Abstract
Synechocystis PCC 6803 cells could be induced to synthesize four major HSPs with apparent molecular sizes of 70, 64, 15 and 14 kDa. Heat stress at 42.5 °C appeared to be the optimum temperature for HSP formation in cells grown at 30 °C.
The relative rate of synthesis of HSP70 and HSP15 reached a maximum at 30 min after the temperature shift-up whereas the capability of cells to accumulate HSP64 and HSP14 continued through 2 h.
The two most abundant HSPs, HSP70 and HSP64, were recognized on western blots by antibodies raised against authentic DnaK and GroEL from Escherichia coli. To furnish sufficient evidence for the assumption that HSP64 is a GroEL-related chaperonin, this protein was purified to homogeneity. There was a 76% sequence identity between the amino acid sequence of HSP64 and the corresponding protein in Synechococcus PCC 7942. Moreover, the purified HSP64 cross-reacted to anti-E. coli GroEL antibody. To our knowledge, this is the first report about the purification and partial protein sequencing of a cyanobacterial chaperonin.
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Lehel, C., Wada, H., Kovács, E. et al. Heat shock protein synthesis of the cyanobacterium Synechocystis PCC 6803: purification of the GroEL-related chaperonin. Plant Mol Biol 18, 327–336 (1992). https://doi.org/10.1007/BF00034959
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DOI: https://doi.org/10.1007/BF00034959