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J Biol Chem, Vol. 274, Issue 40, 28083-28086, October 1, 1999

COMMUNICATION
ClpB Cooperates with DnaK, DnaJ, and GrpE in Suppressing Protein Aggregation
A NOVEL MULTI-CHAPERONE SYSTEM FROM ESCHERICHIA COLI

Michal Zolkiewski

From the Department of Biochemistry, Kansas State University, Manhattan, Kansas 66506

ClpB is a heat-shock protein from Escherichia coli with an unknown function. We studied a possible molecular chaperone activity of ClpB in vitro. Firefly luciferase was denatured in urea and then diluted into the refolding buffer (in the presence of 5 mM ATP and 0.1 mg/ml bovine serum albumin). Spontaneous reactivation of luciferase was very weak (less than 0.02% of the native activity) because of extensive aggregation. Conventional chaperone systems (GroEL/GroES and DnaK/DnaJ/GrpE) or ClpB alone did not reactivate luciferase under those conditions. However, ClpB together with DnaK/DnaJ/GrpE greatly enhanced the luciferase activity regain (up to 57% of native activity) by suppressing luciferase aggregation. This coordinated function of ClpB and DnaK/DnaJ/GrpE required ATP hydrolysis, although the ClpB ATPase was not activated by native or denatured luciferase. When the chaperones were added to the luciferase refolding solutions after 5-25 min of refolding, ClpB and DnaK/DnaJ/GrpE recovered the luciferase activity from preformed aggregates. Thus, we have identified a novel multi-chaperone system from E. coli, which is analogous to the Hsp104/Ssa1/Ydj1 system from yeast. ClpB is the only known bacterial Hsp100 protein capable of cooperating with other heat-shock proteins in suppressing and reversing protein aggregation.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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