Unfolded DapA forms aggregates when diluted into free solution, confounding comparison with folding by the GroEL/GroES chaperonin system

Andrew J. Ambrose, Wayne Fenton, Damian J. Mason, Eli Chapman, Arthur L. Horwich

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

A recent hydrogen-deuterium exchange study of folding of the GroEL/GroES-dependent bacterial enzyme DapA has suggested that the DapA folding pathway when free in solution may differ from the folding pathway used in the presence of the GroEL/GroES chaperonin. Here, we have investigated whether DapA aggregation might be occurring in free solution under the conditions of the exchange experiment, as this would confound interpretation of the pathway predictions. Dynamic light scattering (DLS) data, sedimentation analysis and refolding yield indicate that significant aggregation occurs upon dilution of DapA from denaturant, bringing into question the earlier conclusion that different folding pathways occur in the absence and presence of the chaperonin system.

Original languageEnglish (US)
Pages (from-to)497-499
Number of pages3
JournalFEBS Letters
Volume589
Issue number4
DOIs
StatePublished - Feb 13 2015

Keywords

  • Aggregation
  • DapA
  • GroEL
  • Light scattering
  • Protein folding

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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