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. 1989 Nov;8(11):3517–3521. doi: 10.1002/j.1460-2075.1989.tb08517.x

Effects of mutations in heat-shock genes groES and groEL on protein export in Escherichia coli.

N Kusukawa 1, T Yura 1, C Ueguchi 1, Y Akiyama 1, K Ito 1
PMCID: PMC401509  PMID: 2573517

Abstract

Escherichia coli heat-shock proteins GroES and GroEL are essential cytoplasmic proteins, which have been termed 'chaperonins' because of their ability to assist protein assembly of bacteriophage capsids and multimeric enzymes of foreign origin. In this report we show that temperature-sensitive mutations in groES and groEL genes cause defective export of the plasmid-encoded beta-lactamase (Bla) in vivo. Since efficient translocation of proteins across biological membranes is thought to be supported by cytoplasmic factors that protect presecretory molecules from being misfolded, these results suggest that both GroES and GroEL proteins possess a chaperone function by which they facilitate export of Bla. The translocation of other secretory proteins, however, appears to depend minimally on GroE, suggesting that GroE interacts only with a specific class of secreted proteins.

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Selected References

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