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학술저널
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한국식물생명공학회 Journal of Plant Biotechnology Journal of Plant Biotechnology 제33권 제2호
발행연도
2006.1
수록면
123 - 131 (9page)

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hinese cabbage (Brassica rapa ssp. pekinensis) is one of the most important vegetable crops in Korea and other East Asian countries. Cytosolic fructose-1,6-bisphosphatase (cytFBPase) is a key enzyme in sucrose biosynthesis, which controls the sucrose levels as well as the productivity of plants. The Chinese cabbage cytFBPase gene, BrFBPase, encodes the 340 amino acid polypeptide, giving a theoretical molecular weight of 37.2 kD and a isolectric point of 5.4. BrFBPase showed high sequence identity with Brassica homologs and its functional domains, such as F2,6P2 binding site or active site and F6P binding site, were highly conserved in diverse sources of organisms. Although the genome of Chinese cabbage seemed to be triplicated, BrFBPase appears to be a single copy gene. The expression of BrFBPase was examined at transcript and protein levels under various conditions. BrFBPase expression was observed only in photosynthetic source tissue, not in sink tissue. The expression was slightly higher during the day than at night, and it showed a diurnal cycle with circadian rhythmicity. Short-term exposure to low temperature inhibited the expression of the BrFBPase, while long-term exposure increased the expression, supporting that sugar levels are high in late autumn when temperatures are low.

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