Abstract
When a protein derived from the immunoglobulin G (IgG)-binding domains of staphylococcal protein A was expressed in Escherichia coli and recovered from cell extract by IgG affinity chromatography, the 69-kilodalton heat shock protein DnaK was found to be copurified. DnaK could be selectively eluted from the IgG column by ATP or by lowering the pH to 4.7. Protein A could subsequently be eluted by lowering the pH to 3.2. Thus, this procedure allows a one-step purification of both DnaK and protein A from cell extract. In vitro experiments with pure DnaK and protein A revealed that DnaK did not interfere with the IgG-binding properties of protein A but associated with its unfolded C-terminal in a salt-resistant manner. In addition, a specific interaction between DnaK and denaturated casein was found.
MeSH Terms
Binding Sites
Electrophoresis, Polyacrylamide Gel
Escherichia coli/genetics,metabolism
Escherichia coli Proteins
HSP70 Heat-Shock Proteins
Heat-Shock Proteins/isolation & purification,metabolism
Molecular Weight
Plasmids
Recombinant Proteins/isolation & purification,metabolism
Staphylococcal Protein A/isolation & purification,metabolism
Chemicals
Escherichia coli Proteins
HSP70 Heat-Shock Proteins
Heat-Shock Proteins
Recombinant Proteins
Staphylococcal Protein A
dnaK protein, E coli
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Hellebust H
Department of Biochemistry and Biotechnology, Royal Institute of Technology, Stockholm, Sweden.
Uhlén M
Enfors S O
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24 references, click to expand
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