is essential for protection from the environment of the male gametes of seed-producing plants, but its assembly and composition remain poorly understood. We previously characterized Arabidopsis (Arabidopsis thaliana) mutants with abnormal pollen exine structure and morphology that we named kaonashi (kns). Here we describe the identification of the causal gene of kns4 that was found to be a member of the CAZy glycosyltransferase 31 gene family, identical to UNEVEN PATTERN OF EXINE1, and the biochemical characterization of the encoded protein...
January 2017: Plant Physiology
https://www.readbyqxmd.com/read/27811078/dynamics-of-cell-wall-assembly-during-early-embryogenesis-in-the-brown-alga-fucus
#14
Thomas A Torode, Amandine Siméon, Susan E Marcus, Murielle Jam, Marie-Anne Le Moigne, Delphine Duffieux, J Paul Knox, Cécile Hervé
Zygotes from Fucus species have been used extensively to study cell polarization and rhizoid outgrowth, and in this model system cell wall deposition aligns with the establishment of polarity. Monoclonal antibodies are essential tools for the in situ analysis of cell wall glycans, and here we report the characteristics of six monoclonal antibodies to alginates (BAM6-BAM11). The use of these, in conjunction with monoclonal antibodies to brown algal sulfated fucans, has enabled the study of the developmental dynamics of the Fucus zygote cell walls...
November 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27769192/bioinformatic-identification-and-analysis-of-hydroxyproline-rich-glycoproteins-in-populus-trichocarpa
#15
Allan M Showalter, Brian D Keppler, Xiao Liu, Jens Lichtenberg, Lonnie R Welch
BACKGROUND: Hydroxyproline-rich glycoproteins (HRGPs) constitute a plant cell wall protein superfamily that functions in diverse aspects of growth and development. This superfamily contains three members: the highly glycosylated arabinogalactan-proteins (AGPs), the moderately glycosylated extensins (EXTs), and the lightly glycosylated proline-rich proteins (PRPs). Chimeric and hybrid HRGPs, however, also exist. A bioinformatics approach is employed here to identify and classify AGPs, EXTs, PRPs, chimeric HRGPs, and hybrid HRGPs from the proteins predicted by the completed genome sequence of poplar (Populus trichocarpa)...
October 21, 2016: BMC Plant Biology
https://www.readbyqxmd.com/read/27736003/arabinogalactan-proteins-from-baobab-and-acacia-seeds-influence-innate-immunity-of-human-keratinocytes-in-vitro
#16
Abderrakib Zahid, Julie Despres, Magalie Benard, Eric Nguema-Ona, Jerome Leprince, David Vaudry, Christophe Rihouey, Maité Vicré-Gibouin, Azeddine Driouich, Marie-Laure Follet-Gueye
Plant derived arabinogalactan proteins (AGP) were repeatedly confirmed as immunologically as well as dermatologically active compounds. However little is currently known regarding their potential activity towards skin innate immunity. Here, we extracted and purified AGP from acacia (Acacia senegal) and baobab (Adansonia digitata) seeds to investigate their biological effects on the HaCaT keratinocyte cell line in an in vitro system. While AGP from both sources did not exhibit any cytotoxic effect, AGP from acacia seeds enhanced cell viability Moreover, real-time quantitative reverse transcription-polymerase chain reaction (qRT-PCR) analysis showed that AGP extracted from both species induced a substantial overexpression of hBD-2, TLR-5, and IL1-α genes...
October 13, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27702536/natural-killer-cell-mediated-cytotoxicity-is-increased-by-a-type-ii-arabinogalactan-from-anoectochilus-formosanus
#17
Li-Chan Yang, Ching-Yi Lai, Wen-Chuan Lin
This study investigated the effects of a type II arabinogalactan from Anoectochilus formosanus (AGAF) on natural killer (NK) cell-mediated cytotoxicity and the possible underlying mechanisms. This study reported that sustained exposure to AGAF increased NK-92MI cell-mediated cytotoxicity in a time- and concentration-dependent manner, as characterized according to the cellular lactic dehydrogenase leakage from K562 leukemia cells. Additionally, antibody neutralization studies have reported that interferon (IFN)-γ, but not perforin or tumor necrosis factor-α, released by NK-92MI NK cells is crucial in enhancing cytotoxicity through an autocrine loop...
January 2, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27632186/dramatic-secretion-of-recombinant-protein-expressed-in-tobacco-cells-with-a-designer-glycopeptide-tag-is-highly-impacted-by-medium-composition
#18
Ningning Zhang, Maureen Dolan, Di Wu, Gregory C Phillips, Jianfeng Xu
Cell growth medium composition has profound impacts on the O -glycosylation of a "designer" arabinogalactan protein-based module; full glycosylation is essential in directing efficient extracellular secretion of the tagged recombinant protein. Expression of recombinant proteins in plant cells as fusion with a de novo designed hydroxyproline (Hyp)-O-glycosylated peptide (HypGP) tag, termed HypGP engineering technology, resulted in dramatically increased secreted protein yields. This is due to the function of the HypGP tag as a molecular carrier in promoting efficient transport of conjoined proteins into culture media...
December 2016: Plant Cell Reports
https://www.readbyqxmd.com/read/27562432/arabinogalactan-protein-motif-containing-receptor-like-kinases-are-likely-to-play-the-negative-feedback-factor-to-maintain-proper-root-hair-length
#19
Hyung-Taeg Cho
Coordination of the events between cytoplasm and cell wall is necessary for the proper cellular activity of plants. Cell wall-associated receptor kinases are likely to play the interface for the extra-to-internal signaling process. Arabidopsis ROOT HAIR SPECIFIC 10 (RHS10), belonging to the proline-rich extensin-like receptor kinase (PERK) family, is a Ser/Thr protein kinase with arabinogalactan protein (AGP) motifs in its extracellular domain (ECD). RHS10 and other angiosperm PERK homologs are inhibitory in root hair tip growth...
September 2016: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/27561473/structural-characteristics-of-oxalate-soluble-polysaccharides-of-sosnowsky-s-hogweed-heracleum-sosnowskyi-manden
#20
Elena N Makarova, Evgeny G Shakhmatov, Vladimir A Belyy
Arabinogalactan proteins (AGP) and pectic polysaccharides were isolated from above-ground parts of Heracleum sosnowskyi. The structural study has shown that a linear region of the pectic macromolecules consists of 1,4-α-d-galactopyranosyluronan blocks partially methyl esterified and acetylated. The branched region consists of 3-O- and partially 2-O-acetylated rhamnogalacturonan I. Side chains of the RG-I backbone include the regions of arabinogalactan I and branched 1,5-α-l-arabinan. The carbohydrate part of AGP consists of arabinogalactan II with a 1,3-β-d-Galp main chain...
November 20, 2016: Carbohydrate Polymers
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