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PMID: 22303248 Published · ppublish English Journal Article

Trehalose Metabolites in Arabidopsis-elusive, active and central.

The arabidopsis book ·Vol. 7 ·2009-00-00 ·Pages e0122

Schluepmann H, Paul M

Abstract

Trehalose is an alpha, alpha-1, 1-linked glucose disaccharide. In plants, trehalose is synthesized in two steps. Firstly, trehalose-6-phosphate synthase (TPS) converts UDP-glucose and glucose-6-phosphate to trehalose-6-phosphate (T6P); secondly, T6P-phosphatase (TPP) converts T6P into trehalose and Pi. Trehalose is further cleaved into glucose by trehalase. In extracts of most plants, including Arabidopsis, levels of both trehalose and T6P are low, nearing detection limits, and this has delayed research into their function. Trehalose is transported widely in plants, but transport of T6P is not thought to occur except possibly at the subcellular level. Feeding trehalose to Arabidopsis seedlings alters carbon allocation with massive starch accumulation in cotyledons and leaves and absence of starch and growth in shoot and root apices.The Arabidopsis genome has experienced extensive radiation of genes likely encoding enzymes of T6P metabolism: 4 and 10 genes are found with homology to TPS and TPP respectively and 7 genes are found with homology to both TPS and TPP. Complementation of Saccharomyces cerevisiae mutants has shown that AtTPS1, AtTPPA and AtTPPB are functional enzymes. In contrast just a single gene encoding a protein with trehalase activity has been found. Whilst most TPS proteins appear cytosolic, strikingly, some TPPs appear targeted to chloroplasts; trehalase on the other hand is extracellular. Transporters of trehalose and T6P have yet to be described. Arabidopsis tps1 mutants are embryo lethal and results suggest that T6P is essential for several other steps in development including root growth and floral transition. Accordingly, altering T6P content has a profound effect on plant habitus and impacts metabolite profiles, sugar utilization and photosynthesis. These large effects have hindered dissection of cause and effect. In contrast, plants with large alterations in sucrose-6-phosphate concentrations are indistinguishable from wild type, suggesting very different functions for these compounds. Recently, T6P at low micromolar concentrations has been shown in vitro and in vivo to inhibit SnRK1 of the SNF1/AMPK group of protein kinases. This supports a function for T6P as a sugar signaling molecule integrating metabolism and development in plants in relation to carbon supply.Genetic engineering of Arabidopsis as well as tobacco, potato and rice with TPS or TPS/TPP protein fusions reveals that trehalose metabolism also mediates multiple abiotic stress tolerances. Trehalose applications also mediate biotic stress resistances. Both Escherichia coli and Saccharomyces cerevisiae TPS/TPP protein fusions can be used to engineer stress tolerance suggesting that metabolites rather than proteins of the trehalose pathway are key stress tolerance elicitors. Results underscore the central role of trehalose metabolites in integrating carbon metabolism and stress responses with plant development.

Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Schluepmann Henriette
Paul Matthew
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Article Info
Journal
The arabidopsis book
Abbr.
Arabidopsis Book
ISSN
1543-8120
DOI
10.1199/tab.0122
Published
2009-00-00
Epub
2009-00-14
Pages
e0122
Language
English
Region
United States
NLM ID
101214894
PMCID
PMC3243345
Grants
Biotechnology and Biological Sciences Research Council · BB/D006112/1 · United Kingdom
Biotechnology and Biological Sciences Research Council · BBS/E/C/00005997 · United Kingdom
External Links
PubMed source DOI: 10.1199/tab.0122 PMC Full Text
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