A mutant at position 87 of the GroEL chaperonin is affected in protein binding and ATP hydrolysis

Celeste Weiss, Pierre Goloubinoff*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The highly conserved aspartic acid residue at position 87 of the Escherichia coli chaperonin GroEL was mutated to glutamic acid. When expressed in an E. coli groEL mutant strain deficient for phage morphogenesis, plasmid-encoded GroEL mutant D87E restored T4 phage morphogenesis. It did not, however, reactivate the transcription of a recombinant luciferase operon from Vibrio fischeri. In vitro, GroEL mutant D87E was found to be impaired in the ability to bind nonnative proteins and to hydrolyze ATP, resulting in less efficient refolding of urea-denatured ribulose-1,5-bisphosphate carboxylase/oxygenase. Mutant oligomer D87E GroEL14 was able to bind GroES7 as efficiently as wild-type GroEL14. The conserved aspartic acid residue at position 87 located in the equatorial domain of GroEL (Braig, K., Otwinowski, Z., Hegde, R., Boisvert, D. C., Joachimiak, A., Horwich, A. L., and Sigler, P. B. (1994) Nature 371, 578- 586) is thus inferred to have a dual effect on the binding of nonnative proteins to the GroEL14 core chaperonin and on ATP hydrolysis.

Original languageEnglish
Pages (from-to)13956-13960
Number of pages5
JournalJournal of Biological Chemistry
Volume270
Issue number23
DOIs
StatePublished - 9 Jun 1995
Externally publishedYes

Fingerprint

Dive into the research topics of 'A mutant at position 87 of the GroEL chaperonin is affected in protein binding and ATP hydrolysis'. Together they form a unique fingerprint.

Cite this