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Updated: Apr 18, 2026
Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
Published on: August 28, 2012
Unfolded DapA forms aggregates when diluted into free solution, confounding comparison with folding by the
Andrew Ambrose1, Wayne Fenton2, Damian J Mason1
1College of Pharmacy, Department of Pharmacology and Toxicology, University of Arizona, Tucson, AZ 85721.
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.
