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PLANT PHYSIOLOGY , Vol 110, Issue 4 1167-1175, Copyright © 1996 by American Society of Plant Biologists

BIOCHEMISTRY AND ENZYMOLOGY

Purification and Characterization of the Enzymes of Fructan Biosynthesis in Tubers of Helianthus tuberosus Colombia (II. Purification of Sucrose:Sucrose 1-Fructosyltransferase and Reconstitution of Fructan Synthesis in Vitro with Purified Sucrose:Sucrose 1-Fructosyltransferase and Fructan:Fructan 1-Fructosyltransferase)

A. J. Koops and H. H. Jonker
Department of Cell Biology, Agricultural Research Department, Centre for Plant Breeding and Reproduction Research, P.O. Box 16, NL-6700 AA Wageningen, The Netherlands

Sucrose:sucrose 1-fructosyltransferase (1-SST), an enzyme involved in fructan biosynthesis, was purified to homogeneity from tubers of Helianthus tuberosus that were harvested in the accumulation phase. Gel filtration under native conditions predicted a molecular mass of about 67 kD. Electrophoresis or gel filtration under denaturing conditions yielded a 27- and a 55-kD fragment. 1-SST preferentially catalyzed the conversion of sucrose into the trisaccharide 1-kestose (GF2). Other reactions catalyzed by 1-SST at a lower rate were self-transfructosylations with GF2 and 1,1-nystose (GF3) as substrates yielding GF3 and 1,1,1-fructosylnystose, respectively, as products. 1-SST also catalyzed the removal of the terminal fructosyl unit from both GF2 and GF3, which resulted in the release of sucrose and GF2, respectively, and free Fru. The purified enzyme did not display [beta]-fructosidase activity. An enzyme mixture of purified 1-SST and fructan:fructan 1-fructosyltransferase, both isolated from tubers, was able to synthesize fructans up to a degree of polymerization of at least 13 with sucrose as a sole substrate.


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