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izvor podataka: crosbi

The Role of Carbohydrate-Metabolizing Enzymes in Sugar Sensing and Differentiation in Sugar Beet Cell Lines (CROSBI ID 159808)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Pavoković, Dubravko ; Omarszad, Osman ; Maury, Stéphane ; Joseph, Claude ; Delaunay, Alain ; Krsnik-Rasol, Marijana ; Hagège, Daniel The Role of Carbohydrate-Metabolizing Enzymes in Sugar Sensing and Differentiation in Sugar Beet Cell Lines // Food technology and biotechnology, 49 (2011), 4; 435-446

Podaci o odgovornosti

Pavoković, Dubravko ; Omarszad, Osman ; Maury, Stéphane ; Joseph, Claude ; Delaunay, Alain ; Krsnik-Rasol, Marijana ; Hagège, Daniel

engleski

The Role of Carbohydrate-Metabolizing Enzymes in Sugar Sensing and Differentiation in Sugar Beet Cell Lines

Plant development is influenced by changes in the levels and types of sugars pro- duced metabolically. The normal (N), habituated organogenic (HO) and habituated non- organogenic (HNO) sugar beet cell lines originate from the same mother plant but exhibit distinct levels of morphogenesis and differentiation, and contain different levels of simple carbohydrates. We aim to elucidate whether differences in the abundance and activity of enzymes involved in carbohydrate metabolism and sugar sensing/signalling help explain the different carbohydrate profiles and differentiation states of the cell lines. Using 13C NMR spectroscopy to analyze cultures of the cell lines over 28 days, we found that N cells accumulated sucrose ; HO cells sucrose, glucose and fructose ; and HNO cells glucose and fructose. Of three invertase isoforms, the activity of cell wall invertase (CWI) was highest in all the cell lines, and CWI activity was greatest in HNO line. The specific accumulation of intracellular carbohydrates during subculture correlated strongly with CWI activity but less so with the vacuolar and cytoplasmic invertase isoforms, or with sucrose synthase activity. Cell lines showed differences in how sugars regulated invertase and sucrose syn- thase activity. The role of sugar sensing in the regulation of CWI activity was investigated in the cell lines using glucose and sucrose, as well as carbohydrate analogues such as mannitol, 2-O-deoxyglucose and 3-O-methylglucose. Differences in the regulation of CWI activity by carbohydrates across the three cell lines suggest that CWI can be fine-tuned according to the specific carbohydrate requirements of each line during growth. Differen- ces in sugar signalling pathways across the cell lines were explored using glucose and sucrose in the presence of inhibitors of protein kinases or phosphatases. Taken together, our findings suggest that specific regulation of CWI activity plays an important role in determining the intracellular carbohydrate levels of sugar beet cell lines, and possibly their differentiation state as well.

differentiation – invertases – sucrose synthase - NMR – carbohydrate metabolism

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Podaci o izdanju

49 (4)

2011.

435-446

objavljeno

1330-9862

Povezanost rada

Biologija

Poveznice
Indeksiranost