1. Decoding the Folding of Burkholderia glumae Lipase: Folding Intermediates En Route to Kinetic Stability
- Author
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Georges Feller, Kris Pauwels, Patrick Van Gelder, Manuel M. Sánchez del Pino, Structural Biology Brussels, and Department of Bio-engineering Sciences
- Subjects
Macromolecular Assemblies ,Protein Structure ,Protein Folding ,Burkholderia ,Protein Conformation ,Stereochemistry ,Biophysics ,lcsh:Medicine ,Biochemistry ,Protein Chemistry ,bacterial lipase ,molten globule ,Bacterial Proteins ,Native state ,Burkholderia glumae ,Lipase ,Protein Interactions ,lcsh:Science ,Biology ,Multidisciplinary ,biology ,lipase-specific foldase ,Physics ,lcsh:R ,Subtilisin ,Proteins ,biology.organism_classification ,Molten globule ,Enzymes ,Chaperone Proteins ,Kinetics ,Chaperone (protein) ,Enzyme Structure ,Proteolysis ,Foldase ,biology.protein ,lcsh:Q ,steric chaperone ,Protein folding ,near-native folding intermediate ,Research Article ,Molecular Chaperones - Abstract
The lipase produced by Burkholderia glumae folds spontaneously into an inactive near-native state and requires a periplasmic chaperone to reach its final active and secretion-competent fold. The B. glumae lipase-specific foldase (Lif) is classified as a member of the steric-chaperone family of which the propeptides of alpha-lytic protease and subtilisin are the best known representatives. Steric chaperones play a key role in conferring kinetic stability to proteins. However, until present there was no solid experimental evidence that Lif-dependent lipases are kinetically trapped enzymes. By combining thermal denaturation studies with proteolytic resistance experiments and the description of distinct folding intermediates, we demonstrate that the native lipase has a kinetically stable conformation. We show that a newly discovered molten globule-like conformation has distinct properties that clearly differ from those of the near-native intermediate state. The folding fingerprint of Lif-dependent lipases is put in the context of the protease-prodomain system and the comparison reveals clear differences that render the lipase-Lif systems unique. Limited proteolysis unveils structural differences between the near-native intermediate and the native conformation and sets the stage to shed light onto the nature of the kinetic barrier.
- Published
- 2012