Mol. Cells 2009; 27(6): 641~649  DOI: 10.1007/s10059-009-0085-0
Altered Expression of Pyrophosphate:Fructose-6-Phosphate 1-Phosphotransferase Affects the Growth of Transgenic Arabidopsis Plants
Hyemin Lim1, Man-Ho Cho, Jong-Seong Jeon, Seong Hee Bhoo, Yong-Kook Kwon, and Tae-Ryong Hahn
Received December 14, 2009; Revised April 15, 2009; Accepted April 20, 2009.; Published online June 12, 2009.
© The Korean Society for Molecular and Cellular Biology. All rights reserved.

ABSTRACT
Pyrophosphate:fructose-6-phosphate 1-phosphotransferase (PFP) catalyzes the reversible interconversion of fructose-6-phosphate and fructose-1,6-bisphosphate, a key step in the regulation of the metabolic flux toward glycolysis or gluconeogenesis. To examine the role of PFP in plant growth, we have generated transgenic Arabidopsis plants that either overexpress or repress Arabidopsis PFP subunit genes. The overexpressing lines displayed increased PFP activity and slightly faster growth relative to wild type plants, although their photosynthetic activities and the levels of metabolites appeared not to have significantly changed. In contrast, the RNAi lines showed significantly retarded growth in parallel with the reduced PFP activity. Analysis of photosynthetic activity revealed that the growth retardation phenotype of the RNAi lines was ac-companied by the reduced rates of CO2 assimilation. Microarray analysis of our transgenic plants further revealed that the altered expression of AtPFPβ affects the expression of several genes involved in diverse physiological processes. Our current data thus suggest that PFP is important in carbohydrate metabolism and other cellular processes.
Keywords: carbohydrate metabolism, plant growth, pyrophosphate:fructose-6-phosphate 1-phosphotransferase, transgenic plants

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