Natural chaperonin of the hyperthermophilic archaeum, Thermococcus strain KS-1: a hetero-oligomeric chaperonin with variable subunit composition |
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Authors: | Yoshida T Ideno A Hiyamuta S Yohda M Maruyama T |
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Institution: | Marine Biotechnology Institute Co. Ltd, Kamaishi Laboratories, 3-75-1 Heita, Kamaishi, Iwate 026-0001, Japan. |
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Abstract: | To study the difference in expression of the chaperonin alpha- and beta-subunits in Thermococcus strain KS-1 (T. KS-1), we measured their intracellular contents at various growth temperatures using subunit-specific antibodies. The beta-subunit was significantly more abundant with increasing temperature (maximum at 93 degrees C), whereas the alpha-subunit was not. Native PAGE with Western blot analysis indicated that the natural chaperonins in the crude extracts of T. KS-1 cells grown between 65 degrees C and 95 degrees C migrate as single bands with different mobility. The recombinant alpha- and beta-subunit homo-oligomers migrated differently from each other and from natural chaperonins. Immunoprecipitation also showed that the natural chaperonin was the hetero-oligomer. These results indicate that chaperonin in T. KS-1 formed a hetero-oligomer with variable subunit composition, and that the beta-subunit may be adapted to a higher temperature than the alpha-subunit. T. KS-1 probably changes its chaperonin subunit composition to acclimatize to the ambient temperature. |
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