1Q48

Solution NMR Structure of The Haemophilus Influenzae Iron-Sulfur Cluster Assembly Protein U (IscU) with Zinc Bound at the Active Site. Northeast Structural Genomics Consortium Target IR24. This protein is not apo, it is a model without zinc binding constraints.


SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents1 mM U-15N, U-13C IscU in 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3
Solvent95% H2O, 5% D2O
Ionic Strength20 mM MES, 100 mM NaCl, 5 mM CaCl2
pH6.5
Pressureambient
Temperature (K)293
Experiment(s):3D_15N-separated_NOESY, 3D_13C-separated_NOESY, HNHA
Sample Contents1 mM U-15N, U-13C IscU in 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3
Solvent100 % D2O
Ionic Strength20 mM MES, 100 mM NaCl, 5 mM CaCl2
pH6.5
Pressureambient
Temperature (K)293
Experiment(s):4D_13C-separated_NOESY
Sample Contents1 mM U-15N, U-5%-13C IscU in 20 mM MES, 100 mM NaCl, 5 mM CaCl2, 10 mM DTT, 0.02% NaN3
Solvent95% H2O, 5% D2O
Ionic Strength20 mM MES, 100 mM NaCl, 5 mM CaCl2
pH6.5
Pressureambient
Temperature (K)293
Experiment(s):13C_HSQC
Spectrometer Information
Manufacturer Model Field Strength
Varian UNITY 600.0
Varian INOVA 600.0
Varian INOVA 750.0
Varian INOVA 800.0
NMR Refinement
Method SIMULATED ANNEALING, TORSION ANGLE DYNAMICS, AUTOMATED ANALYSIS OF NOESY DATA AND 3D STRUCTURES
Details THE STRUCTURES ARE BASED ON A TOTAL OF 923 RESTRAINTS. SUMMARY OF EXPERIMENTAL CONSTRAINTS: DISTANCE CONSTRAINTS: TOTAL = 790; INTRA-RESIDUE [I=J] = 12; SEQUENTIAL [(I-J)=1] = 260; MEDIUM RANGE [1<(I-J)<5] = 185; LONG RANGE [(I-J)>=5] = 255; HYDROGEN BOND CONSTRAINTS = 58 (2 PER H-BOND); NUMBER OF DISTANCE CONSTRAINTS PER RESIDUE = 8.0; DIHEDRAL-ANGLE CONSTRAINTS = 133 (66 PHI, 67 PSI); TOTAL NUMBER OF CONSTRAINTS PER RESIDUE = 9.4 (RESIDES 26-123); NUMBER OF LONG RANGE CONSTRAINTS PER RESIDUE = 2.6; NUMBER OF STRUCTURES COMPUTED = 25; NUMBER OF STRUCTURES USED = 20. AVERAGE DISTANCE VIOLATIONS >0.0001 ANG = 24.3; AVERAGE R.M.S. DISTANCE VIOLATION = 0.003 ANG; MAXIMUM NUMBER OF DISTANCE VIOLATIONS 31. AVERAGE DIHEDRAL ANGLE VIOLATIONS: >0.0001 DEG = 1.0; MAX NUMBER OF DIHEDRAL ANGLE VIOLATIONS = 4; AVERAGE R.M.S. ANGLE VIOLATION = 0.01 DEG. RMSD VALUES: BACKBONE ATOMS (N,C,C',O) = 0.80 ANG; ALL HEAVY ATOMS = 1.17 ANG; PROCHECK: MOST FAVORED REGIONS = 77%; ADDITIONAL ALLOWED REGIONS = 20%; GENEROUSLY ALLOWED REGIONS = 3%; DISALLOWED REGIONS = 0%.
NMR Ensemble Information
Conformer Selection Criteria structures with the lowest energy
Conformers Calculated Total Number 25
Conformers Submitted Total Number 20
Representative Model Choice Rationale
1 lowest energy
Additional NMR Experimental Information
1 THE STRUCTURE WAS DETERMINED USING TRIPLE-RESONANCE NMR SPECTROSCOPY, AUTOMATED ANALYSIS OF 3D STRUCTURE.
Computation: NMR Software
# Classification Software Name Author
1 data analysis TALOS 1999.019.15.47 n/a
2 refinement AutoStructure Huang, Y.J., Montelione G.T.
3 refinement XPLOR XPLOR-NIH-2.0.6 SCHWIETERS, C.D., KUSZEWSKI, J.J. TJANDRA, N., CLORE, G.M.
4 data analysis Sparky 3.98 Goddard, T.D., Kneller, D.G.
5 structure solution X-PLOR Xplor-NIH-2.0.6 Schwieters, C.D., Kuszewski, J.J., Tjandra, N., Clore, G.M.
6 processing FELIX 98 MSI (Accelrys)