Purification and characterization of the 16-kda heat-shock-responsive protein from the thermophilic cyanobacterium Synechococcus vulcanus, which is an α-crystallin-related, small heat shock protein

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Abstract

A 16-kDa protein, one of the major proteins that accumulates upon heat- shock treatment in the thermophilic cyanobacterium Synechococcus vulcanus, was purified to apparent homogeneity. The N-terminal and internal amino acid sequences of the protein exhibited a homology to the α-crystallin-related, small heat shock proteins from other organisms. The protein was designated HspA. Size-exclusion chromatography and nondenaturing gel electrophoresis demonstrated that HspA formed a large homo-oligomer consisting of 24 subunits. It prevented the aggregation of porcine malic dehydrogenase at 45 °C and 50 °C and citrate synthase at 50 °C. The activity of the malic dehydrogenase, however, was not protected under these heat-shock conditions or reactivated after a shift in temperature from 45 or 50 °C to 21 °C. HspA was able to enhance the refolding of chemically denatured rabbit muscle lactate dehydrogenase in an ATP-independent manner. A homologue to the 16- kDa protein was also found to be induced upon heat-shock treatment in the mesophilic cyanobacterium Synechocystis sp. PCC 6803.

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Roy, S. K., Hiyama, T., & Nakamoto, H. (1999). Purification and characterization of the 16-kda heat-shock-responsive protein from the thermophilic cyanobacterium Synechococcus vulcanus, which is an α-crystallin-related, small heat shock protein. European Journal of Biochemistry, 262(2), 406–416. https://doi.org/10.1046/j.1432-1327.1999.00380.x

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