SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents1.2mM Stefin A U-15N; 50mM phosphate buffer pH 5.5, 100mM KCl, 5mM Azide; 90% H2O, 10% D2O
Solvent90% H2O, 10% D2O
Ionic Strengthn/a
pH5.5
Pressureambient
Temperature (K)308
Experiment(s):HNCA, HNCO, HN(CA)CB, TOCSY-HSQC, NOESY-HSQC
Sample Contents1mM Stefin A U-15N,13C,2H; 50mM phosphate buffer pH 5.5, 100mM KCl, 5mM Azide; 90% H2O, 10% D2O
Solvent90% H2O, 10% D2O
Ionic Strengthn/a
pH5.5
Pressureambient
Temperature (K)308
Experiment(s):15N-isotope-filtered NOESY
Spectrometer Information
Manufacturer Model Field Strength
Bruker DRX 800.0
Bruker DRX 600.0
NMR Refinement
Method simulated annealing
Details Distance restraints (NOEs and hydrogen bonds) were taken from the data used for the stefin A monomer structure (Martin et al., 1995), except those involving residues V48-G50 and N77-L80 where chemical shift perturbation was observed following resonance assignment. The NOEs were specified as intermolecular and intramolecular according to domain-swapped topology inferred from isotope filtering experiments. An additional hydrogen bond restraint was included between 48 and 50 based on evidence from protection experiments on the dimer (Jerala and Zerovnik, 1999). Dihedral restraints (phi and psi) were determined using the 1H-alpha, 15N, 13C-alpha, 13C-beta and 13C' chemical shifts and the program TALOS (Cornilescu et al., 1999). Where TALOS gave a `poor' match, the experimental phi dihedral angle was taken from the data used for the stefin A monomer structure calculation.
NMR Ensemble Information
Conformers Submitted Total Number 1
Representative Model Choice Rationale
1 minimized average structure
Computation: NMR Software
# Classification Software Name Author
1 refinement X-PLOR 3.1 BRUNGER
2 data analysis FELIX 2000 MSI
3 collection XWINNMR 2.6 Bruker