Sucrose Phosphate Synthase, a Key Enzyme for Sucrose Biosynthesis in Plants
نویسندگان
چکیده
منابع مشابه
Role and Regulation of Sucrose-phosphate Synthase in Higher Plants.
Sucrose-phosphate synthase (SPS; E.C. 2.4.1.14) is the plant enzyme thought to play a major role in sucrose biosynthesis. In photosynthetic and nonphotosynthetic tissues, SPS is regulated by metabolites and by reversible protein phosphorylation. In leaves, phosphorylation modulates SPS activity in response to light/dark signals and end-product accumulation. SPS is phosphorylated on multiple ser...
متن کاملThe biosynthesis of sucrose phosphate.
The enzymic formation of sucrose from UDPGl and fructose has been described in the preceding paper (1). While some preparations of the enzyme were found to be almost devoid of action of fructose-6-phosphate, other extracts catalyzed the formation of free sucrose either from fructose or from its phosphate. Since these extracts contain phosphatase, it seemed likely that the action on fructose pho...
متن کاملSucrose phosphate synthase and sucrose accumulation at low temperature.
The influence of growth temperature on the free sugar and sucrose phosphate synthase content and activity of spinach (Spinacia oleracea) leaf tissue was studied. When plants were grown at 25 degrees C for 3 weeks and then transferred to a constant 5 degrees C, sucrose, glucose, and fructose accumulated to high levels during a 14-d period. Predawn sugar levels increased from 14- to 20-fold over ...
متن کاملElevated sucrose-phosphate synthase activity in
Constitutive over-expression of a maize sucrosephosphate synthase (SPS) gene in tobacco (Nicotiana tabacum) had major effects on leaf carbohydrate budgets with consequences for whole plant development. Transgenic tobacco plants ̄owered earlier and had greater ̄ower numbers than wild-type plants. These changes were not linked to modi®ed source leaf carbon assimilation or carbon export, although ...
متن کاملCircadian Regulation of Sucrose Phosphate Synthase Activity
Sucrose phosphate synthase (SPS), a key enzyme in sucrose biosynthesis, is regulated by protein phosphorylation and shows a circadian pattern of activity in tomato. SPS is most active in its dephosphorylated state, which normally coincides with daytime. Applying okadaic acid, a potent protein phosphatase inhibitor, prevents SPS activation. More interesting is that a brief treatment with cyclohe...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1991
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.96.2.473