TY  - JOUR
A1  - Fettke, Jörg
A1  - Malinova, Irina
A1  - Eckermann, Nora
A1  - Steup, Martin
T1  - Cytosolic heteroglycans in photoautotrophic and in heterotrophic plant cells
N2  - In plants several 'starch-related' enzymes exist as plastid- and cytosol-specific isoforms and in some cases the extraplastidial isoforms represent the majority of the enzyme activity. Due to the compartmentation of the plant cells, these extraplastidial isozymes have no access to the plastidial starch granules and, therefore, their in vivo function remained enigmatic. Recently, cytosolic heteroglycans have been identified that possess a complex pattern of the monomer composition and glycosidic bonds. The glycans act both as acceptors and donors for cytosolic glucosyl transferases. In autotrophic tissues the heteroglycans are essential for the nocturnal starch-sucrose conversion. In this review we summarize the current knowledge of these glycans, their interaction with glucosyl transferases and their possible cellular functions. We include data on the heteroglycans in heterotrophic plant tissues and discuss their role in intracellular carbon fluxes that originate from externally supplied carbohydrates.
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/00319422
U6  - https://doi.org/10.1016/j.phytochem.2009.03.016
SN  - 0031-9422
ER  -