Download MendeleyExpression, purification, characterization, and solution nuclear magnetic resonance study of highly deuterated yeast cytochrome C peroxidase with enhanced solubility.
Volkov, A.N., Wohlkonig, A., Soror, S.H., van Nuland, N.A.(2013) Biochemistry 52: 2165-2175
- PubMed: 23517193
- DOI: https://doi.org/10.1021/bi400220w
- Primary Citation of Related Structures:
4JB4 - PubMed Abstract:
Here we present the preparation, biophysical characterization, and nuclear magnetic resonance (NMR) spectroscopy study of yeast cytochrome c peroxidase (CcP) constructs with enhanced solubility. Using a high-yield Escherichia coli expression system, we routinely produced uniformly labeled [(2)H,(13)C,(15)N]CcP samples with high levels of deuterium incorporation (96-99%) and good yields (30-60 mg of pure protein from 1 L of bacterial culture). In addition to simplifying the purification procedure, introduction of a His tag at either protein terminus dramatically increases its solubility, allowing preparation of concentrated, stable CcP samples required for multidimensional NMR spectroscopy. Using a range of biophysical techniques and X-ray crystallography, we demonstrate that the engineered His tags neither perturb the structure of the enzyme nor alter the heme environment or its reactivity toward known ligands. The His-tagged CcP constructs remain catalytically active yet exhibit differences in the interaction with cytochrome c, the physiological binding partner, most likely because of steric occlusion of the high-affinity binding site by the C-terminal His tag. We show that protein perdeuteration greatly increases the quality of the double- and triple-resonance NMR spectra, allowing nearly complete backbone resonance assignments and subsequent study of the CcP by heteronuclear NMR spectroscopy.
Organizational Affiliation:
Jean Jeener NMR Centre, Structural Biology Brussels, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium. ovolkov@vub.ac.be
