hexokinase/oryza sativa

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Structure, expression, and functional analysis of the hexokinase gene family in rice (Oryza sativa L.).

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Hexokinase (HXK) is a dual-function enzyme that both phosphorylates hexose to form hexose 6-phosphate and plays an important role in sugar sensing and signaling. To investigate the roles of hexokinases in rice growth and development, we analyzed rice sequence databases and isolated ten rice

Rare sugar D-allose suppresses gibberellin signaling through hexokinase-dependent pathway in Oryza sativa L.

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One of the rare sugars, D-allose, which is the epimer of D-glucose at C3, has an inhibitory effect on rice growth, but the molecular mechanisms of the growth inhibition by D-allose were unknown. The growth inhibition caused by D-allose was prevented by treatment with hexokinase inhibitors,

Phosphorylation of D-allose by hexokinase involved in regulation of OsABF1 expression for growth inhibition in Oryza sativa L.

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We previously reported that a rare sugar D-allose, which is the D-glucose epimer at C3, inhibits the gibberellin-dependent responses such as elongation of the second leaf sheath and induction of α-amylase in embryo-less half seeds in rice (Fukumoto et al. 2011). D-Allose suppresses expressions of

Role of rice cytosolic hexokinase OsHXK7 in sugar signaling and metabolism.

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We characterized the function of the rice cytosolic hexokinase OsHXK7 (Oryza sativa Hexokinase7), which is highly upregulated when seeds germinate under O2 -deficient conditions. According to transient expression assays that used the promoter:luciferase fusion construct, OsHXK7 enhanced the glucose

Evidence for a role of hexokinases as conserved glucose sensors in both monocot and dicot plant species.

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The role of the hexokinases (HXKs) as glucose (Glc) sensors has been mainly demonstrated for Arabidopsis (Arabidopsis thaliana) HXK1 (AtHXK1) but has yet to be shown in other plant species. In our recent publication, we reported that two rice (Oryza sativa) HXKs, OsHXK5 and OsHXK6, also function as

Partial purification of tightly bound mitochondrial hexokinase from maize (Zea mays L.) root membranes.

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In mammals, hexokinase (HK) is strategically located at the outer membrane of mitochondria bound to the porin protein. The mitochondrial HK is a crucial modulator of apoptosis and reactive oxygen species generation. In plants, these properties related to HK are unknown. In order to better understand

Novel gene encoding a Ca2+-binding protein and under hexokinase-dependent sugar regulation.

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A cDNA encoding a predicted 15-kDa protein was earlier isolated from sugar-induced genes in rice embryos (Oryza sativa L.) by cDNA microarray analysis. Here we report that this cDNA encodes a novel Ca2+-binding protein, named OsSUR1 (for Oryza sativa sugar-up-regulated-1). The recombinant OsSUR1

Role of the rice hexokinases OsHXK5 and OsHXK6 as glucose sensors.

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The Arabidopsis (Arabidopsis thaliana) hexokinase 1 (AtHXK1) is recognized as an important glucose (Glc) sensor. However, the function of hexokinases as Glc sensors has not been clearly demonstrated in other plant species, including rice (Oryza sativa). To investigate the functions of rice

Conformational Characteristics of Rice Hexokinase OsHXK7 as a Moonlighting Protein involved in Sugar Signalling and Metabolism.

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Hexokinase (HXK) as a moonlighting protein involves in glucose metabolism and signalling to regulate growth and development in plants. Therefore, the clarification for the structural properties of OsHXK7 (Oryza sativa Hexokinase 7) is essential to understand its role mechanism associated with the

The buffering capacity of stems: genetic architecture of nonstructural carbohydrates in cultivated Asian rice, Oryza sativa.

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Harnessing stem carbohydrate dynamics in grasses offers an opportunity to help meet future demands for plant-based food, fiber and fuel production, but requires a greater understanding of the genetic controls that govern the synthesis, interconversion and transport of such energy reserves. We map

A Quantitative Acetylomic Analysis of Early Seed Development in Rice (Oryza sativa L.).

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PKA (protein lysine acetylation) is a critical post-translational modification that regulates various developmental processes, including seed development. However, the acetylation events and dynamics on a proteomic scale in this process remain largely unknown, especially in rice early seed

Sugar coordinately and differentially regulates growth- and stress-related gene expression via a complex signal transduction network and multiple control mechanisms.

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In plants, sugars are required to sustain growth and regulate gene expression. A large set of genes are either up- or down-regulated by sugars; however, whether there is a common mechanism and signal transduction pathway for differential and coordinated sugar regulation remain unclear. In the

Enzymes of carbohydrate metabolism in the developing rice grain.

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The levels of reducing and nonreducing sugars, starch, soluble protein, and selected enzymes involved in the metabolism of sucrose, glucose-1-P, and glucose nucleotides were assayed in dehulled developing rice grains (Oryza sativa L. line IR1541-76-3) during the first 3 weeks after flowering. The

Diauxic Growth in Rice Suspension Cells Grown on Mixed Carbon Sources of Acetate and Glucose.

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Diauxic growth was observed in rice (Oryza sativa L.) suspension cells growing on acetate (10 mM) and glucose (10 mM). Cells used acetate during the first growth phase and the acetate level in the medium was rapidly decreased, whereas the level of glucose remained essentially unchanged. After

OsAGO2 controls ROS production and the initiation of tapetal PCD by epigenetically regulating OsHXK1 expression in rice anthers.

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Proteins of the ARGONAUTE (AGO) family function in the epigenetic regulation of gene expression. Although the rice (Oryza sativa) genome encodes 19 predicted AGO proteins, few of their functions have thus far been characterized. Here, we show that the AGO protein OsAGO2 regulates anther

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