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maltotriose/arabidopsis
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7 resultados
Inhibition of Arabidopsis chloroplast β-amylase BAM3 by maltotriose suggests a mechanism for the control of transitory leaf starch mobilisation.
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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
Feedback inhibition of starch degradation in Arabidopsis leaves mediated by trehalose 6-phosphate.
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Many plants accumulate substantial starch reserves in their leaves during the day and remobilize them at night to provide carbon and energy for maintenance and growth. In this paper, we explore the role of a sugar-signaling metabolite, trehalose-6-phosphate (Tre6P), in regulating the accumulation
Blocking the metabolism of starch breakdown products in Arabidopsis leaves triggers chloroplast degradation.
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In most plants, a large fraction of photo-assimilated carbon is stored in the chloroplasts during the day as starch and remobilized during the subsequent night to support metabolism. Mutations blocking either starch synthesis or starch breakdown in Arabidopsis thaliana reduce plant growth. Maltose
Repression of both isoforms of disproportionating enzyme leads to higher malto-oligosaccharide content and reduced growth in potato.
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Two glucanotransferases, disproportionating enzyme 1 (StDPE1) and disproportionating enzyme 2 (StDPE2), were repressed using RNA interference technology in potato, leading to plants repressed in either isoform individually, or both simultaneously. This is the first detailed report of their combined
Genetic and isotope ratio mass spectrometric evidence for the occurrence of starch degradation and cycling in illuminated Arabidopsis leaves.
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Although there is a great wealth of data supporting the occurrence of simultaneous synthesis and breakdown of storage carbohydrate in many organisms, previous 13CO2 pulse-chase based studies indicated that starch degradation does not operate in illuminated Arabidopsis leaves. Here we show that
Characterization of d-Enzyme (4-alpha-Glucanotransferase) in Arabidopsis Leaf.
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Two major forms of d-enzyme (4-alpha-glucanotransferase, EC 2.4.1.25) were successfully separated from most of the amylase activity using FPLC-Mono Q column chromatography. Transfer of a maltosyl group was observed upon the incubation of d-enzyme with maltotriose and d-[U-(14) C]glucose. About 4.5%
Structural Dissection of the Maltodextrin Disproportionation Cycle of the Arabidopsis Plastidial Disproportionating Enzyme 1 (DPE1).
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The degradation of transitory starch in the chloroplast to provide fuel for the plant during the night requires a suite of enzymes that generate a series of short chain linear glucans. However, glucans of less than four glucose units are no longer substrates for these enzymes, whereas export from
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