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The solution structure and backbone dynamics of Cu(I) pseudoazurin, a 123 amino acid electron transfer protein from Paracoccus pantotrophus, have been determined using NMR methods. The structure was calculated to high precision, with a backbone RMS deviation for secondary structure elements of 0.35+/-0.06 A, using 1,498 distance and 55 torsion angle constraints. The protein has a double-wound Greek-key fold with two alpha-helices toward its C-terminus, similar to that of its oxidized counterpart determined by X-ray crystallography. Comparison of the Cu(I) solution structure with the X-ray structure of the Cu(II) protein shows only small differences in the positions of some of the secondary structure elements. Order parameters S2, measured for amide nitrogens, indicate that the backbone of the protein is rigid on the picosecond to nanosecond timescale.

Original publication

DOI

10.1110/ps.9.5.846

Type

Journal article

Journal

Protein Sci

Publication Date

05/2000

Volume

9

Pages

846 - 858

Keywords

Amides, Amino Acid Sequence, Azurin, Computer Simulation, Copper, Crystallography, X-Ray, Hydrogen-Ion Concentration, Kinetics, Magnetic Resonance Spectroscopy, Models, Molecular, Molecular Sequence Data, Nitrogen, Paracoccus, Protein Structure, Secondary, Temperature