NDLI: Sucrose synthase in unicellular cyanobacteria and its relationship with salt and hypoxic stress

Content Provider	Springer Nature Link
Author	Kolman, María A. Torres, Leticia L. Martin, Mariana L. Saler, Graciela L.
Copyright Year	2011
Abstract	Higher plants and cyanobacteria metabolize sucrose (Suc) by a similar set of enzymes. Suc synthase (SuS, A/UDP-glucose: d-fructose 2-α-d-glucosyl transferase) catalyzes a reversible reaction. However, it is in the cleavage of Suc that this enzyme plays an important role in vivo, providing sugar nucleotides for polysaccharide biosynthesis. In cyanobacteria, SuS occurrence has been reported in heterocyst-forming strains, where it was shown to be involved also in nitrogen fixation. We investigated the presence of sequences homologous to SuS-encoding genes (sus) in recently sequenced cyanobacterial genomes. In this work, we show for the first time the presence of SuS in unicellular cyanobacterium strains (Microcystis aeruginosa PCC 7806, Gloebacter violaceus PCC 7421, and Thermosynechococcus elongatus BP-1). After functional characterization of SuS encoding genes, we demonstrated an increase in their transcript levels after a salt treatment or hypoxic stress in M. aeruginosa and G. violaceus cells. Based on phylogenetic analysis and on the presence of sus homologs in the most recently radiated cyanobacterium strains, we propose that sus genes in unicellular cyanobacteria may have been acquired through horizontal gene transfer. Taken together, our data indicate that SuS acquisition by cyanobacteria might be related to open up new ecological niches.
Starting Page	955
Ending Page	964
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	235
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-24
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gloeobacter violaceus Hypoxia Microcystis aeruginosa Salt stress Sucrose metabolism Thermosynechococcus elongatus Ecology Plant Sciences Forestry Agriculture
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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