The gene ssl3076 encodes a protein mediating the salt-induced expression of ggpS for the biosynthesis of the compatible solute glucosylglycerol in Synechocystis sp. strain PCC 6803.

Abstract:

:Acclimation to high salt concentrations involves concerted changes in gene expression. For the majority of salt-regulated genes, the mechanism underlying the induction process is not known. The gene ggpS (sll1566), which encodes the glucosylglycerol-phosphate synthase responsible for the synthesis of the compatible solute glucosylglycerol (GG), is specifically induced by salt in the cyanobacterial model strain Synechocystis sp. strain PCC 6803. To identify mechanisms mediating this salt-specific gene regulation, the ggpS promoter was analyzed in more detail. 5' rapid amplification of cDNA ends (5'-RACE) experiments revealed that the adjacent open reading frame (ORF), which is annotated as unknown protein Ssl3076, overlaps with the transcriptional start site of the ggpS gene. Reporter gene expression analyses indicated an essential role for the intact ssl3076 gene in the salt-regulated transcription of a gfp reporter gene. Promoter fragments containing a mutated ssl3076 lost the salt regulation; similarly, a frameshift mutation in ssl3076 resulted in a high level of ggpS expression under low-salt conditions, thereby establishing this small ORF, named ggpR, as a negative regulator of ggpS. Interestingly, small ORFs were also found adjacent to ggpS genes in the genomes of other GG-accumulating cyanobacteria. These results suggest that the GgpR protein represses ggpS expression under low-salt conditions, whereas in salt-shocked and salt-acclimated cells a stress-proportional ggpS expression occurs, leading to GG accumulation.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Klähn S,Höhne A,Simon E,Hagemann M

doi

10.1128/JB.00481-10

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

4403-12

issue

17

eissn

0021-9193

issn

1098-5530

pii

JB.00481-10

journal_volume

192

pub_type

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