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The presence of two alkaline/neutral invertases (Inv-A and Inv-B) in the filaments of Nostoc (also named Anabaena) sp. strain PCC 7120 and the involvement of sucrose metabolism in nitrogen fixation led us to investigate the physiological function of those isoforms in cells growing under different nitrogen sources. The highest expression level of each encoding gene was obtained in the presence of ammonium...
It has been reported that higher plants and cyanobacteria synthesize sucrose (Suc) by a similar sequential action of sucrose-phosphate synthase (SPS) and sucrose-phosphate phosphatase (SPP). In the genome of the marine unicellular cyanobacterium Synechococcus sp. PCC 7002 there is a sequence that was not annotated as a putative SPP encoding gene (sppA), although the sequence was available. In this...
Higher plants and cyanobacteria metabolize sucrose (Suc) by a similar set of enzymes. Suc synthase (SuS, UDP-glucose: d-fructose 2-α-d-glucosyl transferase, EC 2.4.1.13) catalyses the synthesis and cleavage of Suc, and in higher plants, it plays an important role in polysaccharides biosynthesis and carbon allocation. In this work, we have studied the functional relationship between SuS and the metabolism...
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