Abstract
THE way in which proteins attain and maintain their final form is of fundamental importance. Recent work has focused on the role of a set of ubiquitous proteins, termed chaperonins1, in the assembly of phage2 and multisubunit proteins3,4. The range of chaperonin action is unknown; they could interact with most cellular polypeptides or have a limited subset of protein partners. Included in the chaperonin family is the essential heat-shock regulated Escherichia coli groEL gene product1, 5 ,6. Over-expression of the groE operon in E. coli causes enhanced assembly of heterologously expressed ribulose bisphosphate carboxylase subunits3 and suppresses the heat-sensitive mutant phenotype of several dnaA alleles7, 8. It has been inferred that suppression of heat-sensitive mutations is confined to dnaA alleles and that this confinement could reflect an interaction between the groE operon products and a dnaA protein aggregate at the replication origin7, 9. We now report that multiple copies of the groE operon suppress mutations in genes encoding several diverse proteins. Our data indicate a general role for the groE operon products, the GroEL and GroES proteins10, in the folding–assembly pathways of many proteins.
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Van Dyk, T., Gatenby, A. & LaRossa, R. Demonstration by genetic suppression of interaction of GroE products with many proteins. Nature 342, 451–453 (1989). https://doi.org/10.1038/342451a0
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DOI: https://doi.org/10.1038/342451a0
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