Sugar transporters in higher plants – a diversity of roles and complex regulation

Williams, Lorraine E.; Lemoine, Rémi; Sauer, Norbert

doi:10.1016/s1360-1385(00)01681-2

Cited by 363 publications

(303 citation statements)

References 44 publications

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“…These molecules include the insulin-like growth factors from vertebrates, bombyxins from silkworm, molluscan insulin-like peptides, and others (14). In spite of the many reports on the effects of extracts from plant parts on the reduction of blood sugar levels of diabetic animals (4,16,17), no function for insulin has been suggested by workers in the fields of glucose mobilization or transport (18)(19)(20)(21). Nevertheless, it has been shown recently that insulin increases seed germination (22; Oliveira AEA and Xavier-Filho J, unpublished results), accelerates synthesis of ribosomal proteins in germinating maize embryos (23,24), and increases the activity of glyoxysomal enzymes in maize (22).…”

Section: Discussionmentioning

confidence: 99%

“…Besides pancreatic tissues in vertebrates, insulin has been detected in different tissues of members of several other phyla, suggesting that pathways in which it is involved have been evolutionarily conserved (12)(13)(14)(15). In plants, apart from the many reports on the lowering of blood sugar levels in diabetic animals by extracts of plant parts (4,16,17), no place for insulin as a member of signaling pathways has been suggested by researchers in the fields of glucose mobilization or transport (18)(19)(20)(21). Nevertheless, it has been shown that added insulin increases germination of some seeds (22; Oliveira AEA and Xavier-Filho J, unpublished results), accelerates synthesis of ribosomal proteins in germinating maize embryos (23,24), and increases the activity of glyoxysomal enzymes involved in the conversion of fat to carbohydrate in maize (22).…”

Section: Introductionmentioning

confidence: 99%

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The leaves of green plants as well as a cyanobacterium, a red alga, and fungi contain insulin-like antigens

Silva

Santos

Azevedo

et al. 2002

Braz J Med Biol Res

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We report the detection of insulin-like antigens in a large range of species utilizing a modified ELISA plate assay and Western blotting. We tested the leaves or aerial parts of species of Rhodophyta (red alga), Bryophyta (mosses), Psilophyta (whisk ferns), Lycopodophyta (club mosses), Sphenopsida (horsetails), gymnosperms, and angiosperms, including monocots and dicots. We also studied species of fungi and a cyanobacterium, Spirulina maxima. The wide distribution of insulin-like antigens, which in some cases present the same electrophoretic mobility as bovine insulin, together with results recently published by us on the amino acid sequence of an insulin isolated from the seed coat of jack bean (Canavalia ensiformis) and from the developing fruits of cowpea (Vigna unguiculata), suggests that pathways depending on this hormone have been conserved through evolution.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The leaves of green plants as well as a cyanobacterium, a red alga, and fungi contain insulin-like antigens

Silva

Santos

Azevedo

et al. 2002

Braz J Med Biol Res

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“…The G. sulphuraria genome encodes at least nine distinct putative monosaccharide transporters Seed plants possess three distinct families of sugar transporters: (i) disaccharide transporters that primarily catalyze sucrose transport; (ii) monosaccharide transporters mediate the transport of a variable range of monosaccharides (Bu¨ttner and Sauer, 2000;Williams et al, 2000); and (iii) a maltose transporter that represents a novel type of sugar transporter (Niittyla et al, 2004). In seed plants, transporters play crucial roles in the intra-and intercellular and longdistance transport of sugars throughout the plant.…”

Section: Solute Transporters In G Sulphurariamentioning

confidence: 99%

EST-analysis of the thermo-acidophilic red microalga Galdieriasulphuraria reveals potential for lipid A biosynthesis and unveils the pathway of carbon export from rhodoplasts

et al. 2004

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When we think of extremophiles, organisms adapted to extreme environments, prokaryotes come to mind first. However, the unicellular red micro-alga Galdieria sulphuraria (Cyanidiales) is a eukaryote that can represent up to 90% of the biomass in extreme habitats such as hot sulfur springs with pH values of 0-4 and temperatures of up to 56°C. This red alga thrives autotrophically as well as heterotrophically on more than 50 different carbon sources, including a number of rare sugars and sugar alcohols. This biochemical versatility suggests a large repertoire of metabolic enzymes, rivaled by few organisms and a potentially rich source of thermo-stable enzymes for biotechnology. The temperatures under which this organism carries out photosynthesis are at the high end of the range for this process, making G. sulphuraria a valuable model for physical studies on the photosynthetic apparatus. In addition, the gene sequences of this living fossil reveal much about the evolution of modern eukaryotes. Finally, the alga tolerates high concentrations of toxic metal ions such as cadmium, mercury, aluminum, and nickel, suggesting potential application in bioremediation. To begin to explore the unique biology of G. sulphuraria, 5270 expressed sequence tags from two different cDNA libraries have been sequenced and annotated. Particular emphasis has been placed on the reconstruction of metabolic pathways present in this organism. For example, we provide evidence for (i) a complete pathway for lipid A biosynthesis; (ii) export of triose-phosphates from rhodoplasts; (iii) and absence of eukaryotic hexokinases. Sequence data and additional information are available at http://genomics.msu.edu/galdieria.

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“…The induction of two antioxidant genes suggests an increase in oxidative stress because cold-acclimating conditions do not result in the cessation of photosynthesis such that superoxide radicals were still being generated (Wu et al, 1999). Kiyosue et al (1998) observed that dehydration and chilling stress (4°C) induced a cDNA clone (ERD6) from Arabidopsis encoding a putative sugar transporter protein belonging to a multigene family (Williams et al, 2000). We also identified a sugarcane EST encoding a putative sugar transporter protein that was induced after 12 to 48 h of cold exposure (Table II).…”

Section: Cold-responsive Genes In Sugarcanementioning

confidence: 99%

RNA Expression Profiles and Data Mining of Sugarcane Response to Low Temperature

et al. 2003

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Tropical and subtropical plants are generally sensitive to cold and can show appreciable variation in their response to cold stress when exposed to low positive temperatures. Using nylon filter arrays, we analyzed the expression profile of 1,536 expressed sequence tags (ESTs) of sugarcane (Saccharum sp. cv SP80-3280) exposed to cold for 3 to 48 h. Thirty-four cold-inducible ESTs were identified, of which 20 were novel cold-responsive genes that had not previously been reported as being cold inducible, including cellulose synthase, ABI3-interacting protein 2, a negative transcription regulator, phosphate transporter, and others, as well as several unknown genes. In addition, 25 ESTs were identified as being down-regulated during cold exposure. Using a database of cold-regulated proteins reported for other plants, we searched for homologs in the sugarcane EST project database (SUCEST), which contains 263,000 ESTs. Thirty-three homologous putative coldregulated proteins were identified in the SUCEST database. On the basis of the expression profiles of the cold-inducible genes and the data-mining results, we propose a molecular model for the sugarcane response to low temperature.

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Sugar transporters in higher plants – a diversity of roles and complex regulation

Cited by 363 publications

References 44 publications

The leaves of green plants as well as a cyanobacterium, a red alga, and fungi contain insulin-like antigens

The leaves of green plants as well as a cyanobacterium, a red alga, and fungi contain insulin-like antigens

EST-analysis of the thermo-acidophilic red microalga Galdieriasulphuraria reveals potential for lipid A biosynthesis and unveils the pathway of carbon export from rhodoplasts

RNA Expression Profiles and Data Mining of Sugarcane Response to Low Temperature

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