Stress Regulated DnaK Expression in Synechocystis sp. PCC 6803
In the cyanobacterium Synechocystis sp. PCC 6803 at least three DnaK proteins are functionally expressed, two of which (DnaK2 and DnaK3) are essential for cell viability. The Synechocystis DnaK2 protein shows the highest sequence similarity to Hsp70 proteins from other bacteria and chloroplasts. Therefore, this protein has been suggested to have a privileged function in vivo. We show here that the expression of dnaK2 alters most significantly when Synechocystis cells are grown under different cellular stresses. Furthermore, the expression of dnaK3 also varies at certain stress conditions.
KeywordsCyanobacteria DnaK stress promoter activity Synechocystis
Unable to display preview. Download preview PDF.