An NMR view of the folding process of a CheY mutant at the residue level.
 

An NMR view of the folding process of a CheY mutant at the residue level.

Related Articles An NMR view of the folding process of a CheY mutant at the residue level.

Structure. 2002 Sep;10(9):1173-1185

Authors: Garcia P, Serrano L, Rico M, Bruix M

The folding of CheY mutant F14N/V83T was studied at 75 residues by NMR. Fluorescence, NMR, and sedimentation equilibrium studies at different urea and protein concentrations reveal that the urea-induced unfolding of this CheY mutant includes an on-pathway molten globule-like intermediate that can associate off-pathway. The populations of native and denatured forms have been quantified from a series of 15N-1H HSQC spectra recorded under increasing concentrations of urea. A thermodynamic analysis of these data provides a detailed picture of the mutant's unfolding at the residue level: (1) the transition from the native state to the molten globule-like intermediate is highly cooperative, and (2) the unfolding of this state is sequential and yields another intermediate showing a collapsed N-terminal domain and an unfolded C-terminal tail. This state presents a striking similarity to the kinetic transition state of the CheY folding pathway.

PMID: 12220489 [PubMed - indexed for MEDLINE]



Source: PubMed