Year: 1995
Type: article
Abstract: A 7 M aqueous urea solution of the 63-residue N-terminal domain of the 434-repressor at pH 7.5 and 18 degrees C contains a mixture of about 10% native, folded protein and 90% unfolded protein. Interconversion between the two conformations is slow on the NMR chemical shift time scale, so that observation of separate resonances can be used to monitor the equilibrium between folded and unfolded protein when changing the solution conditions. In this paper we describe the influence of various salts or non-ionic compounds on this conformational equilibrium. Solution conditions are described which contain a homogenous preparation of the folded protein in the presence of 6 to 7 M urea, providing a basis for an NMR structure determination in concentrated urea and for studies of the solvation of the folded protein in mixed water/urea/salt environments.
Source: FEBS Letters
Authors: V. Dötsch, G. Wider, G. Siegal, K. Wüthrich
Institutions: ETH Zurich, Institute of Molecular Biology and Biophysics
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2005281699