Protein disaggregation mediated by heat-shock protein Hsp104

The heat-inducible members of the Hsp100 (or Clp) family of proteins share a common function in helping organisms to survive extreme stress, but the basic mechanism through which these proteins function is not understood. Hsp104 protects cells against a variety of stresses, under many physiological...

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Bibliographic Details
Published in:Nature (London) 1994-12, Vol.372 (6505), p.475-478
Main Authors: PARSELL, D. A, KOWAK, A. S, SINGER, M. A, LINDQUIST, S
Format: Article
Language:English
Subjects:
Aggregates
Analytical, structural and metabolic biochemistry
Arabidopsis thaliana
Biological and medical sciences
Cellular biology
E coli
Fundamental and applied biological sciences. Psychology
Heat
Heat-Shock Proteins - physiology
Hot Temperature
HSP70 Heat-Shock Proteins - physiology
Luciferases - metabolism
Miscellaneous
Molecular biophysics
Molecular Chaperones - physiology
Mutation
Protein Denaturation
Proteins
Recombinant Fusion Proteins - metabolism
Saccharomyces cerevisiae
Saccharomyces cerevisiae Proteins
Solubility
Stress
Structure in molecular biology
Tridimensional structure
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Summary:The heat-inducible members of the Hsp100 (or Clp) family of proteins share a common function in helping organisms to survive extreme stress, but the basic mechanism through which these proteins function is not understood. Hsp104 protects cells against a variety of stresses, under many physiological conditions, and its function has been evolutionarily conserved, at least from Saccharomyces cerevisiae to Arabidopsis thaliana. Homology with the Escherichia coli ClpA protein suggests that Hsp104 may provide stress tolerance by helping to rid the cell of heat-denatured proteins through proteolysis. But genetic analysis indicates that Hsp104 may function like Hsp70 as a molecular chaperone. Here we investigate the role of Hsp104 in vivo using a temperature-sensitive Vibrio harveyi luciferase-fusion protein as a test substrate. We find that Hsp104 does not protect luciferase from thermal denaturation, nor does it promote proteolysis of luciferase. Rather, Hsp104 functions in a manner not previously described for other heat-shock proteins: it mediates the resolubilization of heat-inactivated luciferase from insoluble aggregates.
ISSN:0028-0836
1476-4687
DOI:10.1038/372475a0