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SOLUTION STRUCTURE OF OXIDIZED PARAMAGNETIC CU(II) PLASTOCYANIN FROM SYNECHOCYSTIS PCC6803
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
3 mM plastocyanin U-15N 50 mM phosphate buffer
90% H2O/10% D2O
50 mM phosphate
5.2
ambient
295
2
HNHA
3 mM plastocyanin U-15N 50 mM phosphate buffer
90% H2O/10% D2O
50 mM phosphate
5.2
ambient
295
3
NOE
3 mM plastocyanin U-15N 50 mM phosphate buffer
90% H2O/10% D2O
50 mM phosphate
5.2
ambient
295
4
proton T1 (HSQC)
3 mM plastocyanin U-15N 50 mM phosphate buffer
90% H2O/10% D2O
50 mM phosphate
5.2
ambient
295
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
AVANCE
600
2
Bruker
AVANCE
800
NMR Refinement
Method
Details
Software
torsion angle dynamics
The protein contains paramagnetic copper(II), whose electronic relaxation times are quite unfavorable for NMR solution studies. The structure has been solved on the basis of 1041 meaningful NOESY cross peaks, 18 1D NOEs, 26 T1 values, 96 dihedral angle constraints and 18 H-bonds. The detection of broad hyperfine shifted signals and their full assignment allowed the identification of the copper(II) ligands and the determination of the Cu-S-C-H dihedral angle for the coordinated cysteine. The global root mean square deviation from the mean structure for the solution structure family is 0.72 and 1.16 for backbone and heavy atoms, respectively.