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- W2004402427 abstract "ABSTRACT Anabaena variabilis grows heterotrophically using fructose, while the close relative Anabaena sp. strain PCC 7120 does not. Introduction of a cluster of genes encoding a putative ABC transporter, herein named frtRABC , into Anabaena sp. strain PCC 7120 on a replicating plasmid allowed that strain to grow in the dark using fructose, indicating that these genes are necessary and sufficient for heterotrophic growth. FrtR, a putative LacI-like regulatory protein, was essential for heterotrophic growth of both cyanobacterial strains. Transcriptional analysis revealed that the transport system was induced by fructose and that in the absence of FrtR, frtA was very highly expressed, with or without fructose. In the frtR mutant, fructose uptake was immediate, in contrast to that in the wild-type strain, which required about 40 min for induction of transport. In the frtR mutant, high-level expression of the fructose transporter resulted in cells that were extremely sensitive to fructose. Even in the presence of the inducer, fructose, expression of frtA was low in the wild-type strain compared to that in the frtR mutant, indicating that FrtR repressed the transporter genes even in the presence of fructose. FrtR bound to the upstream region of frtA , but binding was not visibly altered by fructose, further supporting the hypothesis that fructose has only a modest effect in relieving repression of frtA by FrtR. A. variabilis grew better with increasing concentrations of fructose up to 50 mM, showing increased cell size and heterocyst frequency. Anabaena sp. strain PCC 7120 did not show any of these changes when it was grown with fructose. Thus, although Anabaena sp. strain PCC 7120 could take up fructose and use it in the dark, fructose did not improve growth in the light." @default.
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- W2004402427 date "2008-12-15" @default.
- W2004402427 modified "2023-10-02" @default.
- W2004402427 title "Regulation of Fructose Transport and Its Effect on Fructose Toxicity in <i>Anabaena</i> spp" @default.
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- W2004402427 doi "https://doi.org/10.1128/jb.00886-08" @default.
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