4JB4 image
Deposition Date 2013-02-19
Release Date 2013-04-10
Last Version Date 2023-09-20
Entry Detail
PDB ID:
4JB4
Keywords:
Title:
Expression, Purification, Characterization, and Solution NMR Study of Highly Deuterated Yeast Cytochrome c Peroxidase with Enhanced Solubility
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.39 Å
R-Value Free:
0.27
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cytochrome c peroxidase, mitochondrial
Gene (Uniprot):CCP1
Mutations:T1M, T2K, P3T
Chain IDs:A, B (auth: C)
Chain Length:300
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
Primary Citation
Expression, purification, characterization, and solution nuclear magnetic resonance study of highly deuterated yeast cytochrome C peroxidase with enhanced solubility.
Biochemistry 52 2165 2175 (2013)
PMID: 23517193 DOI: 10.1021/bi400220w

Abstact

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.

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