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. 1987 Dec;7(12):4414–4423. doi: 10.1128/mcb.7.12.4414

A normal mitochondrial protein is selectively synthesized and accumulated during heat shock in Tetrahymena thermophila.

T W McMullin 1, R L Hallberg 1
PMCID: PMC368125  PMID: 3325824

Abstract

We have identified and purified a 58-kilodalton protein of Tetrahymena thermophila whose synthesis during heat shock parallels that of the major heat shock proteins. This protein, hsp58, was found in both non-heat-shocked as well as heat-shocked cells; however, its concentration in the cell increased approximately two- to threefold during heat shock. The majority of hsp58 in both non-heat-shocked and heat-shocked cells was found by both cell fractionation studies and immunocytochemical techniques to be mitochondrially associated. During heat shock, the additional hsp58 was found to selectively accumulate in mitochondria. Nondenatured hsp58 released from mitochondria of non-heat-shocked or heat-shocked cells sedimented in sucrose gradients as a 20S to 25S complex. We suggest that this protein may play a role in mitochondria analogous to the role the major heat shock proteins play in the nucleus and cytosol.

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Selected References

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