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J. Bacteriol., Mar 1997, 1727-1733, Vol 179, No. 5
Copyright © 1997, American Society for Microbiology

The stpA gene form synechocystis sp. strain PCC 6803 encodes the glucosylglycerol-phosphate phosphatase involved in cyanobacterial osmotic response to salt shock

M Hagemann, A Schoor, R Jeanjean, E Zuther and F Joset
Universitat Rostock, FB Biologie, Germany. mh@boserv.bio4.unirostock.de

Mutations in a gene, stpA, had been correlated with the loss of tolerance to high NaCl concentrations in the cyanobacterium Synechocystis sp. strain PCC 6803. Genetic, biochemical, and physiological evidence shows that stpA encodes glucosylglycerol- phosphate phosphatase. stpA mutants are salt sensitive and accumulate glucosylglycerol-phosphate, the precursor of the osmoprotectant glucosylglycerol necessary for salt adaptation of Synechocystis. The consensus motif present in acid phosphatases was found in StpA; however, the homology with other sugar phosphatases is very poor. The amount of stpA mRNA was increased by growth of the cells in the presence of NaCl concentrations above 170 mM. Expression of stpA in Escherichia coli allowed the production of a 46-kDa protein which exhibited glucosylglycerol-phosphate phosphatase activity. The StpA- specific antibody revealed a protein of similar size in extracts of Synechiocystis, and the amount of this protein was increased in salt- adapted cells. The protein produced in E. coli had lost the requirement for activation by NaCl that was observed for the genuine cyanobacterial enzyme.


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