Cytosolic heteroglycans in photoautotrophic and in heterotrophic plant cells

Cytosolic heteroglycans (HG) are essential for the conversion of starch-derived maltose to sucrose or other metabolites. In easily reversible reactions, two glucosyl transferases, the transglucosidase (DPE2) and the phosphorylase isozyme (Pho2/PHS2), utilize HG both as glucosyl donor and acceptor.