title: Characterization of folding the four-helix bundle protein Rop by real-time NMR.
abstract: Rop is a four-helix bundle protein composed of two identical helix-loop-helix monomers. Protein folding monitored by stopped-flow fluorescence or CD exhibits biphasic kinetics when folding to low final denaturant concentrations. As the final concentration of denaturant is increased, the amplitude of the fast phase decreases, until at the highest concentrations the kinetics appear monophasic. We propose that the fast phase represents the formation of an intermediate. Here, we use real-time NMR to detect the formation of this intermediate and to characterize its structural features.
authors.affiliation: Department of Physical Chemistry and Institute of Biotechnology, University of Granada, 18071 Granada, Spain.
authors.forename: Nico A J
authors.initials: NA
authors.lastname: van Nuland
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Dobson
authors.forename: Lynne
authors.initials: L
authors.lastname: Regan
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D002942:Circular Dichroism; D019791:Guanidine / Q000494:pharmacology; D007700:Kinetics; D008958:Models, Molecular; D019906:Nuclear Magnetic Resonance, Biomolecular; D011487:Protein Conformation; D017510:Protein Folding; D016601:RNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D016601:RNA-Binding Proteins; C054243:Rop protein, ColE1 plasmid; D019791:Guanidine