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NMR Solution Structure of a GCN5-like putative N-acetyltransferase from Staphylococcus aureus. Northeast Structural Genomics Consortium Target ZR31
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
3D_13C-separated_NOESY
1 mM protein U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 0.02% NaN3; 95% H2O, 5% D2O
95% H2O/5% D2O
.115
6.5
ambient
293
2
3D_15N-separated_NOESY
1 mM protein U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 0.02% NaN3; 95% H2O, 5% D2O
95% H2O/5% D2O
.115
6.5
ambient
293
3
HNHA
1 mM protein U-15N,13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 0.02% NaN3; 95% H2O, 5% D2O
95% H2O/5% D2O
.115
6.5
ambient
293
4
HNHB
0.4 mM protein U-15N,5%-13C; 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 0.02% NaN3; 95% H2O, 5% D2O
95% H2O/5% D2O
.115
6.5
ambient
293
5
4D_13C-separated_NOESY
1 mM protein U-15N,13C, 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 0.02% NaN3; 100% D2O
100% D2O
.115
6.5
ambient
293
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
600
2
Varian
INOVA
750
NMR Refinement
Method
Details
Software
automated generation of initial distance restraint set
distance geometry
simulated annealing
final refinement in explicit solvent
Backbone and sidechain assignments were determined manually from triple-resonance NMR data.
NOE distance restraints were derived automatically from peak-picked data with AutoStructure, then error-checked and corrected manually.
The structure is based on 848 restraints: 710 meaningful distance restraints, 58 hydrogen bond restraints, and 80 dihedral angle restraints.
There are 9.5 restraints per restrained residue.
Phi dihedral restraints were derived from the HNHA experiment and TALOS.
Psi dihedral restraints were derived from NOE ratios, secondary structure propensities evident in preliminary structures, alpha carbon chemical shifts, and TALOS.
Residues 44-51 comprise a poorly-defined loop in this ensemble of structures.
Residues 1-3 and 94-102 are unstructured termini.
AutoStructure
NMR Ensemble Information
Conformer Selection Criteria
structures with fewest restraint violations and lowest energy
Conformers Calculated Total Number
30
Conformers Submitted Total Number
20
Representative Model
1 (similarity to average, few violations, and low energy)
Additional NMR Experimental Information
Details
amide proton exchange was measured by dissolving a lyophilized protonated sample in D2O