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[MEASUREMENT OF GLOMERULAR FUNCTION BY PLASMA DECREASE OF A SUBSTANCE ANALOGOUS TO INULIN (POLYFRUCTOSAN-S). CLINICAL IMPORTANCE AND COMPARISON WITH CLASSICAL GLOMERULAR CLERANCE].

A FALBRIARD·R ZENDER
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FructansGlomerular Filtration RateHumansInulinKidney Function TestsKidney GlomerulusPolysaccharidesGLOMERULAR FILTRATION RATEKIDNEY FUNCTION TESTSPOLYSACCHARIDESJournal Article

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A FALBRIARD, R ZENDER. 1964. [MEASUREMENT OF GLOMERULAR FUNCTION BY PLASMA DECREASE OF A SUBSTANCE ANALOGOUS TO INULIN (POLYFRUCTOSAN-S). CLINICAL IMPORTANCE AND COMPARISON WITH CLASSICAL GLOMERULAR CLERANCE].. https://doi.org/10.1159/000179341

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PubMed2000

Fructan accumulation induced by nitrogen deficiency in barley leaves correlates with the level of sucrose:fructan 6-fructosyltransferase mRNA.

Hydroponically cultivated barley plants were exposed to nitrogen (N)-deficiency followed by N-resupply. Metabolic and genetic regulation of fructan accumulation in the leaves were investigated. Fructan accumulated in barley leaves under N-deficiency was mobilized during N-resupply. The enhanced total activity of fructan-synthesizing enzymes, sucrose:sucrose 1-fructosyltransferase (EC 2.4.1.99) and sucrose:fructan 6-fructosyltransferase (6-SFT; EC 2.4. 1.10) caused by N-deficiency decreased with the mobilization of fructan during N-resupply. The activity of the barley fructan-degrading enzyme, fructan exohydrolyase (EC 3.2.1.80) was less affected by the N status. The low level of foliar soluble acid invertase activity under N-deficiency conditions was maintained during the commencement of N-resupply but increased subsequently. Further analyses by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, western blot and northern blot demonstrated that the fructan accumulation and the total activity of fructan-synthesizing enzymes correlated with the 6-SFT mRNA level. We suggest that the changes in fructan levels under N stress are intimately connected with the regulation of fructan synthetic rate which is mostly controlled by 6-SFT.

Fructans↗
PubMed1997

Fructan synthesis in transgenic tobacco and chicory plants expressing barley sucrose: fructan 6-fructosyltransferase.

We have recently cloned a cDNA encoding sucrose:fructan 6-fructosyltransferase (6-SFT), a key enzyme of fructan synthesis forming the beta-2,6 linkages typical of the grass fructans, graminans and phleins [Sprenger et al. (1995) Proc. Natl. Acad. Sci. USA 92, 11652-11656]. Here we report functional expression of 6-SFT from barley in transgenic tobacco and chicory. Transformants of tobacco, a plant naturally unable to form fructans, synthesized the trisaccharide kestose and a series of unbranched fructans of the phlein type (beta-2,6 linkages). Transformants of chicory, a plant naturally producing only unbranched fructans of the inulin type (beta-2,1 linkages), synthesized in addition branched fructans of the graminan type, particularly the tetrasaccharide bifurcose which is also a main fructan in barley leaves.

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