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Biotechnol Lett. 2003 Sep;25(18):1525-30.

A cDNA encoding vacuolar type beta-D-fructofuranosidase (Os beta fruct3) of rice and its expression in Pichia pastoris.

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Institute of Agricultural Chemistry, National Taiwan University No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan.


A vacuolar type beta-D-fructofuranosidase (Os beta fruct3) was cloned from etiolated rice seedlings cDNA library. It encodes an open reading frame of 688 residues. The deduced amino acid sequence had 58% identity to the vacuolar type beta-D-fructofuranosidase of maize (Ivr1). Os beta fruct3 exists as a single copy per genome. Northern analyses showed that Os beta fruct3 undergoes organ-specific expression and is involved in the adjustment of plant responses to environmental signals and metabolizable sugars. Os beta fruct3 was also heterologously expressed in Pichia pastoris. The recombinant proteins were confirmed to be a vacuolar type beta-D-fructofuranosidase.

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